Solenoid valve for automatic transmission

Abstract

The invention discloses an electromagnetic valve of an automatic gearbox. The electromagnetic valve comprises a valve body with a valve cavity and an electromagnetic coil assembly. A hydraulic oil opening P and a hydraulic oil opening A are machined in the valve body. A valve element assembly is installed in the valve cavity of the valve body. The valve body is a plastic valve body formed by processing plastic. The valve element assembly is composed of a steel ball, a plastic valve stopper and an ejector rod, wherein the steel ball and a one-way oil opening in the valve cavity can form steel-plastic type soft sealing cooperation, and the ejector rod is used for axially pushing the steel ball to open the one-way oil opening so that an oil path between the opening P and the opening A can be through. An oil hole is formed in the plastic valve stopper, the electromagnetic coil assembly and the valve body are connected into a whole through a plastic sealing body, the tail end of the ejector rod extends into the electromagnetic coil assembly, and the electromagnetic coil assembly controls the ejector rod to push the steel ball through combination of electromagnetic force and spring force. The valve body is fixedly provided with a filter net connector which can enable the electromagnetic valve of the automatic gearbox and a speed changer valve plate to achieve quick insertion type installation. The filter net connector is provided with a filter net for filtering hydraulic oil flowing through the opening A and the opening P.

Description

technical field [0001] The invention relates to a component of an automatic transmission, in particular to a solenoid valve of an automatic transmission. Background technique [0002] The gearboxes used in automobiles are gradually replaced by automatic gearboxes, especially in mid-to-high-end cars, almost all automatic gearboxes are used. Modern vehicle engine electronic control systems are more and more inclined to choose solenoid valves as actuators, because solenoid valves can directly control fuel injection volume and fuel injection timing, and part of the fuel injection rate can also be realized by solenoid valves. In this way, the three control items can be completed with only one actuator, which greatly simplifies the hardware of the entire electronic and electronic system. Therefore, the solenoid valve is one of the most important components in the current automatic transmission. On the other hand, the on-off solenoid valve is relatively simple, and the drive contr...

AI Technical Summary

Problems solved by technology

[0003] The solenoid valve is used as the actuator of the electronic control system of the engine. Its main function is to control the on-off of the oil circuit. The solenoid valve opens and closes frequently during use, which requires good coaxiality between the moving parts. The more moving parts, the more difficult it is to maintain their coaxiality, the more difficult it is to process and assemble, and the higher the production cost of the product

Once the good coaxiality between the moving parts cannot be maintained, it will affect the performance and service life of the solenoid valve, and then affect the performance of the entire engine

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