JP2001343086A - Solenoid valve device - Google Patents

Abstract

(57) [Problem] To provide an electromagnetic valve device capable of securing a magnetic attraction force without increasing the size of the device. SOLUTION: A bobbin 11 around which a coil 12 is wound,
A movable core 13 disposed on the inner periphery of the bobbin;
The fixed core 14 disposed on one end side of the
The solenoid valve device 10 includes a valve body 16 for communicating and blocking a, and a coil spring 15 for urging the movable core 13 away from the fixed core 14. The bobbin 11 has a first cylindrical portion at one end thereof. 11A, and a second end having a smaller inner diameter than the first cylindrical portion 11A on the other end side in order to increase the magnetic attraction between the movable core 13 and the fixed core 14.
The cylindrical portion 11B was formed continuously with the first cylindrical portion 11A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic valve device for connecting and disconnecting a fluid passage in accordance with energization of a coil.

[0002]

2. Description of the Related Art As a conventional electromagnetic valve device, for example, a technology disclosed in Japanese Patent Application Laid-Open No. Hei 8-93947 is known. The electromagnetic valve device disclosed in this publication includes a bobbin around which a coil is wound, a fixed core disposed on the inner periphery of one end of the bobbin, and a yoke disposed on the inner periphery of the other end of the bobbin. And a movable core disposed movably in the axial direction between the fixed core and the yoke.

[0003]

Here, in order to improve the responsiveness and secure the reliability of the solenoid valve device, the magnetic attraction between the movable core and the fixed core is increased to secure the movable core. It is possible to operate. However, in the configuration of the electromagnetic valve device disclosed in the above publication, the inner diameter of the bobbin at the location where the fixed core, the yoke, and the movable core are provided is constant, and the outer diameter of the movable core is equal to the inner diameter of the bobbin. Because the outer diameter of the magnetic attraction surface in the axial direction between the fixed core and the movable core, which is regulated by the inner diameter of the bobbin, is increased in order to increase the magnetic attraction force because the outer diameter is smaller than the inner diameter of the restricted yoke, The outer diameter of the core must be increased, and the inner diameters of the yoke and bobbin also increase, which causes a problem that the outer diameter of the solenoid valve device increases.

Accordingly, it is a technical object of the present invention to provide a solenoid valve device capable of securing a magnetic attraction force without increasing the size of the device in order to solve the above problems.

[0005]

According to a first aspect of the present invention, there is provided a cylindrical bobbin in which a coil is wound on an outer periphery and an inner periphery of the bobbin movably in an axial direction. A movable core, a fixed core disposed on one end side of the bobbin opposite to an end of the movable core, a valve body for communicating and shutting off a fluid passage according to an axial movement of the movable core, An electromagnetic valve device comprising: a movable core and an elastic member disposed between the movable core and the fixed core to bias the core away from the fixed core, wherein the bobbin has a first cylindrical portion at one end thereof. In order to increase the magnetic attraction force acting against the urging force of the elastic member between the movable core and the fixed core, a second cylindrical portion having an inner diameter different from the first cylindrical portion at the other end is formed. It was formed continuously with one cylindrical portion.

According to the first aspect, the first cylindrical portion and the second cylindrical portion having an inner diameter different from the first cylindrical portion are continuously formed on the bobbin, so that the elastic member is provided between the movable core and the fixed core. It is possible to increase the magnetic attraction force acting against the urging force of. That is, since the inner diameter of the first cylindrical portion and the inner diameter of the second cylindrical portion are different, the inner diameter of the portion for securing the magnetic attraction area can be separated from that of the other portion, and the solenoid valve device can be moved without increasing the outer diameter. It becomes possible to increase the magnetic attraction between the core and the fixed core.

More specifically, the inner diameter of the first cylindrical portion of the bobbin is smaller than the inner diameter of the second cylindrical portion.
When the outer diameter of the outer peripheral surface of the movable core is constant and a yoke that is in sliding contact with the outer peripheral surface of the movable core is provided inside the second cylindrical portion, the outer periphery of the movable core is formed by the yoke that is in sliding contact with the movable core. The diameter is set, but since the inner diameter of the second cylindrical portion is larger than the inner diameter of the first cylindrical portion, the outer diameter of the movable core is secured in the second cylindrical portion, and Thus, a space where the coil is wound can be secured. That is, the magnetic attraction between the movable core and the fixed core can be secured without increasing the outer diameter of the solenoid valve device. Furthermore, it is preferable that the outer diameter of the magnetic attraction surface between the fixed core and the movable core be substantially the same as the inner diameter of the first cylindrical portion, since the magnetic attraction area is maximized.

[0008] The configuration different from the second aspect is the fourth aspect.
As shown in the figure, the inner diameter of the first cylindrical portion of the bobbin is larger than the inner diameter of the second cylindrical portion, and the movable core is disposed at a position corresponding to the first cylindrical portion of the bobbin. A first diameter portion having a small diameter and a diameter larger than the inner diameter of the second cylindrical portion and having an axial length shorter than the first cylindrical portion; and an inner diameter of the second cylindrical portion extending from the first diameter portion to the other end of the bobbin. If the outer diameter of the magnetic attraction surface is larger than the inner diameter of the second cylindrical portion in the axial direction between the fixed core and the movable core, the bobbin In the first cylindrical portion, the magnetic attraction surface between the fixed core and the movable core can be made larger than the inner diameter of the second cylindrical portion, and the magnetic attraction force in the axial direction between the fixed core and the movable core is ensured. be able to. Since the inner diameter of the second cylindrical portion is smaller than the inner diameter of the first cylindrical portion, a space where the coil is wound can be secured without increasing the outer diameter of the solenoid valve device. That is, the magnetic attraction force between the movable core and the fixed core can be increased without increasing the outer diameter of the solenoid valve device.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of an electromagnetic valve device 10 according to a first embodiment, which is an embodiment corresponding to claims 1 to 3 of the present invention.

The electromagnetic valve device 10 includes a resin-made bobbin 11 having a coil 12 wound around the outer periphery thereof and having a tubular shape.
A movable core 13 of a magnetic material disposed movably in the axial direction on the inner periphery of the core; a fixed core 14 of a magnetic material disposed on one end of the bobbin 11 so as to face an end of the movable core 13; A spherical valve body 16 for communicating and blocking the fluid passage in accordance with the axial movement of the movable core 13, and a movable core 13 and a fixed core 14 for urging the movable core 13 in a direction to separate the movable core 13 from the fixed core 14.
Coil spring 1 which is an elastic member disposed between
The valve body 16 is a normally closed valve that shuts off the fluid passage 17a when the coil 12 is not energized.

The bobbin 11 has a first cylindrical portion 1 at one end thereof.
1A, and has a second cylindrical portion 11B at the other end, which is formed continuously with the first cylindrical portion 11A and has an inner diameter larger than the first cylindrical portion 11A. 1st cylindrical part 11
A and a coil 12A are wound around the outer periphery of the second cylindrical portion 11B in an aligned winding, and the inner diameter of the coil 12A wound around the first cylindrical portion 11A is a coil wound around the second cylindrical portion 11B. Although the diameter is smaller than the inner diameter of 12B, it is wound so that the outer diameter is the same.

An aluminum base 17 is formed at one end of the bobbin 11. The base 17 communicates with a hydraulic supply source (not shown), and has a supply port 17a as a fluid passage and a hydraulic switching valve. And the like, and a control port 17b communicating with a reservoir (not shown) and a control port 1 according to the position of the valve element 16
A discharge port 17c communicating with the discharge port 7b is formed.
A valve seat 21 on which the valve body 16 is seated, on the inner peripheral side of the supply port 17a and between the control port 17b and the discharge port 17c;
The valve body 16 is seated on one of the valve seats 21 and 22 according to the position of the movable core 13.
The base 17 may be made of iron or resin other than aluminum.

The movable core 13 has a cylindrical shape in which the outer diameter of the outer peripheral surface is constant, and a concave portion 1 for accommodating one end of a coil spring 15 is provided on the inner periphery on the side facing the fixed core 14.
3A is formed. A shaft 13B is fitted on the opposite side of the recess 13A, and when the coil 12 is not energized, the tip of the shaft 13B presses the valve body 16 in the axial direction to shut off the supply port 17a.

A cylindrical magnetic case 18 is provided on the outer periphery of the bobbin 11 and the coil 12, and a cylindrical magnetic yoke 19 is provided on the inner periphery of the second cylindrical portion 11B. Core 14, case 18, yoke 1
9. The movable core 13 forms a magnetic circuit.

Inside the bobbin 11, a movable core 13 is provided on the inner periphery of the bobbin 11 so as to be movable in the axial direction.
A fixed core 14 is fixedly provided on one end side (the right side in FIG. 1) of the bobbin 11 so as to face the left end surface of the movable core 13. Movable core 1 urged by coil spring 15
In No. 3, the distal end of the shaft 13B formed at the left end presses the valve body 16 so that the valve body 16 comes into contact with the valve seat 21 so that further movement to the left is restricted.

Reference numeral 25 denotes a connector. The solenoid valve device 1 is connected via a connector 25 to an external power supply (not shown).
0 is supplied with power. A terminal terminal 26 is provided in the connector 25 by integral molding. The terminal terminal 26 is electrically connected to the coil 12, and supplies a current to the coil 12.

The present solenoid valve device 10 having the above configuration
The operation of is as follows.

In a state where no current is supplied to the coil 12,
As shown in FIG. 1, the movable core 13 is moved leftward by the urging force of the coil spring 15.
Of the shaft 13B presses the valve body 16 against the valve seat 21 to shut off the supply port 17a. At this time,
The valve body 16 is not seated on the valve seat 22 and the control port 1
7b is a passage 22a provided in the valve seat 22 and the shaft 1
It communicates with the discharge port 17c through a gap with 3B. As a result, the supply of the fluid flowing from the supply port 17a to the control port 17b is prohibited, and the hydraulic pressure in the hydraulic switching valve is discharged from the control port 17b through the discharge port 17c, and is returned to the reservoir.

In a state where current is supplied to the coil 12,
The movable core 13 is attracted to the fixed core 14 by the electromagnetic force, and moves rightward against the urging force of the coil spring 15. As a result, the valve element 16 moves to the right by the oil pressure supplied from the oil pressure supply source, the cutoff of the supply port 17a by the valve element 16 is released, and the valve element 16 receives a force to the right by the oil pressure. Passage 22 while sitting on valve seat 22
Cut off a. Thereby, the fluid flowing from the supply port 17a is supplied to the control port 17b without being discharged from the discharge port 17c, and the hydraulic pressure is supplied to the controlled member. Here, the yoke 1 that is in sliding contact with the movable core 13
Since 9 is formed on the inner periphery of the second cylindrical portion 11B having a larger diameter than the first cylindrical portion 11A, the outer diameter of the movable core 13 is ensured, and the coil 12A wound around the first cylindrical portion 11A is provided. Can be secured. That is, the magnetic attraction between the movable core 13 and the fixed core 14 can be secured without increasing the outer diameter of the electromagnetic valve device 10.

The winding of the coil 12 around the bobbin 11 in the first embodiment will be described. FIG. 2 is a perspective view showing the start of winding of the coil 12 of the solenoid valve device 10 according to the first embodiment, and corresponds to claim 5 of the present invention. As shown in FIG. 2, the coil groove 27 for passing the coil 12 is
A terminal terminal 26 is provided in the axial direction of the outer periphery of the cylindrical portion 11B.
Is wound around the end of the coil 12 connected to the end of the first cylindrical portion 11A through the coil groove 27 from the outer peripheral surface of the first cylindrical portion 11A in an aligned winding, and is wound around the entire area of the first cylindrical portion 11A in the axial direction. When the outer peripheral surface of the coil 12A to be formed becomes the same as the outer peripheral surface of the second cylindrical portion 11B, the coil 12 is wound around the second cylindrical portion 11B by aligned winding so that the diameter of the cylindrical portion is different. Even if it does, the outer diameter of the coil 12 can be wound by the aligned winding. Therefore, terminal terminal 26
Can be arbitrarily formed on either the first cylindrical portion 11A side or the second cylindrical portion 11B side, and the degree of freedom in designing the solenoid valve device 10 is improved.

Next, a second embodiment of the present invention will be described. FIG. 3 is a sectional view of an electromagnetic valve device 30 according to a second embodiment, which is an embodiment corresponding to claims 1 and 4 of the present invention. Solenoid valve device 3 according to second embodiment
0 indicates that when the coil 32 is not energized, the valve 36
This is a normally-open valve communicating with the side 7a, and its main configuration is the same as that of the first embodiment, so that the description is omitted.

The bobbin 31 has a first cylindrical portion 3 at one end thereof.
1A and an inner diameter of the first cylindrical portion 31 on the other end side.
A second cylindrical portion 31B having a smaller diameter than A is continuously formed. The movable core 33 is disposed inside the first cylindrical portion 31A of the bobbin 31 and has a first radial portion 33A whose axial length is shorter than the first cylindrical portion 31A, and the other end of the bobbin 31 from the first radial portion 33A. And a second diameter portion 33B extending to the side. The first diameter portion 33A has a diameter slightly smaller than the inner diameter of the first cylindrical portion 31A and larger than the inner diameter of the second cylindrical portion 31B so as to slide in the first cylindrical portion 31A. Further, the second diameter portion 33B is smaller in diameter than the inner diameter of the second cylindrical portion 31B. The outer diameter of the magnetic attraction surface in the axial direction between the fixed core 34 and the movable core 33 is the second cylindrical portion 31B.
Is set to be larger than the inner diameter of.

An aluminum base 37 is formed at one end of the bobbin 33. The base 37 has a supply port 37a communicating with a hydraulic supply source (not shown), and a controlled member such as a hydraulic switching valve. A control port 37b communicating with a valve (not shown) is formed, and a valve seat 41 on which the valve element 36 is seated is press-fitted on the supply port 37a side of the inner periphery of the base 37. The other end of the bobbin 31 is press-fitted with a valve seat 42 forming a discharge port 37c communicating with a reservoir (not shown), and a slit or an axial through-hole radially extending from the axis of the movable core 33. It is possible to communicate with the space inside the base 37 through the like (not shown). The base 37
May be formed from iron or resin other than aluminum.

A cylindrical magnetic case 38 is provided on the outer periphery of the bobbin 31 and the coil 32, a cylindrical magnetic pipe 40 is provided on the inner periphery of the second cylindrical portion 31 B, and the other end of the bobbin 31 is provided. A yoke 39 made of a magnetic material is provided between the pipe 40 and the case 38 on the side, and the fixed core 34, the case 38, the yoke 39, the pipe 40, and the movable core 33 constitute a magnetic circuit.

The operation of the solenoid valve device 30 having the above configuration is as follows.

In the state where no current is supplied to the coil 32,
As shown in FIG. 3, the movable core 33 is moved rightward by the urging force of the coil spring 35, and the valve body 36 is separated from the valve seat 41 and the supply port 37 a and the control port 37.
b, and the valve body 36 is seated on the valve seat 42 to shut off the discharge port 37c. Thereby, the hydraulic pressure is supplied from the supply port 37a to the control port 37b, and the discharge of the fluid communicating with the space inside the base 37 to the discharge port 37c is prohibited.

In a state where current is supplied to the coil 32,
The movable core 33 is attracted to the fixed core 34 by the electromagnetic force, and moves leftward against the urging force of the coil spring 35. As a result, the valve element 36 is seated on the valve seat 41 to shut off the supply port 37a, and the shutoff of the discharge port 37c by the valve element 36 is released, so that the control port 37b and the discharge port 37c communicate with each other and the control port 37b is closed. Is returned from the discharge port 37c to the reservoir. Here, in the first cylindrical portion 31A of the bobbin 31, the surface for transferring the magnetic field between the fixed core 34 and the movable core 33 can be made larger in diameter than the second cylindrical portion 31B. The magnetic attraction force in the axial direction with the shaft 33 can be secured. Also, the inner diameter of the second cylindrical portion 31B is smaller than the inner diameter of the first cylindrical portion 31A.
The required winding space of the coil 32 can be secured without increasing the outer diameter of the coil 32. That is, the magnetic attraction force between the movable core 33 and the fixed core 34 can be increased without increasing the outer diameter of the electromagnetic valve device 30.

The first and second embodiments of the present invention have been described above. However, the present invention is not intended to be limited to the above-described embodiments, and the solenoid valve device according to the gist of the present invention. Any form may be used.

[0029]

According to the first aspect, the first cylindrical portion, the first cylindrical portion,
By continuously forming the cylindrical portion and the second cylindrical portion having different inner diameters on the bobbin, it is possible to increase the magnetic attraction force acting between the movable core and the fixed core against the urging force of the elastic member. Will be possible. That is, since the inner diameter of the first cylindrical portion and the inner diameter of the second cylindrical portion are different, the inner diameter of the portion for securing the magnetic attraction area can be separated from that of the other portion, and the solenoid valve device can be moved without increasing the outer diameter. It becomes possible to increase the magnetic attraction between the core and the fixed core.

According to the second aspect, the outer diameter of the movable core is set by the yoke which is in sliding contact with the movable core, but the inner diameter of the second cylindrical portion is larger than the inner diameter of the first cylindrical portion.
The outer diameter of the movable core can be secured in the second cylindrical portion, and a space for winding the coil can be secured in the first cylindrical portion. That is, the magnetic attraction between the movable core and the fixed core can be secured without increasing the outer diameter of the solenoid valve device.

According to the present invention, in the first cylindrical portion of the bobbin, the magnetic attraction surface is formed between the fixed core and the movable core by the second cylindrical portion.
The diameter can be made larger than the inner diameter of the cylindrical portion, and the magnetic attraction between the fixed core and the movable core in the axial direction can be secured. Since the inner diameter of the second cylindrical portion is smaller than the inner diameter of the first cylindrical portion, a space where the coil is wound can be secured without increasing the outer diameter of the solenoid valve device. That is, the magnetic attraction force between the movable core and the fixed core can be increased without increasing the outer diameter of the solenoid valve device.

[Brief description of the drawings]

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

FIG. 2 is a sectional view of a solenoid valve device according to a second embodiment of the present invention.

FIG. 3 is a perspective view showing windings of the solenoid valve device according to the embodiment.

[Explanation of symbols]

10, 30 ... solenoid valve device 11, 31
... Bobbins 11A, 31A ... 1st cylindrical part 11B, 3
1B: second cylindrical portion 12, 32: coil 13, 33
... Movable cores 14,34 ... Fixed cores 15,35 ... Coil springs (elastic members) 16,36 ... Valves 17,37
... Bases 17a, 37a ... Supply ports (fluid passages) 17b, 37b ... Control ports 17c, 3
7c: discharge port 18, 38: case 19, 39
... Yoke 21, 22, 41, 42 ... Valve seat 40 ...
pipe

Claims (5)

[Claims] A cylindrical bobbin on which a coil is wound around an outer periphery; a movable core disposed so as to be movable in an axial direction on an inner periphery of the bobbin; and a movable core facing an end of the movable core. A stationary core disposed at one end of the bobbin, a valve element for communicating and blocking a fluid passage in accordance with an axial movement of the movable core, and a biasing member for biasing the movable core in a direction to separate the movable core from the stationary core. An electromagnetic valve device comprising: an elastic member disposed between the movable core and the fixed core; wherein the bobbin has a first cylindrical portion formed at one end thereof, In order to increase a magnetic attraction force acting against a biasing force of the elastic member between the first cylindrical portion and a fixed core, a second cylindrical portion having an inner diameter different from the first cylindrical portion is provided on the other end side. An electromagnetic valve device formed continuously. 2. The inner diameter of the first cylindrical portion of the bobbin is smaller than the inner diameter of the second cylindrical portion, the outer diameter of the outer peripheral surface of the movable core is constant, and the inside diameter of the second cylindrical portion is 2. The solenoid valve device according to claim 1, wherein a yoke is provided for sliding contact with an outer peripheral surface of the movable core. 3. The solenoid valve device according to claim 2, wherein an outer diameter of a magnetic attraction surface between the fixed core and the movable core is substantially the same as an inner diameter of the first cylindrical portion. 4. An inner diameter of the first cylindrical portion of the bobbin is larger than an inner diameter of the second cylindrical portion, and the movable core is disposed at a position corresponding to the first cylindrical portion of the bobbin. A first diameter portion having a diameter smaller than the inner diameter of the one cylindrical portion and larger than the inner diameter of the second cylindrical portion and having an axial length shorter than the first cylindrical portion; and the other end side of the bobbin from the first diameter portion And a second diameter portion having a diameter smaller than the inner diameter of the second cylindrical portion, and the outer diameter of the magnetic attraction surface in the axial direction between the fixed core and the movable core is equal to the second diameter. 2. The solenoid valve device according to claim 1, wherein the diameter is larger than the inner diameter of the cylindrical portion. 5. A coil groove for hooking the coil is formed on an outer peripheral surface of a cylindrical portion of the first cylindrical portion or the second cylindrical portion having a larger inner peripheral diameter of a coil to be wound. The electromagnetic valve device according to claim 1, wherein: