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Cycloidal gearboxes
Cycloidal gearboxes or reducers contain four basic components: a high-speed input shaft, an individual or substance cycloidal cam, cam Cycloidal gearbox followers or rollers, and a slow-speed output shaft. The insight shaft attaches to an eccentric drive member that induces eccentric rotation of the cycloidal cam. In substance reducers, the first track of the cycloidal cam lobes engages cam fans in the housing. Cylindrical cam followers act as teeth on the internal gear, and the number of cam supporters exceeds the number of cam lobes. The next track of substance cam lobes engages with cam supporters on the output shaft and transforms the cam’s eccentric rotation into concentric rotation of the output shaft, thus increasing torque and reducing velocity.

Compound cycloidal gearboxes provide ratios ranging from only 10:1 to 300:1 without stacking levels, as in standard planetary gearboxes. The gearbox’s compound decrease and may be calculated using:

where nhsg = the amount of followers or rollers in the fixed housing and nops = the number for followers or rollers in the sluggish speed output shaft (flange).

There are several commercial variations of cycloidal reducers. And unlike planetary gearboxes where variations derive from gear geometry, heat therapy, and finishing procedures, cycloidal variations share basic design principles but generate cycloidal motion in different ways.
Planetary gearboxes
Planetary gearboxes are made up of three basic force-transmitting elements: a sun gear, three or even more satellite or world gears, and an interior ring gear. In a typical gearbox, the sun equipment attaches to the insight shaft, which is linked to the servomotor. The sun gear transmits motor rotation to the satellites which, subsequently, rotate within the stationary ring equipment. The ring equipment is part of the gearbox housing. Satellite gears rotate on rigid shafts linked to the planet carrier and cause the earth carrier to rotate and, thus, turn the output shaft. The gearbox gives the output shaft higher torque and lower rpm.