JPH07151260A - Solenoid valve for controlling fluid pressure - Google Patents

Abstract

PURPOSE:To easily adjust the pressure adjustment characteristic in the manufacture of a solenoid valve. CONSTITUTION:A sleeve 6 equipped with an input side high pressure port 1, output side high pressure port 2, low pressure port 3, communication passage 4, and a needle valve 5 is incorporated with a housing 12 so as to be displaceable in the axial direction for the housing 12 and not to revolve, and screwed 17 with a fixed core 7. The fixed core 7, electric coil 10, and a yoke 11 are tightening-fixed on the housing 12 by a bolt 13 and a fixing member 16, and then the bolt 13 is tightened, and the yoke 11, etc., are turned, and the screwed state between the sleeve 6 and the fixed core 7 is changed, and the air gap G between the fixed core 7 and the movable core 9 is varied.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid pressure control solenoid valve, and more particularly to a fluid pressure control solenoid valve in which an air gap amount between a fixed core and a movable core can be easily adjusted.

[0002]

2. Description of the Related Art In this type of solenoid valve,
It is known that the amount of air gap between the fixed core and the movable core greatly affects the relationship between the input to the electric coil and the adjusted fluid pressure, that is, the pressure regulation characteristic.

In the mass production method, it is inevitable that the dimensions of the components of the solenoid valve vary, which causes variations in the air gap amount in the assembled solenoid valve. There is a device described in Japanese Patent Laid-Open No. 212209/1990 as a device that can be adjusted after the air gap amount is assembled. This is, as shown in FIG. 3, a high pressure port, a low pressure port, and an axial communication hole that connects these ports,
One end of the sleeve 6A having a valve capable of closing this communication hole against the pressure of the high pressure port is screwed into the inner hole of the fixed core 7A, and one end of the sleeve 6A and the inner hole of the fixed core 7A are screwed together. Shim SH is interposed between the step and
By selecting the number and thickness of the shims SH, the air gap amount between the fixed core 7A and the movable core 9A can be obtained with a desired pressure adjusting characteristic.

[0004]

However, in the one disclosed in the above-mentioned publication, when the assembled solenoid valve does not exhibit the desired pressure regulating characteristics, the sleeve 6A and the fixed core 7A are replaced for replacement of the shim SH. Had to be disassembled, and there was a problem that production efficiency was poor.

An object of the invention of this application is to provide a solenoid valve which, once assembled, can adjust the amount of air gap without disassembling it, and therefore has high productivity.

[0006]

In order to achieve the above object, according to the invention of claim 1, a housing having a cylinder bore, and a housing that is displaceable in the axial direction but cannot rotate in the cylinder bore are installed. And a sleeve having a high pressure port, a low pressure port, a communication hole in the axial direction connecting these two ports, and a valve capable of closing the communication hole against the pressure of the high pressure port, and one end A fixed core screwed with the sleeve; a movable core disposed adjacent to the other end of the fixed core; a fixed core arranged around the fixed core and the outer periphery of the movable core; A coupled electric coil, a non-magnetic force transmission rod penetrating the fixed core so as to be slidable in the axial direction and coupled to the movable core, the fixed core and the electric coil. It said housing to tighten can be fixed, and, in a relaxed state has been assumed that a fixture to permit rotation of said fixed core and said electrical coil.

Further, in the invention of claim 2, in addition to the structure of the invention of claim 1, the sleeve has a flange on the outer periphery, and the sleeve is axially engaged with a notch formed in an outer peripheral portion of the flange. The pins are fixed to the housing.

[0008]

According to the first aspect of the present invention, the pressure of the high pressure port is measured while supplying a predetermined electric power to the electric coil with the solenoid valve mounted on the assembled housing.
If the desired pressure regulation characteristics are not obtained and the air gap needs to be increased or decreased, the sleeve cannot be rotated by loosening the fixture and then rotating the fixed core and electric coil in one direction or the other. Therefore, the threaded state of the sleeve and the fixed core changes, the axial position of the sleeve with respect to the fixed core changes, and the air gap increases or decreases.

According to the invention of claim 2, claim 1
In addition to the action of, the rotation of the sleeve is stopped by the engagement of the pin and the notch of the flange, so the configuration is simple,
Moreover, the workability of inserting the sleeve into the cylinder bore is good.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the invention of this application will be described below with reference to the drawings.

As shown in FIG. 1, the solenoid valve 1
4 has a sleeve 6 which is arranged in the cylinder bore of the housing 12 and which comprises a portion 6b
They are connected to each other by being pressed into the inner holes of b and 6c. The sleeve 6 includes an input side high pressure port 1, an output side high pressure port 2, a low pressure port 3, a communication hole 4 and the communication hole 4
And a slidable needle valve 5 for closing the output side high pressure port 2 against the pressure. 4a is port 1,
It is a passage between a few.

The right end of the sleeve 6 is screwed 17 to the inner circumference of the left end of the fixed core 7 on the outer circumference thereof. The force transmission rod 8 that slidably penetrates the axis of the fixed core 7 is
It contacts the needle valve 5 at its left end, and is connected to the movable core 9 at its right end.

An electric coil 10 surrounds the fixed core 7 and the movable core 9, and a yoke 11 is provided on the outer peripheral portion and the axial end surface of the electric coil 10. FIG. 2 shows a sectional view taken along line XX of FIG. As shown in FIGS. 1 and 2, the sleeve 6 has a flange on the outer periphery,
An axial pin 15 that engages with a notch formed in the outer peripheral portion of the flange is fixed to the houn jig 12. The engagement between the pin 15 and the notch allows the sleeve 6 to move axially but not rotate with respect to the housing 12. The fixed core 7, the electric coil 10, and the yoke 11 are integrated, and the fixed member 16 that engages with the outer peripheral step of the yoke 11 and the housing 1 that penetrates through the fixed member 16.
It is fixed to the housing 12 by means of a bolt 13 that is tightened to 2. When the bolt 13 is loosened, the fixed core, the electric coil 10 and the yoke 11 can rotate.

Incidentally, the fixed core 7, the movable core 9, and the yoke 11
Is made of a magnetic material, and the sleeve 6, the needle valve 5, the force transmission rod 8, and the housing 12 are made of a non-magnetic material.

In the manufacturing process of the solenoid valve 14 of the present embodiment, after the solenoid valve 14 is assembled, the pressure regulating characteristic which is the relationship between the electric power supplied to the electric coil 10 and the fluid pressure of the output side high pressure port 2 is measured (electricity Coil 1
The power supply to 0 may be linear adjustment of the current value or duty control of a predetermined current value). At this time, if the desired pressure regulation characteristic is not obtained and the air gap G needs to be increased or decreased, the bolt 13 is loosened and the yoke 1
1. The air gap is changed by rotating the fixed core 7 or the like in one direction or the other direction and sliding the sleeve 6 in the axial direction through the screwing 17. When the desired pressure adjusting characteristic is obtained, the bolt 13 is tightened to fix the yoke 11 and the like to the housing 12.

The operation of the solenoid valve 14 will be described. In the solenoid valve 14 of FIG. 1, when the electric coil 10 is not supplied with electric power, the needle valve 5 is not biased to close the communication hole 4, so that the fluid pressure in the output side high pressure port 2 becomes the minimum pressure. . When electric power is supplied to the electric coil 10, an electromagnetic attraction force is exerted between the fixed core 7 and the movable core 9, and the needle valve 5 is urged in the direction of closing the communication hole 4, and the output side high pressure port 2 Is controlled in proportion to the urging force applied to the needle valve 5, that is, the electric power supplied to the electric coil 10.

[0017]

As described above, according to the invention of this application, once the solenoid valve is assembled,
Since the air gap amount can be adjusted without disassembling, productivity is improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of the invention of this application.

FIG. 2 is a sectional view taken along line XX in FIG.

FIG. 3 is a vertical sectional view of a conventional solenoid valve.

[Explanation of symbols]

1 High Pressure Port on Input Side 2 High Pressure Port on Output Side 3 Low Pressure Port 4 Communication Hole 5 Needle Valve 6 Sleeve 7 Fixed Core 8 Force Transmission Rod 9 Moving Core 10 Electric Coil 11 Yoke 12 Housing 13 Bolt 14 Solenoid Valve 15 Pin 16 Fixing Member 17 Screw Combined G air gap

Claims (2)

[Claims] 1. A housing having a cylinder bore, a high pressure port, a low pressure port, and a shaft communicating between these ports, the shaft being displaceable in the cylinder bore but not rotatable. Direction communication hole, a sleeve having a valve capable of closing the communication hole against the pressure of the high pressure port, a fixed core having one end screwed to the sleeve, and the other end of the fixed core. A movable core disposed adjacent to the fixed core, an electric coil arranged so as to surround the fixed core and the outer periphery of the movable core, and coupled to the fixed core, and slidable in the fixed core in the axial direction. A force transmission rod made of a non-magnetic material that penetrates through and is coupled to the movable core, and the fixed core and the electric coil can be tightened and fixed to the housing, and in a loosened state. A solenoid valve for fluid pressure control, comprising: the fixed core and a fixture that allows rotation of the electric coil. 2. The fluid pressure control solenoid valve according to claim 1, wherein the sleeve has a flange on an outer circumference, and an axial pin engaging with a notch formed at an outer peripheral portion of the flange has the housing. Solenoid valve for fluid pressure control characterized by being fixed to.