The role of the car transmission
1.Change the transmission ratio, expand the range of torque and speed of the drive wheel to adapt to the constantly changing driving conditions, and at the same time make the engine work under favorable conditions (higher power and lower fuel consumption);
2.The vehicle can be driven backwards without changing the direction of rotation of the engine;
3.Using neutral to interrupt the power transmission, the engine can start, idle, and facilitate transmission shifting or power output.
The transmission consists of a variable speed drive and an operating mechanism, and a power take-off can be added when required. There are two ways to classify: according to the change of the transmission ratio and the difference of the manipulation mode.