JPH07260029A - Solenoid valve - Google Patents

Abstract

PURPOSE:To decrease work manhours by providing a spherical contact surface matching to a tip blocking part inner surface of a sleeve on a fixed cord, providing an annular locking stepped part facing the tip blocking part, and caulking and engaging an intermediate part of the sleeve to/with the locking stepped part of the fixed core. CONSTITUTION:A large diameter part 29b is provided on the base end of a sleeve 29 in a valve operating unit 11 through an annular engaging stepped part 29a, and 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. Moreover, when a fixed core 46 is fixed on the tip blocking part 29c side in the sleeve 29, the sleeve 29 is caulked inwardly and engaged with a locking stepped part 48 in a state where the fixed core 46 is fitted into the sleeve 29 until a contact surface 47 is brought in contact with the inner surface of the tip blocking part 29c. Thereby, any cutting work after casting forming is not necessitated, and any cutting chip is not generated, thereby the work is facilitated, and work manhours can be decreased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a housing main body having a valve seat having a valve hole opened in the center thereof, and a base end portion of a cylindrical sleeve having a bottom whose end closing portion is substantially hemispherical. Is
The intermediate portion of the sleeve is caulkedly engaged with the fixed core fitted to the tip closing portion side in the sleeve, and the valve is attached to the movable core that is slidably fitted into the sleeve facing the fixed core. The present invention relates to an electromagnetic valve in which a seatable valve element is provided, and a solenoid unit for exerting an electromagnetic force that attracts a movable core to a fixed core side is arranged surrounding 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 the fixed core is fixed to the tip closed portion side in the sleeve, an annular locking groove is provided on the outer periphery of the fixed core. By applying a pressing force to the intermediate portion of the sleeve inward in the radial direction at the portion corresponding to, the caulking portion is engaged with the locking groove. However,
The annular locking groove is formed by subjecting the outer periphery of the fixed core to a cutting process after the forging, and the process is troublesome, and it is necessary to reliably wash and remove the cutting waste after the cutting process. Yes, the processing man-hour increases.

The present invention has been made in view of the above circumstances, and when fixing the fixed core to the tip closed portion side in the sleeve, it is possible to reduce the number of processing steps by eliminating troublesome processing, and to fix the fixed core to the sleeve. An object of the present invention is to provide a solenoid valve capable of surely preventing tilting with respect to an axis.

[0005]

In order to achieve the above object, the present invention relates to a bottomed cylinder having a substantially hemispherical tip closing portion in a housing main body having a valve seat with a valve hole opened in the central portion. -Shaped sleeves are connected in series at their base ends, and the intermediate portion of the sleeve is caulkedly engaged with the fixed core that is fitted into the distal end closed portion side of the sleeve, and can slide inside the sleeve facing the fixed core. A valve element that can be seated on the valve seat is provided in the movable core fitted to the solenoid, and a solenoid unit for exerting an electromagnetic force that attracts the movable core to the fixed core side is disposed surrounding the sleeve. In the solenoid valve according to the first aspect of the invention, the fixed core is provided with a spherical contact surface that is aligned with the inner surface of the tip closing portion of the sleeve, and has an annular locking step portion that faces the side opposite to the tip closing portion. The abutment surface is provided on the inner surface of the sleeve tip closing part. Said engaging step portion of the fixed core are in a state of being contact, the intermediate portion of the sleeve is characterized in that the engaged caulking engagement.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

1 to 5 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a solenoid valve, and FIG.
2 is a sectional view taken along line -2, FIG. 3 is a sectional view taken along line 3-3 in FIG. 1, FIG. 4 is a perspective view of a magnetic path frame, and FIG. 5 is a sectional view showing a time when a fixed core is fixed to a sleeve.

First, in FIG. 1, the solenoid valve V is of a normally closed type, and includes a solenoid unit 10 and a valve operating unit 11 which is operated by the electromagnetic force of the solenoid unit 10.
Composed of and.

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
Is a valve housing 26 including a sleeve 29, a fixed core 46 fixed in the sleeve 29, a movable core 49 spring-biased in a direction away from the fixed core 46 and housed in the sleeve 29, and a valve housing. 26, and a valve element 51 fixed to a movable core 49 so that it can be seated on a valve seat 43 fixedly provided.

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.

In the housing main body 27, the press-fitting hole 3 is provided until the cylindrical valve seat member 41 abuts its base end on the step portion 37.
6, the valve seat member 41 is fixed by being press-fitted into the valve 6, and protrudes from the press-fitting hole 36. At a central portion of the tip of the valve seat member 41, a tapered valve seat 43 having a valve hole 42 communicating with the passage hole 38 is opened at the central portion.
Is provided. Further, a filter 44 for filtering the working fluid flowing toward the passage hole 38 side is mounted in the mounting hole 40.

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 tip closing portion 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 tip closing portion 29c side. That is, the fixed core 46 is provided with a spherical contact surface 47 which is aligned with the inner surface of the distal end blocking portion 29c of the sleeve 29 on one end side, and has an annular engagement facing the side opposite to the distal end blocking portion 29c. A stop 48 is provided. Then, as shown in FIG. 5, the fixed core 46 to which the pressing force is applied from the pressing jig 70 along the axial direction is sleeved until the contact surface 47 contacts the inner surface of the tip closing portion 29c. 29. In this state, the fixed core 46 is fixed in the sleeve 29 by caulking the sleeve 29 inward at the portion corresponding to the locking step portion 48 and engaging with the locking step portion 48. To be done.

The movable core 49 is slidably fitted in the sleeve 29 so as to face the fixed core 46, and the tip of the valve seat member 41 is provided in the sleeve 29 between the housing main body 27 and the movable core 49. The exposed valve chamber 50 is formed. A spherical valve element 51 that can be seated on the valve seat 43 of the valve seat member 41 is fixed to the center of the end of the movable core 49 facing the valve chamber 50. Further, in the sleeve 29, between the fixed core 46 and the movable core 49, a return spring 52 that exerts a spring force in a direction of separating the movable core 49 from the fixed core 46, that is, a direction of seating the valve body 51 on the valve seat 43. The movable core 49 is provided with a plurality of flow grooves 53 .... Further, the movable core 49 is attached to the end of the fixed core 46 on the movable core 49 side.
A spacer 54 made of a non-magnetic material is attached to avoid direct contact with the fixed core 46.

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 via a communication passage 56 formed in the. 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.

The solenoid unit 10 is attached to the valve operating unit 11 so that the sleeve 29 is fitted into the center hole 17, and the solenoid valve V is constituted by the solenoid unit 10.

Moreover, the housing main body 2 in the valve actuating unit 11 in the assembled state to the solenoid unit 10
7 and the collar 28 are brought into contact with the first flat plate portion 13a of the magnetic path frame 13 of the solenoid unit 10. Further, a spherical receiving portion 17a is provided at an end of the central hole 17 on the opposite side to the valve operating unit 11, and the distal end blocking portion 29c of the sleeve 29 fitted in the central hole 17 is the receiving portion 17a. Can be received at.

The operation of this embodiment will now be described. In the demagnetized state of the coil 15, the movable core 49 is moved to the side away from the fixed core 46 by the spring force of the return spring 52, and is integrated with the movable core 49. The valve element 51 that operates in accordance with the above is seated on the valve seat 43 and the valve hole 42 is closed. When the coil 15 is excited, the fixed core 46 moves to the sleeve 1
9, the magnetic path frame 13 and the movable core 49, and then the fixed core 46.
And the movable core 45 is attracted to the fixed core 46 side, the valve body 51 separates from the valve seat 43 and opens the valve hole 42. Therefore, the hydraulic fluid that has passed through the filter 57 and flowed into the annular concave portion 55 is
6, through the valve chamber 50, the valve hole 42, and the passage hole 38, and flows out from the filter 44.

In such a solenoid valve V, in the solenoid unit 10, the second flange portion 14c of the bobbin 14 is used.
On the axially outer side of the coil assembly 12, a fitting groove 18 having an inner end facing the center hole 17 and an outer end opened to an outer surface of the coil assembly 12 has a radius of the center hole 17. The magnetic path frame 13 is provided along the direction of the second flat plate portion 1
Coil assembly 1 by fitting 3b into fitting groove 18
It is attached to 2. 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 central hole 17, and the first flat plate portion 13a of the magnetic path frame 13 has an inner peripheral surface of the central hole 17. The through hole 23 is provided so as to be flush with the entire circumference thereof. Therefore,
The first and second flat plate portions 13a, 13b can be brought into contact with the sleeve 29 fitted in the bobbin 14, and the magnetic path frame 13 can be brought as close as possible to the fixed core 46 in the sleeve 29. Thus, the magnetic path resistance can be reduced to increase the magnetic attraction force, and the solenoid unit 10 can be downsized.

The solenoid valve V is constructed by assembling the valve operating unit 11 and the solenoid unit 10 so that the sleeve 29 of the valve operating unit 11 is fitted in the center hole 17, and the solenoid unit 10 is connected to the solenoid valve 10. ,
Since the magnetic attraction force can be increased to reduce the size as described above, a relatively large driving force can be applied to the valve actuation unit 11, and the electromagnetic valve V can be reduced in size.

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.

Moreover, a large diameter portion 29b is provided at the base end portion of the sleeve 29 in the valve operating unit 11 via an annular engagement step portion 29a, and the large diameter portion 29b is inserted into the insertion hole 32 of the housing main body 27. Is fitted, the collar 28 that engages with the engagement step portion 29a has the housing main body 2
An annular seal member 60 is interposed between the inner surface of the insertion hole 32 and the outer surface of the large diameter portion 29b. 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.

Further, the tip closing portion 29 in the sleeve 29 is provided.
When fixing the fixed core 46 to the c side, the contact surface 47
Since the sleeve 29 is caulked inward with the fixed core 46 fitted into the sleeve 29 until it comes into contact with the inner surface of the tip closing portion 29c, the sleeve 29 is engaged with the locking step portion 48. An annular locking step portion 48 facing the opposite end side from 47 can be formed during forging of the fixed core 46, and unlike the conventional one having an annular locking groove, cutting after forging molding. Since machining is unnecessary and no cutting chips are generated due to the machining, machining is simple and the number of machining steps can be reduced. In addition, the sleeve 29 is crimped and the locking step portion 4 is formed.
8, the contact surface 47 provided on one end side of the fixed core 46 is aligned with the inner surface of the distal end blocking portion 29c of the sleeve 29, so that the pressing force from the pressing jig 70 along the axial direction. The fixed core 46 will be automatically centered when the force acts, and the axis of the fixed core 46 will not be inclined with respect to the axis of the sleeve 29 during the caulking engagement.

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.

[0035]

As described above, according to the present invention, the fixed core is provided with the spherical contact surface which is aligned with the inner surface of the tip closing portion of the sleeve, and is opposite to the tip closing portion. The locking step portion of the fixed core, which is provided with an annular locking step portion facing the side, and the contact surface of which is in contact with the inner surface of the sleeve distal end blocking portion, is caulked with the intermediate portion of the sleeve by caulking. Since the locking step is formed at the same time when the fixed core is forged, the cutting process is unnecessary and the process can be simplified and the number of processing steps can be reduced. It is possible to surely prevent it from tilting.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a solenoid valve.

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 cross-sectional view showing when the fixed core is fixed to the sleeve.

[Explanation of symbols]

 10 ... Solenoid unit 27 ... Housing main part 29 ... Sleeve 29c ... Tip closing part 42 ... Valve hole 43 ... Valve seat 46 ... Fixed core 47 ... Contact surface 48・ ・ ・ Lock step 49 ・ ・ ・ Movable core 51 ・ ・ ・ Valve V ・ ・ ・ Solenoid valve

Claims (1)

[Claims] 1. A bottomed cylindrical sleeve () having a substantially hemispherical tip closing portion (29c) in a housing main body (27) having a valve seat (43) having a valve hole (42) opened in a central portion thereof. A fixed core (46) in which the base end portion of (29) is continuously provided and is fitted to the tip closing portion (29c) side in the sleeve (29).
The intermediate portion of the sleeve (29) is caulkedly engaged with the movable core (49) which is slidably fitted into the sleeve (29) so as to face the fixed core (46). 43)
A valve body (51) that can be seated on the movable core (4
The solenoid unit (10) for exerting an electromagnetic force to attract 9) to the fixed core (46) side is the sleeve (29).
In the solenoid valve that is disposed surrounding the fixed core (4
6) is provided with a spherical contact surface (47) which is aligned with the inner surface of the tip closing portion (29c) of the sleeve (29) and faces the side opposite to the tip closing portion (29c). An annular locking step (48) is provided, and the contact surface (4
The intermediate portion of the sleeve (29) is caulked to the engaging stepped portion (48) of the fixed core (46) in a state where 7) is brought into contact with the inner surface of the distal end blocking portion (29c) of the sleeve (29). Solenoid valve characterized by being combined.