Automatic transmission shift solenoid valve

Abstract

A gear shifting electromagnetic valve of an automatic transmission is characterized in that the gear shifting electromagnetic valve comprises a valve sleeve, a valve base, a magnetism isolating pipe, a fixed iron part, a valve deck, a rolling pin pushing rod and the like; the valve sleeve is hollow in the axial direction and is provided with a first oil port located in the front end and formed in the axial direction and a second oil port formed in the middle in the radial direction; the valve base is hollow in the axial direction, and the front end of the valve base is connected with the rear end of the valve sleeve in a sealed manner; a first cavity is formed in the front end of the valve base; a second cavity is formed in the rear end of the valve base; a third oil port formed in the radial direction is formed in the middle of the valve base; the first cavity and the second cavity are separated through the third oil port; and in the manner that the pushing rod can move in the axial direction, the pushing rod is arranged in the fixed iron part and a guiding sleeve in a penetrating manner, and the acting force of a movable iron part can be transmitted to a second steel ball so that the second steel ball can move forwards. Compared with the prior art, the gear shifting electromagnetic valve has the beneficial effects that responses are fast, leakage is avoided, and service life is long.

Description

technical field [0001] The invention relates to an electromagnetic valve, which is mainly used for shifting gears in automatic transmissions of automobiles. Background technique [0002] With the development of modern industry, especially the needs of large-scale engineering vehicles and military equipment, there is an urgent need for a gearbox reversing solenoid valve with large flow, fast response and no leakage. [0003] At present, there are two types of shift solenoid valves on automatic transmissions in the world: the first type is the traditional large-flow spool valve structure, which has the disadvantages of leakage and slow response; the second type is the advanced small-flow cone valve structure without leakage. quick response. [0004] Such as Figure 11 As shown, an ordinary automatic transmission shift solenoid valve currently on the market belongs to a cone valve, and the valve includes a coil 1a, a moving iron 3a, a fixed iron 2a, a connecting sleeve 5a, a v...

AI Technical Summary

Problems solved by technology

[0005] When the coil is not energized, there is no communication between port P and port C, but the excessive pressure fluctuation of port P will cause the steel ball to push the thimble, and finally push the moving iron to compress the return spring, causing overflow from port P to port C when there is no signal from the electromagnet. flow, causing large fluctuations in P port pressure

This is also the core reason why automatic transmissions on the market cannot shift gears or maintain high-speed gears.

And because it is made of plastic, the overall strength is not high and the service life is not long

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