What does the valve body in automatic transmission do?

The valve body on the gearbox is used for high and low gears. When the vehicle speed reaches a certain gear, the hydraulic oil pushes the valve body to automatically change the gear to this gear.

Automatic transmission can automatically change the transmission ratio according to the engine load and vehicle speed, so that the car can obtain good power and fuel economy and reduce engine emission pollution. The automatic transmission is easy to operate, and it can greatly improve the safety and reliability of the vehicle when the vehicle is crowded.

Electronically controlled automatic transmission usually consists of five parts: hydraulic torque converter, planetary gear transmission system, shift actuator, hydraulic control system and electronic control system.

Function of transmission oil

For lubrication and cooling, transmission oil should transfer heat to transmission housing and transmission radiator to dissipate heat. Automatic transmission is not allowed to have more or less oil. It cannot be used normally with the transmission. Will bring quality hazards. Leading to premature failure and abnormal control of the transmission.

Moreover, this part of energy loss will be converted into heat in the gearbox, which will make the gearbox temperature rise continuously, and eventually lead to the early wear of bearings and the burning of friction plates in the gearbox, which is not cheap to replace and maintain. In short, the oil can not be added more or less, and the gearbox will be lubricated and heated when it is designed. The amount of gearbox oil added is accurately verified, and there are strict requirements on what type of gearbox oil to add.