A timing belt is a type of cogged belt, usually made of reinforced rubber, which is used to drive the camshaft in an internal-combustion engine. Also known as timing chain or cam belt, a rubber timing belt is an integral part of an internal combustion engine which controls the timing of the engine’s valves. Instead of timing belts, some engines use timing gears. The term “timing belt” is also used to refer any flat belt with integral teeth. Timing belts are used for power transmission or to interchange rotary motion and linear motion. In such cases, either high loads or maintaining a specific drive ratio are very important. A common non-automotive application of rubber timing belt is in linear positioning systems. Thus, the basic purpose of timing belt is to transfer driving force by connecting wheel transmission, chain transmission and belt transmission. Rubber belts are quieter in their operation, are less expensive and are mechanically more efficient.