Proportional pressure solenoid valve

Abstract

The invention discloses a proportional pressure solenoid valve. The proportional pressure solenoid valve comprises an electromagnetic part, a valve element driven to move by the electromagnetic part, a valve body internally provided with a cavity allowing the valve element to move and a balance spring applying force opposite to the force driven by the electromagnetic part to the valve element. The valve body is provided with a pressure fluid input port and a pressure fluid output port. The input port and the output port communicate with each other through displacement of the valve element so as to control the pressure of the output port. The valve element is internally provided with a feedback cylinder communicating with the output port. A feedback rod is arranged in the feedback cavity, closes one end of the feedback cavity and can float in the feedback cavity. The two ends of the feedback rod are provided with moving positions for position limiting. The feedback has the free stroke during the initial working state. The feedback cavity does not have the feedback function and meets the requirement for quick response of the solenoid valve. The feedback rod abuts against an end cap, the feedback cavity starts to generate the feedback effect. Feedback acting force in the feedback cavity changes along with external acting force to achieve a balance, so that output pressure is stable and accurate, and flexible control over pressure is realized.

Description

technical field [0001] The invention relates to a proportional pressure valve which adopts electromagnetic control and is used for adjusting the output pressure of liquid. The valve is used in the hydraulic system of automobile transmission for pressure stability control of hydraulic oil source. Background technique [0002] In the hydraulic system, the load output force is determined by the pressure of the liquid, so proportional solenoid valves with stable and adjustable output oil pressure are widely used. Due to its pressure output characteristics, the proportional decompression solenoid valve can be used for clutch engagement and separation control or system pressure control in automatic transmissions, so it meets the requirements of fast response, large flow, stable output pressure and precise control of its size. In order to meet the requirements of large flow, the traditional solution is to increase the diameter of the spool, and increasing the diameter of the spool...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a new proportional decompression solenoid valve structure that can meet the requirements of large flow rate, fast response and stable pressure control at the same time, aiming at the defects that the precise control of liquid pressure is more difficult and the response is slower in the prior art.

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