JP2003314729A - Solenoid valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stabilize the opening/closing operation of a valve element, to improve the reliability of a solenoid valve, and also to reduce magnetic energy loss. <P>SOLUTION: An annular elastic plate 19 for maintaining the opening/closing of the valve element 18 is arranged between the abutting surface 14B of a channel forming body 14 and the annular step part 15B of an actuator case 15 on one side of a casing 11. A pair of valve element attracting parts 26A, 26A for sandwiching the lower end side of a core member 23 from both sides through a clearance S in the radial direction is arranged on the opposite yokes 26, 26 of a yoke member 25 for composing an electromagnetic actuator 21 together with the core member 23 and an electromagnetic coil 24. These valve element attracting parts 26A are axially faced to the magnetic plate 18A of the valve element 18 through an axial gap G smaller than the clearance S in the radial direction. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve preferably used as a purge control valve for a vehicle engine, for example.

[0002]

2. Description of the Related Art Generally, an engine for a vehicle such as an automobile employs an evaporative purge system in order to prevent the fuel gas (evaporative gas) volatilized in a fuel tank from being released into the atmosphere. .

That is, in the evaporative purge system according to the prior art, the evaporative emission gas is temporarily stored in a container called a canister, and when the engine satisfies a predetermined operating condition, a purge control valve consisting of a solenoid valve is used. The valve is opened and the evaporative gas stored in the canister is used as a part of fuel.

In this case, an evaporative purge passage for circulating evaporative gas is provided between the intake passage of the engine and the canister, and a purge control valve is arranged in the middle of the evaporative purge passage. When the valve is opened, the purge control valve allows the evaporative gas from the canister to flow through the intake passage of the engine and burns the evaporative gas in the combustion chamber together with the mixture of fuel and intake air.

A conventional solenoid valve used as such a purge control valve will be described with reference to FIGS. 7 to 10.

Reference numeral 1 denotes a casing of a solenoid valve formed in a stepped cylindrical shape. Inside the casing 1, a core insertion hole 1A is formed, as shown in FIG.
A valve seat 1B, on which a valve body 4 described later is seated, is formed so as to be coaxial with a guide hole 1C that guides the valve body 4 so as to be axially displaceable.

Further, the inlet 2 is provided on one side of the casing 1.
Further, an outflow port 3 is provided so as to project in the radial direction, and the inflow port 2 and the outflow port 3 are communicated with each other or blocked in accordance with the opening and closing of the valve body 4. And these inflow port 2 and outflow port 3 comprise a part of evaporative purge passage used as a flow path of evaporative gas etc., for example.

Reference numeral 4 denotes a valve body provided displaceably in the guide hole 1C of the casing 1. The valve body 4 is formed as a cylindrical valve body made of, for example, an iron-based magnetic material. The valve element 4 is driven by an electromagnetic actuator 5 which will be described later to be seated on and seated on the valve seat 1B in the casing 1.

Reference numeral 5 denotes an electromagnetic actuator provided in the casing 1. The electromagnetic actuator 5 is composed of a core member 6, an electromagnetic coil 7 and a yoke member 8 which will be described later. The electromagnetic actuator 5 magnetically attracts the valve body 4 via the core member 6 and the yoke member 8 when the electromagnetic coil 7 is energized, and the valve body 4 is seated on the valve seat 1 of the casing 1.
The valve is separated from B (opened).

Reference numeral 6 denotes a rod-shaped core member made of a magnetic material such as an iron material and electromagnetic stainless steel. The core member 6 is inserted into the core insertion hole 1A of the casing 1 so that one side in the axial direction faces the valve body 4. Has been done. The other end 6A of the core member 6 projects axially from the core insertion hole 1A of the casing 1 and is fixed to a yoke frame 8A, which will be described later, by using caulking means or the like.

In this case, one end portion of the core member 6 is shown in FIG.
As illustrated in 0, the end face of the valve body 4 and the axial gap (hereinafter,
The axial direction gap Ga), and the valve body 4
The valve opening amount is regulated to a predetermined value (a lift amount corresponding to the axial gap Ga).

Reference numeral 7 denotes an electromagnetic coil which is located on the outer peripheral side of the core insertion hole 1A and is embedded in the inside of the casing 1. The electromagnetic coil 7 is excited by energization from the outside, and an arrow as illustrated in FIG. A magnetic path in the H direction shown is formed between the core member 6 and the yoke member 8 with the valve body 4 interposed therebetween.

Reference numeral 8 is a yoke member made of a magnetic material such as an iron plate or an electromagnetic stainless steel plate. The yoke member 8 is
As shown in FIGS. 7 to 9, a yoke frame 8A formed by bending the casing 1 in a substantially U shape so as to surround the casing 1 from the outside.
And a yoke plate 8B that is connected to one side (lower end side) of the yoke frame 8A and extends horizontally inside the casing 1.

In this case, the yoke plate 8B is formed as an annular plate made of a magnetic material, and its inner portion is located outside the guide hole 1C in the radial direction and is embedded in the casing 1 as shown in FIG. And the yoke plate 8
A radial gap (hereinafter referred to as a radial gap Gb) is formed between B and the valve body 4 as illustrated in FIG.

The solenoid valve as the purge control valve according to the prior art has the above-mentioned structure. First, when the electromagnetic coil 7 is energized from the outside, the electromagnetic coil 7 is excited to cause the yoke member 8 to move. A magnetic path in the direction of arrow H is formed between the yoke frame 8A, the yoke plate 8B and the core member 6 via the valve body 4 as shown in FIG.

Then, the valve body 4 is magnetically attracted toward the one end surface of the core member 6 by the magnetic force at this time, and is slidably displaced in the guide hole 1C of the casing 1 in the axial direction. As a result, the valve body 4 opens and contacts the end surface of the core member 6 to connect the inflow port 2 and the outflow port 3 to each other.

Therefore, the evaporative gas stored in the canister (not shown) of the engine flows from the inflow port 2 toward the outflow port 3 by opening the valve body 4, and the intake passage (not shown) of the engine. By being sucked into the combustion chamber of the engine, it is combusted together with the intake air.

[0018]

By the way, in the above-mentioned prior art, the core insertion hole 1A and the valve seat 1 are provided in the casing 1.
A guide hole 1C is formed between the guide hole 1B and B, and the valve body 4 is guided slidably in the axial direction within the guide hole 1C.

Therefore, when the valve body 4 is driven to open and close by the electromagnetic actuator 5, a frictional resistance is generated between the guide hole 1C of the casing 1 and the valve body 4, and the dimensional accuracy of the guide hole 1C and the like is increased. If the valve is not controlled strictly,
There is a problem that it is difficult to stabilize the valve closing operation, and the reliability as a solenoid valve cannot be improved.

In the yoke member 8 of the electromagnetic actuator 5, a radial gap Gb is formed between the yoke plate 8B and the valve body 4 over the entire circumference as shown in FIG. Then, this radial gap Gb is
A magnetic path in the direction of the arrow H is formed between the yoke plate 8B and the valve body 4 while maintaining a constant gap even when the valve is repeatedly opened and closed.

For this reason, the magnetic field generated by energizing the electromagnetic coil 7 acts by the radial gap Gb acting as a magnetic resistance, and when the valve body 4 is driven to open and close, a magnetic attraction force is applied to the valve. There is a problem that it cannot be applied efficiently to the body 4 and a large loss of magnetic energy occurs.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to stabilize the valve opening and closing operations of the valve body to improve reliability and reduce magnetic energy loss. It is to provide a solenoid valve that can be reduced.

[0023]

In order to solve the above-mentioned problems, the present invention provides a casing having a flow passage formed inside and a valve seat in the middle of the flow passage, and a displaceable member provided in the casing. And an electromagnetic actuator for driving the valve body, the electromagnetic actuator having one axial side facing the valve body and the other side axially in the casing. A rod-shaped core member extending in a direction, an electromagnetic coil surrounding the core member from the outside in the radial direction and provided in the casing, and an electromagnetic coil provided outside the electromagnetic coil and provided in the casing to the electromagnetic coil. Is applied to a solenoid valve having a yoke member that forms a magnetic path with the core member via a valve body when the current is energized.

The feature of the configuration adopted by the invention of claim 1 is that the casing has a plate-shaped valve body holding member that is attached to the casing on the outer peripheral side and holds the valve body on the inner peripheral side in a displaceable manner. The yoke member is provided with a valve body suction section that faces the valve body through an axial gap and magnetically attracts the valve body together with the core member when the electromagnetic coil is energized. It has been configured.

With this construction, the valve body can be held openably and closed by using the plate-shaped valve body holding member, and the guide hole for the valve body is provided in the casing as in the prior art. Since it is not necessary to provide the like, it is possible to prevent frictional resistance between the casing and the valve body when the valve body is opened and closed. Since the valve body suction portion provided on the yoke member faces the valve body in the axial direction through the axial gap, the valve body is magnetically coupled with the core member when the electromagnetic coil is energized. By suction, the valve body can be stably opened and closed.

According to the second aspect of the present invention, the valve body suction portion of the yoke member is arranged on the same plane as one axial end surface of the core member. This allows
The valve body suction portion of the yoke member can magnetically attract the valve body together with the core member via the axial gap.

According to the third aspect of the invention, the yoke members are arranged so as to face each other on the left and the right with the core member interposed therebetween, one end of which serves as a valve body suction portion, and the other side is connected to the core member. Each of the valve element suction portions of the yoke member is arranged to face each other with one axial side of the core member sandwiched from both sides in the radial direction, and a radial gap larger than the gap is formed between the core member and the core member. It is configured to be formed.

As a result, the pair of left and right valve body suction portions provided on the yoke member can be arranged on one axial side of the core member so as to face each other with a radial gap therebetween, and the radial gap allows each valve to be disposed. The body suction part and the core member can be magnetically insulated. In this state, since each valve body suction portion axially faces the valve body through a gap smaller than the radial gap, the valve body together with the core member when energizing the electromagnetic coil. The valve body can be stably opened and closed by magnetically sucking it.

Further, according to the invention of claim 4, between the casing and the valve body, the valve spring is located on the outer periphery of one side of the core member in the axial direction and constantly biases the valve body in the valve closing direction. The valve spring is configured to extend in the axial direction between each valve body suction portion of the yoke member and the core member via a radial gap.

Thus, a valve spring can be arranged between the casing and the valve body so as to extend in the axial direction of the core member, and the diameter formed between each valve body suction portion of the yoke member and the core member. The gap in the direction can be utilized as an insertion hole for the valve spring.

[0031]

BEST MODE FOR CARRYING OUT THE INVENTION A solenoid valve according to an embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 6, taking as an example a case where the solenoid valve is used as a purge control valve for a vehicle engine.

In the figure, reference numeral 11 denotes a solenoid valve casing formed of a resin material or the like. The casing 11 is located on one side (lower side) as shown in FIGS. 1 and 2, and has an inlet 12 and an outlet 13. Is formed by a flow path forming body 14 provided so as to project in the radial direction, and an actuator case 15 described later that is fitted and provided on the flow path forming body 14.

Here, the flow path forming body 14 has a center line O-
A cylindrical valve seat 14A is formed coaxially with O. Also,
The other (upper) end surface of the flow path forming body 14 has an annular abutment surface 14B for the actuator case 15 as shown in FIG.
The abutment surface 14B is formed so as to surround the valve seat 14A from the outside in the radial direction. And the valve seat 14A is
The valve body 18 and the core member 23, which will be described later, are arranged at positions axially opposed to each other, and the height of the end surface thereof is slightly lower than the abutting surface 14B.

An annular flow passage portion 14C is formed in the flow passage forming member 14 between the valve seat 14A and the abutting surface 14B, and the annular flow passage portion 14C is provided outside the valve seat 14A in FIG. It always communicates with the inflow port 12 shown in. Further, the inner portion of the valve seat 14A is an inner flow passage portion 14D formed of a bottomed hole, and the inner flow passage portion 14D is always in communication with the outflow port 13.

Reference numeral 15 denotes the casing 1 together with the flow path forming member 14.
In the actuator case constituting part 1, the actuator case 15 is formed of an insulating resin material or the like which is substantially the same as that of the flow path forming body 14, and surrounds an electromagnetic actuator 21 described later from the outside by means such as integral molding. It is a thing.

On one end (lower end) side of the actuator case 15, a fitting portion 15A fitted to the flow path forming body 14 from above and a fitting portion 15A located above the fitting portion 15A as shown in FIG. And an annular step portion 15B that projects radially inward and sandwiches an elastic plate 19 described later between the elastic plate 19 and an abutting surface 14B of the flow path forming body 14, and a core insertion hole 2 of a coil bobbin 22 described later.
2A and a cylindrical spring receiving portion 15C located coaxially with the coil bobbin 22 on the lower end side are integrally formed.

A connector portion 15D is integrally formed on the other side (upper side) of the actuator case 15 as shown in FIG. 1, and the connector portion 15D is provided to energize an electromagnetic coil 24 described later from the outside. Multiple terminal pins 16
(Only one is shown).

Reference numerals 17 and 17 denote left and right mounting brackets formed integrally with the actuator case 15. The mounting brackets 17 are located on the back side of the actuator case 15 as shown in FIGS. 12, outlet 13
It projects to the left and right almost parallel to. Then, the casing 11 is fixedly attached to a predetermined portion (not shown) on the engine side by these attachment brackets 17.

Reference numeral 18 denotes a valve element which is seated on and detached from the valve seat 14A of the flow path forming body 14. The valve element 18 is an annular magnetic plate 18A as shown in FIG. 2 and a magnetic plate formed integrally with the magnetic plate 18A. 1
The flat valve body is composed of an elastic valve portion 18B that partially covers the upper and lower surfaces of 8A. The elastic valve portion 18B is formed using an elastic resin material such as natural rubber or synthetic rubber.

The magnetic plate 18A of the valve body 18 is formed as an annular flat plate from a magnetic material such as iron material or electromagnetic stainless steel, and is provided between the core member 23 and each valve body suction portion 26A of the opposing yoke 26 described later. To form a closed magnetic circuit in the direction of arrow H1 illustrated in FIG. The valve body 18 is driven by an electromagnetic actuator 21 to be described later, so that the valve body 18 is seated on and off the valve seat 14A of the flow passage forming body 14 to communicate and block the annular flow passage portion 14C and the inner flow passage portion 14D. To do.

Further, the elastic valve portion 18B of the valve element 18 has the magnetic plate 18A and the valve seat 14A when seated on the valve seat 14A.
It has a function of air-tightly sealing with A and elastically buffering the collision of the magnetic plate 18A with the end surface of the core member 23 when it is separated from the valve seat 14A.

Reference numeral 19 denotes an elastic plate serving as a valve body holding member for movably holding the valve body 18 in the casing 11, and the elastic plate 19 is, for example, a thin metal plate having a spring property or a sheet-like elastic resin material. The magnetic plate 18A of the valve body 18 is displaceably held on its inner peripheral side.

The outer peripheral side of the elastic plate 19 extends radially outward along the abutting surface 14B of the flow path forming body 14 as shown in FIG.
It is attached so as to be sandwiched from above and below via an elastic ring 20 such as an O-ring between the abutting surface 14B and the abutting surface 14B.

The elastic plate 19 is disposed between the flow passage forming body 14 of the casing 11 and the actuator case 15 to form a movable partition wall made of, for example, a diaphragm, and the annular flow passage portion of the flow passage forming body 14. 14C and inner flow path 1
4D is opened and closed together with the valve element 18.

Reference numeral 21 is an electromagnetic actuator built in the actuator case 15 for driving the valve body 18 to open and close. The electromagnetic actuator 21 is a core member 2 described later.
3, an electromagnetic coil 24, a yoke member 25, and the like. The electromagnetic actuator 21 is integrally molded in the actuator case 15 by means of insert molding or the like.

Reference numeral 22 denotes a coil bobbin provided in the actuator case 15. The coil bobbin 22 is formed in a stepped cylindrical shape using, for example, an insulating resin material, and the inner peripheral side thereof serves as a core insertion hole 22A. There is. The core insertion hole 22A extends in the axial direction along the center line OO of the actuator case 15 and is arranged coaxially with the cylindrical spring receiving portion 15C.

Reference numeral 23 denotes a core insertion hole 22 of the coil bobbin 22.
The core member 23 is inserted into A, and the core member 23 is formed as a rod-shaped rod from a magnetic material such as iron material or electromagnetic stainless steel. Then, one axial side (lower end side) of the core member 23 projects downward from the core insertion hole 22A through the spring receiving portion 15C of the actuator case 15, and the projecting end thereof passes through the valve body 18 and a gap G described later. Face to face.

The other side (upper end side) in the axial direction of the core member 23 is a small diameter portion 23A protruding upward from the core insertion hole 22A, and the small diameter portion 23A is the connecting yoke 2 described later.
It is fitted in the fitting hole 27A of No. 7 and attached.

Reference numeral 24 denotes an electromagnetic coil wound around the outer circumference of the coil bobbin 22. The electromagnetic coil 24 is arranged outside the core member 23 in the radial direction together with the coil bobbin 22, and is surrounded by the actuator case 15 from the outside.
The electromagnetic coil 24 is connected to the terminal pin 16 shown in FIG. 1 and is excited by being externally supplied with power via the connector portion 15D.

Reference numeral 25 is a yoke member located outside the electromagnetic coil 24 and provided inside the actuator case 15.
As shown in FIGS. 2 and 5, the yoke member 25 includes a pair of opposed yokes 2 arranged to face each other with the core member 23 interposed therebetween.
6, 26 and a connecting yoke 27 described later.

The opposing yokes 26, 26 are formed by bending a magnetic metal plate such as an iron material or electromagnetic stainless steel into a substantially U shape as shown in FIG. 5, and the lower end side thereof is a core member. A pair of valve body suction portions 26A, 26A are arranged so as to face each other so as to sandwich the outer peripheral side of 23 from both sides with a radial gap S therebetween.

Here, the valve body suction portion 26 of the opposing yoke 26
A is formed as a substantially semicircular wide ring extending in an arc shape with the core member 23 as the center. The radial gap S between the pair of valve body suction portions 26A, 26A and the core member 23 is axially inserted along the outer periphery of the core member 23 by a valve spring 28, which will be described later, as shown in FIG. It also serves as the spring insertion hole.

Further, these valve body suction portions 26A face the magnetic plate 18A of the valve body 18 in the upper and lower directions (axial direction) through the axial gap G shown in FIGS. 2 and 6, and The axial gap G is set to a dimension (G <S) smaller than the radial gap S described above. Then, in each of the valve body suction portions 26A, the side facing the valve body 18 is the core member 23.
Is arranged on the same plane as the one end face (lower end face).

In this case, the pair of valve body suction parts 26A, 26
A and the core member 23 are magnetically insulated from each other by a radial gap S, and in this state, each valve body suction portion 26A is provided with the core member 23 together with the valve body 18 via the axial gap G.
The magnetic plate 18A is magnetically attracted. The axial gap G determines the lift amount (valve opening degree) of the valve body 18, and is the axial direction formed between the valve body 4 and the core member 6 according to the prior art illustrated in FIG. The gap size is set to be approximately equal to the gap Ga of

On the other hand, the other side of the opposing yoke 26 (upper end side)
Is substantially L having a width dimension smaller than that of the valve body suction portion 26A.
The bent portion 26B has a character shape, and the bent portion 26B is connected to a connecting yoke 27, which will be described later, by using welding means or the like.

Reference numeral 27 denotes a connecting yoke which constitutes a yoke member 25 together with a pair of opposing yokes 26, 26. The connecting yoke 27 is formed of a magnetic metal plate substantially similar to the opposing yoke 26, and the bent portion of the opposing yoke 26 is formed. It has a width dimension approximately equal to 26B. The connecting yoke 27 is joined between the bent portions 26B of the opposing yokes 26 and magnetically connects the bent portions 26B to the core member 23.

Further, a fitting hole 27A serving as a core insertion hole is formed in the middle portion in the length direction of the connecting yoke 27, and the small diameter portion 23A of the core member 23 is shown in FIG. 2 in the fitting hole 27A. It is fitted as shown. The electromagnetic actuator 21 including the core member 23, the electromagnetic coil 24, the yoke member 25, and the like has an arrow H1 as shown in FIG. 6 between the core member 23 and the yoke member 25 when the electromagnetic coil 24 is excited. Direction magnetic field (closed magnetic circuit) is applied to the magnetic plate 1 of the valve body 18.
8A.

At this time, the valve body 18 is magnetically attracted by the lower end side of the core member 23 and the valve body suction portion 26A of the opposing yoke 26 via the axial gap G, and resists the valve spring 28 described later. The opening and closing operations are performed. Also,
The elastic plate 19 holds the valve body 18 displaceably as shown in FIG. 2, and compensates for stable opening and closing operations of the valve body 18.

Reference numeral 28 is a valve spring for constantly urging the valve element 18 in the valve closing direction. The valve spring 28 is, as shown in FIG.
It is located on the outer peripheral side of 3 and is disposed between the spring receiving portion 15C of the actuator case 15 and the valve body 18. Then, the valve body 18 is seated on the valve seat 14A of the flow path forming body 14 by the urging force of the valve spring 28, and opens / closes between the annular flow path portion 14C and the inner flow path portion 14D. .

The purge control valve (solenoid valve) according to the present embodiment has the above-mentioned structure, and its operation will be described below.

First, when the energization of the electromagnetic coil 24 is stopped, the valve body 18 is continuously seated on the valve seat 14A by being biased by the valve spring 28 in the valve closing direction, and the inlet shown in FIG. A disconnection is made between 12 and the outlet 13. Therefore, evaporative gas generated in, for example, the fuel tank of the vehicle is retained in the state of being stored in the canister (neither is shown) of the engine.

Next, when the electromagnetic coil 24 is energized from the outside, an arrow H as shown in FIG. 6 is provided between the core member 23 and the yoke member 25 via the magnetic plate 18A of the valve body 18.
A closed magnetic circuit in one direction is formed. The valve body 18 includes the valve member suction portion 26 of the opposing yoke 26 and the lower end side of the core member 23.
A is magnetically attracted by A through the axial gap G, and is separated from the valve seat 14A against the valve spring 28, thereby connecting the inlet 12 and the outlet 13.

Therefore, the evaporative gas stored in the canister of the engine flows from the inflow port 12 shown in FIG. 1 toward the outflow port 13 by opening the valve body 18, and flows into the intake passage (not shown) of the engine. By being sucked, it is burned with the intake air in the combustion chamber of the engine.

Thus, according to the present embodiment, since the valve body 18 is held by the annular elastic plate 19 so that it can be opened and closed, the abutting surface of the flow path forming body 14 on one side of the casing 11. 14B and the annular step portion 15B of the actuator case 15 are sandwiched between the elastic plate 19 and the outer peripheral side of the elastic plate 19, and the valve body 18 is displaceably held on the inner peripheral side of the elastic plate 19. It is configured to do.

As a result, the valve body 18 can be held openably and closed by using the annular elastic plate 19 on one side of the casing 11, and the valve body 18 for the valve body 4 can be held in the casing 1 as in the prior art. It is not necessary to provide the guide hole 1C or the like. As a result, the casing 11 and the valve body 18 are opened and closed when the valve body 18 is opened and closed.
It is possible to prevent the generation of frictional resistance between and, and to stabilize and smooth the opening and closing operations of the valve element 18.

Further, the core member 23 and the electromagnetic coil 24
A yoke member 2 that constitutes an electromagnetic actuator 21 together with
5, the opposing yokes 26, 26 are provided with valve body suction portions 26A, 26A that magnetically attract the valve body 18 together with the core member 23 when the electromagnetic coil 24 is energized.

The valve body suction portions 26A are arranged so as to face each other so as to sandwich the lower end side of the core member 23 from both sides with a gap S in the radial direction therebetween. It is configured to face each other in the axial direction via a gap G having a size smaller than the gap S in the direction.

As a result, the radial gap Gb between the valve body 4 and the yoke plate 8B which acts as a magnetic resistance when the valve body 4 is driven to open and close as in the prior art shown in FIG.
Can be eliminated. When the electromagnetic coil 24 is energized, a gap between the core member 23 and the yoke member 25 may be
As shown in FIG. 5, a closed magnetic circuit in the direction of arrow H1 can be formed through the axial gap G smaller than the radial gap S and the magnetic plate 18A of the valve body 18.

Therefore, in the present embodiment, as shown in FIG.
As shown in FIG. 5, the valve element 18 can be magnetically attracted toward the lower surface (opposing surface) of the core member 23 and each valve element suction portion 26A through only the axial gap G, and the magnetic attraction force is applied to the valve element 18 Can be efficiently given to.

Therefore, in the present embodiment, the loss of magnetic energy can be suppressed to a small level, and the valve body 18 can be reliably opened and closed against the valve spring 28. Further, by holding the valve body 18 so that it can be opened and closed by using the annular elastic plate 19 and the like, it is possible to eliminate the influence of frictional resistance, etc. Can be suppressed.

Further, the valve body 18 can be composed of the magnetic plate 18A made of an annular flat plate and the elastic valve portion 18B made of a resin material, so that the weight of the valve body 18 as a whole can be reduced and the opening and closing of the valve body 18 can be achieved. The valve closing operation can be smoothed, and the durability and reliability of the solenoid valve can be reliably improved.

Further, the yoke member 25 forming a part of the electromagnetic actuator 21 can be integrally molded together with the core member 23 and the electromagnetic coil 24 in the actuator case 15 by means of insert molding or the like. Workability in manufacturing and assembling can be significantly improved.

In the above embodiment, the yoke member 2
5 is a pair of opposed yokes 26, 2 made of separate members.
6 and the connecting yoke 27 have been described as an example. However, the present invention is not limited to this, and for example, the pair of opposed yokes 26, 26 and the connecting yoke 27 may be integrally formed as a single member.

Further, in the above-described embodiment, for example, the inlet 1 is provided with respect to the flow path forming body 14 of the casing 11 shown in FIG.
The case where 2 is arranged on the right side and the outlet 13 is arranged on the left side has been described as an example. However, the present invention is not limited to this,
For example, the inflow port 12 and the outflow port 13 may be used in reverse, the inflow port may be disposed on the left side, and the outflow port may be disposed on the right side.

Further, in the above embodiment, the case where the solenoid valve is applied to the evaporative purge system for the vehicle as the purge control valve has been described as an example. However, the present invention is not limited to this, as long as it is a solenoid valve that opens and closes a gas or liquid flow path, and can be applied to solenoid valves in a wide range of fields.

[0076]

As described above in detail, according to the invention of claim 1, since the flow path is opened and closed together with the valve body, the valve body is displaceably held on the inner peripheral side and the outer peripheral side is the casing. A plate-shaped valve member holding member to be mounted is provided, and the yoke member is magnetically attracted together with the core member when the electromagnetic coil is energized. The yoke member faces the valve member via an axial gap. Since the valve body suction unit is provided, the valve body can be magnetically attracted toward the core member and the valve body suction unit side only through the axial gap, and the magnetic attraction force can be applied to the valve body. It can be applied efficiently, the loss of magnetic energy can be suppressed small, and the valve body can be opened and closed reliably. Further, by holding the valve element so that it can be opened and closed by using the plate-shaped valve element holding member, it is possible to eliminate the influence of frictional resistance and the like, and it is possible to smooth the opening and closing operations of the valve element. The durability and reliability of the solenoid valve can be reliably improved.

Further, according to the second aspect of the invention, since the valve body suction portion of the yoke member is arranged on substantially the same plane as the one end surface of the core member, the valve body suction portion of the yoke member is arranged. Can magnetically attract the valve element through the axial gap together with the core member, more efficiently apply the magnetic attraction force to the valve element, and further reduce the loss of magnetic energy. be able to.

According to the third aspect of the present invention, the pair of left and right valve body suction portions provided on the yoke member are arranged to face each other on one axial side of the core member with a radial gap therebetween. Therefore, the gaps in the radial direction can magnetically insulate the valve element suction portions and the core member. And
In this state, since each valve body suction portion axially faces the valve body through a gap smaller than the radial gap, the valve body and the core member are magnetically coupled together when the electromagnetic coil is energized. The valve body can be stably opened and closed by aspiration.

Further, according to the invention of claim 4,
A valve spring can be disposed between the casing and the valve element so as to extend in the axial direction of the core member, and a radial gap formed between the valve element suction portion of the yoke member and the core member It can be utilized as an insertion hole for a spring, and the valve spring can further stabilize the valve opening and closing operations.

[Brief description of drawings]

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

FIG. 2 is an enlarged cross-sectional view of the solenoid valve seen from the direction of arrows II-II in FIG.

FIG. 3 is an external view of the solenoid valve shown in FIG.

FIG. 4 is a plan view of the solenoid valve shown in FIG.

5 is an exploded perspective view showing a yoke member, a valve body and the like in FIG. 1 in an enlarged manner.

FIG. 6 is a configuration diagram of a magnetic circuit including the solenoid valve shown in FIG. 1.

FIG. 7 is a vertical sectional view showing a solenoid valve according to the prior art.

8 is an external view of the solenoid valve shown in FIG.

9 is a plan view of the solenoid valve shown in FIG. 8. FIG.

FIG. 10 is a configuration diagram of a magnetic circuit using a solenoid valve of a conventional technique.

[Explanation of symbols]

11 casing 12 Inlet 13 Outlet 14 Flow path forming body 14A valve seat 15 Actuator case 18 valve body 18A magnetic plate 19 Elastic plate (valve body holding member) 21 Electromagnetic actuator 22 coil bobbin 22A core insertion hole 23 Core member 24 electromagnetic coil 25 Yoke member 26 Opposing yoke 26A Valve body suction part 27 Connection yoke 28 valve spring G-axis gap S radial gap

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 3G044 BA32 GA02                 3H106 DA07 DA13 DA23 DB02 DB12                       DB26 DB32 DC02 DC17 DD02                       EE04 EE16 EE22 EE40 GA11                       GB10 KK17

Claims (4)

[Claims] 1. A casing having a flow passage formed inside thereof and having a valve seat in the middle of the flow passage, a valve element displaceably provided in the casing and seated on and off the valve seat, and the valve element is driven. And a rod-shaped core member whose one side in the axial direction faces the valve body and the other side extends in the casing in the axial direction, and the core member is radially outside. And an electromagnetic coil that is provided in the casing so as to be surrounded by the electromagnetic coil and a magnetic member that is provided outside the electromagnetic coil and that is provided in the casing and that energizes the electromagnetic coil via the valve body between the core member. A solenoid valve provided with a yoke member forming a passage, wherein the casing is provided with a plate-shaped valve body holding member having an outer peripheral side attached to the casing and displaceably holding the valve body on an inner peripheral side, Yo The valve member is provided with a valve body suction portion that faces the valve body through an axial gap and magnetically attracts the valve body together with the core member when the electromagnetic coil is energized. Solenoid valve characterized by. 2. The solenoid valve according to claim 1, wherein the valve body suction portion of the yoke member is arranged on substantially the same plane as one axial end surface of the core member. 3. The yoke member is arranged so as to face left and right with the core member interposed therebetween, one end of the yoke member serves as the valve body suction portion, and the other side is connected to the core member. Each valve body suction portion of the member is arranged to face each other with one axial side of the core member sandwiched from both sides in the radial direction, and forms a radial gap larger than the gap with the core member. The solenoid valve according to claim 1 or 2. 4. A valve spring is provided between the casing and the valve body, the valve spring being located on the outer periphery of one side of the core member in the axial direction and constantly urging the valve body in the valve closing direction. The solenoid valve according to claim 3, wherein the solenoid valve extends in the axial direction between the valve member suction portion of the yoke member and the core member via the radial gap.