A equipment drive drive requires two gears for operation. 
The two gears are spur cut, and the drive gear receives pressure from the energy output. The drive gear then transfers capacity to the driven gear.
Different Drive Systems
All drive systems need a drive gear. The drive gear is the primary transfer from the power source to the driven equipment. A belt from the drive equipment to the driven equipment is a “belt driven” system. Another option is the “chain driven” program. The “chain driven” program uses a chain from the drive equipment to the driven equipment. The “gear drive” program is immediate gear-drive. The drive gear is directly meshed with the powered gear.
Common applications
Gear drives are used in transmissions, back ends and transfer cases; at times the drive gear will be smaller compared to the driven gear. Different gear ratios enable the transmission to shift to lower or higher rpm speeds.
Automotive gear drive
Gear drives are applied to automotive engines. A “gear drive” usually identifies the timing drive; it replaces the common timing-chain with spur-cut gears. A gear drive is well known for the “whining noise” it emits. The teeth of the gears mesh jointly as the gears change with the rotation of the engine. This retains the engine with time.