What is the function of the valve body inside the automatic transmission of a car?

Hydraulic control unit inside the box. Using electronic control, it is converted to hydraulic, and finally the actuator is changed, the planetary gear elements are bound, and the transmission ratio is changed.

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

The 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, which can greatly improve the safety and reliability of vehicle driving when the vehicle is congested.

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

The role of transmission oil.

Lubrication and cooling, the transmission oil should dissipate heat from the gearbox housing and the transmission radiator. It is not permissible to have more or less fluid in the automatic transmission. That should not be used with the normal use of the transmission.

It will bring quality hazards. This leads to premature transmission failure and abnormal handling problems.

Moreover, this part of the energy loss will be converted into the heat inside the gearbox, so that the temperature of the gearbox continues to rise, which eventually leads to the early wear of the bearings in the gearbox and the burning of the friction plates, and the replacement and maintenance are not cheap. In short, the oil can neither be added more or less, the gearbox will be designed to do lubrication and heating experiments, the amount of gearbox oil is accurately verified, and there are strict requirements for what type of gearbox oil to add.

Supply oil to each gear of the car, and the solenoid valve controls the oil circuit oil to achieve shift and upshift through the flow of the car [If the car has a problem, ask the car master. 4S shop professional technician, 10 minutes to solve. 】

In the hydraulic control hydraulic automatic transmission, the parameter adjustment part mainly includes the throttle pressure regulating valve (referred to as the throttle valve) and the quick-control pressure regulating valve (also known as the governor). The throttle pressure regulating valve enables the size of the output hydraulic pressure to reflect the throttle opening; The quick-control regulator allows the output hydraulic pressure to reflect the speed of the vehicle.

The control part of the automatic transmission valve body is used to change the oil circuit to the shift actuator (clutch and brake) when shifting, so as to achieve shift control. The lock-up signal valve is controlled by a solenoid valve, which enables the lock-up clutch in the torque converter to engage and disengage in time. The role of the shift quality control part is to make the shift process smoother and softer.

As an important part of the transmission when changing gears, the valve body on a normal transmission is used to shift between high and low gears. When the speed of the vehicle reaches a certain gear, the hydraulic oil pushes the valve body to automatically shift to this gear. The automatic transmission can automatically change the transmission ratio according to the engine load and vehicle speed, so that the car can obtain good power performance and fuel economy, and reduce engine emission pollution.

Automatic transmissions are simple to operate and can greatly improve the safety and reliability of vehicles when they are congested. An electronic automatic transmission usually consists of a torque converter, a planetary gear transmission system, a shift actuator, a hydraulic control system, and an electronic control system.

At present, the single-stage dual-phase three-element lock-up integrated torque converter composed of pump wheel, turbine and guide wheel is widely used in automobiles. The pump wheel and turbine are basin-shaped. The pump wheel is connected with the torque converter housing and is an active component; The turbine suspension in the torque converter, connected to the output shaft by a spline, is a driven element.

The guide wheels are suspended between the pump wheels and the turbine wheels and are fixed to the gearbox housing by means of a one-way clutch and a bushing of the guide wheels. After the engine starts, the crankshaft drives the pump wheel to rotate, and the centrifugal force generated by the rotation causes the working fluid between the pump wheel blades to be thrown out along the blades from the inner edge to the outer edge; This part of the working fluid not only has a circumferential partial velocity that rotates with the pump wheel, but also an axial partial velocity that rushes to the turbine. These working fluids impinge on the turbine blades, pushing the turbine to rotate in the same direction as the pump impeller.