{"id":1780,"date":"2026-04-07T09:01:08","date_gmt":"2026-04-07T09:01:08","guid":{"rendered":"https:\/\/wormwheelgear.top\/?post_type=product&p=1780"},"modified":"2026-04-07T09:01:08","modified_gmt":"2026-04-07T09:01:08","slug":"duplex-worm-gear-dual-lead-continuously-adjustable-backlash","status":"publish","type":"product","link":"https:\/\/wormwheelgear.top\/sk\/product\/duplex-worm-gear-dual-lead-continuously-adjustable-backlash\/","title":{"rendered":"Dvojit\u00fd z\u00e1vitovkov\u00fd prevod | Dvojit\u00e9 vedenie, plynule nastavite\u013en\u00e1 v\u00f4\u013ea"},"content":{"rendered":"
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Preh\u013ead produktu<\/h2>\n

<\/p>\n

Every standard worm drive accumulates backlash as the tooth faces wear. The worn metal is gone \u2014 the center distance cannot be reduced, and the only way to close the gap between the worm thread flank and the wheel tooth face in a standard drive is to replace both the worm and the wheel. This is expensive and time-consuming, but for most industrial drives it is acceptable because the backlash specification is not critical. In precision positioning drives \u2014 CNC rotary tables, milling machine feed systems, measuring machine axes \u2014 even 0.05 mm of angular backlash is too much. A 0.05 mm backlash at the worm wheel pitch circle of a 100 mm diameter wheel translates to approximately 3.4 arc-minutes of positional error, enough to cause visible surface irregularities on a machined workpiece. Korea Ever-Power Worm Gear Co., Ltd manufactures duplex worm gear sets \u2014 also called dual-lead worm gears \u2014 that solve this problem by making the worm’s tooth thickness vary continuously along its length, so that axial shift of the worm restores the original backlash without replacing any components. This duplexn\u00fd z\u00e1vitovkov\u00fd prevod<\/a> set is the correct solution wherever bidirectional positioning accuracy must be maintained over the drive’s service life.<\/p>\n

\"Duplexn\u00fd<\/p>\n

<\/p>\n

Ako funguje princ\u00edp dvojit\u00e9ho vedenia \u2013 In\u017einiersky mechanizmus<\/h2>\n

Duplexn\u00fd z\u00e1vitovkov\u00fd mechanizmus sa vyr\u00e1ba s mierne odli\u0161n\u00fdmi hodnotami st\u00fapania na \u013eavom a pravom boku ka\u017ed\u00e9ho z\u00e1vitu. Rozdiel je mal\u00fd, ale presne kontrolovan\u00fd \u2013 zvy\u010dajne ide o nieko\u013eko desat\u00edn milimetra rozdiel v axi\u00e1lnom rozstupe medzi oboma bokmi. D\u00f4sledkom tohto rozdielu je, \u017ee hr\u00fabka zuba \u2013 meran\u00e1 na rozstupovom valci \u2013 sa plynule zv\u00e4\u010d\u0161uje od jedn\u00e9ho konca z\u00e1vitovkov\u00e9ho mechanizmu k druh\u00e9mu. Na tenkom konci z\u00e1vitovkov\u00e9ho mechanizmu vo\u013ene zapad\u00e1 do medzery zubov kolesa s merate\u013enou v\u00f4\u013eou. Na hrubom konci z\u00e1vitovkov\u00e9ho mechanizmu tesne zapad\u00e1 s takmer nulovou v\u00f4\u013eou. Medzera medzi po sebe id\u00facimi z\u00e1vitmi (\u0161\u00edrka medzery zubov) sa zodpovedaj\u00facim sp\u00f4sobom zmen\u0161uje \u2013 z\u00e1vit a medzera s\u00fa komplement\u00e1rne.<\/p>\n

Nastavenie v\u00f4le sa vykon\u00e1va axi\u00e1lnym posunut\u00edm z\u00e1vitovky tak, aby sa \u010das\u0165 z\u00e1vitovky s po\u017eadovanou hr\u00fabkou zuba dostala do kontaktu s kolesom, \u010d\u00edm sa dosiahne po\u017eadovan\u00e1 v\u00f4\u013ea (obr. 1). T\u00fdmto sp\u00f4sobom je mo\u017en\u00e9 v\u00f4\u013eu pri mont\u00e1\u017ei ozuben\u00e9ho kolesa nastavi\u0165 na \u013eubovo\u013en\u00fa po\u017eadovan\u00fa hodnotu. Dokonca aj silne opotrebovan\u00e9 ozuben\u00e9 koles\u00e1 je mo\u017en\u00e9 jemne a plynule nastavi\u0165 bez zmeny geometrie kontaktu zubov alebo vytv\u00e1rania interferencie v z\u00e1bere \u2013 \u010do je k\u013e\u00fa\u010dov\u00e1 v\u00fdhoda oproti v\u0161etk\u00fdm alternat\u00edvnym met\u00f3dam regul\u00e1cie v\u00f4le.<\/p>\n

At the worm wheel, the different modules on each flank produce different addendum modification coefficients and different rolling circle diameters on the front side versus the rear side of each wheel tooth. Because of this asymmetry, the tooth profiles differ at the front and rear. However \u2014 and this is critical to understanding why duplex works \u2014 the thickness of each wheel tooth and the tooth gaps remain constant around the wheel circumference. This means the worm can shift to any axial position and the wheel tooth geometry is always correctly matched to the worm at that position. There is no “preferred” axial location with better contact than others \u2014 the contact quality is maintained uniformly across the full adjustment range.<\/p>\n

<\/p>\n

\u0160tyri alternat\u00edvne met\u00f3dy nastavenia v\u00f4le \u2013 pre\u010do ka\u017ed\u00e1 z nich zlyh\u00e1va<\/h2>\n

Predt\u00fdm, ako sa duplexn\u00e9 z\u00e1vitovkov\u00e9 prevody roz\u0161\u00edrili, in\u017einieri pou\u017e\u00edvali \u0161tyri in\u00e9 met\u00f3dy na regul\u00e1ciu v\u00f4le v z\u00e1vitovkov\u00fdch pohonoch. Pochopenie toho, \u010do je zl\u00e9 na ka\u017edej z t\u00fdchto alternat\u00edv, objas\u0148uje, pre\u010do je duplexn\u00e9 prevody vynikaj\u00facim rie\u0161en\u00edm pre aplik\u00e1cie presn\u00e9ho polohovania.<\/p>\n

\"\u0160trukt\u00fara<\/p>\n

\n\n\n\n\n\n\n\n\n
Alternat\u00edvna met\u00f3da<\/th>\nAko to funguje<\/th>\nPre\u010do je to problematick\u00e9<\/th>\n<\/tr>\n<\/thead>\n
Zmena vzdialenosti stredu excentrick\u00e9ho n\u00e1boja<\/td>\nZ\u00e1vitovkov\u00fd hriade\u013e aj hriade\u013e kolesa s\u00fa namontovan\u00e9 v excentrickom n\u00e1boji, ktor\u00fd sa ot\u00e1\u010da, aby sa zmenila stredov\u00e1 vzdialenos\u0165<\/td>\nPosunutie stredovej vzdialenosti men\u00ed kontaktn\u00fd vzor \u2013 z\u00e1vitovka a koleso boli navrhnut\u00e9 pre \u0161pecifick\u00fa stredov\u00fa vzdialenos\u0165 a odch\u00fdlka pos\u00fava kontaktn\u00fa z\u00f3nu smerom k hrotu alebo kore\u0148u zuba, \u010d\u00edm sa zmen\u0161uje kontaktn\u00e1 plocha a zvy\u0161uje sa koncentr\u00e1cia nap\u00e4tia na zuboch. \u00da\u010dinnos\u0165 sa zni\u017euje, preto\u017ee geometria olejov\u00e9ho filmu v z\u00e1bere je naru\u0161en\u00e1. Ka\u017ed\u00e9 nastavenie sp\u00f4sobuje zna\u010dn\u00e9 opotrebenie pri rozbehu, preto\u017ee novo umiestnen\u00e1 kontaktn\u00e1 z\u00f3na sa zabehne.<\/td>\n<\/tr>\n
Axi\u00e1lny posun ku\u017ee\u013eov\u00e9ho z\u00e1vitovky<\/td>\nZ\u00e1vitovka je vyroben\u00e1 s miernym z\u00fa\u017een\u00edm \u2013 s v\u00e4\u010d\u0161\u00edm priemerom na jednom konci \u2013 a axi\u00e1lne posunut\u00e1, aby sa s kolesom dostala do kontaktu \u010das\u0165 s r\u00f4znym priemerom.<\/td>\nKu\u017ee\u013eov\u00fd z\u00e1vitovn\u00edk men\u00ed efekt\u00edvny priemer rozstupu zubov pri svojom posune, \u010d\u00edm sa men\u00ed smer norm\u00e1ly kontaktu a uhol tlaku v mieste z\u00e1beru. To znamen\u00e1, \u017ee nastaven\u00fd pohon u\u017e nepracuje s kon\u0161truk\u010dn\u00fdm uhlom tlaku \u2013 za\u0165a\u017eenie na bokoch zubov sa men\u00ed a v z\u00e1va\u017en\u00fdch pr\u00edpadoch m\u00f4\u017ee geometria zubov sp\u00f4sobi\u0165 kontakt s hranou. V\u00fdroba spr\u00e1vne ku\u017ee\u013eov\u00e9ho z\u00e1vitovn\u00edka s po\u017eadovanou presnos\u0165ou profilu je tie\u017e technicky n\u00e1ro\u010dn\u00e1.<\/td>\n<\/tr>\n
Rozdelen\u00fd \u010derv \u2013 dve polovice (Ott syst\u00e9m)<\/td>\nZ\u00e1vitovka je rozdelen\u00e1 na dve polovice, ktor\u00e9 s\u00fa vo\u010di sebe oto\u010den\u00e9 alebo axi\u00e1lne posunut\u00e9, \u010do sp\u00f4sobuje zv\u00e4\u010d\u0161enie efekt\u00edvnej hr\u00fabky z\u00e1vitu.<\/td>\nRozdelenie z\u00e1vitovky vytv\u00e1ra geometrick\u00fa nepravidelnos\u0165 v rovine rozdelenia \u2013 profily z\u00e1vitov v mieste spoja nie s\u00fa s\u00favisl\u00e9. T\u00e1to nepravidelnos\u0165 sa prejavuje ako periodick\u00fd hluk a vibra\u010dn\u00fd v\u00fdkyv v\u017edy, ke\u010f rovina rozdelenia prech\u00e1dza cez sie\u0165. Zarovnanie dvoch polov\u00edc v mieste rozdelenia je kritick\u00e9 a pri prev\u00e1dzkovom za\u0165a\u017een\u00ed je \u0165a\u017ek\u00e9 ho udr\u017ea\u0165. Riziko nespr\u00e1vnej mont\u00e1\u017ee \u2013 jedna polovica oto\u010den\u00e1 o nespr\u00e1vny uhol \u2013 \u010do sp\u00f4sob\u00ed okam\u017eit\u00e9 po\u0161kodenie zubov, je vysok\u00e9.<\/td>\n<\/tr>\n
Delen\u00e9 koleso \u2013 dva disky<\/td>\nZ\u00e1vitovkov\u00e9 koleso je rozdelen\u00e9 na dva s\u00faosov\u00e9 disky, ktor\u00e9 s\u00fa vo\u010di sebe oto\u010den\u00e9 tak, aby efekt\u00edvna \u0161\u00edrka zuba vyp\u013a\u0148ala medzeru z\u00e1vitu z\u00e1vitovky s\u00fa\u010dasne z oboch str\u00e1n.<\/td>\nPodobne ako delen\u00e1 z\u00e1vitovka, aj dvojkot\u00fa\u010dov\u00e9 koleso zav\u00e1dza nerovnov\u00e1hu za\u0165a\u017eenia medzi dvoma kot\u00fa\u010dmi. Kot\u00fa\u010d, ktor\u00fd preber\u00e1 za\u0165a\u017eenie hnacieho boku, nesie pln\u00fd kr\u00fatiaci moment pri prvom kontakte; druh\u00fd kot\u00fa\u010d je za\u0165a\u017een\u00fd iba do tej miery, do akej jeho uhlov\u00e9 posunutie presne zodpoved\u00e1 prv\u00e9mu. V\u00fdroba a nastavenie tohto uhlov\u00e9ho vz\u0165ahu dostato\u010dne presne na rovnomern\u00e9 rozdelenie za\u0165a\u017eenia je mimoriadne n\u00e1ro\u010dn\u00e9. Zostava je tie\u017e inherentne tuh\u0161ia v kr\u00faten\u00ed a n\u00e1chylnej\u0161ia na trenie medzi plochami rozhrania kot\u00fa\u010da v kontaktnej z\u00f3ne.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

V\u0161etky \u0161tyri met\u00f3dy maj\u00fa rovnak\u00fd z\u00e1kladn\u00fd probl\u00e9m, ktor\u00fd je uveden\u00fd v technickej literat\u00fare: \u00dapravy a op\u00e4tovn\u00e9 \u00fapravy nar\u00fa\u0161aj\u00fa geometricky presn\u00e9 zapojenie. Pos\u00favaj\u00fa kontaktn\u00fa profilov\u00fa z\u00f3nu a menia jej tvar a ve\u013ekos\u0165. T\u00fdm zni\u017euj\u00fa nosnos\u0165 a zhor\u0161uj\u00fa \u00fa\u010dinnos\u0165. Ka\u017ed\u00e9 nastavenie sp\u00f4sobuje zna\u010dn\u00e9 opotrebenie pri rozbehu. Riziko nespr\u00e1vnej mont\u00e1\u017ee a zni\u010denia z\u00e1vitovkov\u00e9ho prevodu je zna\u010dn\u00e9.<\/em><\/p>\n

Dvojit\u00e9 z\u00e1vitovkov\u00e9 prevody nesp\u00f4sobuj\u00fa \u017eiadny z t\u00fdchto probl\u00e9mov. V\u017edy umo\u017e\u0148uj\u00fa geometricky presn\u00fd kontakt zubov a ve\u013emi jemn\u00e9 nastavenie v\u00f4le. Kontaktn\u00e1 plocha, nosnos\u0165 a skuto\u010dn\u00e1 \u00fa\u010dinnos\u0165 nie s\u00fa nastaven\u00edm ovplyvnen\u00e9. Okrem toho, preto\u017ee dvojzubov\u00e9 zuby s\u00fa vyroben\u00e9 s evolventn\u00fdm tvarom zubov, nie s\u00fa citliv\u00e9 na zmeny stredovej vzdialenosti \u2013 napr\u00edklad sp\u00f4soben\u00e9 vych\u00fdlen\u00edm z\u00e1vitovkov\u00e9ho hriade\u013ea pri za\u0165a\u017een\u00ed \u2013 \u010do je \u010fal\u0161ia v\u00fdhoda spo\u013eahlivosti pri vysoko za\u0165a\u017een\u00fdch presn\u00fdch pohonoch.<\/p>\n

<\/p>\n

\n
<\/div>\n<\/div>\n

Duplex verzus alternat\u00edvy \u2013 \u010do sa zmen\u00ed po \u00faprave v\u00f4le<\/h2>\n

This comparison is the core engineering argument for specifying duplex in precision drives. The “after adjustment” column captures what actually happens to the drive after each backlash readjustment \u2014 the information that determines whether the drive will maintain its positioning accuracy specification over repeated adjustments during service life.<\/p>\n

\"Valcov\u00e9<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n
Faktor<\/th>\nDuplexn\u00fd z\u00e1vitovkov\u00fd syst\u00e9m (axi\u00e1lny posun)<\/th>\nExcentrick\u00fd n\u00e1boj (posun do stredu)<\/th>\nRozdelen\u00fd z\u00e1vitovkov\u00fd syst\u00e9m \/ Rozdelen\u00e9 koleso<\/th>\n<\/tr>\n<\/thead>\n
Geometria kontaktu po nastaven\u00ed<\/strong><\/td>\nNezmenen\u00e9 \u2013 geometricky presn\u00e9 vo v\u0161etk\u00fdch poloh\u00e1ch<\/td>\nPosunut\u00e9 smerom ku hrotu alebo kore\u0148u \u2013 zmen\u0161en\u00e1 kontaktn\u00e1 plocha<\/td>\nPeriodick\u00e1 nepravidelnos\u0165 v rozdelenej rovine \u2013 vibra\u010dn\u00fd impulz<\/td>\n<\/tr>\n
Nosnos\u0165 po nastaven\u00ed<\/strong><\/td>\nNeovplyvnen\u00e9 \u2013 rovnak\u00e9 ako pred \u00fapravou<\/td>\nZn\u00ed\u017een\u00e1 \u2014 men\u0161ia efekt\u00edvna kontaktn\u00e1 plocha<\/td>\nZn\u00ed\u017een\u00e1 nerovnov\u00e1ha za\u0165a\u017eenia medzi rozdelen\u00fdmi polovicami<\/td>\n<\/tr>\n
Nastavenie opotrebenia pri rozbehu<\/strong><\/td>\n\u017diadne \u2013 plynul\u00e9 premiestnenie, \u017eiadna nov\u00e1 kontaktn\u00e1 z\u00f3na<\/td>\nV\u00fdznamn\u00e9 \u2013 zaka\u017ed\u00fdm sa mus\u00ed vytvori\u0165 nov\u00e1 kontaktn\u00e1 z\u00f3na<\/td>\nV\u00fdznamn\u00e1 \u2013 nerovnomernos\u0165 rozdelenej roviny sp\u00f4sobuje prudk\u00fd n\u00e1rast opotrebenia<\/td>\n<\/tr>\n
Citlivos\u0165 na stredov\u00fa vzdialenos\u0165<\/strong><\/td>\nNecitliv\u00fd \u2013 evolventn\u00fd tvar umo\u017e\u0148uje zmenu stredovej vzdialenosti<\/td>\nCitliv\u00e9 \u2013 mus\u00ed sa presne vr\u00e1ti\u0165 do projektovanej stredovej vzdialenosti<\/td>\nCitliv\u00e9 \u2013 uhlov\u00e9 zarovnanie polov\u00edc mus\u00ed by\u0165 presn\u00e9<\/td>\n<\/tr>\n
Opakovate\u013enos\u0165 nastavenia<\/strong><\/td>\nVynikaj\u00face \u2013 rovnak\u00fd axi\u00e1lny posun zaka\u017ed\u00fdm obnov\u00ed rovnak\u00fa v\u00f4\u013eu<\/td>\nVariabiln\u00e1 \u2013 excentrick\u00e1 poloha mus\u00ed by\u0165 presne nastaven\u00e1 a zaisten\u00e1<\/td>\nSlab\u00e9 \u2013 zarovnanie v polovi\u010dnej polohe je \u0165a\u017ek\u00e9 opakova\u0165<\/td>\n<\/tr>\n
Riziko mont\u00e1\u017ee<\/strong><\/td>\nN\u00edzke \u2013 jasn\u00e9 \u0161\u00edpky zabra\u0148uj\u00fa nespr\u00e1vnej orient\u00e1cii<\/td>\nMierne \u2013 excentrick\u00fd z\u00e1mok mus\u00ed by\u0165 spr\u00e1vne nastaven\u00fd<\/td>\nVysok\u00e1 \u2013 nespr\u00e1vna polovi\u010dn\u00e1 rot\u00e1cia sp\u00f4sobuje okam\u017eit\u00e9 po\u0161kodenie zubov<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

<\/p>\n

D\u00f4le\u017eit\u00e9 mont\u00e1\u017ene pokyny \u2013 Pre\u010d\u00edtajte si ich pred in\u0161tal\u00e1ciou<\/h2>\n

Dvojit\u00e9 z\u00e1vitovkov\u00e9 prevody sa l\u00ed\u0161ia modulom medzi pravou a \u013eavou stranou zubov. T\u00e1to asymetria znamen\u00e1, \u017ee sada m\u00e1 \u0161pecifick\u00fa spr\u00e1vnu orient\u00e1ciu \u2013 a iba jednu spr\u00e1vnu orient\u00e1ciu. In\u0161tal\u00e1cia z\u00e1vitovky v nespr\u00e1vnom smere sp\u00f4sob\u00ed, \u017ee stredov\u00e1 vzdialenos\u0165 bude v\u00e4\u010d\u0161ia ako nomin\u00e1lna, \u010do s\u0165a\u017euje mont\u00e1\u017e a sp\u00f4sobuje nespr\u00e1vny z\u00e1ber zubov, ktor\u00fd sa ned\u00e1 opravi\u0165 axi\u00e1lnym nastaven\u00edm. Pred mont\u00e1\u017eou si overte oba aspekty uveden\u00e9 ni\u017e\u0161ie.<\/p>\n

\"\"<\/p>\n

1. Overenie orient\u00e1cie zostavy<\/h3>\n

An arrow indicating the correct orientation of assembly is stamped on both the duplex worm and the worm wheel. When assembling, position the worm wheel so that its arrow mark faces toward the front (toward you). Orient the worm so that the direction of its arrow mark coincides with the direction of the wheel’s arrow mark \u2014 both arrows pointing the same way. Should the assembly be incorrect, the center distance “a” will become greater than the nominal design value, resulting in difficulty completing the assembly and, if forced, improper gear engagement that produces excessive noise, vibration, and accelerated tooth wear from the first revolution.<\/p>\n

\"kon\u0161trukcia<\/p>\n

2. Overenie referen\u010dnej polohy pre nulov\u00fa v\u00f4\u013eu<\/h3>\n

A V-groove (60\u00b0, 0.3 mm deep) machined on the tip peripheral of one specific duplex worm tooth marks the reference tooth. This reference tooth is the tooth at the axial position that produces near-zero backlash (\u00b10.045 mm) when positioned in alignment with the center of rotation of the worm wheel, with the center distance set at the nominal design value “a.” The procedure for setting zero backlash is: (1) set the housing center distance to the nominal value “a”; (2) rotate the worm until the V-groove reference tooth is aligned with the wheel’s rotation axis; (3) lock the worm housing or bearing adjustment at this position. For applications requiring slightly positive backlash (to accommodate thermal expansion or to prevent tooth binding under load), shift the worm axially toward the thin end by the calculated amount before locking.<\/p>\n

\u2691 Servisn\u00e1 pozn\u00e1mka:<\/span> Ke\u010f sa ozuben\u00e9 koleso po\u010das prev\u00e1dzky opotrebuje a v\u00f4\u013ea sa zv\u00e4\u010d\u0161uje, posu\u0148te z\u00e1vitovku axi\u00e1lne smerom k hrub\u0161iemu koncu o po\u017eadovan\u00fa hodnotu (vypo\u010d\u00edtan\u00fa zo \u0161pecifik\u00e1cie rozdielu predstihu dodanej s ka\u017edou sadou). Toto nastavenie obnov\u00ed p\u00f4vodn\u00fa takmer nulov\u00fa v\u00f4\u013eu bez demont\u00e1\u017ee prevodovky \u2013 vo v\u00e4\u010d\u0161ine kon\u0161trukci\u00ed je axi\u00e1lna poloha z\u00e1vitovkov\u00e9ho hriade\u013ea nastavite\u013en\u00e1 pomocou z\u00e1vitov\u00e9ho koncov\u00e9ho uz\u00e1veru alebo podlo\u017eky. Po ka\u017edom nastaven\u00ed znovu kalibrujte pr\u00edstroj na meranie v\u00f4le, aby ste pred op\u00e4tovn\u00fdm uveden\u00edm stroja do prev\u00e1dzky potvrdili obnoven\u00fa hodnotu.<\/p>\n

<\/p>\n

Aplik\u00e1cie \u2013 kde je kontrola v\u00f4le kritick\u00e1 z h\u013eadiska bezpe\u010dnosti alebo obmedzuje presnos\u0165<\/h2>\n

Duplex worm gears are specified wherever backlash is unwanted or can be harmful: to maintain repeated high-precision positioning in both directions, to prevent impulse-loaded damage when contact flanks alternate, and in drives where positioning error accumulates over time. Typical applications include rotary and tilting tables, milling machines, and presses. The following examples provide the engineering context for each application’s specific backlash requirement.<\/p>\n