The components concerned with the transmission of engine power to the road wheels of a motor vehicle are the clutch, a gear box or automatic transmission, universal joint, propeller shaft, differential and the axles as well as bearings for the driving wheels. Since it is not possible to permit direct drive of the vehicle under all conditions of speed, it is essential to have some device which can help in changing gears in order to obtain different vehicle speeds. To avoid damage to the transmission and jolting of the vehicle, the rotating engine is not connected directly to a stationary transmission shaft. A device known as clutch is used to disengage the load gradually and smoothly. This is possible only if the clutch slips, i.e. it rotates and slides on the shaft of the gear box instead of making a firm connection between the engine and the gear box.
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