Rear clutch RC

When pressurized, fluid is released from the front clutch piston chamber, and is transferred to the rear clutch piston chamber. The servo piston will be forced directly against the end plate of the rear clutch multiplate pack. This compresses the release spring and sandwiches the drive and driven plates together so that the secondary sun gear will now be locked to the input turbine shaft. Torque can now be transmitted from the input turbine shaft to the secondary sun gear.

2.12 Semicentrifugal clutch (Figs 2.17 and 2.18) With this design of clutch lighter pressure plate springs are used for a given torque carrying capacity, making it easier to engage the clutch in the lower speed range, the necessary extra clamping thrust being supplemented by the centrifugal force at higher speeds.

The release levers are made with offset bob weights at their outer ends, so that they are centri-fugally out of balance (Fig. 2.17). The movement due to the centrifugal force about the fixed pivot tends to force the pressure plate against the driven plate, thereby adding to the clamping load. While the thrust due to the clamping springs is constant, the movement due to the centrifugal force varies as the square of the speed (Fig. 2.18). The reserve factor for the thrust spring can be reduced to 1.1 compared to 1.4-1.5 for a conventional helical coil spring clutch unit. Conversely, this clutch design may be used for heavy duty applications where greater torque loads are transmitted.

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