A Oil less Air Compressor cycloidal reducer is a kind of gear reducer. The essential operation is an input shaft connects to and drives an eccentric bearing. This bearing further drives a cycloidal disk (sometimes referred to as a cam) that connects to an output shaft.

cycloidal reducer
Standard cycloidal speed reducers, such as these Dojen series reducers from Onvio, offer zero backlash by combining a compound reduction cam with preloaded, complete compliment needle bearing cam followers.

The cycloidal disk (or cam) has lobes or teeth that engage with some type of cam follower, typically a pin or needle bearings. The eccentric rotation of the cam is usually transformed into rotation of an output shaft at a reduced speed and a rise in torque.

The main advantage of cycloidal reducers is their house of zero or near-zero backlash, which results in high precision and high accuracy. This is especially in demand where highly specific and accurate positioning is required, for instance in robotic applications, machine equipment, and comparable applications. Cycloidal reducers also feature rolling as opposed to sliding contact, therefore experiencing less overall wear.