{"id":1773,"date":"2026-04-07T08:29:37","date_gmt":"2026-04-07T08:29:37","guid":{"rendered":"https:\/\/wormwheelgear.top\/?post_type=product&p=1773"},"modified":"2026-04-08T06:02:44","modified_gmt":"2026-04-08T06:02:44","slug":"worm-and-wheel-module-m3-m12-ratio-201-3001-line-contact-transmission","status":"publish","type":"product","link":"https:\/\/wormwheelgear.top\/hi\/product\/worm-and-wheel-module-m3-m12-ratio-201-3001-line-contact-transmission\/","title":{"rendered":"\u0935\u0930\u094d\u092e \u0914\u0930 \u0935\u094d\u0939\u0940\u0932 | \u092e\u0949\u0921\u094d\u092f\u0942\u0932 M3\u2013M12, \u0905\u0928\u0941\u092a\u093e\u0924 20:1\u2013300:1, \u0932\u093e\u0907\u0928 \u0938\u0902\u092a\u0930\u094d\u0915 \u0938\u0902\u091a\u0930\u0923"},"content":{"rendered":"
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\u0909\u0924\u094d\u092a\u093e\u0926 \u0905\u0935\u0932\u094b\u0915\u0928<\/h2>\n

<\/p>\n

A worm transmission achieves what no other single-stage gear arrangement can: a high reduction ratio \u2014 typically 20:1, sometimes exceeding 300:1 \u2014 in a 90\u00b0 shaft layout within a compact housing. The physics that make this possible also create its most important operational property. The worm thread’s lead angle is shallow \u2014 typically 3\u00b0 to 11\u00b0 for ratios above 10:1. When the wheel attempts to drive the worm back, the friction force at the mesh interface (even with oil lubrication) exceeds the tangential force component trying to rotate the worm, and the drive locks in place. This self-locking is not a design add-on; it is a natural consequence of the geometry. Korea Ever-Power Worm Gear Co., Ltd supplies these worm and wheel<\/a> sets from module M3 to M12 across a full material range for industrial, medical, agricultural, and transport applications.<\/p>\n

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Product Parameters<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u092a\u0948\u0930\u093e\u092e\u0940\u091f\u0930<\/th>\n\u0915\u0940\u092e\u0924<\/th>\n<\/tr>\n<\/thead>\n
\u092e\u0949\u0921\u0932 \u0938\u0902\u0916\u094d\u092f\u093e<\/td>\n\u090f\u092e3, \u090f\u092e4, \u090f\u092e5, \u090f\u092e8, \u090f\u092e12 \u0914\u0930 \u0915\u0938\u094d\u091f\u092e \u092e\u0949\u0921\u094d\u092f\u0942\u0932<\/td>\n<\/tr>\n
\u0938\u093e\u092e\u0917\u094d\u0930\u0940<\/td>\n\u092a\u0940\u0924\u0932, C45 \u0938\u094d\u091f\u0940\u0932, \u0938\u094d\u091f\u0947\u0928\u0932\u0947\u0938 \u0938\u094d\u091f\u0940\u0932, \u0924\u093e\u0902\u092c\u093e, POM, \u090f\u0932\u094d\u092f\u0941\u092e\u0940\u0928\u093f\u092f\u092e, \u092e\u093f\u0936\u094d\u0930 \u0927\u093e\u0924\u0941 \u0914\u0930 \u0905\u0928\u094d\u092f<\/td>\n<\/tr>\n
\u0938\u0924\u0939 \u0915\u093e \u0909\u092a\u091a\u093e\u0930<\/td>\n\u091c\u093f\u0902\u0915 \u092a\u094d\u0932\u0947\u091f\u0947\u0921, \u0928\u093f\u0915\u0947\u0932 \u092a\u094d\u0932\u0947\u091f\u0947\u0921, \u092a\u0948\u0938\u093f\u0935\u0947\u0936\u0928, \u0911\u0915\u094d\u0938\u0940\u0915\u0930\u0923, \u090f\u0928\u094b\u0921\u093e\u0907\u091c\u0947\u0936\u0928, \u091c\u093f\u092f\u094b\u092e\u0947\u091f, \u0921\u0948\u0915\u094d\u0930\u094b\u092e\u0947\u091f, \u092c\u094d\u0932\u0948\u0915 \u0911\u0915\u094d\u0938\u093e\u0907\u0921, \u092b\u0949\u0938\u094d\u092b\u0947\u091f\u093e\u0907\u091c\u093f\u0902\u0917, \u092a\u093e\u0909\u0921\u0930 \u0915\u094b\u091f\u093f\u0902\u0917, \u0907\u0932\u0947\u0915\u094d\u091f\u094d\u0930\u094b\u092b\u094b\u0930\u0947\u0938\u093f\u0938<\/td>\n<\/tr>\n
\u092e\u093e\u0928\u0915<\/td>\n\u0906\u0908\u090f\u0938\u0913, \u0921\u0940\u0906\u0908\u090f\u0928, \u090f\u090f\u0928\u090f\u0938\u0906\u0908, \u091c\u0947\u0906\u0908\u090f\u0938, \u092c\u0940\u090f\u0938 \u0914\u0930 \u0917\u0948\u0930-\u092e\u093e\u0928\u0915<\/td>\n<\/tr>\n
\u0936\u0941\u0926\u094d\u0927\u0924\u093e<\/td>\n\u0921\u0940\u0906\u0908\u090f\u09286, \u0921\u0940\u0906\u0908\u090f\u09287, \u0921\u0940\u0906\u0908\u090f\u09288, \u0921\u0940\u0906\u0908\u090f\u09289<\/td>\n<\/tr>\n
\u0926\u093e\u0902\u0924\u094b\u0902 \u0915\u093e \u0909\u092a\u091a\u093e\u0930<\/td>\n\u0915\u0920\u094b\u0930, \u092a\u093f\u0938\u093e \u0939\u0941\u0906 \u092f\u093e \u0917\u0942\u0902\u0925\u093e \u0939\u0941\u0906<\/td>\n<\/tr>\n
\u0938\u0939\u0928\u0936\u0940\u0932\u0924\u093e<\/td>\n0.001 \u092e\u093f\u092e\u0940 \u2013 0.01 \u092e\u093f\u092e\u0940 \u2013 0.1 \u092e\u093f\u092e\u0940<\/td>\n<\/tr>\n
\u0916\u0924\u094d\u092e \u0915\u0930\u0928\u093e<\/td>\n\u0936\u0949\u091f\/\u0938\u0948\u0902\u0921 \u092c\u094d\u0932\u093e\u0938\u094d\u091f, \u0939\u0940\u091f \u091f\u094d\u0930\u0940\u091f\u092e\u0947\u0902\u091f, \u090f\u0928\u0940\u0932\u093f\u0902\u0917, \u091f\u0947\u092e\u094d\u092a\u0930\u093f\u0902\u0917, \u092a\u0949\u0932\u093f\u0936\u093f\u0902\u0917, \u090f\u0928\u094b\u0921\u093e\u0907\u091c\u093f\u0902\u0917, \u091c\u093f\u0902\u0915-\u092a\u094d\u0932\u0947\u091f\u0947\u0921<\/td>\n<\/tr>\n
\u0935\u0938\u094d\u0924\u0941\u0913\u0902 \u0915\u0940 \u092a\u0948\u0915\u093f\u0902\u0917<\/td>\n\u092a\u094d\u0932\u093e\u0938\u094d\u091f\u093f\u0915 \u092c\u0948\u0917 + \u0915\u093e\u0930\u094d\u091f\u0928 \u092f\u093e \u0932\u0915\u0921\u093c\u0940 \u0915\u0940 \u092a\u0948\u0915\u093f\u0902\u0917<\/td>\n<\/tr>\n
\u092d\u0941\u0917\u0924\u093e\u0928 \u0915\u0940 \u0936\u0930\u094d\u0924\u0947\u0902<\/td>\n\u091f\u0940\/\u091f\u0940, \u090f\u0932\/\u0938\u0940<\/td>\n<\/tr>\n
\u0909\u0924\u094d\u092a\u093e\u0926\u0928 \u0932\u0940\u0921 \u091f\u093e\u0907\u092e<\/td>\n20 \u0915\u093e\u0930\u094d\u092f\u0926\u093f\u0935\u0938 (\u0928\u092e\u0942\u0928\u093e); 25 \u0926\u093f\u0928 (\u0925\u094b\u0915)<\/td>\n<\/tr>\n
\u0928\u092e\u0942\u0928\u0947<\/td>\nSample fee $2\u2013$100; freight on buyer’s account; fee credited on production order<\/td>\n<\/tr>\n
\u0906\u0935\u0947\u0926\u0928<\/td>\n\u0938\u094d\u0935\u091a\u093e\u0932\u093f\u0924 \u0928\u093f\u092f\u0902\u0924\u094d\u0930\u0923 \u092e\u0936\u0940\u0928\u0947\u0902, \u0938\u0947\u092e\u0940\u0915\u0902\u0921\u0915\u094d\u091f\u0930 \u0909\u0926\u094d\u092f\u094b\u0917, \u0938\u093e\u092e\u093e\u0928\u094d\u092f \u0914\u0926\u094d\u092f\u094b\u0917\u093f\u0915 \u092e\u0936\u0940\u0928\u0930\u0940, \u091a\u093f\u0915\u093f\u0924\u094d\u0938\u093e \u0909\u092a\u0915\u0930\u0923, \u0938\u094c\u0930 \u090a\u0930\u094d\u091c\u093e \u0909\u092a\u0915\u0930\u0923, \u092e\u0936\u0940\u0928 \u091f\u0942\u0932\u094d\u0938, \u092a\u093e\u0930\u094d\u0915\u093f\u0902\u0917 \u0938\u093f\u0938\u094d\u091f\u092e, \u0939\u093e\u0908-\u0938\u094d\u092a\u0940\u0921 \u0930\u0947\u0932 \u0914\u0930 \u0935\u093f\u092e\u093e\u0928\u0928 \u092a\u0930\u093f\u0935\u0939\u0928 \u0909\u092a\u0915\u0930\u0923<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

<\/p>\n

Worm Transmission Engineering \u2014 Ratio, Self-Locking, and Efficiency Explained<\/h2>\n

Worm transmission is composed of a worm (resembling a threaded bolt) and a worm wheel (similar to a helical spur gear), used to transfer motion and power between two staggered shafts. The shaft angle is generally 90\u00b0. In standard worm drives, the worm is the driving part. The worm’s appearance is similar to a bolt; the worm wheel is similar to a helical spur gear. During work, the worm wheel teeth slide and roll along the spiral surface of the worm. To improve the contact condition, the worm wheel is formed with a circular-arc tooth width so it partially envelops the worm \u2014 this creates line contact rather than point contact, and raises the admissible load significantly.<\/p>\n

Ratio Calculation \u2014 Worked Examples<\/h3>\n

Gear ratio = wheel tooth count \u00f7 worm start count. This is straightforward but its implications for ratio range are significant:<\/p>\n

\n\n\n\n\n\n\n\n\n\n
Wheel Teeth (Z)<\/th>\nWorm Starts (n)<\/th>\nRatio (Z \u00f7 n)<\/th>\nOutput RPM at 1,440 RPM input<\/th>\nSelf-locking?<\/th>\n<\/tr>\n<\/thead>\n
20<\/td>\n1<\/td>\n20:1<\/td>\n72 RPM<\/td>\nYes (typical)<\/td>\n<\/tr>\n
40<\/td>\n1<\/td>\n40:1<\/td>\n36 RPM<\/td>\nYes (strong)<\/td>\n<\/tr>\n
40<\/td>\n2<\/td>\n20:1<\/td>\n72 RPM<\/td>\nMarginal (check friction angle)<\/td>\n<\/tr>\n
60<\/td>\n1<\/td>\n60:1<\/td>\n24 RPM<\/td>\nYes (very strong)<\/td>\n<\/tr>\n
100<\/td>\n1<\/td>\n100:1<\/td>\n14.4 RPM<\/td>\nYes \u2014 also very low efficiency (\u224850\u201360%)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Self-Locking \u2014 When It Works and When It Fails<\/h3>\n

Self-locking occurs when the worm lead angle (\u03bb) is smaller than the effective friction angle (\u03c1’) at the mesh. The effective friction angle depends on the lubrication condition and the contact surface finish. A well-lubricated mesh with high-additive oil has a lower friction angle than a dry or minimally lubricated mesh \u2014 meaning self-locking that is reliable without lubrication may become unreliable with high-quality synthetic gear oil. This is a known and important failure mode in hoists and safety devices that rely on worm drive self-locking. Designers must verify the friction angle under the actual lubrication and temperature conditions of service, not just the dry condition.<\/p>\n

For worm drives used in hoists, elevators, or safety-critical holding applications where the load must not fall under any condition, the lead angle should be at least 3\u20135\u00b0 below the friction angle at the lowest expected oil viscosity and highest operating temperature. If in doubt, use a single-start worm (higher lead angle provides stronger locking), specify a higher-viscosity oil, or add a secondary mechanical brake.<\/p>\n

\"\"<\/p>\n

Efficiency \u2014 What the Numbers Mean in Practice<\/h3>\n

Worm drive efficiency is typically 70\u201390% for standard single-start configurations, falling to 50\u201365% at high ratios (60:1 and above). The friction loss generates heat at the mesh zone. This has three practical design implications:<\/p>\n