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Dec 21, 2018

Internal gears are cylindrical gear ring with teeth formed at the inner diameter. Internal gears mesh with spur gears. There are two types of tooth trace, one is parallel and other is helix to axis. However gear with parallel axis has higher demand.

Planetary gear mechanism

The most popular demand for internal gears is usage for mechanism of planetary gear train composed of carrier, several spur gears that is called planet gear and sun gear and one internal gear.

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