211Driven plate inertia

To enable the clutch to be operated effectively, the driven plate must be as light as possible so that when the clutch is disengaged, it will have the minimum of spin, i.e. very little flywheel effect. Spin prevention is of the utmost importance if the various pairs of dog teeth of the gearbox gears, be they constant mesh or synchromesh, are to align in the shortest time without causing excessive pressure, wear and noise between the initial chamfer of the dog teeth during the engagement phase.

Smoothness of clutch engagement may be achieved by building into the driven plate some sort of cushioning device, which will be discussed later in the chapter, whilst rapid slowing down of the driven plate is obtained by keeping the diameter, centre of gravity and weight of the driven plate to the minimum for a given torque carrying capacity.

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