Abstract
This chapter focuses on the clutch of motor vehicle. A clutch is a device for connecting or disconnecting two shafts. It can be a dog clutch, where the engagement is positive through projections on one member mating with corresponding indentations on the other, or a friction clutch, where the torque is transmitted through friction surfaces that allow a progressive engagement as they are brought together. A friction clutch is necessary between the engine and gearbox to disengage and permits a smooth and gradual re-engagement of the drive. When engaged, the clutch must transmit the maximum engine torque without slipping, and when disengaged for gear changing, it must not exert a drag on the idle member. The internal combustion engine must revolve at a reasonable speed to develop sufficient torque to move the vehicle from rest and, when starting, this engine torque must be smoothly and gradually conveyed to the gearbox without shock to the transmission.
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