JP2002340219A - Solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the constitution for restraining generation of an abnormal sound from a solenoid valve. SOLUTION: A coil 13 wound on a bobbin 17 is housed in a housing 11. A movable core 14 having a projecting part 15a is arranged in an inner diameter of the bobbin 17 in a state of being movable in the shaft direction of the coil 13. A valve seat 24a abutting to the projecting part 15a of the movable core 14 and a base member 20 having an input port 21 and an output port 22 for flowing fluid are integrally fixed in the housing 11. The movable core 14 is energized in one direction by a spring 16 arranged between a fixed core 12 and the movable core 14, and is energized so as to become a valve closing state when carrying no current to the coil 13. Such constitution is provided with a communicating passage 23 for releasing a part of input port 21 side fluid pressure to the output port 22 side when carrying no current to the coil 13, and restrains a pressure change on the high pressure side to restrain generation of the abnormal sound.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an electromagnetic valve used for hydraulic control or the like, and more particularly, to adjusting a pressure of a first port and a second port from a valve seat of the electromagnetic valve. The present invention relates to a structure of a solenoid valve configured to suppress generation of abnormal noise.

[0002]

2. Description of the Related Art Conventionally, an electromagnetic valve has been used as a means for switching a pressure of a controlled object to a required pressure or adjusting the required pressure to a controlled object in a hydraulic control apparatus. . For example, in the structure of a solenoid valve,
Japanese Patent No. 2849791 is known as shown in FIG. In the solenoid valve disclosed in this publication, a coil 8 wound around a bobbin made of resin is disposed in a main body housing 1 made of a bottomed cylindrical magnetic material. A movable core 5 having a ball-shaped valve portion 6F is provided at the center of the inner diameter of the bobbin, and is provided so as to slide along the axial direction.

On the other hand, in the cylindrical main body housing 1, the opening of the main body housing is closed by the valve body housing 3 in a state where the coil 8 and the movable core 5 are housed inside the main body housing. The end of the main body housing 1 is caulked. Thus, the valve body housing 3 integrated with the main body housing 1 is provided with the valve seat 4B with which the valve portion 6F of the movable core 5 contacts, and the two ports 4C and 4D on which fluid pressure acts.

A retainer 7 is fitted on the movable core 5, and a spring 9 is provided between the inner wall of the main body housing and the axial end of the retainer. Due to the urging force of the spring 9, the movable core 5 abuts on the valve seat 4B which is a seating surface when the coil 8 is not energized. Thus, when the coil 8 is not energized, the communication between the two ports 4C and 4D is cut off.

However, when the coil 8 is energized, a magnetic path is formed between the movable core 5, the retainer 7, and the main body housing 1 around the coil 8, and in the movable core 5, a valve portion 6F is provided with a valve seat. The movable core 5 moves in a direction to open the valve by an electromagnetic force acting in a direction away from 4B. As a result, the two ports 4C and 4D communicate with each other and have the same pressure, so that the pressure can be adjusted between the two ports.

[0006]

In a structure in which the valve portion of the movable core is brought into contact with the valve seat by the urging force of the spring to regulate the pressure of the two ports, for example, when the coil is de-energized, The fluid flow is blocked so that fluid (eg, oil, etc.) from a port (eg, an input port) does not flow to the other port (eg, an output port), and one port is set to a high pressure and the other port is set to a low pressure. be able to. In addition, when the coil is energized, the movable core is moved by the action of the electromagnetic force so that the valve portion is separated from the valve seat, so that the two ports can communicate with each other and the fluid pressure can be equalized.

However, if the fluid pressure applied to the input port becomes stronger than the urging force of the spring due to pressure pulsation or the like in a state where power is not supplied to the coil, vibration occurs due to the fluid pressure at the input port side, and the valve seat is closed. When the valve seat and the valve portion collide many times at the position, there is a concern that abnormal noise may occur in the valve seat.

Therefore, the present invention has been made in view of the above problems, and has as its technical object to suppress the generation of such abnormal noise of the solenoid valve.

[0009]

The technical means taken to solve the above-mentioned problems includes a housing, a supporting portion, a fixed core fixed to the housing, and a bobbin wound around the bobbin. An annular coil supported by a portion, a movable member having a convex portion, and movable in one direction by energizing the coil, a valve seat integrated with the housing, and the valve seat being in contact with the convex portion; A base member having a first port and a second port communicating with a seat, and a base member disposed between the fixed core and the movable member, wherein the projection is seated on the valve seat when the coil is de-energized; The first port and the second port
An urging member that regulates communication with a port, the solenoid valve energizing the coil to operate the movable member, and adjusts a fluid pressure of the first port and the second port. With the part sitting on the valve seat,
A communication passage for releasing a part of the fluid pressure of the high pressure side port of the first port or the second port to the other low pressure side port,
It is provided on the valve seat or the projection.

[0010] According to this, since the valve seat or the convex portion is provided with a communication passage for releasing the fluid pressure of the high pressure side port of the first port or the second port to the low pressure side port when the coil is not energized, Under the state where the valve section is in contact with the valve seat (valve closed state), a part of the fluid pressure of the high pressure side port can be efficiently released to the low pressure side port by the communication path. As a result, the pressure fluctuation at the high pressure side port when the valve is closed becomes smaller than before, and the change becomes gentler.

As described above, by providing a communication passage in the valve seat or the valve body for releasing a part of the fluid pressure in the high pressure side port to the low pressure side port, a part of the fluid pressure can be efficiently removed from the low pressure side port. Even if the pressure is released to the port and a sudden pressure fluctuation occurs at the high pressure side port, the fluctuation of the fluid pressure can be made smaller and gentler than in the prior art, and the generation of abnormal noise can be suppressed.

In this case, if the communication passage is provided in a part of the valve seat or the convex portion, generation of abnormal noise of the solenoid valve can be suppressed by simple processing.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows a solenoid valve 10 according to the first embodiment.
FIG. The solenoid valve 10 has a cylindrical shape that can be externally connected to a connector (not shown). Solenoid valve 10
Is a housing 11, a fixed core 12 for closing the opening of the housing 11, a coil 13 housed in the housing and wound on a bobbin 17, a movable core (movable member) 14 which operates in the axial direction by the inner diameter of the coil 13, and a valve seat. 24a and input port 2
1 and a spring (biasing member) for biasing the movable core 14 toward the valve seat in a direction in which the convex portion 15a of the movable core 14 contacts the valve seat 24a.
16 is provided.

The solenoid valve 10 described below is different from the solenoid valve 10 in that the communication between the input side and the output side is completely shut off when the valve is closed, and the pressure (high pressure side) acting on the input side is changed to the output side. Even if a part leaks to the (low pressure side), it can be applied to products that do not interfere with the product specifications.

The housing 11 has an annular, partially bottomed cylindrical shape, and is made of a magnetic material (eg, iron, SPC material, etc.). The housing 11 is attached to a resin base member 20. The base member 20 is made of a material in which a glass material is mixed with PPS resin, and has a valve seat 24a coaxial with the axis of the housing 11 as shown in FIG. The base member 20 has an input port (high pressure side) 21 penetrating in the axial direction of the valve seat 24a, and an output port (low pressure side) 22 extending vertically from the end on the valve seat 24a side. From input port 21 to output port 2
2 is connected via a valve seat 24a, and a fluid (for example, hydraulic oil) can flow from the input port 21 to the output port 22. In the present embodiment, the input port 21 is set to the pressure supply side and the output port 22 is set to the discharge side. However, it is not limited to this.

An annular groove 20a is formed on the outer periphery of a portion of the base member 20 where the input port 21 is formed. An O-ring 41 for sealing is fitted in the groove 20a so that it can be attached to an external device (not shown). Has become.

A sleeve 11a whose inner peripheral surface serves as a guide surface of the movable core 14 is provided on the inner periphery of the housing 11, and the movable core 14 is disposed so as to slide on the sleeve 11a. The movable core 14 is coaxial with the coil 13. The movable core 14 has a convex (convex) portion 15a at one axial end on the valve seat 24a side.
And the convex part 15a at the tip of the movable core 14 is the valve seat 24a.
(Valve closed state). On the other hand, a space 42 in which the movable core 14 can move while sliding on the sleeve 11a is formed on the inner periphery of the bobbin 17 on the opposite side of the convex portion 15a, and the fixed core 12 is arranged so as to close the space 42 from one side. Has been established.

An elongated hole 14b is formed in the center of the movable core 14 and extends in the axial direction. One end of a spring 16 is locked in the elongated hole 14b. On the other hand, the other end of the spring 16 is locked at an axial end surface of the fixed core 12.
The fixed core 12 for locking the spring 16 is caulked at several places with respect to the housing 11,
1 and is integrally fixed.

The outer peripheral surface of the central convex portion of the fixed core 12 and the outer peripheral surface of the guide surface 11a serve as a support portion 12a for supporting a bobbin 17 on which the coil 13 is wound.
Is sandwiched from both sides by the housing 11 and the flange 12b of the fixed core 12 in the axial direction.
In this case, an annular groove is formed at one end of the bobbin 17 in the axial direction, and a wave washer 26 is provided therein. The wave washer 26 allows the bobbin 17 to be securely fixed to the fixed core 12 in the leftward direction shown in FIG. The bobbin 17 is clamped in a state where the bobbin 17 is pressed and fixed to the housing 11.

The bobbin 17 has an annular shape of a U-shaped cross section made of resin, the coil 13 is wound in the circumferential direction, and the outer periphery in the axial direction is molded by resin molding. The two winding ends of the coil 13 are guided to the left side shown in FIG. 1, are fixed to terminals (not shown), and are electrically connected to terminals of a connector (not shown). The coil 13 can be energized by connecting an external connector (not shown) to the connector section.

When the coil 13 is not energized, the convex portion 15a of the movable core 14 abuts on the valve seat 24a by the urging force of the spring 16, and the fluid pressure in the output port 22 and the space 42 becomes the same. In this configuration, a communication path 23 that guides a part of the fluid pressure from the input port 21 to the output port 22 is provided. The communication passage 23 functions to release the fluid pressure of the input port 21 on the high pressure side to the output port 22 on the low pressure side so as to suppress the pressure fluctuation of the input port 21. The communication passage 23 is provided in a part of the valve seat 24a by a simple machining such as cutting a groove.

Next, in the above-described configuration, the solenoid valve 10
The operation of will be described.

When the solenoid 13 is not energized (non-energized), the movable core 14 is urged leftward as shown in FIG. Are firmly in contact with the valve seat 24a of the base member 20. In this state,
The convex portion 15a comes into contact with the valve seat 24a in a valve-closed state, and the fluid pressure acting on the input port 21 side is higher than the output port 2 pressure.
The pressure becomes higher than the fluid pressure acting on the two sides.

When the coil 13 is energized,
A current flows through the coil 13. When a current flows through the coil 13, a magnetic flux is generated around the coil 13, and the magnetic flux is
1a, movable core 14, outer peripheral surface of housing, fixed core 1
2 form a closed loop. In this case, the movable core 1
4 moves instantaneously while sliding on the sleeve 11a rightward as shown in FIG. 1 by the action of the electromagnetic force, and the projection 15a is separated from the valve seat 24a (valve open state). As a result, the input port 21 and the output port 22 communicate with each other, the pressure acting on both ports can be made equal, and the pressure of a device to be controlled (not shown) connected to the output port can be adjusted. When the energization of the coil 13 is stopped, the movable core 14 is moved along the guide surface 11a by the urging force of the spring 16.
Moving to the left as shown in FIG. 1, the projection 15a comes into contact with the valve seat 24a.

Therefore, the present invention will be described. In the present invention, a communication passage 23 that connects the input port 21 and the output port 22 is formed in the valve seat 24a in a state where the projection 15a contacts the valve seat 24a. This communication path 23 is the input port 2
It functions so that a part of the pressure acting on 1 is released to the output port 22 side.

As described above, since the communication passage 23 is formed, even when the state of the solenoid valve 10 changes from the open state to the closed state, a part of the fluid pressure on the input port side is transferred to the output port side. The movable core 14 can be opened in a state where the coil 13 is not energized because the pressure can be efficiently released and the pressure fluctuation at the high pressure side port can be suppressed as compared with the conventional configuration without the communication passage 23. It becomes difficult. As a result, vibration due to fluid pressure is less likely to occur on the input port 24 side, and generation of abnormal noise due to collision between the projection 15a and the valve seat 24a can be suppressed.

As described above, in the first embodiment shown in FIG. 1, the input port 21 is provided in the valve seat 24a of the base member 20.
Although the communication path 23 for communicating the output port 22 with the communication port 23 is formed, a configuration shown in FIG. 2 can be adopted as the second embodiment. In the second embodiment, the configuration other than the valve section is the same as that of the first embodiment shown in FIG. 1, and the repeated description is omitted here, and only different portions will be described.

That is, in the first embodiment, the communication path 23 is formed in the base member 20 serving as a fixed member, but the input port 21 and the output port 22 are communicated with the movable member side (here, the surface of the convex portion 15a). The communication passage 23a may be formed in a groove shape. That is, the difference between the first embodiment and the second embodiment is that the communication passage 23 is formed in the valve seat 24a (the first embodiment) or the communication passage 23a is formed in the convex portion 15a ( (2nd Embodiment). FIG.
In the configuration shown in (1), one or two triangular grooves or linear grooves may be formed on the surface of the convex portion 15a, and by providing such a groove, the same effect as in the first embodiment can be obtained. It will be.

That is, in the second embodiment, as in the first embodiment, the communication passages 23 and 23a are formed by the valve seat 24.
The generation of abnormal noise can be suppressed by a simple mechanical processing of changing a part of the shape of a, cutting a part of the base member 20, or forming a notch in the convex part 15a. Therefore, in order to suppress the generation of the abnormal noise, it is possible to suppress the generation of the abnormal noise without increasing the cost as compared with the related art.

[0031]

According to the present invention, the valve seat or the projection is provided with a communication passage for releasing the fluid pressure of the high pressure side port of the first port or the second port to the low pressure side port when the coil is not energized. Therefore, under the state where the valve portion is in contact with the valve seat (valve closed state), a part of the fluid pressure of the high pressure side port can be efficiently released to the low pressure side port by the communication path. As a result, the pressure fluctuation at the high pressure side port when the valve is closed becomes smaller than before, and the change can be moderated,
Generation of abnormal noise can be suppressed.

In this case, if the communication passage is provided in a part of the valve seat or the convex portion, the generation of abnormal noise of the solenoid valve can be suppressed by a simple processing.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a structure of a solenoid valve according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating a structure of a solenoid valve according to a second embodiment of the present invention.

FIG. 3 is a cross-sectional view illustrating a configuration of a conventional solenoid valve.

[Explanation of symbols]

 Reference Signs List 10 solenoid valve 11 housing 12 fixed core 12a support 13 coil 14 movable core (movable member) 15a convex portion 16 spring (biasing member) 17 bobbin 20 base member 21 input port (first port) 22 output port (second port) ) 23, 23a Communication passage 24a Valve seat

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H106 DA07 DA13 DA23 DB02 DB12 DB23 DB32 DC02 DC17 DD03 EE20 GB06 GC07 GC29

Claims (2)

[Claims] A coil having a housing, a fixed core fixed to the housing and having a support portion, an annular coil wound on a bobbin and supported by the support portion; A movable member that can be moved in one direction by applying a current to the housing, a base member that is integrated with the housing, has a valve seat with which the projection abuts, and a first port and a second port that communicate with the valve seat; An urging member disposed between a core and the movable member, wherein the projection is seated on the valve seat when the coil is de-energized, and the urging member regulates communication between the first port and the second port. An electromagnetic valve for operating the movable member by energizing the coil to adjust the fluid pressure of the first port and the second port, wherein the convex portion is seated on the valve seat; 1st port or 2nd port An electromagnetic valve, wherein a communication passage for releasing a part of the fluid pressure of the high pressure side port of the port to the other low pressure side port is provided in the valve seat or the convex portion. 2. The solenoid valve according to claim 1, wherein the communication passage is provided in a part of the valve seat or the projection.