{"id":1891,"date":"2026-04-09T03:21:45","date_gmt":"2026-04-09T03:21:45","guid":{"rendered":"https:\/\/wormwheelgear.top\/?p=1891"},"modified":"2026-04-09T03:21:45","modified_gmt":"2026-04-09T03:21:45","slug":"worm-gear-failure-diagnosis-five-modes-how-to-tell-them-apart-and-what-each-means-for-your-specification","status":"publish","type":"post","link":"https:\/\/wormwheelgear.top\/fr\/worm-gear-failure-diagnosis-five-modes-how-to-tell-them-apart-and-what-each-means-for-your-specification\/","title":{"rendered":"Diagnostic des d\u00e9faillances des engrenages \u00e0 vis sans fin\u00a0\u2014 Cinq modes, comment les distinguer et leurs implications pour vos sp\u00e9cifications"},"content":{"rendered":"<section style=\"background: linear-gradient(150deg,#1c0808 0%,#3a0f0f 55%,#1c0808 100%); min-height: 400px; display: flex; align-items: center; position: relative; overflow: hidden;\">\n<div style=\"position: absolute; right: 0; top: -20px; font-size: 360px; font-weight: 900; color: rgba(255,255,255,.03); pointer-events: none; font-family: Georgia,serif; line-height: 1;\">!<\/div>\n<div style=\"position: relative; z-index: 2; padding: 56px 20px; max-width: 1100px; margin: 0 auto; width: 100%; box-sizing: border-box;\">\n<p style=\"font-size: 11px; font-weight: bold; letter-spacing: 3px; text-transform: uppercase; color: rgba(255,160,120,.6); margin: 0 0 14px;\">S\u00e9rie de connaissances \u00b7 Principes fondamentaux des engrenages \u00e0 vis sans fin<\/p>\n<h1 style=\"font-size: clamp(24px,4.5vw,46px); font-weight: 900; color: #fff; line-height: 1.12; margin: 0 0 16px; max-width: 760px;\">Engrenage \u00e0 vis sans fin <span style=\"color: #ff8060;\">Diagnostic de d\u00e9faillance<\/span> \u2014 Cinq modes\u00a0: comment les distinguer et ce que chacun signifie pour vos sp\u00e9cifications<\/h1>\n<p style=\"font-size: clamp(14px,1.8vw,17px); color: rgba(255,255,255,.70); max-width: 640px; line-height: 1.7; margin: 0 0 24px;\">Une roue \u00e0 vis sans fin us\u00e9e en trois mois et une autre ayant dur\u00e9 cinq ans peuvent para\u00eetre presque identiques au premier abord. La diff\u00e9rence r\u00e9side dans le mode de d\u00e9faillance, qui r\u00e9v\u00e8le pr\u00e9cis\u00e9ment l'erreur commise dans le cahier des charges.<\/p>\n<div style=\"display: flex; flex-wrap: wrap; gap: 10px;\"><span style=\"background: rgba(255,80,60,.15); border: 1px solid rgba(255,80,60,.3); border-radius: 22px; padding: 7px 14px; font-size: 12px; font-weight: bold; color: rgba(255,200,180,.9);\">\u2460 Usure abrasive<\/span><br \/>\n<span style=\"background: rgba(255,80,60,.15); border: 1px solid rgba(255,80,60,.3); border-radius: 22px; padding: 7px 14px; font-size: 12px; font-weight: bold; color: rgba(255,200,180,.9);\">\u2461 \u00c9raflures adh\u00e9sives<\/span><br \/>\n<span style=\"background: rgba(255,80,60,.15); border: 1px solid rgba(255,80,60,.3); border-radius: 22px; padding: 7px 14px; font-size: 12px; font-weight: bold; color: rgba(255,200,180,.9);\">\u2462 Fatigue par piq\u00fbres<\/span><br \/>\n<span style=\"background: rgba(255,80,60,.15); border: 1px solid rgba(255,80,60,.3); border-radius: 22px; padding: 7px 14px; font-size: 12px; font-weight: bold; color: rgba(255,200,180,.9);\">\u2463 Fracture dentaire<\/span><br \/>\n<span style=\"background: rgba(255,80,60,.15); border: 1px solid rgba(255,80,60,.3); border-radius: 22px; padding: 7px 14px; font-size: 12px; font-weight: bold; color: rgba(255,200,180,.9);\">\u2464 Usure corrosive<\/span><\/div>\n<\/div>\n<\/section>\n<div style=\"margin: 0 auto; padding: 0 5%; box-sizing: border-box; padding-top: 8px;\">\n<h2 style=\"font-size: clamp(20px,2.8vw,30px); font-weight: 800; color: #1c0808; margin: 48px 0 14px; line-height: 1.22;\">Pourquoi les d\u00e9faillances des engrenages \u00e0 vis sans fin sont diff\u00e9rentes<\/h2>\n<p style=\"margin-bottom: 16px; font-size: 15px; color: #2c3e50; line-height: 1.82;\">Les engrenages \u00e0 vis sans fin pr\u00e9sentent des d\u00e9faillances diff\u00e9rentes des autres types d'engrenages, et cette diff\u00e9rence est cruciale pour le diagnostic. Dans un engrenage \u00e0 vis sans fin, l'asym\u00e9trie fondamentale de l'engr\u00e8nement cr\u00e9e une hi\u00e9rarchie de d\u00e9faillances\u00a0: presque tous les modes de d\u00e9faillance se manifestent principalement, voire exclusivement, sur le flanc de la dent de la roue dent\u00e9e, et non sur le filetage de l'arbre.<\/p>\n<p style=\"margin-bottom: 16px; font-size: 15px; color: #2c3e50; line-height: 1.82;\">La raison r\u00e9side dans la m\u00e9canique du contact glissant. Le filet de la vis sans fin glisse sur toute la largeur de la dent de la roue \u00e0 chaque tour\u00a0; la distance de glissement par tour au niveau de l'engr\u00e8nement est bien sup\u00e9rieure \u00e0 celle de n'importe quel engrenage h\u00e9lico\u00efdal \u00e0 rapport \u00e9quivalent. Dans un engrenage correctement appari\u00e9, l'usure de la dent est lente et contr\u00f4l\u00e9e. En cas de mat\u00e9riau ou de lubrification inad\u00e9quats, le contact glissant devient un m\u00e9canisme d'adh\u00e9rence ou d'abrasion produisant un sch\u00e9ma d'endommagement sp\u00e9cifique et identifiable. La premi\u00e8re \u00e9tape pour r\u00e9diger un cahier des charges corrig\u00e9 est d'interpr\u00e9ter correctement ce sch\u00e9ma.<\/p>\n<div style=\"border-left: 4px solid #c9892a; background: #fdf6ec; padding: 18px 22px; margin: 28px 0; border-radius: 0 6px 6px 0;\">\n<p style=\"margin: 0; font-size: 14px; color: #5a3e10; line-height: 1.72;\"><strong style=\"color: #7a4f0a;\">Avant de d\u00e9monter un engrenage d\u00e9fectueux, notez\u00a0:<\/strong> (1) La couleur de l'huile et toute odeur m\u00e9tallique provenant du bouchon de vidange\u00a0; (2) la temp\u00e9rature du carter \u00e0 l'arr\u00eat\u00a0; (3) l'historique de fonctionnement (continu ou intermittent, toute charge ou tout \u00e9v\u00e9nement inhabituel)\u00a0; (4) le d\u00e9lai entre l'installation et la panne. Ces quatre points de donn\u00e9es permettent souvent de restreindre le risque de panne \u00e0 un ou deux facteurs avant m\u00eame d'avoir examin\u00e9 les flancs des dents.<\/p>\n<\/div>\n<hr style=\"border: none; border-top: 2px solid #f0e0d8; margin: 48px 0;\" \/>\n<h2 style=\"font-size: clamp(20px,2.8vw,30px); font-weight: 800; color: #1c0808; margin: 48px 0 14px; line-height: 1.22;\">Cinq modes de d\u00e9faillance \u2014 Identification, cause et solution<\/h2>\n<div style=\"border-radius: 12px; overflow: hidden; margin: 36px 0; box-shadow: 0 4px 20px rgba(28,8,8,.12);\">\n<div style=\"display: flex; flex-wrap: wrap; align-items: center; gap: 16px; padding: 18px 22px; background: #fff8f5; border-bottom: 2px solid #e08060;\">\n<div style=\"min-width: 50px; height: 50px; border-radius: 50%; background: #c05030; color: #fff; font-size: 20px; font-weight: 900; display: flex; align-items: center; justify-content: center; flex-shrink: 0;\">1<\/div>\n<div style=\"flex: 1; min-width: 0;\">\n<div style=\"font-size: 10px; font-weight: bold; letter-spacing: 2px; text-transform: uppercase; color: #c05030; margin-bottom: 4px;\">Mode de d\u00e9faillance 01<\/div>\n<div style=\"font-size: 17px; font-weight: 800; color: #1c0808; line-height: 1.2;\">Usure abrasive \u2014 L'\u00e9rosion lente<\/div>\n<\/div>\n<div style=\"font-size: 11px; font-weight: bold; border-radius: 8px; padding: 4px 12px; background: #fff8f5; color: #c05030; border: 1px solid #e08060; white-space: nowrap;\">Progressif \u00b7 Contr\u00f4lable<\/div>\n<\/div>\n<div style=\"background: #fff; padding: 22px 20px;\">\n<div style=\"display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 18px;\">\n<div style=\"flex: 1 1 200px; min-width: 180px;\">\n<div style=\"font-size: 10px; font-weight: bold; letter-spacing: 2px; text-transform: uppercase; color: #888; margin-bottom: 10px; padding-bottom: 6px; border-bottom: 1px solid #f0e0d8;\">\ud83d\udc41 Ce que vous voyez<\/div>\n<ul style=\"list-style: none; margin: 0; padding: 0;\">\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #5a6b7d; flex-shrink: 0; margin-top: 2px;\">\ud83d\udc41<\/span>\u00c9limination uniforme de la mati\u00e8re sur le flanc de la dent \u2014 et non al\u00e9atoire<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #5a6b7d; flex-shrink: 0; margin-top: 2px;\">\ud83d\udc41<\/span>Fines rainures ou rayures parall\u00e8les \u00e0 la direction de glissement (direction du profil de la dent)<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #5a6b7d; flex-shrink: 0; margin-top: 2px;\">\ud83d\udc41<\/span>Texture de surface lisse et mate \u2014 sans ar\u00eates vives ni formations crat\u00e9riques<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #5a6b7d; flex-shrink: 0; margin-top: 2px;\">\ud83d\udc41<\/span>Poudre gris\/brun m\u00e9tallique dans l'huile \u00e9goutt\u00e9e<\/li>\n<\/ul>\n<\/div>\n<div style=\"flex: 1 1 200px; min-width: 180px;\">\n<div style=\"font-size: 10px; font-weight: bold; letter-spacing: 2px; text-transform: uppercase; color: #888; margin-bottom: 10px; padding-bottom: 6px; border-bottom: 1px solid #f0e0d8;\">\u26a0 Causes profondes<\/div>\n<ul style=\"list-style: none; margin: 0; padding: 0;\">\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #c05030; flex-shrink: 0; margin-top: 2px;\">\u26a0<\/span>Particules contaminantes dures dans le lubrifiant (d\u00e9bris m\u00e9talliques, sable de fonderie, particules abrasives externes)<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #c05030; flex-shrink: 0; margin-top: 2px;\">\u26a0<\/span>Diff\u00e9rence de duret\u00e9 insuffisante \u2014 les mat\u00e9riaux de l'arbre et de la roue ont une duret\u00e9 trop proche.<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #c05030; flex-shrink: 0; margin-top: 2px;\">\u26a0<\/span>Les r\u00e9sidus de rodage non \u00e9limin\u00e9s lors de la premi\u00e8re vidange d'huile<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #c05030; flex-shrink: 0; margin-top: 2px;\">\u26a0<\/span>Viscosit\u00e9 du lubrifiant trop faible \u2014 \u00e9paisseur de film insuffisante<\/li>\n<\/ul>\n<\/div>\n<div style=\"flex: 1 1 200px; min-width: 180px;\">\n<div style=\"font-size: 10px; font-weight: bold; letter-spacing: 2px; text-transform: uppercase; color: #888; margin-bottom: 10px; padding-bottom: 6px; border-bottom: 1px solid #f0e0d8;\">\u2713 Solution de sp\u00e9cification<\/div>\n<ul style=\"list-style: none; margin: 0; padding: 0;\">\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #27ae60; flex-shrink: 0; margin-top: 2px;\">\u2713<\/span>Inspecter et remplacer le joint d'arbre\u00a0; installer le bouchon de remplissage d'huile avec filtre de reniflard<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #27ae60; flex-shrink: 0; margin-top: 2px;\">\u2713<\/span>Changez l'huile 50 \u00e0 100 heures apr\u00e8s l'installation\u00a0\u2014 ne sautez pas cette \u00e9tape.<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #27ae60; flex-shrink: 0; margin-top: 2px;\">\u2713<\/span>V\u00e9rifiez la duret\u00e9 de l'arbre par des essais, et non en vous basant uniquement sur la fiche technique.<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #27ae60; flex-shrink: 0; margin-top: 2px;\">\u2713<\/span>Passez au niveau de duret\u00e9 d'arbre sup\u00e9rieur si le diff\u00e9rentiel est insuffisant<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div style=\"background: #f8f5f0; border-radius: 8px; padding: 14px 16px; font-size: 13px; color: #5a3020; border-left: 3px solid #c9892a; line-height: 1.72;\">\u2699 Signe diagnostique cl\u00e9\u00a0: l\u2019usure abrasive produit des rainures directionnelles lisses. Passez votre ongle sur la surface\u00a0: lisse dans un sens, rugueuse dans l\u2019autre. Si les dommages sont lisses, progressifs et uniform\u00e9ment r\u00e9partis, la cause est une contamination ou une diff\u00e9rence de duret\u00e9, et non un probl\u00e8me de charge ou de lubrification.<\/div>\n<\/div>\n<\/div>\n<div style=\"border-radius: 12px; overflow: hidden; margin: 36px 0; box-shadow: 0 4px 20px rgba(28,8,8,.12);\">\n<div style=\"display: flex; flex-wrap: wrap; align-items: center; gap: 16px; padding: 18px 22px; background: #fff5f0; border-bottom: 2px solid #d04010;\">\n<div style=\"min-width: 50px; height: 50px; border-radius: 50%; background: #c02000; color: #fff; font-size: 20px; font-weight: 900; display: flex; align-items: center; justify-content: center; flex-shrink: 0;\">2<\/div>\n<div style=\"flex: 1; min-width: 0;\">\n<div style=\"font-size: 10px; font-weight: bold; letter-spacing: 2px; text-transform: uppercase; color: #c02000; margin-bottom: 4px;\">Mode de d\u00e9faillance 02<\/div>\n<div style=\"font-size: 17px; font-weight: 800; color: #1c0808; line-height: 1.2;\">\u00c9raflures adh\u00e9sives \u2014 La crise soudaine<\/div>\n<\/div>\n<div style=\"font-size: 11px; font-weight: bold; border-radius: 8px; padding: 4px 12px; background: #fff5f0; color: #c02000; border: 1px solid #d04010; white-space: nowrap;\">Rapide \u00b7 Souvent catastrophique<\/div>\n<\/div>\n<div style=\"background: #fff; padding: 22px 20px;\">\n<div style=\"display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 18px;\">\n<div style=\"flex: 1 1 200px; min-width: 180px;\">\n<div style=\"font-size: 10px; font-weight: bold; letter-spacing: 2px; text-transform: uppercase; color: #888; margin-bottom: 10px; padding-bottom: 6px; border-bottom: 1px solid #f0e0d8;\">\ud83d\udc41 Ce que vous voyez<\/div>\n<ul style=\"list-style: none; margin: 0; padding: 0;\">\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #5a6b7d; flex-shrink: 0; margin-top: 2px;\">\ud83d\udc41<\/span>Zones m\u00e9talliques d\u00e9chir\u00e9es, arrach\u00e9es ou tach\u00e9es sur les flancs des dents \u2014 et non des rainures lisses<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #5a6b7d; flex-shrink: 0; margin-top: 2px;\">\ud83d\udc41<\/span>Patchs de transfert m\u00e9tallique\u00a0: mat\u00e9riau d\u2019une surface d\u00e9pos\u00e9 sur l\u2019autre<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #5a6b7d; flex-shrink: 0; margin-top: 2px;\">\ud83d\udc41<\/span>Texture de surface rugueuse et irr\u00e9guli\u00e8re avec des bords d\u00e9chir\u00e9s \u2014 contraire de l'usure abrasive<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #5a6b7d; flex-shrink: 0; margin-top: 2px;\">\ud83d\udc41<\/span>D\u00e9coloration thermique bleu\/brun sur les flancs du filetage de l'arbre (couleurs de trempe)<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #5a6b7d; flex-shrink: 0; margin-top: 2px;\">\ud83d\udc41<\/span>L'huile a une odeur de br\u00fbl\u00e9 ; elle peut \u00eatre fonc\u00e9e ou pr\u00e9senter un \u00e9clat m\u00e9tallique.<\/li>\n<\/ul>\n<\/div>\n<div style=\"flex: 1 1 200px; min-width: 180px;\">\n<div style=\"font-size: 10px; font-weight: bold; letter-spacing: 2px; text-transform: uppercase; color: #888; margin-bottom: 10px; padding-bottom: 6px; border-bottom: 1px solid #f0e0d8;\">\u26a0 Causes profondes<\/div>\n<ul style=\"list-style: none; margin: 0; padding: 0;\">\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #c05030; flex-shrink: 0; margin-top: 2px;\">\u26a0<\/span>Rupture du film lubrifiant \u2014 la temp\u00e9rature d'\u00e9clair au point de contact d\u00e9passe le seuil d'adh\u00e9rence<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #c05030; flex-shrink: 0; margin-top: 2px;\">\u26a0<\/span>Lubrifiant inadapt\u00e9\u00a0: huile contenant des additifs EP qui attaquent le bronze\u00a0; certification NSF H1 sans viscosit\u00e9 ad\u00e9quate.<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #c05030; flex-shrink: 0; margin-top: 2px;\">\u26a0<\/span>Surcharge thermique extr\u00eame \u2014 effondrement de la viscosit\u00e9 de l'huile<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #c05030; flex-shrink: 0; margin-top: 2px;\">\u26a0<\/span>Niveau d'huile trop bas \u2014 lubrification intermittente insuffisante pendant la rotation du maillage<\/li>\n<\/ul>\n<\/div>\n<div style=\"flex: 1 1 200px; min-width: 180px;\">\n<div style=\"font-size: 10px; font-weight: bold; letter-spacing: 2px; text-transform: uppercase; color: #888; margin-bottom: 10px; padding-bottom: 6px; border-bottom: 1px solid #f0e0d8;\">\u2713 Solution de sp\u00e9cification<\/div>\n<ul style=\"list-style: none; margin: 0; padding: 0;\">\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #27ae60; flex-shrink: 0; margin-top: 2px;\">\u2713<\/span>V\u00e9rifiez et corrigez imm\u00e9diatement le niveau d'huile\u00a0; des rayures peuvent appara\u00eetre en quelques secondes en cas de niveau d'huile insuffisant.<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #27ae60; flex-shrink: 0; margin-top: 2px;\">\u2713<\/span>V\u00e9rifiez que le lubrifiant est non EP (sans additifs EP \u00e0 base de soufre avec une roue en bronze).<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #27ae60; flex-shrink: 0; margin-top: 2px;\">\u2713<\/span>Calculer la temp\u00e9rature d'\u00e9quilibre thermique\u00a0; si elle est sup\u00e9rieure aux sp\u00e9cifications du lubrifiant, sp\u00e9cifier un lubrifiant PAO ou am\u00e9liorer le refroidissement<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #27ae60; flex-shrink: 0; margin-top: 2px;\">\u2713<\/span>Pour les demandes NSF H1\u00a0: v\u00e9rifier que la vitesse de glissement est inf\u00e9rieure \u00e0 4 m\/s<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div style=\"background: #f8f5f0; border-radius: 8px; padding: 14px 16px; font-size: 13px; color: #5a3020; border-left: 3px solid #c9892a; line-height: 1.72;\">\u2699 Signes cl\u00e9s de diagnostic\u00a0: les rayures sont d'aspect violent \u2014 m\u00e9tal arrach\u00e9 et d\u00e9chir\u00e9, non poli. Si vous constatez une d\u00e9coloration due \u00e0 la chaleur sur le filetage de l'arbre, la pr\u00e9sence de rayures thermiques est confirm\u00e9e. En l'absence de d\u00e9coloration due \u00e0 la chaleur, mais en pr\u00e9sence de m\u00e9tal d\u00e9chir\u00e9, il est plus probable que le probl\u00e8me vienne de la composition du lubrifiant (additif EP sur bronze) ou d'un manque d'huile.<\/div>\n<\/div>\n<\/div>\n<div style=\"border-radius: 12px; overflow: hidden; margin: 36px 0; box-shadow: 0 4px 20px rgba(28,8,8,.12);\">\n<div style=\"display: flex; flex-wrap: wrap; align-items: center; gap: 16px; padding: 18px 22px; background: #f5f0ff; border-bottom: 2px solid #8060c0;\">\n<div style=\"min-width: 50px; height: 50px; border-radius: 50%; background: #6040a0; color: #fff; font-size: 20px; font-weight: 900; display: flex; align-items: center; justify-content: center; flex-shrink: 0;\">3<\/div>\n<div style=\"flex: 1; min-width: 0;\">\n<div style=\"font-size: 10px; font-weight: bold; letter-spacing: 2px; text-transform: uppercase; color: #6040a0; margin-bottom: 4px;\">Mode de d\u00e9faillance 03<\/div>\n<div style=\"font-size: 17px; font-weight: 800; color: #1c0808; line-height: 1.2;\">Fatigue par piq\u00fbres \u2014 Le probl\u00e8me des crat\u00e8res de surface<\/div>\n<\/div>\n<div style=\"font-size: 11px; font-weight: bold; border-radius: 8px; padding: 4px 12px; background: #f5f0ff; color: #6040a0; border: 1px solid #8060c0; white-space: nowrap;\">Progressif \u00b7 \u00c0 charge limit\u00e9e<\/div>\n<\/div>\n<div style=\"background: #fff; padding: 22px 20px;\">\n<div style=\"display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 18px;\">\n<div style=\"flex: 1 1 200px; min-width: 180px;\">\n<div style=\"font-size: 10px; font-weight: bold; letter-spacing: 2px; text-transform: uppercase; color: #888; margin-bottom: 10px; padding-bottom: 6px; border-bottom: 1px solid #f0e0d8;\">\ud83d\udc41 Ce que vous voyez<\/div>\n<ul style=\"list-style: none; margin: 0; padding: 0;\">\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #5a6b7d; flex-shrink: 0; margin-top: 2px;\">\ud83d\udc41<\/span>Petits crat\u00e8res h\u00e9misph\u00e9riques sur le flanc de la dent \u2014 g\u00e9n\u00e9ralement de 0,5 \u00e0 3 mm de diam\u00e8tre<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #5a6b7d; flex-shrink: 0; margin-top: 2px;\">\ud83d\udc41<\/span>Bords tranchants des crat\u00e8res (par opposition aux bords lisses de l'usure abrasive)<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #5a6b7d; flex-shrink: 0; margin-top: 2px;\">\ud83d\udc41<\/span>Crat\u00e8res concentr\u00e9s dans la zone de la ligne de pas de la face de la dent \u2014 zone de contrainte de contact de Hertz maximale<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #5a6b7d; flex-shrink: 0; margin-top: 2px;\">\ud83d\udc41<\/span>Progressive\u00a0: les premi\u00e8res piq\u00fbres montrent des crat\u00e8res isol\u00e9s\u00a0; les piq\u00fbres avanc\u00e9es montrent des crat\u00e8res fusionn\u00e9s.<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #5a6b7d; flex-shrink: 0; margin-top: 2px;\">\ud83d\udc41<\/span>Copeaux m\u00e9talliques dans l'huile, parfois anguleux (d\u00e9bris de fracture, et non particules d'usure)<\/li>\n<\/ul>\n<\/div>\n<div style=\"flex: 1 1 200px; min-width: 180px;\">\n<div style=\"font-size: 10px; font-weight: bold; letter-spacing: 2px; text-transform: uppercase; color: #888; margin-bottom: 10px; padding-bottom: 6px; border-bottom: 1px solid #f0e0d8;\">\u26a0 Causes profondes<\/div>\n<ul style=\"list-style: none; margin: 0; padding: 0;\">\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #c05030; flex-shrink: 0; margin-top: 2px;\">\u26a0<\/span>Contrainte de contact d\u00e9passant la limite de fatigue de la surface du mat\u00e9riau \u2014 surcharge, module sous-sp\u00e9cifi\u00e9<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #c05030; flex-shrink: 0; margin-top: 2px;\">\u26a0<\/span>Charges d'impact r\u00e9p\u00e9t\u00e9es (d\u00e9marrages de moteurs en ligne directe, chocs cycliques) amor\u00e7ant des fissures sous-jacentes<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #c05030; flex-shrink: 0; margin-top: 2px;\">\u26a0<\/span>Inclusions de mat\u00e9riau dans l'alliage de roue \u2014 les inclusions non m\u00e9talliques agissent comme des sites de concentration de contraintes<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #c05030; flex-shrink: 0; margin-top: 2px;\">\u26a0<\/span>Un sch\u00e9ma de contact inad\u00e9quat (contact ponctuel vs contact lin\u00e9aire) concentre la charge sur une petite surface.<\/li>\n<\/ul>\n<\/div>\n<div style=\"flex: 1 1 200px; min-width: 180px;\">\n<div style=\"font-size: 10px; font-weight: bold; letter-spacing: 2px; text-transform: uppercase; color: #888; margin-bottom: 10px; padding-bottom: 6px; border-bottom: 1px solid #f0e0d8;\">\u2713 Solution de sp\u00e9cification<\/div>\n<ul style=\"list-style: none; margin: 0; padding: 0;\">\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #27ae60; flex-shrink: 0; margin-top: 2px;\">\u2713<\/span>Augmenter la taille du module r\u00e9duit la contrainte de Hertz sur les contacts\u00a0; une augmentation de taille est g\u00e9n\u00e9ralement suffisante.<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #27ae60; flex-shrink: 0; margin-top: 2px;\">\u2713<\/span>Optez pour le bronze ZCuAl10Fe3 si la cause est un choc \u2013 sa limite d'\u00e9lasticit\u00e9 est plus \u00e9lev\u00e9e.<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #27ae60; flex-shrink: 0; margin-top: 2px;\">\u2713<\/span>V\u00e9rifier que la largeur de la surface de contact est sup\u00e9rieure ou \u00e9gale \u00e0 70% \u2014 un mauvais contact concentre la charge et acc\u00e9l\u00e8re la corrosion par piq\u00fbres<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #27ae60; flex-shrink: 0; margin-top: 2px;\">\u2713<\/span>Ajouter un contr\u00f4leur de d\u00e9marrage progressif pour \u00e9liminer les surcharges d'impulsion au d\u00e9marrage du moteur<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div style=\"background: #f8f5f0; border-radius: 8px; padding: 14px 16px; font-size: 13px; color: #5a3020; border-left: 3px solid #c9892a; line-height: 1.72;\">\u2699 Comment distinguer les piq\u00fbres de l'usure abrasive\u00a0: passez votre ongle sur la surface endommag\u00e9e. L'usure abrasive pr\u00e9sente des rainures directionnelles, lisses dans un seul sens. Les piq\u00fbres sont rugueuses dans toutes les directions et ont des bords tranchants. Ce test tactile de 5\u00a0secondes est plus fiable qu'une simple inspection visuelle sur une meule sale et souill\u00e9e d'huile.<\/div>\n<\/div>\n<\/div>\n<div style=\"border-radius: 12px; overflow: hidden; margin: 36px 0; box-shadow: 0 4px 20px rgba(28,8,8,.12);\">\n<div style=\"display: flex; flex-wrap: wrap; align-items: center; gap: 16px; padding: 18px 22px; background: #fff0f0; border-bottom: 2px solid #d00020;\">\n<div style=\"min-width: 50px; height: 50px; border-radius: 50%; background: #a00010; color: #fff; font-size: 20px; font-weight: 900; display: flex; align-items: center; justify-content: center; flex-shrink: 0;\">4<\/div>\n<div style=\"flex: 1; min-width: 0;\">\n<div style=\"font-size: 10px; font-weight: bold; letter-spacing: 2px; text-transform: uppercase; color: #a00010; margin-bottom: 4px;\">Mode de d\u00e9faillance 04<\/div>\n<div style=\"font-size: 17px; font-weight: 800; color: #1c0808; line-height: 1.2;\">Fracture dentaire \u2014 La d\u00e9faillance catastrophique soudaine<\/div>\n<\/div>\n<div style=\"font-size: 11px; font-weight: bold; border-radius: 8px; padding: 4px 12px; background: #fff0f0; color: #a00010; border: 1px solid #d00020; white-space: nowrap;\">Soudainement \u00b7 Catastrophique<\/div>\n<\/div>\n<div style=\"background: #fff; padding: 22px 20px;\">\n<div style=\"display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 18px;\">\n<div style=\"flex: 1 1 200px; min-width: 180px;\">\n<div style=\"font-size: 10px; font-weight: bold; letter-spacing: 2px; text-transform: uppercase; color: #888; margin-bottom: 10px; padding-bottom: 6px; border-bottom: 1px solid #f0e0d8;\">\ud83d\udc41 Ce que vous voyez<\/div>\n<ul style=\"list-style: none; margin: 0; padding: 0;\">\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #5a6b7d; flex-shrink: 0; margin-top: 2px;\">\ud83d\udc41<\/span>Une ou plusieurs dents manquantes sur la roue\u00a0; des morceaux cass\u00e9s dans le carter d'huile<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #5a6b7d; flex-shrink: 0; margin-top: 2px;\">\ud83d\udc41<\/span>La surface de fracture comporte deux zones\u00a0: une zone lisse de \u00ab\u00a0fatigue\u00a0\u00bb et une zone rugueuse et granuleuse de \u00ab\u00a0fracture finale\u00a0\u00bb.<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #5a6b7d; flex-shrink: 0; margin-top: 2px;\">\ud83d\udc41<\/span>Les marques de plage (lignes courbes concentriques) sur la zone de fatigue indiquent une propagation cyclique des fissures.<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #5a6b7d; flex-shrink: 0; margin-top: 2px;\">\ud83d\udc41<\/span>Soudainement : sans augmentation progressive du bruit avant le blocage ou les vibrations violentes du disque dur.<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #5a6b7d; flex-shrink: 0; margin-top: 2px;\">\ud83d\udc41<\/span>Le disque dur peut se bloquer \u00e0 cause de fragments de dents.<\/li>\n<\/ul>\n<\/div>\n<div style=\"flex: 1 1 200px; min-width: 180px;\">\n<div style=\"font-size: 10px; font-weight: bold; letter-spacing: 2px; text-transform: uppercase; color: #888; margin-bottom: 10px; padding-bottom: 6px; border-bottom: 1px solid #f0e0d8;\">\u26a0 Causes profondes<\/div>\n<ul style=\"list-style: none; margin: 0; padding: 0;\">\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #c05030; flex-shrink: 0; margin-top: 2px;\">\u26a0<\/span>Surcharge s\u00e9v\u00e8re en un seul \u00e9v\u00e9nement d\u00e9passant la limite d'\u00e9lasticit\u00e9 en flexion \u00e0 la racine de la dent<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #c05030; flex-shrink: 0; margin-top: 2px;\">\u26a0<\/span>Fatigue en flexion due \u00e0 des charges r\u00e9p\u00e9t\u00e9es \u00e0 la limite d'\u00e9lasticit\u00e9 ou \u00e0 proximit\u00e9 \u2014 la fissure s'amorce au niveau du cong\u00e9 de raccordement et se propage<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #c05030; flex-shrink: 0; margin-top: 2px;\">\u26a0<\/span>Des piq\u00fbres avanc\u00e9es s'\u00e9tendant jusqu'\u00e0 la racine de la dent \u2014 les crat\u00e8res de piq\u00fbres cr\u00e9ent une concentration de contraintes<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #c05030; flex-shrink: 0; margin-top: 2px;\">\u26a0<\/span>Rupture \u00e0 l'interface corps-caoutchouc\u00a0: la couche c\u00e9ment\u00e9e de l'arbre est trop mince, elle se fracture \u00e0 l'interface sous forte flexion.<\/li>\n<\/ul>\n<\/div>\n<div style=\"flex: 1 1 200px; min-width: 180px;\">\n<div style=\"font-size: 10px; font-weight: bold; letter-spacing: 2px; text-transform: uppercase; color: #888; margin-bottom: 10px; padding-bottom: 6px; border-bottom: 1px solid #f0e0d8;\">\u2713 Solution de sp\u00e9cification<\/div>\n<ul style=\"list-style: none; margin: 0; padding: 0;\">\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #27ae60; flex-shrink: 0; margin-top: 2px;\">\u2713<\/span>En cas de surcharge ponctuelle\u00a0: identifier et \u00e9liminer la source de surcharge avant de remplacer l\u2019\u00e9quipement.<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #27ae60; flex-shrink: 0; margin-top: 2px;\">\u2713<\/span>Pour la r\u00e9sistance \u00e0 la fatigue en flexion\u00a0: augmenter le module\u00a0; le ZCuAl10Fe3 pr\u00e9sente une r\u00e9sistance sup\u00e9rieure \u00e0 la fatigue en flexion.<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #27ae60; flex-shrink: 0; margin-top: 2px;\">\u2713<\/span>En cas de rupture de la chemise de l'arbre\u00a0: sp\u00e9cifier SCM415 avec v\u00e9rification de la profondeur de la chemise apr\u00e8s c\u00e9mentation \u2265 0,8 mm<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #27ae60; flex-shrink: 0; margin-top: 2px;\">\u2713<\/span>Avant le remontage, inspectez toutes les dents de roue restantes afin de d\u00e9celer d'\u00e9ventuels signes de fatigue pr\u00e9matur\u00e9e.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div style=\"background: #f8f5f0; border-radius: 8px; padding: 14px 16px; font-size: 13px; color: #5a3020; border-left: 3px solid #c9892a; line-height: 1.72;\">\u2699 Avant de remplacer la pi\u00e8ce, examinez la surface de rupture. Une large zone lisse avec des stries indique une propagation de fissure par fatigue sur de nombreux cycles, signe d'une surcharge r\u00e9p\u00e9t\u00e9e. Une surface de rupture presque enti\u00e8rement granulaire, sans zone lisse, indique une surcharge unique\u00a0; identifiez la cause de ce couple excessif soudain avant de commander une pi\u00e8ce de rechange.<\/div>\n<\/div>\n<\/div>\n<div style=\"border-radius: 12px; overflow: hidden; margin: 36px 0; box-shadow: 0 4px 20px rgba(28,8,8,.12);\">\n<div style=\"display: flex; flex-wrap: wrap; align-items: center; gap: 16px; padding: 18px 22px; background: #f0f5ff; border-bottom: 2px solid #3060c0;\">\n<div style=\"min-width: 50px; height: 50px; border-radius: 50%; background: #2050a0; color: #fff; font-size: 20px; font-weight: 900; display: flex; align-items: center; justify-content: center; flex-shrink: 0;\">5<\/div>\n<div style=\"flex: 1; min-width: 0;\">\n<div style=\"font-size: 10px; font-weight: bold; letter-spacing: 2px; text-transform: uppercase; color: #2050a0; margin-bottom: 4px;\">Mode de d\u00e9faillance 05<\/div>\n<div style=\"font-size: 17px; font-weight: 800; color: #1c0808; line-height: 1.2;\">Usure corrosive \u2014 L'attaque chimique<\/div>\n<\/div>\n<div style=\"font-size: 11px; font-weight: bold; border-radius: 8px; padding: 4px 12px; background: #f0f5ff; color: #2050a0; border: 1px solid #3060c0; white-space: nowrap;\">Progressif \u00b7 D\u00e9pendant de la chimie<\/div>\n<\/div>\n<div style=\"background: #fff; padding: 22px 20px;\">\n<div style=\"display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 18px;\">\n<div style=\"flex: 1 1 200px; min-width: 180px;\">\n<div style=\"font-size: 10px; font-weight: bold; letter-spacing: 2px; text-transform: uppercase; color: #888; margin-bottom: 10px; padding-bottom: 6px; border-bottom: 1px solid #f0e0d8;\">\ud83d\udc41 Ce que vous voyez<\/div>\n<ul style=\"list-style: none; margin: 0; padding: 0;\">\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #5a6b7d; flex-shrink: 0; margin-top: 2px;\">\ud83d\udc41<\/span>Taches brun fonc\u00e9, noires ou vertes sur les flancs des dents<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #5a6b7d; flex-shrink: 0; margin-top: 2px;\">\ud83d\udc41<\/span>Piq\u00fbres suivant la structure des joints de grains de l'alliage de la roue (attaque intergranulaire)<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #5a6b7d; flex-shrink: 0; margin-top: 2px;\">\ud83d\udc41<\/span>D\u00e9p\u00f4ts de produits de corrosion dans l'huile \u2014 vert = compos\u00e9s de cuivre issus de l'attaque du bronze<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #5a6b7d; flex-shrink: 0; margin-top: 2px;\">\ud83d\udc41<\/span>Attaque acc\u00e9l\u00e9r\u00e9e au niveau des crevasses, des rainures et des zones de stagnation du p\u00e9trole<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #5a6b7d; flex-shrink: 0; margin-top: 2px;\">\ud83d\udc41<\/span>Huile d\u00e9color\u00e9e en vert fonc\u00e9-noir avec des d\u00e9p\u00f4ts m\u00e9talliques visibles<\/li>\n<\/ul>\n<\/div>\n<div style=\"flex: 1 1 200px; min-width: 180px;\">\n<div style=\"font-size: 10px; font-weight: bold; letter-spacing: 2px; text-transform: uppercase; color: #888; margin-bottom: 10px; padding-bottom: 6px; border-bottom: 1px solid #f0e0d8;\">\u26a0 Causes profondes<\/div>\n<ul style=\"list-style: none; margin: 0; padding: 0;\">\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #c05030; flex-shrink: 0; margin-top: 2px;\">\u26a0<\/span>Huile pour engrenages EP r\u00e9agissant avec le cuivre d'une roue en bronze (formation de sulfure de cuivre)<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #c05030; flex-shrink: 0; margin-top: 2px;\">\u26a0<\/span>Infiltration d'eau par un joint endommag\u00e9 \u2014 formation d'\u00e9lectrolyte pour la corrosion galvanique<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #c05030; flex-shrink: 0; margin-top: 2px;\">\u26a0<\/span>Qualit\u00e9 d'acier inoxydable inadapt\u00e9e \u00e0 l'environnement (acier inoxydable 304 en milieu chlor\u00e9)<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #c05030; flex-shrink: 0; margin-top: 2px;\">\u26a0<\/span>Oxydation du lubrifiant due \u00e0 la surchauffe \u2014 l'huile d\u00e9grad\u00e9e devient acide<\/li>\n<\/ul>\n<\/div>\n<div style=\"flex: 1 1 200px; min-width: 180px;\">\n<div style=\"font-size: 10px; font-weight: bold; letter-spacing: 2px; text-transform: uppercase; color: #888; margin-bottom: 10px; padding-bottom: 6px; border-bottom: 1px solid #f0e0d8;\">\u2713 Solution de sp\u00e9cification<\/div>\n<ul style=\"list-style: none; margin: 0; padding: 0;\">\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #27ae60; flex-shrink: 0; margin-top: 2px;\">\u2713<\/span>Remplacez imm\u00e9diatement l'huile contenant des additifs EP par une huile non EP sp\u00e9cifique aux engrenages \u00e0 vis sans fin (\u00ab compatible avec les m\u00e9taux jaunes \u00bb).<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #27ae60; flex-shrink: 0; margin-top: 2px;\">\u2713<\/span>Inspecter et remplacer le joint d'arbre\u00a0; identifier le chemin d'infiltration d'eau<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #27ae60; flex-shrink: 0; margin-top: 2px;\">\u2713<\/span>Pour les environnements marins\/alimentaires\u00a0: mise \u00e0 niveau vers un arbre en acier inoxydable 316 et un mat\u00e9riau de roue appropri\u00e9<\/li>\n<li style=\"display: flex; gap: 8px; padding: 5px 0; border-bottom: 1px solid #f8f2f0; font-size: 13px; color: #3a2020;\"><span style=\"color: #27ae60; flex-shrink: 0; margin-top: 2px;\">\u2713<\/span>Vidanger l'huile et v\u00e9rifier la pr\u00e9sence de d\u00e9p\u00f4ts verts\u00a0; si c'est le cas, une attaque corrosive a eu lieu.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div style=\"background: #f8f5f0; border-radius: 8px; padding: 14px 16px; font-size: 13px; color: #5a3020; border-left: 3px solid #c9892a; line-height: 1.72;\">\u2699 Test de l'huile EP\u00a0: Si l'huile vidang\u00e9e pr\u00e9sente une teinte verte ou des d\u00e9p\u00f4ts vert-noir visibles, la cause la plus probable est une attaque des additifs EP sur le bronze. Les produits de la r\u00e9action avec le sulfure de cuivre sont particuli\u00e8rement verts. Pour confirmation, v\u00e9rifiez les sp\u00e9cifications de l'huile\u00a0: si elle contient des additifs EP \u00e0 base de soufre et que la roue est en bronze \u00e0 l'\u00e9tain ou en laiton au mangan\u00e8se, la corrosion est av\u00e9r\u00e9e.<\/div>\n<\/div>\n<\/div>\n<hr style=\"border: none; border-top: 2px solid #f0e0d8; margin: 48px 0;\" \/>\n<h2 style=\"font-size: clamp(20px,2.8vw,30px); font-weight: 800; color: #1c0808; margin: 48px 0 14px; line-height: 1.22;\">L'analyse du p\u00e9trole comme syst\u00e8me d'alerte pr\u00e9coce<\/h2>\n<p style=\"margin-bottom: 16px; font-size: 15px; color: #2c3e50; line-height: 1.82;\">Chaque mode de d\u00e9faillance d'un engrenage \u00e0 vis sans fin produit une signature de contamination de l'huile caract\u00e9ristique avant m\u00eame l'apparition de dommages visibles sur les dents. L'analyse d'huile \u2014 pr\u00e9l\u00e8vements p\u00e9riodiques et comptage des particules \u2014 constitue l'outil de diagnostic le plus rentable pour les engrenages \u00e0 vis sans fin en service continu.<\/p>\n<div style=\"display: flex; flex-wrap: wrap; gap: 16px; margin: 24px 0 28px;\">\n<div style=\"flex: 1 1 200px; min-width: 180px; background: #fff; border-radius: 10px; padding: 18px; box-shadow: 0 2px 12px rgba(28,8,8,.08); border-top: 3px solid #c05030;\">\n<div style=\"font-size: 13px; font-weight: bold; color: #1c0808; margin-bottom: 8px;\">Particules de cuivre \u00e9lev\u00e9es + fer fin<\/div>\n<div style=\"font-size: 12px; color: #5a3020; line-height: 1.65;\">Usure abrasive en cours. La contamination acc\u00e9l\u00e8re l'enl\u00e8vement de mati\u00e8re de la meule. Vidangez l'huile, v\u00e9rifiez le joint, contr\u00f4lez la duret\u00e9 de l'arbre.<\/div>\n<\/div>\n<div style=\"flex: 1 1 200px; min-width: 180px; background: #fff; border-radius: 10px; padding: 18px; box-shadow: 0 2px 12px rgba(28,8,8,.08); border-top: 3px solid #c02000;\">\n<div style=\"font-size: 13px; font-weight: bold; color: #1c0808; margin-bottom: 8px;\">Augmentation soudaine des particules de cuivre + noircissement de l'huile<\/div>\n<div style=\"font-size: 12px; color: #5a3020; line-height: 1.65;\">Un frottement s'est produit ou est en cours. Arr\u00eatez imm\u00e9diatement la visseuse. Inspectez les flancs des dents avant de reprendre le fonctionnement.<\/div>\n<\/div>\n<div style=\"flex: 1 1 200px; min-width: 180px; background: #fff; border-radius: 10px; padding: 18px; box-shadow: 0 2px 12px rgba(28,8,8,.08); border-top: 3px solid #6040a0;\">\n<div style=\"font-size: 13px; font-weight: bold; color: #1c0808; margin-bottom: 8px;\">Des copeaux m\u00e9talliques angulaires (&gt;100 \u00b5m) apparaissent<\/div>\n<div style=\"font-size: 12px; color: #5a3020; line-height: 1.65;\">Pr\u00e9sence de piq\u00fbres provoquant des \u00e9clats de fracture. Surcharge ou probl\u00e8me de contact. Inspectez les flancs des dents lors de la prochaine intervention de maintenance\u00a0; n\u2019attendez pas.<\/div>\n<\/div>\n<div style=\"flex: 1 1 200px; min-width: 180px; background: #fff; border-radius: 10px; padding: 18px; box-shadow: 0 2px 12px rgba(28,8,8,.08); border-top: 3px solid #2050a0;\">\n<div style=\"font-size: 13px; font-weight: bold; color: #1c0808; margin-bottom: 8px;\">Couleur verte \/ augmentation de l'indice d'acide<\/div>\n<div style=\"font-size: 12px; color: #5a3020; line-height: 1.65;\">Attaque corrosive en cours. Vidangez l'huile imm\u00e9diatement, quel que soit l'intervalle. V\u00e9rifiez les sp\u00e9cifications du lubrifiant\u00a0: contamination par des additifs EP ou infiltration d'eau quasi certaine.<\/div>\n<\/div>\n<\/div>\n<h2 style=\"font-size: clamp(20px,2.8vw,30px); font-weight: 800; color: #1c0808; margin: 48px 0 14px; line-height: 1.22;\">Triage rapide \u2014 Associer le sympt\u00f4me au mode de d\u00e9faillance<\/h2>\n<div style=\"overflow-x: auto; margin: 24px 0 28px; border-radius: 8px; box-shadow: 0 2px 14px rgba(28,8,8,.10);\">\n<table style=\"width: 100%; border-collapse: collapse; font-size: 13px; min-width: 560px;\">\n<thead>\n<tr style=\"background: #1c0808;\">\n<th style=\"padding: 11px 14px; text-align: left; color: #fff; font-size: 12px; font-weight: 600;\">Observation lors de l'inspection<\/th>\n<th style=\"padding: 11px 14px; text-align: left; color: #fff; font-size: 12px; font-weight: 600;\">Mode de d\u00e9faillance le plus probable<\/th>\n<th style=\"padding: 11px 14px; text-align: left; color: #fff; font-size: 12px; font-weight: 600;\">Urgence<\/th>\n<th style=\"padding: 11px 14px; text-align: left; color: #fff; font-size: 12px; font-weight: 600;\">Premier contr\u00f4le<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"background: #fff8f5;\">\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #f0e0d8; font-weight: bold; color: #1c0808; font-size: 13px;\">Rainures directionnelles lisses sur la face de la dent<\/td>\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #f0e0d8; font-size: 13px;\">Usure abrasive<\/td>\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #f0e0d8;\"><span style=\"background: #fff8e8; color: #a06010; font-size: 11px; font-weight: 600; padding: 2px 8px; border-radius: 6px;\">Moyen<\/span><\/td>\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #f0e0d8; font-size: 13px;\">V\u00e9rifier la pr\u00e9sence de d\u00e9bris m\u00e9talliques dans l'huile\u00a0; inspecter le joint d'arbre<\/td>\n<\/tr>\n<tr style=\"background: #fff;\">\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #f0e0d8; font-weight: bold; color: #1c0808; font-size: 13px;\">M\u00e9tal d\u00e9chir\u00e9 et \u00e9tir\u00e9 ; surface rugueuse et irr\u00e9guli\u00e8re<\/td>\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #f0e0d8; font-size: 13px;\">\u00c9raflures adh\u00e9sives<\/td>\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #f0e0d8;\"><span style=\"background: #fde0d8; color: #c02010; font-size: 11px; font-weight: bold; padding: 2px 8px; border-radius: 6px;\">\u26a0 Haut niveau \u2014 arr\u00eatez de conduire<\/span><\/td>\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #f0e0d8; font-size: 13px;\">V\u00e9rifier le niveau d'huile\u00a0; v\u00e9rifier la pr\u00e9sence d'additifs EP dans le lubrifiant\u00a0; v\u00e9rifier la temp\u00e9rature du carter<\/td>\n<\/tr>\n<tr style=\"background: #fff8f5;\">\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #f0e0d8; font-weight: bold; color: #1c0808; font-size: 13px;\">Petits crat\u00e8res \u00e0 bords tranchants \u00e0 la ligne de pente<\/td>\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #f0e0d8; font-size: 13px;\">fatigue par piq\u00fbres<\/td>\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #f0e0d8;\"><span style=\"background: #fff8e8; color: #a06010; font-size: 11px; font-weight: 600; padding: 2px 8px; border-radius: 6px;\">Moyen<\/span><\/td>\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #f0e0d8; font-size: 13px;\">V\u00e9rifier le sch\u00e9ma de contact ; contr\u00f4ler les chocs dans l'historique de fonctionnement<\/td>\n<\/tr>\n<tr style=\"background: #fff;\">\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #f0e0d8; font-weight: bold; color: #1c0808; font-size: 13px;\">Dent manquante \/ fragment de dent cass\u00e9e<\/td>\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #f0e0d8; font-size: 13px;\">Tooth fracture<\/td>\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #f0e0d8;\"><span style=\"background: #fde0d8; color: #c02010; font-size: 11px; font-weight: bold; padding: 2px 8px; border-radius: 6px;\">\u26a0 High \u2014 replace before run<\/span><\/td>\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #f0e0d8; font-size: 13px;\">Inspect fracture surface for fatigue beach marks vs overload; remove all fragments<\/td>\n<\/tr>\n<tr style=\"background: #fff8f5;\">\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #f0e0d8; font-weight: bold; color: #1c0808; font-size: 13px;\">Green\/black staining; intergranular texture<\/td>\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #f0e0d8; font-size: 13px;\">Corrosive wear<\/td>\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #f0e0d8;\"><span style=\"background: #fff8e8; color: #a06010; font-size: 11px; font-weight: 600; padding: 2px 8px; border-radius: 6px;\">Moyen<\/span><\/td>\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #f0e0d8; font-size: 13px;\">Drain oil and check for green deposits; verify lubricant specification<\/td>\n<\/tr>\n<tr style=\"background: #fff;\">\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #f0e0d8; font-weight: bold; color: #1c0808; font-size: 13px;\">Augmentation progressive du bruit sur plusieurs semaines<\/td>\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #f0e0d8; font-size: 13px;\">Abrasive wear or advanced pitting<\/td>\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #f0e0d8;\"><span style=\"background: #e8f8e0; color: #1a7020; font-size: 11px; font-weight: 600; padding: 2px 8px; border-radius: 6px;\">Lower urgency<\/span><\/td>\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #f0e0d8; font-size: 13px;\">Oil sample analysis; plan inspection within next 200 operating hours<\/td>\n<\/tr>\n<tr style=\"background: #fff8f5;\">\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #f0e0d8; font-weight: bold; color: #1c0808; font-size: 13px;\">Sudden noise with vibration; no prior warning<\/td>\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #f0e0d8; font-size: 13px;\">Tooth fracture or severe scuffing<\/td>\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #f0e0d8;\"><span style=\"background: #fde0d8; color: #c02010; font-size: 11px; font-weight: bold; padding: 2px 8px; border-radius: 6px;\">\u26a0 High \u2014 stop immediately<\/span><\/td>\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #f0e0d8; font-size: 13px;\">Do not attempt restart; inspect for fragments before any test run<\/td>\n<\/tr>\n<tr style=\"background: #fff;\">\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #f0e0d8; font-weight: bold; color: #1c0808; font-size: 13px;\">Drive runs hot but looks undamaged visually<\/td>\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #f0e0d8; font-size: 13px;\">Thermal overload \u2014 pre-scuffing<\/td>\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #f0e0d8;\"><span style=\"background: #fde0d8; color: #c02010; font-size: 11px; font-weight: bold; padding: 2px 8px; border-radius: 6px;\">\u26a0 High \u2014 intervene now<\/span><\/td>\n<td style=\"padding: 10px 14px; border-bottom: 1px solid #f0e0d8; font-size: 13px;\">Check lubricant viscosity grade vs operating temperature; consider multi-start efficiency improvement<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<div style=\"border-left: 4px solid #c0392b; background: #fdf0ef; padding: 18px 22px; margin: 0 0 28px; border-radius: 0 6px 6px 0;\">\n<p style=\"margin: 0; font-size: 14px; color: #5c1c17; line-height: 1.72;\"><strong style=\"color: #9b2335;\">Never restart a drive after tooth fracture without removing all fragments.<\/strong> A single bronze tooth fragment in the housing will circulate in the oil, score both tooth flanks of all remaining wheel teeth, and initiate abrasive wear that produces more fragments. After tooth fracture, fully flush the housing, replace the oil, and run at 20% load for 30 minutes while monitoring housing temperature before returning to full load.<\/p>\n<\/div>\n<\/div>\n<section style=\"background: #fff8f5; padding: 52px 0;\">\n<div style=\"max-width: 1100px; margin: 0 auto; padding: 0 20px; box-sizing: border-box;\">\n<div style=\"text-align: center; margin-bottom: 32px;\">\n<p><span style=\"display: inline-block; background: rgba(192,80,48,.12); color: #c05030; font-size: 11px; font-weight: bold; letter-spacing: 2px; text-transform: uppercase; padding: 5px 14px; border-radius: 20px; margin-bottom: 10px;\">Produits Ever-Power de Cor\u00e9e<\/span><\/p>\n<h2 style=\"color: #1c0808; margin: 0; font-size: clamp(20px,2.8vw,30px); font-weight: 800;\">Replacement Worm Gears \u2014 Specified to Prevent Repeat Failure<\/h2>\n<\/div>\n<div style=\"display: flex; flex-wrap: wrap; gap: 20px;\">\n<div style=\"flex: 1 1 280px; min-width: 260px; background: #fff; border-radius: 10px; overflow: hidden; box-shadow: 0 4px 18px rgba(28,8,8,.09); display: flex; flex-direction: column;\">\n<div style=\"height: 185px; overflow: hidden;\"><img decoding=\"async\" style=\"width: 100%; height: 100%; object-fit: cover; display: block;\" src=\"https:\/\/wormwheelgear.top\/wp-content\/uploads\/2026\/04\/Alloy-Steel-Worm-and-Worm-Gear.webp\" alt=\"Ensemble vis sans fin et engrenage \u00e0 vis sans fin en acier alli\u00e9\" title=\"\"><\/div>\n<div style=\"padding: 20px; flex: 1; display: flex; flex-direction: column;\">\n<div style=\"font-size: 10px; font-weight: bold; letter-spacing: 1px; text-transform: uppercase; color: #c05030; margin-bottom: 7px;\">Replacement \u00b7 Documentation Included<\/div>\n<div style=\"font-size: 16px; font-weight: 800; color: #1c0808; margin-bottom: 10px; line-height: 1.3;\">Ensemble vis sans fin et engrenage \u00e0 vis sans fin en acier alli\u00e9<\/div>\n<div style=\"font-size: 13px; color: #5a6b7d; line-height: 1.7; flex: 1; margin-bottom: 14px;\">For the replacement of failed worm gear sets in industrial conveyor, agricultural, and automation drives, the key requirement is documented hardness \u2014 not just a material designation. A replacement shaft that is nominally 40Cr but has not been adequately through-hardened will reproduce the abrasive wear or scuffing failure that destroyed the original. Korea Ever-Power includes a hardness measurement certificate (Rockwell HRC, measured at 3 points along the thread zone) with every alloy steel worm shaft \u2014 not relying on heat treatment process records alone. The ZCuSn10Pb1 wheel includes material composition certificate confirming tin content, lead content, and copper content to the GB\/T 1176 standard. When ordering to replace a failed gear set, provide the failure description and we confirm whether the original specification was adequate or recommend an upgrade to prevent recurrence.<\/div>\n<p><a style=\"display: inline-flex; align-items: center; gap: 5px; font-size: 13px; font-weight: bold; color: #c05030; text-decoration: none; margin-top: auto;\" href=\"https:\/\/wormwheelgear.top\/fr\/product\/alloy-steel-worm-and-worm-gear\/\" target=\"_blank\" rel=\"noopener\">Afficher\/Demander les sp\u00e9cifications \u2192<\/a><\/p>\n<\/div>\n<\/div>\n<div style=\"flex: 1 1 280px; min-width: 260px; background: #fff; border-radius: 10px; overflow: hidden; box-shadow: 0 4px 18px rgba(28,8,8,.09); display: flex; flex-direction: column;\">\n<div style=\"height: 185px; overflow: hidden;\"><img decoding=\"async\" style=\"width: 100%; height: 100%; object-fit: cover; display: block;\" src=\"https:\/\/wormwheelgear.top\/wp-content\/uploads\/2026\/04\/Cylindrical-Worm-Wheel.webp\" alt=\"Cylindrical Worm Wheel \u2014 Replacement Supply\" title=\"\"><\/div>\n<div style=\"padding: 20px; flex: 1; display: flex; flex-direction: column;\">\n<div style=\"font-size: 10px; font-weight: bold; letter-spacing: 1px; text-transform: uppercase; color: #c05030; margin-bottom: 7px;\">Contact Pattern Verified \u00b7 Replacement<\/div>\n<div style=\"font-size: 16px; font-weight: 800; color: #1c0808; margin-bottom: 10px; line-height: 1.3;\">Cylindrical Worm Wheel \u2014 Replacement Supply<\/div>\n<div style=\"font-size: 13px; color: #5a6b7d; line-height: 1.7; flex: 1; margin-bottom: 14px;\">When the failure analysis shows premature pitting fatigue \u2014 particularly craters concentrated in a narrow band at the pitch line rather than distributed across the tooth face \u2014 the root cause is frequently poor contact pattern rather than overload. Point contact from a mismatched hobbing cutter concentrates the full tooth load on a fraction of the face width, raising the Hertz contact stress to 3\u20135\u00d7 the nominal design value. Korea Ever-Power precision-hobs replacement worm wheels with a cutter profile matched to your specific worm geometry (provide the worm shaft lead, module, and pitch diameter), then tests the contact pattern on an assembly rig before shipment. Contact coverage percentage is photographed and included in the delivery documentation.<\/div>\n<p><a style=\"display: inline-flex; align-items: center; gap: 5px; font-size: 13px; font-weight: bold; color: #c05030; text-decoration: none; margin-top: auto;\" href=\"https:\/\/wormwheelgear.top\/fr\/product\/cylindrical-worm-wheel\/\" target=\"_blank\" rel=\"noopener\">Afficher\/Demander les sp\u00e9cifications \u2192<\/a><\/p>\n<\/div>\n<\/div>\n<div style=\"flex: 1 1 280px; min-width: 260px; background: #fff; border-radius: 10px; overflow: hidden; box-shadow: 0 4px 18px rgba(28,8,8,.09); display: flex; flex-direction: column;\">\n<div style=\"height: 185px; overflow: hidden;\"><img decoding=\"async\" style=\"width: 100%; height: 100%; object-fit: cover; display: block;\" src=\"https:\/\/wormwheelgear.top\/wp-content\/uploads\/2026\/04\/worm-gear-workshop-4.webp\" alt=\"Failure-Driven Specification Review\" title=\"\"><\/div>\n<div style=\"padding: 20px; flex: 1; display: flex; flex-direction: column;\">\n<div style=\"font-size: 10px; font-weight: bold; letter-spacing: 1px; text-transform: uppercase; color: #c05030; margin-bottom: 7px;\">Custom \u00b7 Failure Analysis Support<\/div>\n<div style=\"font-size: 16px; font-weight: 800; color: #1c0808; margin-bottom: 10px; line-height: 1.3;\">Failure-Driven Specification Review<\/div>\n<div style=\"font-size: 13px; color: #5a6b7d; line-height: 1.7; flex: 1; margin-bottom: 14px;\">For applications with a history of repeated worm gear failures where the root cause has not been definitively identified, Korea Ever-Power offers a specification review based on your failure description. Send us: the failed gear set dimensions (or the original order specification), photographs of the failed tooth surfaces, the oil specification currently used, the operating temperature range, the duty cycle (hours per day, starting frequency), and any unusual operating events that preceded failure. We identify the most probable failure mode from your description, check the original specification against the duty conditions, and provide a written specification recommendation for the replacement that addresses the identified root cause. This service is available at no charge for replacement orders and for serious enquiries from engineers specifying new machines on similar duty.<\/div>\n<p><a style=\"display: inline-flex; align-items: center; gap: 5px; font-size: 13px; font-weight: bold; color: #c05030; text-decoration: none; margin-top: auto;\" href=\"https:\/\/wormwheelgear.top\/fr\/contact-us\/\" target=\"_blank\" rel=\"noopener\">Afficher\/Demander les sp\u00e9cifications \u2192<\/a><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n<div style=\"max-width: 900px; margin: 0 auto; padding: 52px 0; box-sizing: border-box;\">\n<div style=\"text-align: center; margin-bottom: 32px;\">\n<p><span style=\"display: inline-block; background: rgba(192,80,48,.12); color: #c05030; font-size: 11px; font-weight: bold; letter-spacing: 2px; text-transform: uppercase; padding: 5px 14px; border-radius: 20px; margin-bottom: 10px;\">Failure Diagnosis FAQ<\/span><\/p>\n<h2 style=\"color: #1c0808; margin: 0; font-size: clamp(20px,2.8vw,28px); font-weight: 800;\">Worm Gear Failure \u2014 Questions from Maintenance and Design Engineers<\/h2>\n<\/div>\n<details style=\"border: 1px solid #e8d0c8; border-radius: 8px; margin-bottom: 10px; overflow: hidden;\">\n<summary style=\"padding: 16px 20px; cursor: pointer; font-size: 15px; font-weight: bold; color: #1c0808; list-style: none; display: flex; justify-content: space-between; align-items: center; gap: 12px;\">My worm wheel wears visibly every year and needs replacement. Is this normal, and how do I know if I&#8217;m getting acceptable wear life?<span style=\"font-size: 22px; font-weight: 400; color: #c05030; flex-shrink: 0;\">+<\/span><\/summary>\n<div style=\"padding: 0 20px 18px; font-size: 14px; color: #3d4f66; line-height: 1.82;\">\n<p style=\"margin: 0;\">Annual visible wear is not normal for a correctly specified worm gear set in normal industrial duty. A properly specified and lubricated set should exhibit measurable tooth flank wear of approximately 0.01\u20130.03 mm over 5,000 operating hours \u2014 typically years rather than months before replacement is required. If you are replacing the wheel annually, one or more specification parameters is wrong: hardness differential, lubricant type, lubricant contamination, or overloading. The correct approach is not to accept annual replacement as normal maintenance but to identify the accelerated wear mechanism and correct it \u2014 wear particle count in oil samples at 500-hour intervals will show whether the wear rate is stable (acceptable) or increasing (problem requiring intervention).<\/p>\n<\/div>\n<\/details>\n<details style=\"border: 1px solid #e8d0c8; border-radius: 8px; margin-bottom: 10px; overflow: hidden;\">\n<summary style=\"padding: 16px 20px; cursor: pointer; font-size: 15px; font-weight: bold; color: #1c0808; list-style: none; display: flex; justify-content: space-between; align-items: center; gap: 12px;\">How do I distinguish between the worm shaft and worm wheel being the source of damage if both show wear marks?<span style=\"font-size: 22px; font-weight: 400; color: #c05030; flex-shrink: 0;\">+<\/span><\/summary>\n<div style=\"padding: 0 20px 18px; font-size: 14px; color: #3d4f66; line-height: 1.82;\">\n<p style=\"margin: 0;\">In a correctly specified drive, the shaft is always the harder surface and the wheel is the wearing surface. Wear marks on the shaft thread flanks are abnormal and indicate either (a) abrasive contamination abrading both surfaces simultaneously, or (b) hardness differential reversal \u2014 the shaft has not been adequately hardened. Check shaft hardness with a portable Rockwell tester. If the shaft is below specification hardness, hardness differential failure is confirmed. The shaft damage will typically show directional wear marks parallel to the thread helix, while wheel damage shows marks parallel to the tooth face sliding direction.<\/p>\n<\/div>\n<\/details>\n<details style=\"border: 1px solid #e8d0c8; border-radius: 8px; margin-bottom: 10px; overflow: hidden;\">\n<summary style=\"padding: 16px 20px; cursor: pointer; font-size: 15px; font-weight: bold; color: #1c0808; list-style: none; display: flex; justify-content: space-between; align-items: center; gap: 12px;\">Can a worm gear drive recover from early pitting if the operating conditions are improved?<span style=\"font-size: 22px; font-weight: 400; color: #c05030; flex-shrink: 0;\">+<\/span><\/summary>\n<div style=\"padding: 0 20px 18px; font-size: 14px; color: #3d4f66; line-height: 1.82;\">\n<p style=\"margin: 0;\">Sometimes, but the conditions for recovery are specific. Early pitting \u2014 isolated craters not yet merged, no craters deeper than approximately 0.5 mm, confined to the pitch line area \u2014 can stabilise if the load is reduced to below the Hertz fatigue limit. In practice, this means reducing torque to approximately 60\u201370% of the value that caused pitting. More commonly, early pitting provides the crack initiation sites for progressive pitting fatigue, and the pitting rate accelerates. If pitting is detected early during a scheduled oil analysis review, use the opportunity to plan a gear replacement before the next maintenance interval \u2014 do not wait for pitting to become a tooth fracture event.<\/p>\n<\/div>\n<\/details>\n<details style=\"border: 1px solid #e8d0c8; border-radius: 8px; margin-bottom: 10px; overflow: hidden;\">\n<summary style=\"padding: 16px 20px; cursor: pointer; font-size: 15px; font-weight: bold; color: #1c0808; list-style: none; display: flex; justify-content: space-between; align-items: center; gap: 12px;\">What is the correct oil to use for a worm gear drive, and why does this come up so often in failure analysis?<span style=\"font-size: 22px; font-weight: 400; color: #c05030; flex-shrink: 0;\">+<\/span><\/summary>\n<div style=\"padding: 0 20px 18px; font-size: 14px; color: #3d4f66; line-height: 1.82;\">\n<p style=\"margin: 0;\">The correct oil is an ISO VG 220\u2013460 mineral gear oil or synthetic PAO oil specifically described as &#8216;suitable for worm gears,&#8217; &#8216;bronze compatible,&#8217; or &#8216;suitable for yellow metals.&#8217; These designations confirm the formulation does not include sulfur-based Extreme Pressure (EP) additives \u2014 which react with the copper content of bronze and brass worm wheels to form copper sulfide corrosion products. This issue appears so often in failure analysis because standard industrial gear oil \u2014 the oil in the maintenance store for the helical gear trains on the same production line \u2014 typically contains sulfur-based EP additives and is entirely appropriate for helical gears. Maintenance personnel who refill a worm gear drive from the same container they use for helical gear reducers introduce EP additives that begin corrosive attack on the bronze wheel. Always label worm gear drives clearly with the specific oil specification required.<\/p>\n<\/div>\n<\/details>\n<details style=\"border: 1px solid #e8d0c8; border-radius: 8px; margin-bottom: 10px; overflow: hidden;\">\n<summary style=\"padding: 16px 20px; cursor: pointer; font-size: 15px; font-weight: bold; color: #1c0808; list-style: none; display: flex; justify-content: space-between; align-items: center; gap: 12px;\">Is it safe to continue running a drive that I suspect has early scuffing? How quickly does scuffing progress?<span style=\"font-size: 22px; font-weight: 400; color: #c05030; flex-shrink: 0;\">+<\/span><\/summary>\n<div style=\"padding: 0 20px 18px; font-size: 14px; color: #3d4f66; line-height: 1.82;\">\n<p style=\"margin: 0;\">Do not continue running a drive with suspected active scuffing. Scuffing is a thermally-activated adhesive mechanism with a positive feedback character \u2014 each scuffing event increases surface roughness, which increases local temperature in subsequent mesh contacts, which makes further scuffing easier. The progression from initial scuffing marks to catastrophic failure can be hours to days depending on load, speed, and lubricant condition. Stop the drive, check oil level, drain oil and inspect for torn metallic debris, check housing temperature. If the oil showed significant metallic debris or the housing is hot, do not restart until the tooth flanks are inspected and the root cause identified.<\/p>\n<\/div>\n<\/details>\n<details style=\"border: 1px solid #e8d0c8; border-radius: 8px; margin-bottom: 10px; overflow: hidden;\">\n<summary style=\"padding: 16px 20px; cursor: pointer; font-size: 15px; font-weight: bold; color: #1c0808; list-style: none; display: flex; justify-content: space-between; align-items: center; gap: 12px;\">What is the difference between pitting caused by overload and pitting caused by poor contact pattern?<span style=\"font-size: 22px; font-weight: 400; color: #c05030; flex-shrink: 0;\">+<\/span><\/summary>\n<div style=\"padding: 0 20px 18px; font-size: 14px; color: #3d4f66; line-height: 1.82;\">\n<p style=\"margin: 0;\">The distribution of the pitting craters tells the story. Overload-driven pitting tends to be distributed across the contact band of most or all teeth, with approximately uniform crater density \u2014 the load is distributed across all teeth, and all teeth are equally stressed above the fatigue limit. Poor contact pattern-driven pitting, by contrast, is concentrated in a narrow band corresponding to the actual contact zone (which is narrower than the design contact zone), and may be particularly severe on the entry side of the tooth face. If you see pitting in a band narrower than half the tooth face width, contact pattern is the likely contributor even if overload is also present.<\/p>\n<\/div>\n<\/details>\n<details style=\"border: 1px solid #e8d0c8; border-radius: 8px; margin-bottom: 10px; overflow: hidden;\">\n<summary style=\"padding: 16px 20px; cursor: pointer; font-size: 15px; font-weight: bold; color: #1c0808; list-style: none; display: flex; justify-content: space-between; align-items: center; gap: 12px;\">After a tooth fracture failure, what checks should I do on the replacement gear set before returning the machine to production?<span style=\"font-size: 22px; font-weight: 400; color: #c05030; flex-shrink: 0;\">+<\/span><\/summary>\n<div style=\"padding: 0 20px 18px; font-size: 14px; color: #3d4f66; line-height: 1.82;\">\n<p style=\"margin: 0;\">Before and during startup after tooth fracture replacement: (1) Thoroughly flush the housing with clean oil and drain \u2014 do not simply top up; (2) Inspect the worm shaft thread visually for scoring from impact or circulating fragments \u2014 if the shaft shows significant thread damage, replace the shaft too; (3) At reassembly, manually rotate the gear set through several full wheel rotations and confirm no metallic contact noise; (4) Fill with fresh oil to the correct level; (5) Start at 20% load and hold for 30 minutes while monitoring housing temperature; (6) Increase to 50% load for 1 hour, check temperature again; (7) Confirm full load operation for 2 hours before returning to production.<\/p>\n<\/div>\n<\/details>\n<details style=\"border: 1px solid #e8d0c8; border-radius: 8px; margin-bottom: 10px; overflow: hidden;\">\n<summary style=\"padding: 16px 20px; cursor: pointer; font-size: 15px; font-weight: bold; color: #1c0808; list-style: none; display: flex; justify-content: space-between; align-items: center; gap: 12px;\">My worm gear drive makes a noise that gets louder when the ambient temperature drops (winter mornings). Is this a failure mode?<span style=\"font-size: 22px; font-weight: 400; color: #c05030; flex-shrink: 0;\">+<\/span><\/summary>\n<div style=\"padding: 0 20px 18px; font-size: 14px; color: #3d4f66; line-height: 1.82;\">\n<p style=\"margin: 0;\">This is almost certainly a lubricant viscosity problem, not a mechanical failure mode. At low ambient temperatures, standard mineral gear oil viscosity increases dramatically \u2014 ISO VG 460 mineral oil at 5\u00b0C may have a viscosity 5\u20138\u00d7 higher than at operating temperature. This high-viscosity cold oil creates significant viscous drag as the worm thread churns through it, and the uneven resistance produces noise and vibration. If the noise resolves within 10\u201320 minutes of running as the oil warms up, the gears themselves are not damaged. Switch to synthetic PAO ISO VG 220 which remains more fluid at low temperatures. If the noise does not resolve as the drive warms up, or if it has been getting progressively louder over weeks regardless of temperature, investigate for abrasive wear or early pitting.<\/p>\n<\/div>\n<\/details>\n<\/div>\n<div style=\"background: linear-gradient(135deg,#1c0808,#3a0f0f); padding: 52px 20px; text-align: center;\">\n<div style=\"max-width: 900px; margin: 0 auto; padding: 0 20px; box-sizing: border-box;\">\n<h2 style=\"color: #fff; font-size: clamp(20px,3vw,30px); font-weight: 800; margin: 0 0 12px;\">Replace a Failed Gear Set with the Right Specification<\/h2>\n<p style=\"color: rgba(255,255,255,.68); font-size: 16px; max-width: 520px; margin: 0 auto 28px; line-height: 1.7;\">Describe the failure mode you observed. Korea Ever-Power identifies the specification change that prevents recurrence and provides a replacement set with documented hardness, contact pattern, and material certificates \u2014 so the investigation is complete before the next failure cycle starts.<\/p>\n<div style=\"display: flex; flex-wrap: wrap; gap: 14px; justify-content: center;\"><a style=\"display: inline-flex; align-items: center; gap: 8px; padding: 14px 28px; border-radius: 8px; font-size: 15px; font-weight: bold; text-decoration: none; background: linear-gradient(135deg,#c05030,#d44020); color: #fff;\" href=\"https:\/\/wormwheelgear.top\/fr\/contact-us\/\">\u2709 Describe Your Failure<\/a><br \/>\n<a style=\"display: inline-flex; align-items: center; gap: 8px; padding: 14px 28px; border-radius: 8px; font-size: 15px; font-weight: bold; text-decoration: none; background: transparent; color: #fff; border: 2px solid rgba(255,255,255,.45);\" href=\"https:\/\/wormwheelgear.top\/fr\/product-category\/worm-gear\/\">\u2699 Browse Replacement Products<\/a><\/div>\n<\/div>\n<\/div>\n<p>\u00c9diteur : Cxm<\/p>","protected":false},"excerpt":{"rendered":"<p>! Knowledge Series \u00b7 Worm Gear Fundamentals Worm Gear Failure Diagnosis \u2014 Five Modes, How to Tell Them Apart, and What Each Means for Your Specification A worm wheel that wore out in three months and one that lasted five years can look almost identical at first inspection. The difference is in the failure mode [&hellip;]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[4774],"tags":[1394,1399],"class_list":["post-1891","post","type-post","status-publish","format-standard","hentry","category-worm-gear","tag-worm-gear","tag-worm-gear-worm"],"_links":{"self":[{"href":"https:\/\/wormwheelgear.top\/fr\/wp-json\/wp\/v2\/posts\/1891","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wormwheelgear.top\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wormwheelgear.top\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wormwheelgear.top\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/wormwheelgear.top\/fr\/wp-json\/wp\/v2\/comments?post=1891"}],"version-history":[{"count":1,"href":"https:\/\/wormwheelgear.top\/fr\/wp-json\/wp\/v2\/posts\/1891\/revisions"}],"predecessor-version":[{"id":1892,"href":"https:\/\/wormwheelgear.top\/fr\/wp-json\/wp\/v2\/posts\/1891\/revisions\/1892"}],"wp:attachment":[{"href":"https:\/\/wormwheelgear.top\/fr\/wp-json\/wp\/v2\/media?parent=1891"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wormwheelgear.top\/fr\/wp-json\/wp\/v2\/categories?post=1891"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wormwheelgear.top\/fr\/wp-json\/wp\/v2\/tags?post=1891"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}