A cycloidal drive or cycloidal speed reducer is a mechanism for reducing the rate of an planetary gearbox insight shaft by a specific ratio. Cycloidal quickness reducers are capable of relatively high ratios in small sizes. [1]
The input shaft drives an eccentric bearing that subsequently drives the cycloidal disc in an eccentric, cycloidal movement. The perimeter of this disc is targeted at a stationary ring equipment and has a series of result shaft 
pins or rollers positioned through the facial skin of the disc. These result shaft pins directly drive the output shaft as the cycloidal disc rotates. The radial motion of the disc isn’t translated to the output shaft.