Dual drive systems often have two drives that rotate at different speeds; these are referred to as two speed drive systems. In a two speed drive system, it is common to operate at two different speeds; high speed and low speed.

The overrunning clutch engages machines or machine parts and automatically interrupts their contact as soon as the driven part of the overrunning clutch is turned faster than the driving part.

The overrunning clutch / Coupling can be used to connect dual drives where there are two alternative motors driving a common gearbox input shaft, for example. The inner/Outer race should normally be mounted on the shaft which will be running for long periods at a relatively high speed, while the outer/Inner race is stationery. A clutch should be used when higher over running speeds are required and / or maintenance will be infrequent. With overrunning clutches the engagement takes place in the driving operation (torque transmission), while in freewheeling operation the torque transmission between the inner and outer ring is interrupted. In driving operation the speeds of the inner and outer ring are equal, while in free - wheeling operation they are different.

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