Product Description:
A worm gear is a type of staggered shaft gear that transmits motion between two shafts that are neither intersecting nor parallel. Even though it is compact it can provide a large speed reduction.
A 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. The set of a worm and worm wheel is called a worm gear.
Its history is so old that its existence is described by Archimedes in around 250 BC.
There are roughly two types of worm gears.
One is a cylindrical worm that meshes with a worm wheel as a pair to form the "cylindrical worm gear".
The other is the "drum-shaped worm gear" which is a pair consisting of a drum-shaped worm and a worm wheel.
The latter type is also called "throated worm gear".
When a worm gear is used, a compact and high speed reduction ratio can be obtained as compared with spur gears.
The reduction ratio is determined by the combination of the number of worm threads and the number of teeth on the worm wheel. 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.
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