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Worm gear design calculation pdf printer11/14/2022 ![]() ![]() are used for worms, while cast iron (FC200), phosphor bronze and aluminum bronze, and MC nylon (an engineering plastic) are used for the worm wheel. To reduce wear, worms are generally made of a harder material than worm wheels.įor KHK standard gears, mechanical structural carbon steel (S45C), mechanical structural alloy steel (SCM440), stainless steel, etc. Worm gears have advantages such as low noise and low vibration, but because power transmission is effected by sliding contact, it also has the disadvantage of retaining heat and its transmission efficiency is not high (in the case of a cylindrical worm gear, the general efficiency is about 30 - 60%). For example, in the case of the worm gears of the KHK's standard gears, a reduction ratio of up to the maximum of 1/120 can be obtained. The reduction ratio is determined by the combination of the number of worm threads and the number of teeth on the worm wheel. ![]() When a worm gear is used, a compact and high speed reduction ratio can be obtained as compared with spur gears. ![]() The latter type is also called "throated worm gear". The other is the "drum-shaped worm gear" which is a pair consisting of a drum-shaped worm and a worm wheel. One is a cylindrical worm that meshes with a worm wheel as a pair to form the "cylindrical worm gear". There are roughly two types of worm gears. ![]() Its history is so old that its existence is described by Archimedes in around 250 BC. The set of a worm and worm wheel is called a worm gear. Even though it is compact it can provide a large speed reduction.Ī worm gear is a thread cut into a round bar, and a worm wheel is a gear that meshes with the worm at a shaft angle of 90 degrees. A worm gear is a type of staggered shaft gear that transmits motion between two shafts that are neither intersecting nor parallel. ![]()
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