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Transmission and transfer case » Automatic transmission-30RH » Description and operation
Overrunning clutch

DESCRIPTION

The overrunning clutch (Fig. 45) consists of an inner race, an outer race (or cam), rollers and springs, and the spring retainer. The number of rollers and springs depends on what transmission and which overrunning clutch is being dealt with.

Fig. 45 Overrunning Clutch
Fig. 45 Overrunning Clutch

1 - OUTER RACE (CAM)
2 - ROLLER
3 - SPRING
4 - SPRING RETAINER
5 - INNER RACE (HUB)

OPERATION

As the inner race is rotated in a clockwise direction (as viewed from the front of the transmission), the race causes the rollers to roll toward the springs, causing them to compress against their retainer. The compression of the springs increases the clearance between the rollers and cam. This increased clearance between the rollers and cam results in a freewheeling condition. When the inner race attempts to rotate counterclockwise, the action causes the rollers to roll in the same direction as the race, aided by the pushing of the springs. As the rollers try to move in the same direction as the inner race, they are wedged between the inner and outer races due to the design of the cam. In this condition, the clutch is locked and acts as one unit.

    More about «Description and operation»:

    30RH automatic transmission

    Fluid

    Torque converter

    Oil pump

    Valve body

    Accumulator

    Pistons

    Front clutch

    Rear clutch

    Overrunning clutch

    Planetary gearset

    Bands

    Servos

    Governor

    Gearshift mechanism

    Converter drainback valve

    Brake transmission shift interlock mechanism

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