JP2003207067A - Solenoid valve device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small-size solenoid valve device. <P>SOLUTION: A yoke 12, a storage member 14, a suction portion 22 and a movable core 30 are formed of magnetic materials to form a magnetic circuit. A cylindrical opposite recessed portion 24 is formed in the suction portion 22 at the side end of the movable core 30. The movable core 30 is reciprocatingly supported on the inner periphery side face of the storage member 14. A side gap formed by the inner periphery side face of the storage member and the outer periphery side face of the movable core 30 is set large enough to allow the movable core 30 to be inclined to an axis 90 extending along the reciprocating direction of the movable core 30 by an axial shift between the storage member 14 and the suction portion 22. When the axial shift occurs between the storage member 14 and the suction portion 22, the movable core 30 is inclined to the axis 90 with an abutment position between a conical recessed face 32 and a spherical face 42 as a supporting position. A gap between the inner periphery side face 26 of the opposite recessed portion 24 and the movable core 30 has almost no change all over the periphery. <P>COPYRIGHT: (C)2003,JPO

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 in which an accommodating member that supports a movable core so as to be reciprocally movable and an attracting member that exerts a magnetic attractive force between the movable core are separate bodies.

[0002]

2. Description of the Related Art As a conventional solenoid valve device, a solenoid valve device in which a housing member for housing a movable core in a reciprocating manner and a suction member for exerting a magnetic suction force between the movable core are separate bodies are provided. JP-A-2000-230660 and JP-A-1
The thing disclosed by the 0-122412 gazette and the patent 2834552 gazette is known.

In the solenoid valve device disclosed in Japanese Unexamined Patent Publication No. 2000-230660, as shown in FIG. 3, the movable core 200 and the shaft 202 are in flat contact with each other. Housing member 20
4 and the suction member 206 are misaligned with each other, the suction member 2
The movable core 20 in accordance with the axial deviation between 06 and the housing member 204.
The axis 0 can be displaced from the shaft 202. The movable member 200 is attached to the suction member 206 by minimizing the gap formed between the accommodation member 204 and the movable core 200 in the direction orthogonal to the axis along the reciprocating direction of the movable core 200, that is, the so-called side gap. The magnetic attraction force for attraction increases.

However, since the surfaces of the movable core 200 and the suction member 206 facing each other are flat, the gap between the movable core 200 and the suction member 206 in the reciprocating direction of the movable core 200, that is, the larger the main gap, is. , The magnetic attraction force becomes smaller as shown by the curve 100 in FIG. Since the movable core 200 is attracted to the attraction member 206 when the main gap between the movable core 200 and the attraction member 206 is the largest, it is necessary to increase the number of turns of the coil that is the electromagnetic drive unit and generate a large magnetic attraction force. In particular, when the fluid flow rate determined by the maximum value of the main gap is increased, or when the movable core receives a large fluid pressure in the direction away from the attraction member, the magnetic attraction force increases and the electromagnetic drive unit becomes large. There is.

In the solenoid valve device disclosed in Japanese Unexamined Patent Publication No. 10-122412, as shown in FIG.
A recess 218 is formed in the groove 6. When the main gap is large, the shortest distance between the inner peripheral side surface of the recess 218 and the movable core 210 is smaller than that in the configuration where the flat surfaces face each other. Therefore, as shown by a curve 110 in FIG. 2, when the main gap is large, the movable core 210 is attached to the suction member 216.
The magnetic attraction force for attracting is larger than that of the curve 100.

In the solenoid valve device disclosed in Japanese Patent No. 2834552, as shown in FIG. 5, the movable core 220 and the suction member 226 face each other with their tapered surfaces facing each other. Even if the main gap is large, the vertical distance between the tapered surfaces, that is, the shortest distance is short. Therefore, similar to the curve 110 of FIG. 2, when the main gap is large, the magnetic attraction force for attracting the movable core 220 to the attraction member 226 is greater than that of the curve 100.

[0007]

However, JP-A-10-
In the solenoid valve device disclosed in Japanese Patent No. 122412 and Japanese Patent No. 2834552, the movable cores 210, 220
Since the shafts 212 and 222 are press-fitted to the movable cores 210 and 220, the movable cores 210 and 220 are fitted to the shafts 212 and 220 according to the axial deviation between the housing members 214 and 224 and the suction members 216 and 226.
The axis cannot be offset with respect to 222. Housing member 21
4 and 224 and the suction members 216 and 226 are misaligned, the movable cores 210 and 220 and the housing members 214 and 224 are displaced.
In order to prevent an increase in the sliding resistance between the movable cores 210 and 220 and the housing members 214 and 224, it is necessary to increase the side gap in advance. Then, as indicated by the curve 110 in FIG. 2, the suction member 216 and the movable core 21 are
The magnetic attraction force that acts between 0 and 0 decreases overall.

An object of the present invention is to provide a small solenoid valve device. Another object of the present invention is to provide an electromagnetic valve device that maintains a contact state between a movable core and a movable member.

[0009]

According to the electromagnetic valve device of the first or second aspect of the present invention, one of the movable core and the suction member has an opposed recess at the end facing the other, and the movable core is When approaching the suction member, the other of the movable core and the suction member enters the facing recess. Even when the main gap formed between the movable core and the suction member in the reciprocating direction of the movable core is large, the shortest distance between the opposing concave portion and the other of the movable core or the suction member is smaller than the main gap. Here, the main gap is a gap formed in the reciprocating direction of the movable core between the other of the movable core or the suction member and the bottom surface of the facing recess. Therefore, even if the main gap is large, the movable core can be attracted to the attraction member side with a desired magnetic attraction force.

Further, since the movable core and the movable member are in contact with each other by the contact concave surface and the contact convex surface, the contact convex surface is guided to the center of the contact concave surface along the contact concave surface. Therefore, the contact portion between the movable core and the movable member hardly shifts.
Further, between the outer peripheral side surface of the movable core and the inner peripheral side surface of the accommodating member, the movable core can be inclined with respect to the axis line along the reciprocating direction with the contact point between the contact concave surface and the contact convex surface as the support point. A gap is formed. When there is an axis shift between the accommodation member and the suction member, the movable core tilts in accordance with the axis shift.

Therefore, even if an axial deviation occurs between the accommodating member and the suction member, the facing concave portion formed in one of the movable core or the suction member and the other of the movable core or the suction member are in a direction orthogonal to the axis. There is almost no change in the gap formed in. Therefore, the shortest distance between the other of the movable core or the suction member and the facing recess can be minimized without the other of the movable core or the suction member contacting the facing recess. Further, the side gap between the housing member and the movable core can also be made as small as possible to the extent that the movable core is inclined according to the axial deviation between the housing member and the suction member. Since the magnetic attraction force acting between the movable core and the attraction member is increased as a whole, the solenoid valve device can be downsized. Further, since the movable core is tilted to absorb the axial deviation between the accommodation member and the suction member, high precision is not required for processing and assembling each component. Therefore, the manufacturing cost is reduced.

According to the solenoid valve device of the third aspect of the present invention, the fitting projection is fitted in the fitting recess so that the movable member can be tilted with respect to the axis. Even if the movable core and the movable member are moved away from each other due to an impact load due to some reason and the fitting projection comes out of the fitting recess, as long as the fitting projection is located in the contact concave surface, the fitting projection is guided to the contact concave surface. The abutting portion is refitted into the fitting concave portion.
Therefore, the contact state between the movable core and the movable member can be maintained.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an example in which the solenoid valve device according to one embodiment of the present invention is used in a hydraulic control valve device of an automatic transmission. The electromagnetic valve device 10 shown in FIG. 1 is an electromagnetic three-way valve device that controls the hydraulic pressure of hydraulic oil supplied to a clutch or a brake that is an engagement device of an automatic transmission. The yoke 12, the housing member 14, the base housing 20, and the movable core 30 are made of a magnetic material and constitute a magnetic circuit of the electromagnetic valve device 10. The accommodating member 14 is sandwiched between the yoke 12 and the cover 16 and fixed to the yoke 12 by caulking.

The base housing 20 has a suction portion 22 as a suction member that supports the shaft 40 so as to be reciprocally movable.
And the port portion 28 forming the inflow port 70, the control port 72 and the drain port 74 are integrally formed. The inflow port 70, the control port 72, and the drain port 74 form the flow path described in the claims. The inflow port 70 is connected to a high-pressure hydraulic pressure supply source, the control port 72 is connected to a clutch or brake of an automatic transmission via an oil passage (not shown), and the drain port 74 is open to the low-pressure drain side.

The suction part 22 is installed facing the movable core 30 on one side of the movable core 30 in the reciprocating direction of the movable core 30. A cylindrical facing recess 24 is formed at the end of the suction portion 22 on the movable core 30 side. Suction part 2
The inner peripheral wall 2 supports the shaft 40 so as to be reciprocally movable. That is, the suction portion 22 also serves as a bearing member for the shaft 40.

The movable core 30 is supported on the inner peripheral side surface of the accommodating member 14 so as to be capable of reciprocating. The side gap formed by the inner peripheral side surface of the accommodating member 14 and the outer peripheral side surface of the movable core 30 is a movable core with respect to the axis 90 along the reciprocating direction of the movable core 30 due to the axis shift between the accommodating member 14 and the suction portion 22. The size is set so that 30 can be tilted.

The inner peripheral side surface of the accommodating member 14 and the movable core 3
It is desirable to reduce the sliding resistance between the housing member 14 and the movable core 30 by forming a non-magnetic film on at least one of the outer peripheral side surfaces of No. 0 by nickel plating or the like. If the sliding resistance between the housing member 14 and the movable core 30 is acceptable, it is not necessary to form the non-magnetic film. The movable core 30 is formed in a cylindrical shape, and is open on both sides in the axis 90 direction. A conical concave surface 32 as a contact concave surface is formed on the shaft 40 side of the movable core 30. The fitting hole 34 is formed by further recessing from the conical concave surface 32.

The shaft 40 is installed on one side of the movable core 30 in the reciprocating direction. The shaft 40 is inserted through the suction portion 22, is supported by the inner wall of the suction portion 22 so as to be capable of reciprocating, and is not tiltable with respect to the axis 90. The shaft 40 constitutes a movable member together with a ball 50 described later. On the movable core 30 side of the shaft 40,
A spherical surface 42 is formed as a contact convex surface. Spherical surface 42
Is in contact with the conical concave surface 32 of the movable core 30. The fitting protrusion 44 projects from the spherical surface 42 and fits in the fitting hole 34. Fitting hole 34 formed around fitting projection 44
The distance between and is set to a size such that the movable core 30 can be tilted with respect to the axis 90 due to the axis shift between the housing member 14 and the suction portion 22. The shaft 40 is urged toward the movable core 30 in the other reciprocating direction of the movable core 30 by the urging force of a spring 48 as an urging means.

The ball 50 is subjected to pressure toward the shaft 40 by the hydraulic oil flowing from the inflow port 70. The valve seat member 52 is attached to the inner wall of the port portion 28. The valve seat member 52 has a valve seat 54, and the ball 50 can be seated on the valve seat 54. The filter 58 is the valve seat member 5
It is attached to the second inflow port 70 side and removes foreign matter in the hydraulic oil. The coil 60, which serves as an electromagnetic drive unit and is wound around the bobbin 62, is arranged so as to surround the outer periphery of the housing member 14 and the suction unit 22.

Next, the operation of the solenoid valve device 1 will be described. When the coil 60 is not energized, the shaft 40 is urged upward in FIG. 1 toward the movable core 30 by the urging force of the spring 48. The ball 50 is seated on the valve seat 56 formed on the inner wall of the port portion 28 by the pressure of the hydraulic oil flowing from the inflow port 70. In this state, the shaft 40 and the ball 50 are not in contact with each other. Inflow port 70
The hydraulic oil flowing in from is supplied from the control port 72 to the clutch or brake of the automatic transmission, so that the clutch or brake is in the engaged state.

When the coil 60 is energized, the spring 4
The movable core 30 is sucked toward the suction portion 22 against the urging force of 8. Since the shaft 40 moves downward in FIG. 1 together with the movable core 30 and contacts the ball 50, the ball 50 is separated from the valve seat 56 and seated on the valve seat 54. Control port 7
Since 2 and the drain port 74 communicate with each other, the hydraulic oil supplied to the clutch or brake of the automatic transmission is discharged from the drain port 74, and the hydraulic pressure applied to the clutch or brake is reduced. Therefore, the clutch or brake is released. By controlling the duty ratio of the control current supplied to the coil 60 by an engine control device (not shown), the hydraulic pressure applied to the clutch or brake connected to the control port 72 is adjusted and the engagement state of the clutch or brake is controlled.

In this embodiment, the facing recess 24 of the suction part 22 is provided.
When the main gap formed between the bottom surface of the movable core 30 and the movable core 30 in the reciprocating direction of the movable core 30 is large, the facing concave portion 2
The shortest distance between the inner peripheral side surface 26 of 4 and the movable core 30 is small. Therefore, when the main gap is large, the movable core 3
The magnetic attraction force acting between 0 and the attraction unit 22 increases. Even if the movable core 30 approaches the attracting portion 22 side, the shortest distance between the inner peripheral side surface 26 of the facing recessed portion 24 and the movable core 30 hardly changes. Therefore, the magnetic attraction force acting between the movable core 30 and the attracting portion 22 is It is almost constant.

Since the shaft 40 is constantly biased toward the movable core 30 by the spring 48, the spherical surface 42 of the shaft 40 is guided by the conical concave surface 32 to the center of the conical concave surface 32. Therefore, the contact portion between the movable core 30 and the shaft 40 hardly changes. Even if the movable core 30 receives a force in the direction orthogonal to the axis 90 from the accommodating member 14, an axial deviation occurs between the accommodating member 14 and the suction portion 22 due to a processing error or an assembling error of parts. Since 32 guides the spherical surface 42 to the center of the conical concave surface 32, the contact point between the movable core 30 and the shaft 40 does not change, and the movable core 30 supports the contact point between the conical concave surface 32 and the spherical surface 42. Is inclined with respect to the axis 90. Therefore, even if the housing member 14 and the suction portion 22 are misaligned with each other, the gap between the inner peripheral side surface 26 of the facing recessed portion 24 and the movable core 30 hardly changes over the entire circumference, and the inner peripheral side surface 26 and It does not come into contact with the movable core 30. Therefore, the gap between the inner peripheral side surface 26 of the facing recess 24 and the movable core 30 can be minimized.

The side gap formed between the inner peripheral side surface of the accommodating member 14 and the outer peripheral side surface of the movable core 30 is different from the axis 90 when the accommodating member 14 and the suction portion 22 are misaligned. The movable core 30 need only be large enough to be tilted, and can be made as small as possible. Therefore, the magnetic attraction force acting between the movable core 30 and the attraction portion 22 becomes large as a whole. Therefore, the curve 12 of FIG.
As shown in 0, the magnetic attraction force is almost constant regardless of the size of the main gap, and the magnetic attraction force becomes large as a whole. Since the magnetic attraction force increases without increasing the number of turns of the coil 60, the electromagnetic valve device can be downsized.

In the above-described embodiment of the present invention described above, the conical concave surface 32 as the contact concave surface is formed on the movable core 30,
A spherical surface 42 as a contact convex surface is formed on the shaft 40.
The movable core may be formed with a contact convex surface, and the shaft may be formed with a contact concave surface. Further, the suction recess 22 is formed with the opposed recess 24 so that the movable core 30 enters the opposed recess 24. On the other hand, the facing recess may be formed in the movable core.

Depending on the construction of the solenoid valve device, the shaft 40 may be supported by the bearing part which is a member separate from the suction part so as to be reciprocally movable, instead of directly bearing the shaft 40 by the suction part. Further, in the above embodiment, the solenoid valve device of the present invention is used for the three-way valve as the pressure control valve device used in the automatic transmission. Besides this, the solenoid valve device of the present invention can be used as a two-way valve or a flow control valve device.

[Brief description of drawings]

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

FIG. 2 is a characteristic diagram showing a relationship between a main gap and a magnetic attraction force between this embodiment and a conventional example.

FIG. 3 is a schematic cross-sectional view showing a main part of Conventional Example 1.

FIG. 4 is a schematic cross-sectional view showing a main part of Conventional Example 2.

FIG. 5 is a schematic cross-sectional view showing a main part of Conventional Example 3.

[Explanation of symbols]

10 Solenoid valve device 12 York 14 Housing member 20 base housing 22 Suction part (suction member, bearing member) 24 Opposing recess 26 Inner peripheral side 30 movable cores 32 Conical concave surface (contact concave surface) 34 Mating hole 40 shaft (movable member) 42 spherical surface (abutting convex surface) 44 Mating protrusion 48 spring (biasing means) 50 balls (movable member) 60 coils (electromagnetic drive unit) 90 axis

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 3H106 DA08 DA23 DB02 DB12 DB22                       DB32 DC04 DC18 DD09 EE34                       EE35 GA15 GA25 GB01 KK03                       KK17 KK22

Claims (3)

[Claims] 1. A movable core that reciprocates in a linear direction, and a movable core that is installed on one side of the movable core in the reciprocating direction, abuts on the movable core and reciprocates together with the movable core,
A movable member that opens and closes the flow path, a bearing member that reciprocally supports the movable member, an accommodating member that reciprocally supports the movable core, and the one side of the movable core in the reciprocating direction. A suction member that is installed to face the movable core and forms a magnetic circuit with the movable core and the containing member, and an urging means that urges the movable member toward the other of the reciprocating direction toward the movable core. And an electromagnetic drive unit that generates a magnetic force that attracts the movable core in one of the reciprocating directions toward the attraction member by energizing the electromagnetic valve device, wherein one of the movable core and the attraction member is provided. Has an opposed recess on the side facing the other, and when the movable core moves in one of the reciprocating directions toward the suction member, the other of the movable core and the suction member is in the opposed recess. At the contact point between the movable core and the movable member, one of the movable core and the movable member has a contact concave surface, and the other of the movable core and the movable member contacts the contact concave surface. A contact convex surface is in contact, and between the outer peripheral side surface of the movable core and the inner peripheral side surface of the accommodating member along the reciprocating direction with the contact point between the contact concave surface and the contact convex surface as a support point. A solenoid valve device, wherein a gap is formed so that the movable core can be tilted with respect to the axis. 2. The solenoid valve device according to claim 1, wherein the contact concave surface is a conical concave surface, and the contact convex surface is a spherical surface. 3. One of the movable core and the movable member has a fitting hole further recessed from the contact concave surface, and the other of the movable core and the movable member protrudes from the contact convex surface. 3. The solenoid valve device according to claim 1, further comprising a protrusion, wherein the fitting protrusion is fitted into the fitting recess such that the movable member can be tilted with respect to the axis.