CAM CHAIN: 
Describes the timing chain which controls the overhead camshaft.
CHAIN DRIVE: Describes a system of transferring power from one shaft to another using sprockets and an endless chain, used on a car engine to control the timing of valve opening ( also known as a "timing chain" ).
DRIVE CHAIN: Describes a continuous chain encircling two or more sprockets to transmit motion from one sprocket to the other.
IDLER PULLEY: Describes the spring-loaded pulley designed to maintain the tension of the timing belt.
PULLEY: Describes the grooved wheel carrying either a string, rope, chain, or belt that, when rotated, turns a wheel.
ROLLER CHAIN: Describes a chain that transmits power with which each link consisting of two free-moving rollers located by pins connected to side plates.
SLACK: Describes the levels of free play in a chain or belt where excessive slack is liable to cause the chain/belt to slip from the sprockets; On the other hand, too, little play is liable to cause excessive wear on the final drive system.
SPROCKET: Describes a disc with teeth used to drive a chain.
TIMING BELT PULLEY: Describes the spring-loaded jockey pulley whose role is to take up the slack in the timing belt.
TRIPLEX CHAIN:
Describes a type of chain with three rows of rollers.
V-PULLEY: Describes a type of pulley fitted with a pair of adjustable cup-shaped discs used on belt transmissions to permit adjustment of the effective pulley diameter and transmission ratio.
PAR5