JP3153430B2 - Solenoid valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve used for controlling various kinds of oil, pneumatic equipment and the like.

[0002]

2. Description of the Related Art FIG. 8 shows an example of a conventional solenoid valve of this type.

That is, this solenoid valve 100
When the solenoid body 101 is energized and de-energized, the plunger 102 in the solenoid body 101 is reciprocated and the rod 1 operatively connected to the plunger 102 is driven.
By moving a ball 104 as a valve body provided at the tip of the rod 103 back and forth through
This is a poppet type three-way valve that switches the pressure by moving the first valve seat 105 and the second valve seat 106 toward and away from each other.

[0004] The solenoid valve 100 includes a solenoid body 101 and a first valve seat 105 and a second valve seat 1 provided coaxially and integrally with the solenoid body 101.
And a valve main body 107 made of a magnetic material having a magnetic field No. 06.

[0005] A solenoid body 101 is made of a resin bobbin 110 having a case 108 having openings at both ends and a hollow portion 109 penetrating in the axial direction accommodated in the case 108.
And a coil 111 wound around the bobbin 110,
A body 112 inserted and fixed to one inner periphery of the hollow portion 109 and closing one open end of the case 108;
In the bobbin 110, a first terminal 113 for energizing the coil 111 is insert-molded at one end of the coil 111 in the radial direction.

The body 112 has an outwardly facing flange 11.
2A, the inner end face of the flange 112A is in contact with the upper surface of the bobbin 110 via the second terminal 114 for supplying electricity to the coil 111 at the other end in the radial direction of the coil 111, Hollow part 10 of bobbin 110
9 is inserted in sealing contact with the peripheral surface of the step. A concave portion 112C having an inner diameter substantially equal to the diameter of the hollow portion 109 of the bobbin 110 is formed at the distal end portion of the insertion portion 112B. The concave portion 112C of the bobbin 110 faces the other open end of the case 108. The valve body 107 for closing the open end is partially inserted into the hollow portion 109 via the wave washer 130, and is integrally formed with the solenoid body 101 by caulking at the open end of the case 108. It is fixed to.

The end face of the insertion portion 107A inserted into the hollow portion 109 of the valve body 107 and the concave portion 1 of the body 112
The plunger 102 is slidably inserted into the inner periphery of the hollow portion 109 via the sleeve 131 between the bottom surfaces of the plungers 12C, and slits 102A are formed in the outer periphery of the plunger 102 to allow fluid flow at both ends. Have been.

The valve body 107 has a through-hole 115 formed through the center axis, and a rod 103 operatively connected to the plunger 102 in the through-hole 115.
Are reciprocally inserted. In addition, concave portions 116 and 117 are provided at both ends of the through hole 115, respectively. The concave portion 116 is on the side of the insertion portion 107A inserted into the hollow portion 109, and the concave portion 117 on the opposite side has a larger diameter than the concave portion 116. The large-diameter concave portion 117 has a tapered surface 117A whose bottom portion is reduced in diameter toward the through hole 115, and the tapered surface 117A is the second valve seat 106, and the second valve seat 106 and the predetermined axial direction are fixed. An inner seat 119 having a first flow path 118 for inputting fluid pressure that opens to the opposing first valve seat 105 with an interval is fitted.

The first valve seat 105 and the second valve seat 106
In between, a ball 104 is separately inserted via a rod 103 so as to be reciprocally movable. An outer peripheral portion of the valve body 107 has a fluid pressure for controlling a mating control portion formed through in a radial direction. A control port 120 for inflow and outflow of the fluid is provided.

On the other hand, a spring 121 as a pressing means for pressing the plunger 102 against the bottom surface of the concave portion 112C of the body 112 is inserted into the concave portion 116 on the insertion portion 107A side.

A second flow path 121 is formed in the insertion portion 112B of the body 112 so as to penetrate the recess 112C.

Next, the operation of the conventional solenoid valve 100 having the above configuration will be described.

When the coil 111 of the solenoid body 101 is not energized and the coil 111 is not energized, the pressing force of the spring 121 causes the plunger 102 to
Move to the bottom side of C. By this movement, the plunger 1
The rod 103 operatively connected to 02 also moves toward the body 112, and the tip of the rod 103 is inside the through hole 115. Therefore, the ball 112 abuts on the second valve seat 106 of the valve body 107 by the fluid pressure from the first flow path 118,
The through hole 115 is closed. On the other hand, the first flow path 118 communicates with the control port 120, and the fluid pressure is output to the other control unit.

The coil 1 of the solenoid body 101
When the coil 111 is energized by being energized by the first and second terminals 113 and 114, a magnetic circuit is formed by the case 108, the body 112, the plunger 102, and the valve body 107, and the plunger 102 is moved by the spring 121.
Is magnetically attracted to the end face of the insertion portion 107A of the valve main body 107 against the pressing force. At this time, the rod 103 operatively connected to the plunger 102 protrudes from the through hole 115. Therefore, the ball 104 provided at the tip of the rod 103 is separated from the second valve seat 106 and abuts on the opposing first valve seat 105. As a result, the first flow path 118 opened to the first valve seat 105 is closed, and the control port 120 and the second flow path 121 are formed in the through hole 115, the hollow part 109 of the bobbin 110, and the outer peripheral part of the plunger 102. The communication is performed through the slit 102A, and the fluid pressure is discharged from the other control unit.

As described above, by energizing and de-energizing the coil 111, the plunger 102 is reciprocated, and the ball 104 is reciprocated via the rod 103, whereby the first valve seat 105 and the second valve seat 105 are reciprocated. The first flow path 118 and the second flow path 122 are opened / closed by being brought into contact with / separated from the 106 to control the other-side control unit.

[0016] In addition, as described above, the solenoid valve for controlling the pressure by using a ball as a valve body is the one disclosed in US Pat.
There are those described in, for example, JP-A-32889 and JP-A-5-30666.

[0017]

However, in the case of the above-mentioned prior art, since the ball 104 as the valve body is controlled by reciprocating movement, the ball 104 is used to drive the ball 104 in addition to the ball 104. The rod 103 and the plunger 102 are required, and the plunger 1
Since the components constituting the solenoid main body 101 for driving the 02 are separately provided, the number of assembly parts is large and assembly is complicated.

Further, since the plunger 102 which can be directly moved by the excitation of the coil 111 and the ball 104 which is a valve body are separate bodies, the assemblability is poor and the first ball is more sure.
There is a drawback that it is not moved to the valve seat 105 and the second valve seat 106, which is likely to cause a malfunction, and there is a problem that the control performance is not stable.

Therefore, as described in Japanese Utility Model Laid-Open No. 5-36177 (see FIG. 9), the solenoid
The plunger 201 itself driven by an electromagnetic attraction force of 0 is used as a valve body, and the first plunger 201 comes into contact with and separates from a valve seat 203 formed in a first flow path 202 provided at one end of the solenoid body 200.
There is a solenoid valve 205 that opens and closes the flow path 202 and communicates with and non-communicates with a second flow path 204 provided at the other end of the solenoid body 200.

However, this solenoid valve 20
Reference numeral 5 denotes a two-way valve which is not a three-way valve as in the above-described solenoid valve 100, but a plunger 201 which opens and closes a first flow passage 202 by bringing one valve seat 203 into and out of contact. Since the bobbin 206, the valve seat 203, and the body 207 forming the magnetic path circuit are separate from each other, there are many assembled parts and the assemblability is poor.

The present invention has been made to solve the above-mentioned problems of the prior art.
An object of the present invention is to provide a solenoid valve capable of improving assemblability and improving quality (control performance).

[0022]

In order to achieve the above object, according to the present invention, there are provided first and second valve seats provided to face each other, and a space between the first and second valve seats. A moving valve body made of a magnetic material, pressing means for pressing the valve body against one of the first and second valve seats, and the valve body being reciprocally inserted. A coil wound around a bobbin having a hollow portion, and a fixing member made of a magnetic material provided to face the valve body. A solenoid body for magnetically attracting the other valve seat of the two valve seats,
In the first, the solenoid valve for opening and closing the second flow path opening to each contact or away said valve body to said first, second valve seat by the pressing force and the magnetic attraction force of the solenoid body of the pressing means, wherein One of the first and second valve seats
And a bobbin of the solenoid body, and a magnetic path to the valve body.
The magnetic path guide member to guide
A body molded bobbin valve seat unit;
The other of the valve seats, the fixing member of the solenoid body is
Fixed member valve seat unit integrally molded with inserted resin
It is characterized by being knitted .

The bobbin valve seat unit and the fixed
It is preferable to combine the fixed member valve seat unit with the fixed member valve seat unit.
You.

[0024]

[0025]

[0026]

In the solenoid valve having the above-described structure, one of the first and second valve seats and the bobbin of the solenoid body are integrally formed of resin. Since the magnetic path guide member for guiding the magnetic path is insert molded to form a bobbin valve seat unit,
Since these components are integrated and the number of components is reduced, assemblability is improved.

Further, since the other of the first and second valve seats is formed as a fixed member valve seat unit by insert-molding the fixed member of the solenoid body, these parts are also integrated, and the number of parts is reduced. Since less is required, assemblability is further improved.

As described above, since the assembled parts are the bobbin valve seat unit and the fixed member valve seat unit, the number of parts at the time of assembly can be reduced, and the bobbin valve seat unit and the fixed member valve seat unit are connected. By doing so, the assembly is completed, so that the assemblability can be further improved.

A first valve seat and a second valve seat are provided so as to face each other, and a valve body made of a magnetic material is provided between the first valve seat and the second valve seat so as to be able to reciprocate freely. This valve element is configured to open and close the first and second flow paths which are opened and closed respectively with the first and second valve seats by the pressing force of the pressing means and the magnetic attraction force of the solenoid body. Therefore, as in the prior art, a linear motion of a plunger-rod-ball for opening and closing the first and second flow paths with a rod operatively connected to a plunger as a movable member and a ball as a separate valve body. Path is eliminated, and only the valve element needs to be directly moved, so that the cause of the malfunction can be eliminated, and the first and second paths can be eliminated.
Movement to the valve seat is ensured. As a result, control performance is stabilized.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. In FIG. 1 showing a solenoid valve according to an embodiment of the present invention, reference numeral 1 denotes an entire solenoid valve, and energizes and deenergizes a solenoid main body 3 for driving a plunger 2 as a valve body made of a magnetic material. This is a poppet type three-way valve that switches the pressure by moving the plunger 2. The solenoid valve 1 is composed of a solenoid body 3 and a valve body 4 that is integrally assembled coaxially with the solenoid body 3. And

The solenoid body 3 is provided at a case 5 having both ends open, a coil 7 wound around a hollow bobbin 6 housed in the case 5, and one open end of the case 5. A closing portion 8 for closing an open end, and a coil 7
And an annular side plate 9 as a magnetic path guide member that guides the magnetic path from the case 5 to the plunger 2. It is fixed by caulking.

The closing portion 8 and the bobbin 6 are integrally formed of resin. In this molding, the side plate 9 and the first and second terminals 10 and 11 for energizing the coil 7 are inserted. Is molded. One end of each of the first and second terminals 10 and 11 is substantially U-shaped.
A is a plate- shaped member. A hollow portion 61 into which the plunger 2 is reciprocally movable is inserted into the hollow interior of the bobbin 6.
It has become. In addition, a second valve seat 12 slightly protruding toward the hollow portion 61 on the center axis is provided at a substantially central portion in the radial direction of the closing portion 8, and the second valve seat 12 has a fluid opening on the center axis. A second flow path 13 for discharging pressure is provided.

The second valve seat 12 also forms a seal for the second flow passage 13, and the plunger 2 is provided around the second valve seat 13.
2 has a support projection 35 for supporting a load applied when the contact member 2 is in contact with the support projection 35. This support projection 3
For the specific structure of No. 5, see Japanese Utility Model Application No. 5-57404 filed by the present applicant.

In addition, the connector portion 3 which opens to the outside on the right side in FIG.
On the left side on the opposite side, there is a tapered groove 37 whose diameter increases toward the outside in the radial direction, which is opened on the inner peripheral surface of the case 5.

The closing portion 8 having the second valve seat 12 and the second flow path 13 and the bobbin 6 are integrally formed of a resin into which the side plate 9 and the first and second terminals 10 and 11 are inserted. The bobbin valve seat unit 14 is provided.

Here, the forming of the bobbin valve seat unit 14 will be described with reference to FIG.

First, the mold 15 will be described. The molding die 15 includes an upper die 16, a middle die 17, a lower die 18, a first core 19, and a second core 20. By combining these dies, the closing part 8 having the second valve seat 12 and the bobbin The cavity 21 of the bobbin valve seat unit 14 in which the 6 is integrated is formed.

The upper die 16 has a hole 16A, and a first core 19 is inserted into the inner periphery of the hole 16A in a liquid-tight manner. The surface is in contact with an end surface of a second core 20 described later.

The middle mold 17 is a split mold having a first middle mold 17A and a second middle mold 17B.
A, 17B and the second valve seat 1 continuously
2 and a bobbin cavity 21B of the bobbin 6.

The inner periphery of the bobbin cavity 21B of each of the first and second middle dies 17A and 17B has a coil projecting portion 17C for forming a portion around which the coil 7 is wound.

Each of the first and second middle dies 17A and 17B has a terminal protrusion 17D for holding a terminal on the inner periphery of the closed cavity 21A, and the first terminal 10 has a plate- like shape. The part 10B is the second medium size 17
B is held in the terminal projecting portion 17D and inserted into the closed portion cavity 21A with the substantially U-shaped portion 10A exposed. On the other hand, the second terminal 11 is shown in FIG.
As shown in (b), when matching the first and second middle dies 17A and 17B, the respective terminal protrusions 17 are provided.
D, the plate- shaped portion 11B is sandwiched and the closed portion cavity 21 is formed.
A is inserted in a state where the substantially U-shaped portion 11A is exposed in A.

After the molding, the terminal projecting portion 17D of the second middle die 17B becomes the connector portion 36 from which the plate- like portion 10B of the first terminal 10 is exposed.
In the terminal projecting portion 17D of the middle die 17A, a tapered groove 37 is formed, and the plate- like portion 11B of the second terminal 11 is exposed in the tapered groove 37 so that the tip comes into contact with the inner peripheral surface of the case 5. .

Then, the side plate 9 is inserted between the closed portion cavity 21A and the bobbin cavity 21B formed by matching the first and second middle dies 17A and 17B.

The side plate 9 is formed as shown in FIG.
As shown in (c), the annular member has an inner diameter substantially equal to the diameter of the hollow portion 61 and an outer diameter substantially equal to the inner diameter of the case 5. In order to reduce the leakage of the internal pressure of the bobbin 6 from the side plate 9 at the time of insert molding of the side plate 9 described later, a plurality of (the inner peripheral surface is evenly distributed on the inner and outer peripheral surfaces). And two slits 90 are provided on the outer peripheral surface at predetermined intervals in the circumferential direction to provide a flow path for the flowing resin flowing between the bobbin 6 and the closing portion 8.

Further, two notches 91 are provided on the outer peripheral surface for the coil 7 wound around the bobbin 6 to start the winding 71 toward the first and second terminals 10 and 11. . These notches 91 are provided in the first terminal 10
The side is formed by cutting off the lower right half in the figure, and the second terminal 11 side is formed diagonally below and to the left in the figure. Although the upper side is cut out in the figure, the shape may be an arc without cutting out. Further, the shapes and the numbers of the slits 90 and the notches 91 are not limited to those described above, but can be changed in various modes.

On the other hand, the lower die 18 has a hole 18A, and a second core 20 is inserted into the inner periphery of the hole 18A in a liquid-tight manner, and the hollow portion 61 of the bobbin 6 is inserted into the second core 20. Is formed. The second core 20 has a closed portion cavity 21A.
The end surface of the first core 19 abuts on the front end surface. This contacted part is a concave part,
The second valve seat 12 having the support projection 35 slightly protruding toward the above-described hollow portion 61 is formed in this concave portion.

The distal end of the second core 20 has a small diameter and a step 20A. The position of the step portion 20A is determined by the coil projecting portions 17 of the first and second middle dies 17A and 17B.
The second core 2 is located on the upper side of the upper side of FIG.
The end face of the side plate 9 on the side of the bobbin 6 is held in contact with the end face of the step portion 20A of the cavity 2 so that the cavity 2
Inserted in 1.

When the side plate 9 is inserted,
As shown in FIG. 5B, the pressing portion 17 protruding toward the end face side of the cut-out portion 91 for starting up the winding 71 of the side plate 9 provided in the first middle die 17A as the pressing in the rotating direction.
We go in E. The axial length of the holding portion 17E is smaller than the width of the side plate 9, and
In the figure, the resin flows up and down.

Then, the first and second middle dies 17A, 17
B is made into a middle mold 17 and this middle mold 17 and the first
The cavity 21 of the bobbin valve seat unit 14 is formed by matching the upper mold 16 to which the core 19 is attached and the lower mold 18 to which the second core 20 is attached. At this time, as described above, the side plate 9 and the first and second terminals 1
0, 11 are inserted, and in this state, the flowing resin is caused to flow through the slits 90 of the side plate 9 into the cavity 21 so that the bobbin valve seat unit 1 made of resin is formed.
4 is formed.

As described above, at the time of insert molding, a plurality of slits 90 are provided in the inner and outer peripheries of the side plate 9 as flow paths through which the flowing resin flows.
It is possible to improve the bonding strength between the upper and lower resins.
Note that the number of slits 90 and the like are not limited to those illustrated, and can be changed in various modes.

In the formed bobbin valve seat unit 14, the end face of the notch 91 (the side face of the side plate 9) for starting up the winding 71 of the coil 7 of the side plate 9 is provided as shown in FIG. As shown in ()), the resin wraps around the pressing portion 17E. Since the resin flows around in this manner, the winding 71 does not come into contact with the side surface of the side plate 9 and insulation can be reliably performed. Regarding the wraparound of the resin, it is preferable to secure a sufficient thickness between the winding 71 and the side surface of the side plate 9 for insulation even if the position of the side plate 9 in the rotation direction is slightly shifted. The amount of protrusion of the holding portion 17E may be determined according to the wall thickness.

Further, since the end surface of the side plate 9 on the bobbin 6 side is in contact with the end surface of the step portion 20A of the second core 20, the end surface on the bobbin 6 side is exposed from the resin portion.

Next, the valve body 4 will be described. The valve body 4 includes a first valve seat 22, a first flow path 23 for flowing a fluid pressure opening on the central axis into the first valve seat 22,
A passage 24 for flowing fluid pressure into and out of a counterpart control unit provided on the outer periphery of the flow path 23 is provided. The valve body 4 is formed of a resin, and at this time, a center plate 25 as a fixing member made of a magnetic material is inserted and formed.

The center plate 25 is a cylindrical member having an outward flange portion 25A that comes into contact with the inner peripheral surface of the case 5, and the outer peripheral surface of the cylindrical portion 25B is inserted along the inner peripheral surface of the bobbin 6. Things.

The first valve seat 22 of the valve body 4 is arranged on the inner periphery of the center plate 25. The first valve seat 22 is provided coaxially with the second valve seat 12 so as to face each other. The end face of the first valve seat 22 is set slightly higher than the end face of the center plate 25, and The time plunger 2 and the center plate 25 are prevented from coming into contact with each other. The first valve seat 22 is provided with a first flow path 23 that opens on the center axis.
3 is coaxial with the second flow path 13.

Further, a notch 25D through which the flow resin flows during insert molding is formed on the outer peripheral surface of the flange 25A of the center plate 25 on the coil 7 side of the flange 25A.

The passage 2 provided on the outer periphery of the first passage 23
Reference numeral 4 denotes an axial passage 24A which opens toward the hollow portion 61 of the bobbin 6 and extends in the axial direction at a predetermined radial interval on the outer peripheral portion of the first flow passage 23, and is formed all around. And a radial passage 24B extending radially outward from the rear end thereof and opening to the outside.

The plunger 2 is slidably inserted through the sleeve 26 into the hollow portion 61 of the bobbin 6 so as to be movable between the first and second valve seats 22 and 12. A slit 27 is formed in the outer peripheral portion of the plunger 2 to allow the flow of fluid on both end surfaces of the plunger 2.

On the other hand, a spring 28 as a pressing means for pressing the plunger 2 against the second valve seat 12 is provided in the axial passage 24A of the passage 24 of the valve body 4. The spring 28 is provided with one end in contact with the end face of the plunger 2 and the other end in contact with the inner end of the axial passage 24 </ b> A, and biases the plunger 2 toward the second valve seat 12. 12 is pressed.

The valve body 4 having the first valve seat 22, the first flow path 23, and the passage 24 is a fixed member valve seat unit 29 integrally formed of a resin into which the center plate 25 is inserted.

Here, the molding of the portion of the first valve seat 22 of the fixed member valve seat unit 29 will be described with reference to FIGS.
It will be described based on.

The center plate 2 is placed in the cavity 31 of the fixed member valve seat unit 29 formed by the mold 30.
Insert 5 A step 25C is provided at the distal end of the cylindrical portion 25B of the center plate 25 to protrude radially inward along the distal end surface (surface A in the drawing).

As shown in FIG. 6, the center plate 25 having the step 25C is formed into an annular passage projecting portion 32 for forming an axial passage 24A of the passage 24 of the valve body 4.
Set for type I32 with A. This type I3
2 has a hole 32B, and a core pin 33 is inserted into the inner periphery of the hole 32B in a liquid-tight manner, and the first flow path 23 is formed by the core pin 33.

The outer diameter of the root of the passage projection 32A of the mold I32 is large, and a step 32C is formed. The outer peripheral surface of the step 32C is arc-shaped (or tapered). ing. The end face with the root portion holds down the surface A of the center plate 25, and the outer peripheral surface of the root portion holds down the inner peripheral surface of the step 25C of the center plate 25.

By flowing the flowing resin into the cavity 31 with the center plate 25 inserted as described above, the inside of the cylindrical portion 25B of the center plate 25 and the inside of the flange portion 25A through the notch 25D are formed. The resin wraps around the outer end surface, and a resin-made fixed member valve seat unit 29 is formed. At this time, since the surface A of the center plate 25 and the inner peripheral surface of the step 25C are pressed at the root of the passage projection 32A of the mold I32,
The resin around the surface A can be prevented (resin burrs can be prevented),
The surface A serving as the magnetic attraction surface of the plunger 2 can be reliably exposed.

The surface A is formed so as to cover the end surface of the resin portion inside the cylindrical portion 25B to the extent that the guide of the spring 28 can be secured at the step portion 25C, and to extend the inner surface to the maximum extent. .

Further, since the outer peripheral surface is provided with a stepped portion 32C having an arc-shaped (or tapered) shape at the root portion of the passage projecting portion 32A of the mold I32, the resin burrs are not generated and the R is reduced.
The chamfer (or C) can be easily formed. This chamfer is formed to prevent the spring 28 from being caught or worn during operation. Also, the spring 28
Can be easily inserted.

As described above, the closing portion 8 having the second valve seat 12 against which the plunger 2 is pressed by the spring 28 and the bobbin 6 around which the coil 7 is wound is integrally formed of resin. Further, first and second electric currents for energizing the coil 7 are applied to the closing portion 8 during the integral molding.
Since the terminals 10 and 11 and the side plate 9 for guiding the magnetic path from the case 5 to the plunger 2 when the coil 7 is energized are insert-molded into the bobbin valve seat unit 14, these components are integrated. The number of parts is small.

Since the first valve seat 22 to which the plunger 2 comes into contact with the electromagnetic attraction of the solenoid body 3 is provided, and the center plate 25 as a fixing member is insert-molded to form the fixing member valve seat unit 29, Since these components are integrated, the number of components can be reduced.

Next, an example of assembling the solenoid valve 1 will be described with reference to FIGS. 1 and 3 (a).

First, the case 5, the formed bobbin valve seat unit 14, the fixed member valve seat unit 29, the sleeve 6, the plunger 2, and the spring 28 are prepared.

Then, the sleeve 26 and the plunger 2 are housed inside the hollow portion 61 of the bobbin 6 of the bobbin valve seat unit 14. Further, the passage 24 of the fixing member valve seat unit 29
The spring 28 is housed in the axial passage 24A.
Further, a bent portion 51 is provided by bending an open end of one end of the case 5 having both ends opened radially inward.

From the other opening of the case 5, the fixed member valve seat unit 29 containing the spring 28 is connected to the end face of the flange portion 25 A of the center plate 25 and the end face of the resin portion of the valve body 4 in which the center plate 25 is embedded. Until it contacts the end face of the bent portion 51 of the case 5.

Thereafter, the bobbin valve seat unit 14 in which the sleeve 26 and the plunger 2 are housed is placed in the case 5 by the resin in which the end face of the bobbin 6 of the bobbin valve seat unit 14 is embedded with the center plate 25 of the fixed member valve seat unit 29. Insert until it touches the end face of the part. Then, the bobbin valve seat unit 14 and the fixing member valve seat unit 29 are connected by caulking the closing portion 8 side of the bobbin valve seat unit 14 at the other open end of the case 5. Thereby, the assembly of the solenoid valve 1 is completed.

As described above, the number of parts required for assembling can be reduced, so that the assembling property can be improved. The so-called production can be facilitated. In some cases, it is not necessary to insert and mold the terminal depending on the specifications and the like.

Further, the body 112 and the valve body 107 constituting the magnetic circuit do not need to be entirely made of metal as in the prior art shown in FIG. 8, and the side plate 9 and the center plate 25 constituting the magnetic circuit are formed by insert molding. Since the bobbin valve seat unit 14 and the fixing member valve seat unit 29 are made of resin, the weight can be reduced.

The end surface of the side plate 9 of the bobbin valve seat unit 14 on the bobbin 6 side is exposed, while the bobbin 6 of the center plate 25 of the fixed member valve seat unit 29 is exposed.
Since the end face (surface A) on the hollow portion 61 side is also exposed,
When the bobbin valve seat unit 14 and the fixing member valve seat unit 29 are connected as described above, both side end surfaces of the sleeve 26 come into contact with the respective exposed portions and are fixed (FIG. 3).
(Refer to (a)), the positioning is accurately performed, and the reciprocating movement amount (movable stroke) of the plunger 2 can be accurately determined.

When the bobbin valve seat unit 14 and the fixing member valve seat unit 29 are connected as described above, a pressure leak may occur from the connecting portion and each unit may receive a load. If it is excessively large, it will adversely affect the quality of the product.

Therefore, a pressure releasing groove is provided between the bobbin valve seat unit 14 and the fixed member valve seat unit 29. In this embodiment, as shown in FIG. 4, a groove 34 for pressure release is provided on the end face of the bobbin 6. This groove 34 is formed by cutting an entire circumferential groove 34A provided on the entire periphery of the peripheral portion, a radial groove 34B penetrating in the radial direction provided at four equally spaced positions, and a full circumferential groove 34A continuous with the radial groove 34B. Two equally distributed slits 34
C.

As described above, since the pressure release groove 34 is provided, the load applied to each unit due to pressure leakage at the time of connection can be reduced. By doing so, it is not necessary to worry about the load to be received at the time of connection, so that the connection can be performed by a simple method such as press-fitting, and the wave washer 1 as in the prior art.
There is no need for 30. As a result, assembling becomes easy, and the assembling property can be improved.

The shape of the groove for depressurizing and the member for providing the groove are not limited to the above-mentioned shape and the bobbin 6, but may be provided on the end face of the valve body 4 opposed to the valve body 4 or between the end face of the bobbin 6 and the valve body 4. The same effect can be obtained even if the groove is formed in combination with the end face.

Here, the operation of the solenoid valve 1 will be described.

When power is not supplied to the coil 7 of the solenoid body 3, the plunger 2 is separated from the first valve seat 22 by the pressing force of the spring 28 and is pressed toward the second valve seat 12. Therefore, the end face of the plunger 2 is in contact with the second valve seat 12 to close the second flow path 13, and the first flow path 23 opened to the first valve seat 22 is opened. Thereby, the first flow path 23
And the passage 24 communicate with each other, and the fluid pressure is output to the counterpart control unit.

When the coil 7 of the solenoid body 3 is energized through the first and second terminals 10 and 11, the coil 7 is energized, and is energized by the case 5, the side plate 9, the plunger 2 and the center plate 25. A circuit is formed. Thereby, the plunger 2 is magnetically attracted to the center plate 25 side against the pressing force of the spring 28.
Therefore, the plunger 2 is separated from the second valve seat 12 and comes into contact with the first valve seat 22 facing the first valve seat 22.
The first flow path 23 that opens to the second valve seat 12 is closed.
The second flow path 13 opening to the opening is opened. Also, since the first valve seat 22 is located slightly higher, the passage 24 is open. From these, the passage 24 and the second flow passage 13 communicate with each other through the slit 27 of the plunger 2, and the fluid pressure from the other control unit is discharged.

As described above, only the plunger 2 (valve element) is reciprocated to bring the first valve seat 22 and the second valve seat 12 into and out of contact with each other. Is opened and closed to control the mating control unit, so that there is no longer a direct path of a plunger ← → rod ← → ball which moves a ball which is a valve element as in the prior art. Since the actuator itself can be directly moved by excitation, the cause of the malfunction can be eliminated, and the movement to the first and second valve seats 22 and 12 can be reliably performed. As a result, control performance is stabilized. That is, the quality can be improved.

The surface A of the plunger 2 of the center plate 25 of the fixing member valve seat unit 29 is
As a result, the permeance of the suction portion of the plunger 2 can be reduced, and the magnetic efficiency can be improved.

In addition, the inner peripheral surface of the side plate 9 is exposed in the hollow portion 61 in which the plunger 2 is inserted.
Since the outer peripheral surface is exposed to the case 5 and is in contact with the inner peripheral surface of the case 5, the permeance of the magnetic path can be reduced, and the magnetic efficiency can be improved.

By improving the magnetic efficiency, the size of the solenoid body 3 can be reduced.

FIG. 7 shows another embodiment of the present invention. Note that the same components as those in the above-described embodiment will be described by assigning the same reference numerals.

In the above embodiment, the solenoid valve is a normally open type solenoid valve with respect to the first valve seat 22.
A fixed member valve seat unit 29 in which the valve seat 22 side is integrally formed of resin into which the center plate 25 is inserted.
The second valve seat 12 side is formed integrally with a bobbin valve seat unit 14 made of resin into which the bobbin 6 and the side plate 9 and the first and second terminals 10 and 11 are inserted.
It is what it was.

On the other hand, in the present embodiment, the first valve seat 22
And a normally closed type solenoid valve, wherein the first valve seat 22 side is integrally formed of resin into which the bobbin 6 and the side plate 9 and the first and second terminals 10 and 11 are inserted. Seat unit 1
4, the closing part 8 having the second valve seat 12 is separate from the bobbin 6, and the closing part 8 having the second valve seat 12 is integrally formed of resin into which the center plate 25 is inserted. This is a valve seat unit 29. A spring 28 for pressing the plunger 2 against the first valve seat 22 is provided on the fixed member valve seat unit 29 side.

In the present embodiment, since other structures and operations are the same as those of the first embodiment, the same components are denoted by the same reference numerals and description thereof is omitted.

[0093]

As described above, according to the present invention,
One of the first and second valve seats and the bobbin of the solenoid main body are integrally formed of resin, and a resin for inserting a magnetic path guide member for guiding a magnetic path to the valve body at the time of the integral molding. Since the bobbin valve seat unit is integrally formed by the above, these components can be integrated and the number of components can be reduced, so that the assemblability can be improved.

Further, since the other of the first and second valve seats is a fixed member valve seat unit integrally formed of resin into which the fixing member of the solenoid body is inserted, these parts are also integrated. Thus, the number of parts can be further reduced, so that the assemblability can be further improved.

As described above, since the assembled parts are the bobbin valve seat unit and the fixed member valve seat unit, the number of parts at the time of assembly can be reduced, and the bobbin valve seat unit and the fixed member valve seat unit are connected. By doing so, the assembly is completed, so that the assemblability can be further improved.

A first valve seat and a second valve seat are provided facing each other, and a valve body made of a magnetic material is provided between the first valve seat and the second valve seat in a reciprocating manner. The first and second flow paths are opened and closed by bringing the first and second valve seats into contact with and separated from the first and second valve seats by the pressing force of the pressing means and the magnetic attraction force of the solenoid body. As described above, there is no linear motion path of a plunger-rod-ball for opening and closing the first and second flow paths with a rod operatively connected to a plunger which is a movable member and a ball as a separate valve element. Since only the valve body needs to be moved, the cause of the malfunction can be eliminated, and the movement to the first and second valve seats can be performed reliably. As a result, control performance can be stabilized.

[Brief description of the drawings]

FIG. 1A is an overall sectional view of a solenoid valve according to an embodiment of the present invention, and FIG. 1B is a sectional view of FIG.
FIG. 3C is a top view of the side plate, and FIG. 3C is a front view of FIG.

FIG. 2A is a plan view of a bobbin valve seat unit, and FIG. 2B is an enlarged sectional view taken along line AA of FIG. 2A.

FIG. 3A is an exploded sectional view of a bobbin valve seat unit, a sleeve, and a fixing member valve seat unit, and FIG.
FIG. 2 is an enlarged sectional view of a first valve seat portion in FIG.

FIG. 4A is a cross-sectional view of a bobbin valve seat unit provided with a pressure release groove, and FIG. 4B is a bottom view.

5A is a sectional view of a molding die of the bobbin valve seat unit, and FIG. 5B is an enlarged sectional view taken along line BB of FIG. 5A.

FIG. 6 is a sectional view of a molding die of a first valve seat portion of the fixed member valve seat unit.

FIG. 7 is an overall sectional view of a solenoid valve according to another embodiment of the present invention.

FIG. 8 is an overall sectional view of a conventional solenoid valve.

FIG. 9 is an overall sectional view of another conventional solenoid valve.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Solenoid valve 2 Plunger (valve element) 3 Solenoid main body 4 Valve main body 5 Case 51 Bending part 6 Bobbin 61 Hollow part 7 Coil 71 Winding 8 Closing part 9 Side plate (magnetic path guide member) 90 Slit 91 Notch part 10th 1 terminal 10A substantially U-shaped portion 10B plate-shaped portion 11 second terminal 11A substantially U-shaped portion 11B plate-shaped portion 12 second valve seat 13 second flow path 14 bobbin valve seat unit 15 molding die 16 upper die 16A hole 17 Medium 17A First Medium 17B Second Medium 17C Projection for coil 17D Projection for terminal 17E Holding part 18 Lower die 18A Hole 19 First core 20 Second core 20A Stepped portion 21 Cavity 21A Closed portion cavity 21B Bobbin cavity 22 First Valve seat 23 First passage 24 Passage 24A Axial passage 24B Radial passage 25 Center Plate (Fixed Member) 25A Flange 25B Cylindrical 25C Step 25D Notch 26 Sleeve 27 Slit 28 Spring (Pressing Means) 29 Fixed Member Valve Seat Unit 30 Mold 31 Cavity 32 Mold I 32A Protrusion for Passage 32B Hole 32C Step portion 33 Core pin 34 Depressurizing groove 34A Full circumferential groove 34B Radial groove 34C Slit 35 Support protrusion 36 Connector part 37 Tapered groove

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 54-182419 (JP, U) JP-A 58-89669 (JP, U) JP-A 3-43183 (JP, U) JP-A 5- 69471 (JP, U) Japanese Utility Model Showa 64-41779 (JP, U) Japanese Utility Model Showa 62-128286 (JP, U) Japanese Utility Model Showa 60-173773 (JP, U) Japanese Utility Model Utility Model No. 3-29657 (JP, Y2) (58) Field surveyed (Int.Cl. ⁷ , DB name) F16K 31/06-31/11

Claims (2)

(57) [Claims] A first valve seat and a second valve seat provided to face each other; a valve body made of a magnetic material moving between the first valve seat and the second valve seat; A pressing means for pressing against one of the two valve seats; a coil wound around a bobbin having a hollow portion into which the valve body is reciprocally inserted; and a coil provided facing the valve body. And a magnetic body for magnetically attracting the valve body against the other of the first and second valve seats against the pressing force of the pressing means. And opening and closing the first and second flow paths which are respectively opened and closed by bringing the valve body into and out of contact with the first and second valve seats by the pressing force of the pressing means and the magnetic attraction force of the solenoid body. In the solenoid valve, one of the first and second valve seats is connected to the solenoid.
A magnetic path guide for guiding the magnetic path to the valve body with the bobbin of the main body
Integrally formed bobbin valve made of resin with inserted members
The other of the first and second valve seats is the solenoid valve.
Integrated with resin with fixing member of
Solenoid valve characterized in that it is a fixed member valve seat unit of a shape . 2. The bobbin valve seat unit and the fixed member valve.
2. The seat unit according to claim 1, wherein the seat unit is connected to the seat unit.
2. The solenoid valve according to item 1.