[VIP第8年] 指数:7
通过认证 
1. Change the transmission ratio to expand the range of torque and rotation speed of the driving wheel.
2, in the engine rotation direction is unchanged, so that the car can go backwards.
3, the use of neutral, interrupt power transmission, to the engine can start, speed, and facilitate the transmission shift or power output.
4, transmission is composed of variable speed transmission mechanism and control mechanism, when needed, can also be equipped with power output.
