Fluid pressure control device

Patent metadata

Field	Value
Publication number	US-9494247-B2
Application number	US-201514712001-A
Country	US
Kind code	B2
Filing date	May 14, 2015
Priority date	May 21, 2014
Publication date	Nov 15, 2016
Grant date	Nov 15, 2016

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.

First claim

What is claimed is:

1. A fluid pressure control device comprising:
a valve housing;
a spool valve; and
a solenoid three-way valve used to switch an operation of the spool valve, the spool valve and the solenoid three-way valve being provided in the valve housing,
in which the spool valve includes a spool, the spool having one end facing a pilot chamber, and the spool is biased by a spring in a direction of decreasing a volume of the pilot chamber,
the spool is slidably fitted in the valve housing so as to be able to alternatively communicate an output port with one of an input port and a release port,
the solenoid three-way valve includes
a valve section having a valve body and a valve chamber, the valve body being operated to alternatively switch between a first operating condition and a second operating condition, wherein in the first operating condition the valve chamber leading to the pilot chamber is communicated with the input port, and in the second operating condition the valve chamber is communicated with the release port, and
a solenoid section which exerts electromagnetic force for switching operation of the valve body,

the valve housing includes
a bottomed slide hole in which the spool is slidably fitted,
a bottomed housing hole housing the valve section, and extending in parallel with an axis of the slide hole, and
a fluid pressure release passage for guiding fluid pressure to a side of the release port, the fluid pressure being released from the valve chamber when the valve section is in the second operating condition,

wherein the solenoid section includes
a yoke attached to the valve housing and formed from a bottomed cylindrical main yoke and an auxiliary yoke, the main yoke having one end integrated with a ceiling wall and an opposite open end, and the auxiliary yoke closing the open end of the main yoke,
a coil assembly formed by winding a coil around a bobbin, and housed in the yoke,
a fixed core slidably fitted into a hollow portion of the bobbin, and abutted against the ceiling wall,
a movable core disposed in the hollow portion of the bobbin so as to face the fixed core, and passing through the auxiliary yoke, and
a coil spring compressedly provided between the fixed core and the movable core, and acting on the cores to be urged away from each other,

the fixed core is abutted against the ceiling wall by a predetermined load which the coil spring applies to the fixed core, and by electromagnetic attraction force between the fixed core and the ceiling wall based on energization of the coil, and
a valve rod is slidably supported in the housing hole, the valve rod having one end separably abutted against an outer end of the movable core, and an opposite end abutted against the valve body, thereby to operatively connect the valve body with the movable core.

2. The fluid pressure control device according to claim 1 , wherein
the housing hole is formed as a stepped hole including
a large-diameter hole portion formed on the solenoid section side, and
a small-diameter hole portion continuously formed to one end of the large-diameter hole portion via a step portion,

first and second valve seat members include first and second valve seats on which the valve body is seated in the first and second operating conditions, respectively,
the first and second valve seat members are formed such that one valve seat member is fitted in the small-diameter hole portion while the other valve seat member is press-fitted in the small-diameter hole portion, and the one valve seat member is locked to the small-diameter hole portion by the other valve seat member, and
a bearing member is press-fitted into an inner peripheral surface of the large-diameter hole portion, the valve rod slidably passing through and being supported by the bearing member.

3. The fluid pressure control device according to claim 2 , wherein an end surface of the valve rod, which faces the movable core, is formed in a spherical surface shape such that at least a central portion of the end surface bulges out toward the movable core.

4. The fluid pressure control device according to claim 1 , wherein an end surface of the valve rod, which faces the movable core, is formed in a spherical surface shape such that at least a central portion of the end surface bulges out toward the movable core.

Assignees

• Keihin Corp

Inventors

• Oikawa Naoki
• Yamanaka Kentarou

Classifications

• F16K31/426 Primary

  the actuated valves being cylindrical sliding valves · CPC title

• Y10T137/86614

  Electric · CPC title

• F15B13/043

  with electrically-controlled pilot valves · CPC title

• F16K11/07

  with cylindrical slides · CPC title

• F16K31/061 Primary

  Sliding valves · CPC title