JPH07260031A - Solenoid valve - Google Patents

Abstract

PURPOSE:To facilitate assembling work of a collar by providing a large diameter part on the base end of a sleeve through an annular engaging stepped part, fixing the collar on the housing main body in a state where it is fitted into an insertion hole, and interposing an annular seal member between the inner surface of the insertion hole and the outer surface of the large diameter part. CONSTITUTION:A large diameter part 29b is provided on the base end of a sleeve 29 in a valve operating unit 11c through an annular engaging stepped part 29a. A collar 28 to be engaged with the engaging stepped part 29a is caulked and connected to a housing main body 27 in a state where the large diameter part 29b is fitted into an insertion hole 32 of the housing main body 27, and an annular seal member 60 is inserted between the inner surface of the insertion hole 32 and the outer surface of the large diameter part 29b. Therefore, pressing force of the collar 28 does not act on the seal member 60, and seal pressure by the seal member 60 depends on only the filing volume of the seal member 60. Accordingly, the collar 28 exhibits only anti-slip fixing function of the sleeve 29.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a housing having a valve seat having a valve hole opened in the center thereof, and an insertion hole coaxial with the valve hole provided in the housing. The base end of the sleeve is inserted into the insertion hole, and an annular collar engaged with the base end of the sleeve on the side that prevents the sleeve from coming out of the housing main body is fixed to the housing main body. The present invention relates to an electromagnetic valve in which an annular seal member is interposed between a main body and a housing, and a movable core that operates integrally with a valve body that can be seated on the valve seat is slidably fitted to a sleeve.

[0002]

2. Description of the Related Art Conventionally, such a solenoid valve is already known from, for example, Japanese Utility Model Publication 58-17178.

[0003]

In the above-mentioned conventional solenoid valve, when fixing the base end of the sleeve to the housing main body, a flange is provided at the base end of the sleeve, and the collar abutting against the flange is mainly attached to the housing. Screwed together,
An O-ring is sandwiched between the housing main body and the flange. Therefore, the O-ring is pressed between the flange and the housing main body to exert a sealing function, and the sealing pressure is affected by the tightening force of the collar, that is, the pressing force. The work must be strictly managed, and the assembly work is troublesome. Moreover, if the collar is loosely attached, the sealing function of the sealing member may be incomplete.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a solenoid valve which facilitates the work of assembling the collar and at the same time allows the sealing member to always exhibit a sufficient sealing function. To do.

[0005]

In order to achieve the above object, according to the present invention, a housing main body having a valve seat having a valve hole opened at a central portion is provided with an insertion hole coaxial with the valve hole. A base of a bottomed cylindrical sleeve having a closed tip is inserted into the insertion hole, and an annular collar engaged with the base of the sleeve on the side that prevents the sleeve from coming out of the housing main body. The movable core is fixed to the housing main body, and an annular seal member is interposed between the base end portion of the sleeve and the housing main body, and the movable core that operates integrally with the valve body that can be seated on the valve seat is slidable on the sleeve. In the fitted solenoid valve, a large diameter portion is provided at the base end portion of the sleeve through an annular engagement step portion, and a collar engaging with the engagement step portion inserts the large diameter portion. It is fixed to the housing body while it is fitted in the hole. Characterized in that the annular seal member is interposed between the outer surfaces of the inner surface and the large diameter portion of the insertion hole.

[0006]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 show a first embodiment of the present invention. FIG. 1 is a vertical sectional view of a normally closed solenoid valve, FIG. 2 is a sectional view taken along line 2-2 of FIG. 1, and FIG. Is a sectional view taken along line 3-3 of FIG.
FIG. 4 is a perspective view of the magnetic path frame.

First, in FIG. 1, the normally closed solenoid valve V _C is
Solenoid unit 10 and the solenoid unit 10
And a valve actuation unit 11 _C that is actuated by the electromagnetic force.

The solenoid unit 10 includes a coil assembly 12 and a magnetic path frame 13 mounted on the coil assembly 12, and the coil assembly 12 includes a bobbin 14 made of synthetic resin and the bobbin. A coil 15 wound around 14 is covered with a mold part 16 made of synthetic resin.

Referring to FIGS. 2 and 3 together, the bobbin 14 includes a cylindrical portion 14a, a first flange portion 14b extending radially outward at one axial end of the cylindrical portion 14a, and a first flange portion 14b. A second flange portion 14c protruding radially outward from the cylindrical portion 14a at a position spaced apart from the flange portion 14b in the other axial direction, and a second flange portion 1 at the other end of the cylindrical portion 14a.
4c and the lead wire holding | maintenance part 14d continuously provided.

The coil 15 is wound around the cylindrical portion 14a between the first and second flange portions 14b and 14c of the bobbin 14.

The bobbin 1 is mounted on the coil assembly 12 in which the bobbin 14 and the coil 15 are covered with the mold portion 16.
4 is provided with a center hole 17 that makes the best use of the inner surface of the cylindrical portion 14a of the bobbin 14, and the inner end of the bobbin 14 is located at the inner end on the axially outer side of the one flange portion 14c.
A fitting groove 18 is formed along the radial direction of the center hole 17 so that the fitting groove 18 is exposed to the outside and the outer end is opened to the outer surface of the coil assembly 12. Thus, the bobbin 14 has a mold portion 16
Before the covering by, a slit which becomes a part of the fitting groove 18 is provided in advance.

In the lead wire holding portion 14d of the bobbin 14, a pair of connection terminals 19 and 20 connected to both ends of the coil 15 are provided on the side opposite to the outer end opening 18a of the fitting groove 18 with respect to the axis of the center hole 17. Are fixed, and one ends of the lead wires 21 and 22 are connected to the connection terminals 19 and 20 by soldering or the like. Moreover, both lead wires 21,
Reference numeral 22 denotes a part of the lead wire holding portion 14d that is held in the lead wire holding portion 14d and is led to the outer end opening 18a side of the fitting groove 18. The closed portion is embedded in the mold portion 16.

Referring also to FIG. 4, the magnetic path frame 13 contacts the first flat plate portion 1 which abuts and engages with one end of the coil assembly 12.
3a, the second flat plate portion 13b fitted in the fitting groove 18 of the coil assembly 12, and the first and second flat plate portions 13a, 13
It has a connecting plate portion 13c for connecting b, is formed in a substantially "U" shape by magnetic metal, and is attached to the coil assembly 12 so that an attachment operation along the radial direction of the center hole 17 is possible.

The first flat plate portion 13a is formed in a disk shape corresponding to the shape of one end of the coil assembly 12, and has a penetrating hole which is aligned with the central hole 17 of the coil assembly 12 at the center thereof. The hole 23 is provided in a circular shape having the same diameter as the central hole 17. A through hole 24 aligned with the central hole 17 of the coil assembly 12 is formed at the tip of the second flat plate portion 13b in an arc shape which is flush with the inner peripheral surface of the central hole 17 over a range of 180 degrees or more. Is provided.

Referring again to FIG. 1, the valve actuation unit 11 _C
Is a valve housing 26 including a sleeve 29, a fixed core 46 fixed in the sleeve 29, a movable core 49 _C housed in the sleeve 29 by being biased by a spring in a direction away from the fixed core 46, and a valve. The movable core 4 can be seated on the valve seat 43 _C fixedly provided on the housing 26.
And a valve body 51 fixed to 9 _C.

The valve housing 26 is non-magnetic between a housing main body 27 formed of a magnetic metal in a stepped cylindrical shape and a collar 28 formed of a magnetic metal in an annular shape and caulked to the housing main body 27. The base end portion of a sleeve 29, which is formed into a thin-walled cylindrical shape having a closed end with a material such as stainless steel, is liquid-tightly held.

In the housing main body 27, a fitting hole 30 having one end opened in order from the solenoid unit 10 side,
An insertion hole 32 having a diameter smaller than that of the fitting hole 30 and one end of which is connected to the other end of the fitting hole 30 via a step portion 31, and a stepped receiving portion 33 facing the insertion hole 32 side. Through one end of the insertion hole 32 and the diameter of the tapered hole 34 becomes smaller as the distance from the receiving portion 33 increases, and the diameter of the tapered hole 34 is smaller than that of the other end (small diameter end) of the tapered hole 34. Press-fit hole 36 with one end connected to the other end of the tapered hole 34
And a passage hole 38 having a diameter smaller than that of the press-fitting hole 36 and having one end connected to the other end of the press-fitting hole 36 via a step portion 37, and a stepper 39 having a diameter larger than that of the passage hole 38. Through passage hole 38
And a mounting hole 40 having one end connected to the other end and the other end opened.

A cylindrical valve seat member 41 _C is fixed to the housing main body 27 by press-fitting it into the press-fitting hole 36 until the base end of the valve seat member 41 _C abuts against the step portion 37, and the valve seat member protruding from the press-fitting hole 36. The passage hole 38 is provided at the center of the tip of the member 41 _C.
A tapered valve seat 43 _C having a valve hole 42 c communicating with the center is opened at the center. The mounting hole 40 has a passage hole 3
Filter 4 for filtering the working fluid flowing toward the 8 side
4 is attached.

A large diameter portion 29b is provided at a base end portion of the sleeve 29 via an annular engaging step portion 29a which extends outward in the radial direction. The large diameter portion 29b is inserted into the insertion hole 32. It is formed in a cylindrical shape having a possible outer diameter, and also has a large diameter portion 2.
The axial length of 9b is the engagement step portion 29 when the tip of the large diameter portion 29b is brought into contact with the receiving portion 33 of the housing main body 27.
It is set so that a is located at a position corresponding to the axially intermediate portion of the fitting hole 30.

On the other hand, the collar 28 is formed in an annular shape having at one end an engaging collar portion 28a that extends radially inward and engages with the engaging step portion 29a of the sleeve 29, and at the same time, the housing main body 27 is formed. It is fitted in the fitting hole 30,
The axial length is set corresponding to the axial length of the fitting hole 30 in the housing main body 27. Moreover, an annular locking portion 28b is provided on the outer circumference of one end of the collar 28.

Thus, the inner periphery of the outer end portion of the fitting hole 30 of the housing main body 27 is caulked inward in the radial direction, and the caulking portion 45 is engaged with the annular locking portion 28b, so that the sleeve 29 is secured. The base end is fixed to the housing main body 27. Moreover, the insertion hole 3 in the housing main body 27
An annular seal member 60 such as an O-ring that elastically contacts the outer peripheral surface of the large diameter portion 29b of the sleeve 29 is mounted on the inner surface of the sleeve 2.

A closed end 29c of the sleeve 29 is formed in a hemispherical shape, and a fixed core 46 made of magnetic metal is fitted and fixed in the sleeve 29 on the closed end 29c side. That is, the fixed core 46 is provided with a spherical contact surface 47 that contacts the inner surface of the closed end 29c of the sleeve 29 on one end side, and an annular locking groove 48 on the outer peripheral surface that contacts the inner peripheral surface of the sleeve 29. The sleeve 29 is provided until the contact surface 47 contacts the inner surface of the closed end 29c.
With the fixed core 46 fitted therein, the sleeve 29 is caulked inward at the portion corresponding to the locking groove 48, and the locking groove 4 is inserted.
The engagement of the fixed core 46 with the sleeve 29
Fixed inside.

Movable core 49_CFaces the fixed core 46
Is slidably fitted in the sleeve 29,
Body 27 and movable core 49_CIn the sleeve 29 between
Valve seat member 41_CValve chamber 50 with the tip of the valve facing_CFormed
Be done. Therefore, the movable core 49_CValve chamber 50_CIn the end facing the
At the center, the valve seat member 41_CValve seat 43_CSpherical that can be seated on
The valve body 51 of is fixed. Also fixed in the sleeve 29
Core 46 and movable core 49_CBetween the movable core 49_C
In the direction of moving away from the fixed core 46, that is, the valve body 51
Valve seat 43_CReturn that exerts a spring force in the direction to be seated on
Spring 52_CThe movable core 49_CMultiple outer surfaces
The flow groove 53 that allows the working fluid to flow._C… Is the axial direction
Drilled over the entire length. Furthermore, the fixed core 46 can move.
Core 49 _CAt the side end, the movable core 49_CFixed core 4
6 made of non-magnetic material to avoid direct contact with
The spacer 54 is attached.

An annular recess 5 is formed on the outer periphery of the housing main body 27.
5 is provided, and the annular recess 55 is provided in the housing main body 27.
It is communicated with the valve chamber 50 _C via a communication passage 56 formed in the valve chamber. An annular filter 57 is attached to the outer periphery of the housing main body 27 so as to cover the annular recess 55. Thus, the housing main body 27 is fitted to a support body (not shown) with the filter 57 attached, and the filter 5
O-rings 58 and 59 which are elastically contacted with the inner circumference of the above-mentioned support are mounted on the outer circumference of the housing main body 27 on both sides of 7.

[0026] Such valve operating unit 11 _C, so as to fit the sleeve 29 out of the parts constituting the valve actuation unit 11 _C in the center hole 17, the solenoid unit 10 is assembled, it A normally closed solenoid valve V _C is constituted by

Moreover, the housing main body 27 and the collar 28 of the valve actuating unit 11 _C are brought into contact with the first flat plate portion 13 a of the magnetic path frame 13 of the solenoid unit 10 in the assembled state to the solenoid unit 10. Also the valve operating unit 11 _C of the center hole 17 at the opposite end is provided with a spherical receiving portion 17a, the center hole 17
The closed end 29c of the sleeve 29 that is fitted in is received by the receiving portion 17a.

The operation of the first embodiment will now be described. In the demagnetized state of the coil 15, the movable core 49 _C is moved to the side away from the fixed core 46 by the spring force of the return spring 52 _C , and the movable core 49 _C is movable. The valve element 51 that operates integrally with the core 49 _C is seated on the valve seat 43 _C to close the valve hole 42 _C. When the coil 15 is excited, a magnetic path from the fixed core 46 to the fixed core 46 via the sleeve 19, the magnetic path frame 13 and the movable core 49 _C is generated, and the movable core 45 _C is attracted to the fixed core 46 side. it allows the valve element 51 is to open the valve hole 42 _C and away from the valve seat 43 _C. Therefore, the hydraulic fluid that has passed through the filter 57 and flowed into the annular recess 55 flows out of the filter 44 through the communication passage 56, the valve chamber 50 _C , the valve hole 42 _C and the passage hole 38.

In such a normally closed solenoid valve V _C , in the solenoid unit 10, the coil assembly 12 is disposed on the axially outer side of the second flange portion 14 c of the bobbin 14.
A fitting groove 18 having an inner end facing the center hole 17 and an outer end opened to the outer surface of the coil assembly 12 has a center hole 17
The magnetic path frame 13 is provided along the radial direction of
The flat plate portion 13b is fitted into the fitting groove 18 and mounted on the coil assembly 12. Moreover, the second flat plate portion 13b of the magnetic path frame 13 is provided with a through hole 24 having an inner peripheral surface that is flush with a part of the inner peripheral surface of the center hole 17, and the first flat plate portion of the magnetic path frame 13 is provided. A through hole 23 is provided on the inner peripheral surface of the center hole 17 on the inner circumference 13a so as to be flush with the entire circumference. Therefore, the sleeve 29 fitted in the bobbin 14 has a first
The second flat plate portions 13a and 13b can be brought into contact with each other, and the fixed core 46 in the sleeve 29 is attached to the magnetic path frame 13.
Can be made as close to each other as possible, thereby reducing the magnetic path resistance and increasing the magnetic attraction force, and the solenoid unit 10 can be miniaturized.

The normally closed solenoid valve V _C is constructed by assembling the valve operating unit 11 _C and the solenoid unit 10 so that the sleeve 29 of the valve operating unit 11 _C is fitted in the center hole 17. Since the solenoid unit 10 can be downsized by increasing the magnetic attraction force as described above, it is possible to apply a relatively large driving force to the valve actuation unit 11 _C , and the normally closed solenoid valve is provided. It is possible to reduce the size of V _C.

Further, in the solenoid unit 10, one end of the solenoid unit 10 is connected to the axis of the center hole 17 on the side opposite to the outer end opening 18a of the fitting groove 18 via the connection terminals 19 and 20 and the coil 1 is provided.
The lead wires 21, 22 connected to 5 are led out to the outer end opening 18a side of the fitting groove 18 on the outer side of the fitting groove 18 along the axial direction of the center hole 17, and the lead wires 21 thereof are provided. , 22
Are embedded in the mold part 16. Therefore, the length of the portion of the lead wires 21 and 22 embedded in the mold portion 16 is set to be relatively large as compared with the lead wires 21 and 22 which are led out to the outer side in the axial direction of the coil assembly 21. The effective length of the seal can be made relatively large and the sealability can be improved.

[0032] Moreover the base end portion of the sleeve 29 in the valve operating unit 11 _C, and the large-diameter portion 29b is provided through the annular engagement step 29a, the large diameter portion insertion hole 32 of the housing main 27 In the state in which 29b is fitted, the collar 28 that engages with the engagement step portion 29a is caulked and coupled to the housing main body 27, and an annular seal member is provided between the inner surface of the insertion hole 32 and the outer surface of the large diameter portion 29b. 60 is interposed. Therefore, the pressing force of the collar 28 does not act on the seal member 60, and the seal pressure by the seal member 60 depends only on the filling volume of the seal material 60 between the outer surface of the large diameter portion 29b and the inner surface of the insertion hole 32. It will be. Therefore, the collar 28 only needs to exhibit the retaining / fixing function of the sleeve 29, and even if the collar 28 is loose in the axial direction, the sealing function of the seal member 60 is not adversely affected. It is not necessary to strictly control the assembling work of 29, and the assembling work can be facilitated.

FIG. 5 shows a second embodiment of the present invention, in which parts corresponding to those in the first embodiment are designated by the same reference numerals.

This normally open solenoid valve V _O is composed of a solenoid unit 10 and a valve actuation unit 11 _O which is actuated by the electromagnetic force of the solenoid unit 10.
The valve actuation unit 11 _O is spring-biased in a direction in which the valve housing 26 including the sleeve 29, the valve seat member 41 _O that also serves as a fixed core and is fixed to the valve housing 26, and the valve seat member 41 _{O are} separated from each other. A movable core 49 _O housed in the sleeve 29 and a valve body 51 fixed to the movable core 49 _O so as to be able to be seated on the valve seat 43 _O provided on the valve seat member 41 _O.

In the housing main body 27 of the valve housing 26, a cylindrical valve seat member 41 _O has its base end at the step portion 3.
7 is fixed by press-fitting into the press-fitting hole 36 until it comes into contact with 7, and a valve hole 42 _O communicating with the passage hole 38 is opened in the central part at the center part of the tip of the valve seat member 41 _O projecting from the press-fitting hole 36. A tapered valve seat 43 _C is provided.

A movable core 49 _O facing the valve seat member 41 _O which also serves as a fixed core is slidably fitted in the sleeve 29, and the sleeve 29 is provided between the housing main body 27 and the movable core 49 _O. , the valve chamber 50 _O which is faced the tip of the valve seat member 41 _O are formed. A spherical valve element 51 that can be seated on the valve seat 43 _O of the valve seat member 41 _O is fixed to the center of the end of the movable core 49 _O facing the valve chamber 50 _O. Further, between the step portion 35 of the housing main body 27 and the movable core 49 _O , a spring force is exerted in a direction of separating the movable core 49 _O from the valve seat member 41 _O , that is, in a direction of separating the valve body 51 from the valve seat 43 _O. The return springs 52 _O are contracted, and the plurality of outer surfaces of the movable core 49 _O are provided with circulation grooves 53 _O ...

In this normally open solenoid valve V _O , when the coil 15 is demagnetized, the movable core 49 _O is moved to the side away from the valve seat member 41 _O by the spring force of the return spring 52 _O. The valve element 51 operating integrally with the movable core 49 _C is separated from the valve seat 43 _O to open the valve hole 42 _O.
Therefore, the hydraulic fluid passing through the filter 44 and flowing into the passage hole 38 flows out of the filter 57 through the valve hole 42 _O , the valve chamber 50 _O , the communication passage 56 and the annular recess 55. When the coil 15 is excited, the valve seat member 4
1 _O to housing main body 27, magnetic path frame 13, sleeve 1
9 and the movable core 49 _O to the valve seat member 41 _O , a magnetic path is generated, and the movable core 49 _O is attracted to the valve seat member 41 _O side, whereby the valve body 51 is seated on the valve seat 43 _O. The valve hole 42 _O is closed.

In the second embodiment, the construction of the solenoid unit 10 is the same as that of the first embodiment, and the fixing structure of the sleeve 29 in the valve operating unit 11 _O is the same as that of the first embodiment. The same effect as the first embodiment can be obtained.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the claims. It is possible to do.

For example, the collar 28 is used as the housing main body 2.
It may be screwed and fixed to 7.

[0041]

As described above, according to the present invention, the base end portion of the sleeve is provided with the large diameter portion through the annular engaging step portion, and the collar engaging with the engaging step portion is provided. , Fixed to the housing main body with the large diameter portion fitted in the insertion hole,
Since the annular sealing member is provided between the inner surface of the insertion hole and the outer surface of the large diameter portion, the pressing force of the collar does not act on the sealing member, and the sealing pressure by the sealing member is equal to that of the outer surface of the large diameter portion. By only relying on the filling volume of the seal member between the inner surfaces of the insertion holes, the assembly work can be facilitated without the need for strict control of the sleeve assembly work, and even if the collar has some axial deviation. The sealing member can be made to exhibit a sufficient sealing function.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a normally closed solenoid valve according to a first embodiment.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

3 is a sectional view taken along line 3-3 of FIG.

FIG. 4 is a perspective view of a magnetic path frame.

FIG. 5 is a vertical sectional view of a normally open solenoid valve according to a second embodiment.

[Explanation of symbols]

27 ... housing main 28 ... collar 29 ... sleeve 29a ... engagement step 29 b ... large-diameter portion 32 ... insertion hole 42 _C, 42 _O ... valve hole 43 _C, 43 _O ... Valve seat 49 _C , 49 _O ... Movable core 51 ... Valve body 60 ... Seal member V _C ... Normally closed solenoid valve V _O ... Normally open solenoid valve

Claims (1)

[Claims] To 1. A valve hole (42 _C, 42 _O) a valve seat is opened in the central portion (43 _C, 43 _O) housing main with (27), the valve and the hole (42 _C, 42 _O) A coaxial insertion hole (32) is provided, and a base end portion of a bottomed cylindrical sleeve (29) having a closed distal end is inserted into the insertion hole (32), and a housing main body (27) of the sleeve (29) is provided. )
An annular collar (28), which is engaged with the proximal end of the sleeve (29) on the side that prevents it from coming off, is fixed to the housing main body (27), and the proximal end of the sleeve (29) and the housing main body (27). An annular seal member (6
0) is interposed, and the movable core (4) operates integrally with the valve body (51) which can be seated on the valve seat (43 _C , 43 _O ).
In the solenoid valve in which 9 _C , 49 _O ) is slidably fitted in the sleeve (29), the base end of the sleeve (29) is
A large diameter portion (29b) is provided via an annular engagement step (29a), and a collar (28) engaging with the engagement step (29a) inserts the large diameter portion (29b) into the insertion hole. (32)
It is fixed to the housing main body (27) in a state of being fitted to, and an annular seal member (60) is provided between the inner surface of the insertion hole (32) and the outer surface of the large diameter portion (29b). Solenoid valve.