Introduction
Where power has to be transmitted between two shafts which are a distance apart, a belt or rope drive is frequently used. In most cases the power transmitted relies upon the friction between the rope or belt and the rim of the pulley.
However, in the case of toothed belts and chains, friction does not play a beneficial part, no slip is allowable, and a precise relationship between the movement of the pulleys is obtained. Examples of this type of drive are the cam belt used on many modern engines and the simple bicycle chain.
Rope drives, as such, are not much in use now. But, the principle is alive and well in shipping, where capstans and windlasses are used to tighten ropes and chains.
Power is the rate at which work is done or energy is transferred in relation to time. In calculus terms, power is the derivative of work with respect to time.
An engine or motor is a machine designed to convert energy into useful mechanical motion.
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