JP2001304446A - Solenoid valve - Google Patents

Abstract

(57) [Problem] To provide an electromagnetic valve having a configuration suitable for fixing an electromagnetic coil by scissors while securing the strength of the electromagnetic coil. SOLUTION: A first support member 21 or a second support member 25 is fixed to an electromagnetic coil 10 fixed by scissors by a first support member 21 and a second support member 25 forming a stator core 20. Since the plurality of protrusions 13a are provided at an end portion that contacts at least one of the support members 25, the protrusions 13a are more easily deformed by a compressive force than the other electromagnetic coils 20. Therefore, the functions of the winding 12 and the connector 14 housed in the other electromagnetic coil 10 can be prevented from directly applying the compressive force generated when the electromagnetic coil 10 is sandwiched between the stator cores 20. Damage can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a solenoid valve.

[0002]

2. Description of the Related Art After winding on a spool, an electromagnetic coil formed by integrating the spool and connector with resin is fixed to a yoke and a housing, which are other members (fixed iron core) constituting a magnetic circuit. 2. Description of the Related Art A solenoid valve is known (for example, JP-A-11-132127).

[0003]

In the conventional structure, depending on the dimensional accuracy of the electromagnetic coil and other members (yoke and housing) into which the electromagnetic coil is scissored, the electromagnetic coil and the other members with which the electromagnetic coil abuts after assembly. , Or may be compressed by another member.

In the case where there is a gap, for example, noise may be generated due to vibration of an engine or the like to which the solenoid valve is attached, or wear may occur, leading to breakage. In the case where the electromagnetic coil is compressed by another member, the electromagnetic coil may be damaged due to a difference in thermal expansion between the resin and the metal due to the compressive stress.

In order to solve these problems, a high accuracy is required for the electromagnetic coil and other members, so that there is a problem that the manufacturing cost is high.

The present invention has been made in view of such circumstances, and has as its object to provide an electromagnetic valve having a structure suitable for fixing the electromagnetic coil by scissors while securing the strength of the electromagnetic coil. Is to provide.

[0007]

According to a first aspect of the present invention, in a configuration in which an electromagnetic coil is sandwiched between a first support member and a second support member forming a stator core,
At least one of the support member and the second support member is in contact with the electromagnetic coil via a plurality of protrusions formed at the end of the electromagnetic coil. For this reason, when a compression force is applied to the electromagnetic coil sandwiched by the stator cores, the protrusion is more likely to be deformed by the compression force than other electromagnetic coil portions. As a result, it is possible to prevent a compressive force from being directly applied to the functions of the windings, connectors, and the like housed in other electromagnetic coil portions.

Further, according to the second aspect of the present invention, the height of the electromagnetic coil having the protrusion is formed so as to be higher than the height previously sandwiched between the first support member and the second support member. In addition, the electromagnetic coil is connected to the first support member and the second support member.
By using a structure sandwiched between the first and second support members, the gap between the first and second support members and the electromagnetic coil can be prevented from being generated due to variations in component accuracy. In addition, when the electromagnetic coil is sandwiched between the first support member and the second support member and assembled, the protrusion is set to be easily deformed as compared with other electromagnetic coil portions. As in the item 1, it is possible to prevent a compressive force from being directly applied to the functions of the windings, connectors, and the like housed in the other electromagnetic coil portions. The height of the preformed electromagnetic coil is desirably set to such a degree that no gap is generated due to a variation in component accuracy.

According to the third and fourth aspects of the present invention, at least one of the plurality of protrusions is provided on the first support member or the second support member which is a stator core for sandwiching and fixing the electromagnetic coil. By disposing a concave portion that engages with this projection at a position facing one projection, the electromagnetic coil can be positioned relative to the stator core by engaging the concave portion with the projection.

[0010] If the electromagnetic coil is positioned between the accommodating portion of the first support member and the above-described portion, the positioning can be reliably performed.

According to the fourth aspect, since a part of the accommodating portion for accommodating the mover is formed of a non-magnetic material, the suction force for attracting the mover can be increased.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a solenoid valve according to an embodiment of the present invention.

(First Embodiment) FIG. 1 is an axial sectional view showing the structure of a solenoid valve according to the present invention. As shown in FIG. 1, the electromagnetic valve 1 includes an electromagnetic coil 10, a stator core 20, a mover 30, a valve body 40, a valve seat member (hereinafter, referred to as a valve body) 50, and the like.

The electromagnetic coil 10 includes a spool 11, a winding 12, and a coil cover 13. The resin-made spool 11 is wound with the winding 12, and the spool 11 and the winding 12 are formed secondarily by the resin-made coil cover 13. At this time, the resin connector 14
It is formed integrally with the coil cover 13. The connector 14 is provided with a terminal 15 that is electrically connected to an end of the winding 12 in order to energize the electromagnetic coil 10.

The spool 11 preferably has a concave cross section so as to accommodate the winding 12, and is provided with an annular projection 11p as shown in FIG. When performing the above-mentioned secondary molding, the annular projection 11p
Since the adhesion between the resins can be increased by melting the annular projection 11p, the airtightness of the spool accommodating the winding can be improved. For details of the electromagnetic coil 10,
It will be described later.

The stator core 20 includes a first support member 21 and a second support member 25, and accommodates the electromagnetic coil 10 that generates an attractive force when energized, and includes a movable element 30 described later. A magnetic circuit through which magnetic flux flows is formed.

The first support member (hereinafter, referred to as a flange portion) 21 includes a flange 22 made of a magnetic material, an intermediate member 23 made of a non-magnetic material, and a suction member 24 made of a magnetic material. The flange 22 has a substantially flat plate shape with a hollow center,
A plurality of guide holes 29 into which fixing bolts and the like are screwed are provided so that the electromagnetic valve 1 of the present invention can be accommodated and fixed in, for example, a fuel supply device.

The intermediate member 23 has an annular shape and is formed integrally with the substantially cylindrical suction member 24 and the hollow end 22a of the flange 22 by welding or the like. Thereby, the integral part (hereinafter, referred to as a housing part) 28 of the suction member 24, the intermediate part member 23, and the flange 22 can house the mover 30 in a fuel-tight manner.

Since the intermediate member 23 made of a non-magnetic material is disposed at a radial position facing the mover 30, when the magnetic coil 10 is energized by energizing, the magnetic flux is generated by the flange 22, the second In the order of the support member 25 and the suction member 24,
A magnetic circuit flowing through the mover 30 can be formed. For this reason,
By making it difficult for the magnetic flux to flow to the intermediate member 23, the magnetic flux can flow more from the attraction member 24 to the mover 30, and the suction force for attracting the mover 40 can be increased.

The second support member (hereinafter, referred to as a valve housing) 25 has a shape in which a part of a peripheral surface of a bottomed cylinder is cut out, and one end 25a is fixed to the flange portion 21 by welding or the like. You. A fitting hole 25b is provided in the center of the valve housing 25, and the fitting hole 25b fits the suction member 24 of the flange portion 21. In addition, if the connector part 14 integrally formed with the electromagnetic coil 10 is made to protrude radially into the opening part 25c formed by the above-mentioned notch, the connection between the connector 14 and a harness (not shown) is made. It is possible to set the size and shape of the connector 14 that facilitates work.

The mover 30 is substantially cylindrical, and
8 can be slidably moved in the axial direction. A biasing spring 60 for biasing a valve element 40 described later in the valve opening direction is disposed in the axial direction between the mover 30 and the suction member 24. Bottom holes 30a and 24a for holding the biasing spring 60 are provided. The urging spring 60 urges the mover 30 in a valve opening direction (a direction away from the suction member 24) opposite to the suction direction. Thus, when no power is supplied, the urging force of the urging spring 60 can move the valve element 40 engaged with the movable element 30 in the valve opening direction.

The electromagnetic coil 10 and the stator core 2
0 and the mover 30 form a so-called electromagnetic drive unit 1S.

Next, the valve element 40 is fixed to the movable element 30 by welding or the like, and is held in a valve hole 51 of the valve body 50 so as to be slidable in the axial direction. Note that a large diameter portion 43 is provided at the lower end of the valve body 40.

The valve body 50 has a flange 2
A valve hole 51 which is fixed to the substantially annular projecting portion 22b by welding or the like and is disposed coaxially with the inner peripheral wall of the housing portion 28 and passes therethrough is provided. Thereby, the valve element 40 can move integrally with the mover 30.

Further, the valve body 50 has a plurality of fuel inlet holes 52 for radially communicating the outer periphery thereof with the valve holes 51.
And a valve seat 53 formed on the lower end side of the valve hole 51 so as to surround the outer periphery of the opening. The valve seat surface 5 of the valve seat 53
3a faces the valve seat contact surface 43a of the large diameter portion 43 formed at the lower end of the valve body 40 so as to be able to be separated and separated. In addition,
The valve body 40 and the valve body 50 form a so-called ON-OFF control poppet valve portion 1B.

When the valve body 50 is not energized,
A stopper plate 70 that regulates a lift amount for moving the valve body 40 in the valve opening direction by the urging spring 60 is held in the valve body 50. The stopper plate 70 is provided with a notch 70a on the outer periphery thereof so that the fuel inlet hole 52 is provided.
It is possible to take out the fuel introduced from through the fuel reservoir BG of the valve hole 51, and from the cutout portion 70a forming the fuel passage.

The shape of the electromagnetic coil of the present invention will be described below.
This will be described with reference to FIGS. FIG. 2 shows the electromagnetic coil 1
0 is an axial sectional view, and FIG. 3 is a plan view thereof. FIG.
As shown in (1), the electromagnetic coil 10 has a plurality of protrusions 13a provided at an end portion that contacts the valve housing 25. The protrusion 13a is integrally formed with the coil cover 13 made of resin. Axial height Hc of the electromagnetic coil 10 shown in FIG.
Is formed higher in advance than an axial height Hs sandwiched between the flange portion 21 and the valve housing 25 shown in FIG. The height Hs is desirably set to such a height that no gap is generated due to a variation in component accuracy described later.

The projection 13a has a cross section of the projection 13a in contact with the valve housing 25 to such an extent that the projection 13a is easily deformed as compared with other members forming the electromagnetic coil 10.

In the manufacturing process of the electromagnetic driving device 1S, the valve housing 25 is fitted into the housing portion 28 of the flange portion 21 and the valve housing 25 is fixed below the flange portion 21 until the height becomes Hs. Since the protrusion 13a, which is easily deformed as compared with the member forming the other electromagnetic coil 10, is deformed first, the compressive force is directly applied to the winding 12 and the connector 14 housed in other portions of the electromagnetic coil 10. You can not join. Therefore, it is possible to prevent the function of generating the attractive force of the electromagnetic coil 10 from being damaged.

If the height Hc of the electromagnetic coil 10 is set to be higher than the height Hs in consideration of the accuracy of the components of the electromagnetic coil 10, the flange portion 21, and the valve housing 25, the electromagnetic coil 10 and the flange portion may vary due to manufacturing variations. 21. The generation of an axial gap between the valve housing and the valve housing can be prevented. For this reason, it is possible to prevent noise and wear caused by vibrations and the like caused by the gap. Further, since the problem can be solved only by integrally forming the resin protrusions 13a on the electromagnetic coil 10 without manufacturing with high precision of the parts, an inexpensive manufacturing cost can be achieved.

In the solenoid valve 1 of the present embodiment, the projection 13a
Is provided on the end of the electromagnetic coil 10 in contact with the valve housing 25, specifically, on the upper surface of the resin coil cover 13, but the end of the electromagnetic coil 10 in contact with the flange 21, that is, the coil The same effect as that of the present embodiment can be obtained by providing the cover 13 at the lower bottom surface or at both ends.

Next, the operation of the solenoid valve 1 will be described below. First, the operation of the electromagnetic drive unit 1S will be described.
When a current is supplied to the terminal 15 of the connector 14 in order to energize the electromagnetic coil 10, a magnetic flux is generated in the electromagnetic coil 10, and the flange portion 21 forming the stator core 20, the valve housing 25, and the mover 30 Magnetic flux flows through the configured magnetic circuit, and a magnetic attraction force for attracting the mover 30 is generated between the attracting member 24 formed on the flange portion 21 and the mover 30. At this time, the flange 21
Since the intermediate member 23 is formed of a non-magnetic material at a part of the accommodation part 28 formed at a radial position facing the movable element, the magnetic flux does not easily flow through the accommodation part 28, and the suction member 24 Since the magnetic flux can be concentrated, the attraction force for attracting the mover 10 can be increased.

In the solenoid valve 1 of the present invention, a plurality of projections 1 are provided at the axial end of the electromagnetic coil 10 housed in the stator core 20.
3a, the protrusion 13a is set to be more easily deformed than the other members of the electromagnetic coil 10. Therefore, the resin (electromagnetic coil 1
0) and the metal (the stator core 20 formed of a magnetic material or the like) can prevent the electromagnetic coil 10 from being damaged due to thermal deformation due to a difference in thermal expansion between the coils. Damage to the function of the unit 1S can be prevented.

Next, the operation of the ON-OFF control valve section 1B will be described separately for the case where the electromagnetic drive section 1S is not energized and the case where the electromagnetic drive section 1S is energized.

(1) When not energized The urging spring 60 for urging the mover 30 is
Is moved in the valve opening direction, and the valve body 40 is pressed against the stopper plate 70 that regulates the lift amount of the valve body 40 when the valve is opened.
As a result, the valve seat contact surface 43a of the valve body 40 is separated from the valve seat surface 53a of the valve body 50.
The fuel introduced from 3 is led out of the notch 70a of the stopper plate 70 via the fuel reservoir BG of the valve hole 51.

(2) At the time of energization When the electromagnetic coil 10 is energized, a magnetic flux that generates an attractive force is generated in the electromagnetic coil 10, and the stator core 20 and the mover 30
A magnetic circuit in which a magnetic flux flows is formed between
Moves in the direction to close the gap with the suction member 24 by the magnetic attraction force against the biasing force of the biasing spring 60. Thereby, the valve seat contact surface 43a of the valve body 40 comes into contact with the valve seat surface 53a of the valve body 50, and the valve is closed.

(Second Embodiment) The structure of a solenoid valve according to an embodiment of the present invention will be described below with reference to FIG. FIG.
FIG. 2 is an axial cross-sectional view illustrating a structure of a solenoid valve. The first embodiment is different from the first embodiment in that, among the plurality of protrusions 13a, a concave portion that engages with the protrusion 13a (1) is provided at the position of the valve housing 25 facing the at least one protrusion 13a (1) or the flange portion 21. That is different. As shown in FIG. 4, a recess 25d is provided in the valve housing 25 at a position facing the projection 13a (1). Thereby, the projection 13a (1)
The engagement with the concave portion 25d allows positioning of the electromagnetic coil 10 in the circumferential direction.

With the above-described structure, the same effect as that of the solenoid valve of the first embodiment can be obtained.

When the solenoid valve 1 of the present invention is used for the high-pressure fluid control solenoid valve, the airtightness below the fuel inlet hole 52 is formed in the valve body 50 as shown in FIG. It is desirable that the O-ring 151 and the backup ring 152 be arranged by providing the groove 50p. Note that the airtightness above the fuel inlet hole 52 may be achieved by, for example, bringing an O-ring (not shown) into close contact with the end face 22p of the flange 22 for airtightness.

The solenoid valve embodied in this embodiment has an ON-
Although the structure of the OFF control valve has been described, if the electromagnetic drive unit of the solenoid valve is constituted by an electromagnetic coil sandwiched and accommodated by a stator core composed of a plurality of stator core members, the present invention can be implemented. The same effect as in the embodiment can be obtained.

[Brief description of the drawings]

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

FIG. 2 is an axial sectional view of the electromagnetic coil in FIG.

FIG. 3 is a plan view of the electromagnetic coil in FIG. 1;

FIG. 4 is an axial sectional view showing a structure of a solenoid valve according to a second embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Electromagnetic valve 1S Electromagnetic drive part 1B Valve part 10 Electromagnetic coil 11 Winding 12 Spool 13 Coil cover 13a Projection 14 Connector 20 Fixed iron core 21 First support member (flange part) 22 Flange 23 Intermediate member formed of nonmagnetic material 24 Suction Member 25 Second Support Member (Valve Housing) 25c Opening 25d Concave 28 Housing (formed of first support member, movable element 30
29) guide hole 30 mover 40 valve element 50 valve seat member (valve body) 51 valve hole 52 fuel inlet hole 60 biasing spring 70 stopper plate

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Hiroshi Inoue 1-1-1, Showa-cho, Kariya-shi, Aichi F-term in DENSO Corporation (Reference) 3H106 DA07 DA12 DA23 DB02 DB12 DB23 DB32 DC02 DD04 EE29 GA08 GA10 GA13 KK18

Claims (4)

[Claims] 1. A stator core for accommodating an electromagnetic coil for generating an attractive force, a slidable movable member accommodated in the stator core, a valve hole fixed to the stator core, a valve hole and the valve. A valve body having a fuel inlet hole for introducing fuel into the hole, a valve body slidably held in the valve hole, and reciprocating with the mover to open and close the valve hole; An electromagnetic valve having an urging spring for urging the mover in a direction in which a body opens, wherein the stator iron core sandwiches the electromagnetic coil, forms a first support member and And at least one of the first support member and the second support member and the electromagnetic coil are in contact with each other via a plurality of protrusions formed at an end of the electromagnetic coil. A solenoid valve. 2. The method according to claim 1, wherein the plurality of protrusions have a height higher than a height between the first support member and the second support member.
The electromagnetic valve according to claim 1, wherein the electromagnetic coil is formed in advance so as to increase the height of the electromagnetic coil, and the electromagnetic coil is interposed therebetween. 3. The first support member or the second support member located at a position facing at least one of the plurality of protrusions has a recess for engaging the protrusion. The solenoid valve according to claim 2, wherein: 4. A plurality of guide holes screwed into a fuel supply device having an accommodation portion accommodating the mover in an axially movable manner and an accommodation hole accommodating the solenoid valve. The solenoid valve according to any one of claims 1 to 3, further comprising: a part of the housing portion is made of a non-magnetic material.