Overrunning clutch is also called one-way overrunning clutch or freewheel clutch. The difference from other clutches is that one-way overrunning clutch does not need a control mechanism. It relies on its one-way locking principle to play a fixed or connecting role. The transmission of torque is single Directional, its connection and fixation are completely determined by the force direction of the connected element. When the force direction of the connected element is the same as the locking direction, the element is fixed or connected; when the force direction When it is opposite to the locking direction, the component is released or disconnected; that is, between the drive shaft and the driven shaft, the driven shaft can only be rotated in one direction, and the opposite direction has the idling function.