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 further drives a cycloidal disk (sometimes known as a cam) that connects to an output shaft.
cycloidal reducer
Typical cycloidal speed reducers, such as for example 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 China Air Compressor engage with some form of 
cam follower, typically a pin or needle bearings. The eccentric rotation of the cam can be changed into rotation of an output shaft at a lower life expectancy speed and an increase in torque.
The main advantage of cycloidal reducers is their house of zero or near-zero backlash, which translates into high precision and high accuracy. This is especially popular where highly precise and accurate positioning is necessary, for instance in robotic applications, machine tools, and comparable applications. Cycloidal reducers also feature rolling as opposed to sliding contact, therefore experiencing less overall put on.
