Worm and worm gears are usually used where large speed reductions are required. The reduction ratio depends on the number of heads of the worm and the number of teeth of the worm gear. Because the worm and worm wheel are in sliding contact, there is a silent transmission side, but at the same time, the sliding contact is easy to generate heat, and the transmission efficiency is low.

Generally speaking, the material of worm and worm wheel products is that the worm is made of hard metal, while the worm wheel is made of relatively soft metal such as aluminum bronze. This is because the number of teeth of the worm wheel is larger than that of a worm having a head number of 1-4. By reducing the hardness of the worm wheel, the tooth friction of the worm can be reduced. Another feature of worm manufacturing is the need for dedicated gear cutting and gear grinding equipment. On the other hand, worm gears can be produced using spur gear hobbing machines. However, due to the different tooth profiles, the worm gear cannot stack several blanks like a spur gear to simultaneously perform longitudinal gear cutting.

Enumerating the application examples of worm and worm gear, the most easy to think of is the gear box. There are also fishing rod spools and guitar string tuning knobs that are relatively easy to touch in our lives. There are also many parts that use large reduction ratios for fine adjustment. In addition, although the worm wheel can be driven by the worm, in most cases, the worm wheel cannot be driven by the worm wheel. This phenomenon is called self-locking. However, self-locking is not a method that can completely guarantee the prevention of reversal. If it is necessary to completely prevent reversal, it should be used in conjunction with other methods.

There is also a type called a double-lead worm gear. The purpose of using this type of worm gear is to adjust the backlash. When the gear teeth are worn, the double-lead worm wheel can adjust the backlash of the worm wheel without changing the center distance. There are not many manufacturers that can produce this type of worm wheel.

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