Functional Principle

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Freewheels are directional couplings, which means that the driving member rotates the driven member in one direction, while automatically disengaging itself from the driven part when the direction of rotation is reversed.
The two operating states are Transmission of torque and Idling (Overrunning).
Freewheels may be employed as:



Overrunning clutch
The freewheel disengages automatically when the driven member rotates faster than the driving member.


Indexing clutch
The freewheel allows the conversion of a reciprocating motion into a rotational movement.


Backstop
The freewheel allows rotation in one direction only. It overruns continuously during operation. The freewheel prevents reverse rotation if the drive is disconnected.