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A cycloidal reducer is a type of gear reducer. The essential operation is an insight shaft connects to and drives an eccentric bearing. This bearing additional drives a cycloidal disk (sometimes referred to as a cam) that connects to an result shaft.

cycloidal reducer
Typical cycloidal speed reducers, such as these Dojen series Cycloidal Reducer reducers from Onvio, provide zero backlash by combining a substance reduction cam with preloaded, full 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. That is especially in demand where highly precise and accurate positioning is required, for instance in robotic applications, machine equipment, and comparable applications. Cycloidal reducers also feature rolling instead of sliding contact, therefore experiencing less overall wear.