Fluid pressure control device

Abstract

A solenoid section of a solenoid three-way valve includes a yoke attached to a valve housing and formed from a bottomed cylindrical main yoke and an auxiliary yoke closing an open end of the main yoke, a coil assembly inside the yoke, a fixed core slidably fitted into a hollow portion of a bobbin and abutted against a ceiling wall of the main yoke, a movable core facing the fixed core and passing through the auxiliary yoke, and a coil spring compressed between the cores. The fixed core is abutted against the wall by a predetermined spring load and by electromagnetic attraction force between the core and wall based on coil energization. A valve rod is slidably supported in a housing hole, having one end separably abutted against an outer end of the movable core and an opposite end abutted against a valve body.

Description

technical field [0001] The present invention relates to the improvement of the hydraulic control device. The hydraulic control device includes: a slide valve, which selectively switches the connection or cut-off of the output port, the input port, and the release port according to the action / release hydraulic pressure on the pilot chamber; and the electromagnetic three-way The valve alternately switches between a state where the hydraulic pressure is applied to the pilot chamber from the input port, and a state where the hydraulic pressure in the pilot chamber is released. Background technique [0002] It is known from the following patent documents that, in the hydraulic control device, the spool valve and the electromagnetic three-way valve are arranged on the valve body so that their axes are parallel, and the direction along the axis of these valves can be adjusted. The miniaturization of the valve body, that is, the hydraulic control device, is achieved, and the slide v...

AI Technical Summary

Problems solved by technology

[0004] However, in the above-mentioned conventional hydraulic control device, since the fixed iron core and the solenoid case (yoke) are integrally formed by forging, etc., there is a disadvantage in that the manufacturing cost increases.

In addition, since a part of the valve part of the electromagnetic three-way valve is combined with a part of the solenoid part to realize integration, therefore, when the structural part of the solenoid part is also used in other solenoid valves with different structures of the valve part (such as Electromagnetic 2-way valve) is an unfavorable structure in terms of cost savings

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