A device for transmitting a role for the load conditions required of the power generated by the engine to the wheels. A device for transmitting a role for the load conditions required of the power generated by the engine to the wheels. Car high-speed rotation of the engine running is an easy mechanism for converting rotary waterways. The decision to ride the accelerated performance and fuel efficiency of automobiles by the difference ratio. With the drive function as components of the car and Inner Shaft Rod Shaft, Contol Rod, it produces various Shaft.