JPH10246353A - Solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of parts by magnetizing at least either of a core and a movable member arranged in opposition to the core in such a manner that pulling force is generated between the core and the movable member and providing an electromagnetic coil which generates repulsive force between the core and the movable member. SOLUTION: A plunger 58 generates a permanent magnetic field because a side which opposes to a core 62 is magnetized to N-pole. Accordingly, when an electromagnetic coil 54 does not generate a magnetic field, pulling force due to the permanent magnetic field acts between the core 62 and the plunger 58 to energize a valve body 70 in the direction in which the valve body is closed, and the valve body 70 is seated on a valve seat 68 to close the valve body. On the other hand, when the electromagnetic coil 54 generates a magnetic field, a magnetic field which is repulsive against the permanent magnetic field generated by the plunger 58 is generated on an inner peripheral side of the electromagnetic coil 54. Consequently, an end face which opposes to the plunger 58 of the core 62 is magnetized to N-pole, repulsive force which makes the core 62 and the plunger 58 apart from each other acts between them, and the valve body 70 leaves the valve seat 68 to open the valve body 70.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve, and more particularly, to a solenoid valve suitable for switching a state of a fluid circuit.

[0002]

2. Description of the Related Art Conventionally, Japanese Patent Application Laid-Open No.
An electromagnetic valve is known as disclosed in Japanese Patent No. 22. FIG.
FIG. 1 shows a cross-sectional view illustrating a configuration of a conventional solenoid valve 10. The solenoid valve 10 has a sleeve 12. Sleeve 12
Is made of a non-magnetic material. An electromagnetic coil 14 is provided around the sleeve 12. The electromagnetic coil 14 includes an annular member 16 formed so that its cross section has a C shape. The annular member 16 is made of a magnetic material.

[0003] Inside the sleeve 12, a plunger 18 is provided.
Is inserted. A movable shaft 20 is fixed to the plunger 18. The plunger 18 is made of a magnetic material. On the other hand, the movable shaft 20 is made of a non-magnetic material. A yoke 22 is fixed inside the sleeve 12. A spring 24 for urging the plunger 18 is provided inside the yoke 22.

[0004] At the end of the sleeve 12, a core 26 is press-fitted. The movable shaft 20 is slidably held by the core 26. A sheet member 28 is inserted into the core 26. A through hole 30 and a valve seat 32 are formed in the seat member 28. On the other hand, a valve body 34 is provided at an end of the movable shaft 20 so as to face the valve seat 32.
The through hole 30 is closed when the valve body 34 is seated on the valve seat 32, and is opened when the valve body 34 is separated from the valve seat 32.

When no exciting current flows through the electromagnetic coil 14, the valve body 34 is seated on the valve seat 32 by the urging force of the spring 24. Therefore, according to the solenoid valve 10, the valve closing state can be realized by not supplying the exciting current to the solenoid coil 14. When the exciting current flows through the electromagnetic coil 14, the annular portion 16 of the electromagnetic coil 10, the yoke 2
2, and a magnetic flux circulating through the plunger 18 is generated. As a result, an electromagnetic force is generated between the plunger 18 and the yoke 22 to attract the two. For this reason,
The valve body 34 is separated from the valve seat 32 when the exciting current is flowing through the electromagnetic coil 14. Therefore, according to the electromagnetic valve 10, the valve opening state can be realized by supplying the exciting current to the electromagnetic coil 14.

[0006]

However, the conventional solenoid valve 10 generates a force for urging the plunger 18 in the valve closing direction by using a spring 24. For this reason, in configuring the conventional solenoid valve 10, the spring 24 could not be eliminated. Further, in the above-described conventional solenoid valve 10, in order to realize the valve closing state with excellent responsiveness after stopping the supply of the exciting current to the electromagnetic coil 14, it is necessary to supply the exciting current to the electromagnetic coil 14. In addition, it is necessary to prevent the plunger 18 and the yoke 22 from coming into close contact with each other. Therefore, in configuring the conventional solenoid valve 10, it is necessary to take measures such as disposing a spacer 36 made of a non-magnetic material between the core 22 and the plunger 18. In this regard,
The configuration of the conventional solenoid valve 10 is not always an optimal configuration for reducing the number of parts.

[0007] The present invention has been made in view of the above points, and has as its object to provide an electromagnetic valve which is effective in reducing the number of parts.

[0008]

The above object is achieved by the present invention.
As described in the above, in a solenoid valve comprising a movable member disposed to face the core, and a valve mechanism that functions by moving the movable member relative to the core, wherein the core and the movable member At least one of which is magnetized so as to generate a permanent magnetic field that generates an attractive force between the core and the movable member, and repels the permanent magnetic field between the core and the movable member. This is achieved by an electromagnetic valve including an electromagnetic coil capable of generating a repulsive magnetic field that generates a repulsive force.

In the present invention, the valve mechanism opens and closes when the movable member is displaced relative to the core. In order to relatively displace the movable member, it is necessary to selectively generate a repulsive force for separating the movable member from the core and an attractive force for causing the movable member to approach the core. In the present invention, the movable member and the core are magnetized so that an attractive force is generated between them. Specifically, the movable member and the core are magnetized so that the following conditions are satisfied.

[0010] Only one of the movable member and the core is magnetized. Both the movable member and the core are magnetized so that the magnetizing directions are the same. The electromagnetic coil generates a repulsive magnetic field that repels the permanent magnetic field. In the above case, when a repulsive magnetic field flows through a non-magnetized member (hereinafter, referred to as a non-magnetized member), the member is magnetized (hereinafter, referred to as a magnetized member).
A repulsive force is generated between the magnet and the non-magnetized member. Further, in the above case, when the permanent magnetic field of one magnetized member is canceled and a repulsive magnetic field repelling the permanent magnetic field of the other magnetized member flows, a repulsive force is generated therebetween. As described above, an attractive force and a repulsive force are selectively generated between the movable member and the core according to whether the electromagnetic coil generates a repulsive magnetic field. Therefore, the state of the valve mechanism can be switched by controlling the state of the electromagnetic coil.

Further, the above object is achieved by a movable member disposed opposite to a core and a valve mechanism which functions by displacing the movable member relative to the core. , The core and the movable member are respectively magnetized so as to generate a permanent magnetic field that generates a repulsive force between the core and the movable member, and the core and the movable member are The present invention is also achieved by an electromagnetic valve including an electromagnetic coil capable of canceling one of a permanent magnetic field generated by a member and generating a canceling magnetic field that generates an attractive force between the core and the movable member.

In the present invention, in order to drive the valve mechanism, it is necessary to selectively generate an attractive force and a repulsive force between the movable member and the core. In the present invention, the movable member and the core are magnetized so as to generate a repulsive force therebetween, that is, to generate a permanent magnetic field that repels each other. When the movable member and the core are magnetized in this way, if a canceling magnetic field that cancels out the permanent magnetic field flows through one of the members, the repulsive force between the movable member and the core disappears, and instead, the attractive force Occurs. As described above, an attractive force and a repulsive force are selectively generated between the movable member and the core depending on whether or not the electromagnetic coil generates a canceling magnetic field. Therefore, the state of the valve mechanism can be switched by controlling the state of the electromagnetic coil.

[0013]

FIG. 1 is a sectional view showing the structure of a solenoid valve 50 according to an embodiment of the present invention. Solenoid valve 50
Is provided with a sleeve 52. The sleeve 52 is made of a non-magnetic material. Around the sleeve 52,
An electromagnetic coil 54 is provided. The electromagnetic coil 54 is
An annular member 56 shaped so that its cross section has a C shape.
It has. The annular member 56 is made of a magnetic material. In the present embodiment, the electromagnetic coil 54 is driven such that the rotation direction of the exciting current I coincides with the rotation direction of the right screw traveling from right to left in FIG.

A plunger 58 is provided inside the sleeve 52.
Is inserted. In the present embodiment, the plunger 58
Are magnetized such that the left side in FIG. 1 is an S pole and the right side is an N pole. A movable shaft 60 is fixed to the plunger 58. The movable shaft 60 is made of a non-magnetic material. The plunger 58 and the movable shaft 60 are
Can be displaced integrally in their axial direction.

A core 62 is press-fitted into the sleeve 52 from the opening end side. The core 62 is formed of a magnetic material. The core 62 has a movable shaft 6 penetrating the center thereof.
0 is slidably held. A sheet member 64 is inserted into the core 62. A through hole 66 and a valve seat 68 are formed in the seat member 64. A valve body 70 is provided at an end of the movable shaft 60 so as to face the valve seat 68. The through hole 66 is closed when the valve body 70 is seated on the valve seat 68, and is opened when the valve body 70 separates from the valve seat 68.

FIG. 1 shows a state in which the valve body 70 is seated on the valve seat 68, that is, a valve closed state. When the closed state shown in FIG. 1 is realized, the solenoid valve 50
It is designed such that a predetermined clearance is formed between the core and the core 62. Therefore, according to the solenoid valve 50, it is possible to prevent the two from coming into close contact with each other without disposing a spacer or the like between the plunger 58 and the core 62.

When the closed state shown in FIG. 1 is realized, the solenoid valve 50 is connected between the valve body 70 and the core 62.
It is designed such that a predetermined clearance length L is secured in the axial direction of the movable shaft 60. Accordingly, the movable shaft 60 can move in the direction in which the valve body 70 is separated from the valve seat 68 by a maximum length L without interfering with the core 62, that is, in the valve opening direction.

As described above, the plunger 58 includes the core 62
Is magnetized so that the side opposite to the N pole becomes the N pole. A permanent magnetic field is generated around the plunger 58 due to the fact that the plunger 58 is magnetized as described above. When the exciting current I does not flow through the electromagnetic coil 14, that is, when the electromagnetic coil 14 does not generate a magnetic field,
The permanent magnetic field generated by the plunger 58 returns through the core 62 and the annular member 56 as shown by a dashed line in FIG. In this case, an attractive force due to the permanent magnetic field acts between the core 62 and the plunger 58.

The attractive force acting between the core 62 and the plunger 58 acts as a force for urging the movable shaft 60, that is, the valve body 70 in the valve closing direction. For this reason, according to the electromagnetic valve 50, the valve body 70 is seated on the valve seat 68 by not supplying the exciting current to the electromagnetic coil 54, and the valve closing state can be realized. When the exciting current I is supplied to the electromagnetic coil 54, the exciting current I
A magnetic field having an intensity corresponding to the above is generated. As described above, the rotation direction of the exciting current I coincides with the rotation direction of the right-hand screw traveling from right to left in FIG. In this case, a magnetic field repelling the permanent magnetic field generated by the plunger 58, that is, a repelling magnetic field, is generated on the inner peripheral side of the electromagnetic coil 54.

The repulsive magnetic field generated by the electromagnetic coil 54 flows through the core 62. When the repulsive magnetic field flows through the core 62, the end face of the core 62 facing the plunger 58 is excited to the N pole. When the core 62 is excited as described above, a repulsive force acts to separate the core 62 and the plunger 58 from each other. The repulsive force acting between the core 62 and the plunger 58 acts as a force that biases the valve body 70 in a direction to separate from the valve seat 68. Therefore, the solenoid valve 5
According to 0, by supplying the exciting current I to the electromagnetic coil 54, the valve body 70 can be separated from the valve seat 68, and the valve opening state can be realized.

As described above, the conventional solenoid valve 10 shown in FIG.
Has a spring 24 and a spacer 36 as components. In contrast, the solenoid valve 50 of the present embodiment
Can appropriately realize desired functions without using these as components. Further, the conventional solenoid valve 10
Due to the restriction on the configuration, it is necessary to divide the member housed in the sleeve 12 into the yoke 22, the plunger 18, and the core 26. On the other hand, in the solenoid valve 50 of the present embodiment, the member housed in the sleeve 52 is a plunger 5
8 and the core 62. Therefore, according to the configuration of the present embodiment, it is possible to realize the electromagnetic valve 50 that realizes the closed state in a normal state with a significantly smaller number of components than the conventional electromagnetic valve 10.

By the way, the conventional solenoid valve 10 shown in FIG.
Causes the valve element 34 to be displaced in the valve opening direction by generating an attractive force between the plunger 18 and the yoke 22. Therefore, when the conventional electromagnetic valve 10 is opened, the plunger 18 comes into contact with the yoke 22 (spacer 36), so that a tapping sound is generated. When an exciting current is flowing through the electromagnetic coil 14 of the conventional solenoid valve 10, the plunger 18
The attractive force acting between the and the yoke 22 increases as they approach. For this reason, the plunger 18 and the yoke 2
The striking sound generated when the ball 2 comes into contact with the sound 2 tends to be loud.

The solenoid valve 50 of the present embodiment includes a plunger 58
Is generated, and the repulsive magnetic field generated by the electromagnetic coil 54 repels, thereby displacing the valve body 70 in the valve opening direction. The repulsion generated by the repulsion of the permanent magnetic field and the repulsive magnetic field decreases as the distance between the plunger 58 and the core 62 increases. Then, the displacement of the plunger 58 and the valve element 70 is stopped when the repulsion becomes a sufficiently small value.

At this time, the distance that the valve element 70 moves in the process from the valve closing position to the valve opening position (hereinafter, referred to as moving distance).
Is determined by the magnitude of the exciting current I supplied to the electromagnetic coil 54. In this embodiment, the exciting current I is
The moving distance of the valve 70 is set to be shorter than a predetermined clearance length L secured between the valve 70 and the core 62. For this reason, according to the solenoid valve 50, the valve opening state can be realized without bringing the valve body 70 and the plunger 58 into contact with any members, that is, without generating a loud tapping sound. Therefore, according to the solenoid valve 50, excellent quietness can be obtained as compared with the conventional solenoid valve 10.

The solenoid valve 50 of this embodiment is a solenoid valve that realizes a closed state in a normal state as described above. For example, in a hydraulic circuit or the like constituting a brake device of a vehicle, a solenoid valve that realizes a closed state in a normal state and a solenoid valve that realizes an open state in a normal state may be used in combination. As described above, when two different types of solenoid valves are used in combination, if the components of the two types can be shared, the productivity can be improved and the cost can be reduced. Is extremely effective.

FIG. 2 is a sectional view showing the configuration of a conventional solenoid valve 80 which realizes a valve open state in a normal state. Hereinafter, with reference to FIG. 2, the configuration of the solenoid valve 80 that realizes the valve open state in the normal state will be described. In FIG. 2, the same components as those shown in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted or simplified. The solenoid valve 80 includes a sleeve 52 and an electromagnetic coil 5 similar to the solenoid valve 50 of the present embodiment.
4, a movable shaft 60, a core 62, and a valve body 70 are provided. A plunger 82 is housed inside the sleeve 52. The plunger 82 is the same as the plunger 58 included in the solenoid valve 50 of this embodiment except that it is not magnetized.

The solenoid valve 80 has a seat member 84 inserted into the core 62. The seat member 84 is provided with the electromagnetic valve 8.
In order to realize the function required for the solenoid valve 50, it is formed in a shape different from the seat member 64 included in the solenoid valve 50 of the present embodiment. The solenoid valve 80 includes a spring 86 that is interposed between the seat member 84 and the movable shaft 60 and biases the valve body 70 in the valve opening direction.

When no exciting current is supplied to the electromagnetic coil 54, the valve body 70 is held at the valve-opening position by being urged by the spring 86. Further, when an exciting current is supplied to the electromagnetic coil 54, an electromagnetic force for attracting the plunger 82 to the core 62 is generated.
0 is displaced toward the valve closing position. Therefore, the solenoid valve 80
According to this, the valve-opening state can be realized in a normal state, and the valve-closing normal state can be realized by supplying an exciting current to the electromagnetic coil 54.

As shown in FIGS. 1, 2 and 5, the solenoid valve 50 of the present embodiment has a common component with a solenoid valve 80 which realizes an open state in a normal state as compared with the conventional solenoid valve 10. Has many. Therefore, according to the solenoid valve 50 of the present embodiment, when used in combination with the solenoid valve 80, in order to improve the productivity and to reduce the cost,
Particularly good benefits can be obtained.

By the way, in the above embodiment, the plunger 58 is arranged such that the left side in FIG.
Is magnetized so that the right side becomes the N pole, but the direction of the magnetization is not limited to this, and it may be magnetized in the opposite direction. In the above embodiment, the plunger 58 is magnetized and the core 62 is not magnetized. However, the present invention is not limited to this, and the core 62 may be magnetized instead of the plunger 58. Or both the plunger 58 and the core 62
A configuration in which magnetization is performed so that the magnetization directions are the same may be employed.

In the above embodiment, the plunger 58 corresponds to the "movable member" of the first aspect, and the valve body 70 and the seat member 64 correspond to the "valve mechanism" of the first aspect.
In addition, the electromagnetic coil 54 corresponds to the “electromagnetic coil” according to claim 1. Next, referring to FIG.
A second embodiment of the present invention will be described. FIG. 3 is a sectional view showing a configuration of a solenoid valve 90 corresponding to the second embodiment of the present invention. In FIG. 3, the same components as those shown in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

The solenoid valve 90 of this embodiment has an electromagnetic coil 92 around the sleeve 52. Electromagnetic coil 92
Is designed to extend to the outer peripheral portion of the core 62. The electromagnetic coil 92 includes an annular member 94 formed so that its cross section has a C shape. Annular member 94
Is made of a magnetic material. In the present embodiment, the direction of the exciting current I supplied to the electromagnetic coil 94 is set so as to coincide with the rotation direction of the right-hand screw traveling from right to left in FIG. 1, as in the case of the first embodiment described above. Stipulated. Therefore, when a current is supplied to the electromagnetic coil 92, a repulsive magnetic field that repels the permanent magnetic field generated by the plunger 58 is generated on the inner peripheral side of the electromagnetic coil 92, as in the case of the first embodiment.

When the exciting current I is not supplied to the electromagnetic coil 92, the electromagnetic valve 90 shown in FIG.
As in the case of 0, the valve is kept closed. When the exciting current I is supplied to the electromagnetic coil 92, a repulsive magnetic field is generated by the electromagnetic coil 90. In this embodiment, the repelling magnetic field returns mainly through the core 62 and the annular member 94.
When the repulsive magnetic field circulates as described above, the permanent magnetic field of the plunger 52 is maintained without weakening the plunger 52 of the core 62.
Can be efficiently excited to the N pole. Therefore, according to the solenoid valve 90, a repulsive force for displacing the valve body 70 in the valve opening direction can be efficiently generated between the plunger 52 and the core 62.

In the above embodiment, the plunger 52 is magnetized and the core 62 is not magnetized. However, the present invention is not limited to this. Or a configuration in which both the plunger 58 and the core 62 are magnetized so that the magnetization directions are the same.
In the above embodiment, the electromagnetic coil 92 corresponds to the “electromagnetic coil” of the first aspect.

Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 4 is a sectional view illustrating a configuration of a solenoid valve 100 according to a third embodiment of the present invention. In FIG. 4, the same components as those shown in FIG. 1 or FIG. 3 are denoted by the same reference numerals, and description thereof will be omitted. The solenoid valve 100 according to the present embodiment includes a core 102. The core 102 is magnetized in a direction opposite to the magnetizing direction of the plunger 52, that is, such that the left side in FIG. 4 becomes the N pole and the right side in FIG. 4 becomes the S pole. When the core 102 and the plunger 52 are magnetized in opposite directions, a repulsive force is generated between the two. Therefore, when the exciting current is not supplied to the electromagnetic coil 92, the electromagnetic valve 100 is opened.

In this embodiment, the direction of the exciting current I supplied to the electromagnetic coil 94 is opposite to that in the first and second embodiments described above, that is, from left to right in FIG. The direction is set to match the direction of rotation of the right screw. When the exciting current I having the above-described directivity flows through the electromagnetic coil 92, a magnetic field in a direction to cancel the permanent magnetic field of the core 102 (hereinafter, referred to as a canceling magnetic field) is generated on the inner peripheral side of the electromagnetic coil 92. .

When the permanent magnetic field of the core 102 is canceled by the canceling magnetic field generated by the electromagnetic coil 92, the plunger 58 is disposed between the core 102 and the plunger 58.
Attraction occurs due to the permanent magnetic field generated by the magnetic field. Therefore, when the exciting current I is supplied to the electromagnetic coil 92, the electromagnetic valve 100
Can be brought into the valve closed state. As described above, according to the configuration of the present embodiment, the valve is kept open in the normal state by a simple configuration without using a spring or the like for urging the valve body 70 in one direction. It is possible to realize the electromagnetic valve 100 that is opened when the excitation current I is supplied.

In the above embodiment, the plunger 58 corresponds to the "movable member" according to the second aspect, and the valve body 70 and the seat member 64 correspond to the "valve mechanism" according to the second aspect.
The electromagnetic coil 90 corresponds to the “electromagnetic coil” according to the second aspect.

[0039]

As described above, according to the first and second aspects of the present invention, the attraction and repulsion required to drive the valve mechanism can be generated without using a spring. it can. Therefore, according to the present invention, the number of parts of the solenoid valve can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a configuration of a solenoid valve according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a configuration of a conventional solenoid valve used in combination with the solenoid valve shown in FIG.

FIG. 3 is a cross-sectional view illustrating a configuration of a solenoid valve according to a second embodiment of the present invention.

FIG. 4 is a sectional view illustrating a configuration of a solenoid valve according to a third embodiment of the present invention.

FIG. 5 is a cross-sectional view illustrating a configuration of a conventional solenoid valve.

[Explanation of symbols]

 50; 90; 100 solenoid valve 54; 92 solenoid coil 58 plunger 62; 102 core 64 seat member 70 valve body

Claims (2)

[Claims] A movable member disposed to face the core;
A valve mechanism that functions by relative displacement of the movable member with respect to the core, wherein at least one of the core and the movable member generates an attractive force between the core and the movable member. And an electromagnetic coil capable of generating a repulsive magnetic field that generates a repulsive force between the core and the movable member by repelling the permanent magnetic field while being magnetized to generate a permanent magnetic field. Characteristic solenoid valve. 2. A movable member disposed to face the core,
A valve mechanism that functions by the movable member being relatively displaced with respect to the core, wherein the core and the movable member generate a repulsive force between the core and the movable member, respectively. A canceling magnetic field that is magnetized so as to generate a permanent magnetic field, and that can cancel one of the permanent magnetic fields generated by the core and the movable member to generate an attractive force between the core and the movable member. An electromagnetic valve, comprising: an electromagnetic coil that generates an electromagnetic wave.