JPH09119552A - Solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with machining to a fixed core and shorten the fixed core by forming a magnet killer into ring shape of a thin plate with a width small than the depth of flow grooves provided at a movable core, and interposing the magnet killer between the fixed core and the movable core. SOLUTION: In a solenoid valve device for anti-lock brake control, a magnet killer 37 made of nonmagnetic material is interposed between a fixed core and a movable core 19c in order to avoid the delay of alienating action of the movable core 19c from the fixed core, and the outer surface of the movable core 19c is provided with a plurality of flow grooves 38... over both axial ends. The magnet killer 37 is formed into ring shape of a thin plate with constant width D1 along a circumferential direction, and the depth D2 of each flow groove 38 is set larger than the width D1 . This constitution solves such a problem that at least one of the flow grooves 38 is closed by the magnet killer 37 in the case of relative displacement being generated in a guide cylinder 15c.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a space between a fixed core fixedly arranged on one end side of a guide cylinder and an inner surface of the guide cylinder facing the fixed core and slidably fitted to the guide cylinder. And a non-magnetic core provided between the movable core and the fixed core by restricting the proximity movement of the movable core to the fixed core side, and a flow groove that allows the hydraulic fluid to flow in the axial direction between both ends in the axial direction. The present invention relates to a solenoid valve including a material magnet killer.

[0002]

2. Description of the Related Art Conventionally, such an electromagnetic valve is already known from, for example, Japanese Utility Model Publication No. 7-3106.

[0003]

In such a solenoid valve, the magnet killer for avoiding the direct contact of the movable core with the fixed core moves when the flow groove between both ends of the movable core is closed. The smooth operation of the core is hindered. In the above-mentioned conventional one, a magnet killer is formed by a non-magnetic material in a cylindrical shape and has a plurality of notches at one end on the movable core side. Is fitted to the fixed core so as to project toward the movable core. However, if such a magnet killer is used, it is necessary to perform processing such as providing a fitting hole for fitting the magnet killer in the fixed core, and the axial length of the fixed core is increased by the amount of the fitting hole. Inevitably, it was difficult to make the solenoid valve smaller.

The present invention has been made in view of the above circumstances, and the magnet killer has a simple structure that does not require machining on the fixed core and enables the fixed core to be shortened, thereby avoiding blockage of the flow groove. It is intended to provide a solenoid valve in which is arranged.

[0005]

In order to achieve the above object, the present invention provides a fixed core fixedly arranged on one end side of a guide cylinder and a slidable fitting to the guide cylinder facing the fixed core. And a movable core provided with an outer surface on both sides in the axial direction for allowing the working fluid to flow between the movable core and the inner surface of the guide cylinder, and the movable core is restricted to move toward the fixed core side to move. In a solenoid valve provided with a magnet killer made of a non-magnetic material provided between a core and a fixed core, the magnet killer is formed in a thin plate ring shape having a width smaller than a depth of a flow groove provided in the movable core. And is interposed between the fixed core and the movable core.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below based on one embodiment of the present invention shown in the accompanying drawings.

FIGS. 1 to 5 show an embodiment of the present invention, and FIG. 1 is a longitudinal sectional view of an electromagnetic valve device.
1 is a cross-sectional view taken along line 1-1, FIG. 2 is a plan view taken along the arrow 2 in FIG. 1 in a state where a lid is omitted, and FIG. 3 is a cross-sectional view showing an end surface of a movable core of a normally closed solenoid valve on the fixed core side. 4 is a perspective view of the movable core and the magnet killer, and FIG. 5 is a perspective view of the magnetic path forming frame.

First, in FIGS. 1 and 2, this solenoid valve device is for controlling an antilock brake of a four-wheel vehicle, for example, and four normally-open solenoid valves V _O ... and four of the normally closed solenoid valve V _C ...
Are arranged on a common base 11 made of metal.

The normally open solenoid valve V _O includes a valve actuation unit 12
_O , each normally open solenoid valve V _O ... And each normally closed solenoid valve V _C
Common to the coil unit 13 and the coil unit 13
And a magnetic path forming frame 14 attached to the.

The valve operating unit 12 _O is provided with a valve housing 17 _{O in} which a base end of a guide cylinder 15 _O formed in a bottomed cylindrical shape with its front end closed is connected to a housing main body 16 _O. , which is fixed stationary core 18 _O fixedly disposed in the proximal portion of the guide tube 15 _O, the movable core 19 _O which faces the stationary core 18 _O contained in the guide tube 15 _O, the valve housing 17 _O in conjunction with the movable core 19 _O as possible the seating of the valve seat member 20 _O, the valve body 21 _O is connected,
And disposed in the valve components are valve housing 17 _O spring 22 _O, etc. return for biasing the direction i.e. valve body 21 _O in the direction of separating from the valve seat member 20 _O to separate the movable core 19 _O from the stationary core 18 _O To be done.

The housing main body 16 _O is formed of a magnetic metal in a stepped cylindrical shape, and a fixed core 18 _O formed in a cylindrical shape is integrally and coaxially connected to one end thereof. The guide cylinder 15 _O is formed of a non-magnetic material such as stainless steel into a thin-walled bottomed cylinder having a hemispherical closed end, and the base end of the guide cylinder 15 _O is located inside the base end. The fixed core 18 _O is fitted into the housing main body 16 _O by welding, for example.

A stepped fitting hole 23 _O is opened in one surface 11 a of the base body 11 so that the housing main body 16 _O can be fitted therein, and the fitting hole 23 _O has an inner surface near the opening end. retaining ring 2 engages the housing main 16 _O and prevents withdrawal from the fitting hole 23 _O of the housing main 16 _O
4 _O is fitted. Moreover, when the housing main body 16 _O is fitted and fixed in the fitting hole 23 _O , the guide cylinder 15 _O is the base body 1
1 is projected from the one surface 11a. Also the housing main body 1
Annular seal members 25 _O and 26 _O are mounted at two axially spaced positions on the outer surface of 6 _O , and between the base member 11 and the housing main body 16 _O between these seal members 25 _O and 26 _O. An annular chamber 27 _O is formed therein.

A cylindrical valve seat member 20 _O is press-fitted and fixed to the housing main body 16 _O. The housing main body 16
The _O and the non-magnetic material made of the valve stem 28 is slidably fitted in one end of the valve shaft 28 is slidably fitted so as to face the fixed core 18 _O in the guide cylinder 15 _O Movable core 19
_O in contact with the one end of the valve body 21 _O seating available spherical the valve seat member 20 _O is fixed to the other end of the valve shaft 28. Moreover, in the valve chamber 29 _O formed between the other end of the valve shaft 28 and the valve seat member 20 _O , the return spring 22 that biases the valve shaft 28, that is, the valve body 21 _O in the direction away from the valve seat member 20 _{O. O} is stored. Thus, when the magnetic attraction force to the fixed core 18 _O side does not act on the movable core 19 _O , the movable core 1 _O
9 _O is in a retracted position until it is received by the tip closing portion of the guide cylinder 15 _O by the spring force of the return spring 22 _O.

A filter 31 is mounted on the housing main body 16 _O so as to be interposed between a brake pressure passage 30 provided on the base body 11 and connected to a master cylinder (not shown) and the valve seat member 20 _O. The filter 32 on the outer periphery of the housing main 16 _O in the portion facing the annular chamber 27 _{O O}
Is attached to the valve chamber 29 through the filter 32 _O.
Passage 33 _O for the _O providing communication to the annular chamber 27 _O is provided in the main housing body 16 _O. Furthermore between the valve seat member 20 _O and the filter 31 of the main housing body 16 _O, brake pressure passage hydraulic fluid of the annular chamber 27 _O to open when the pressure of the brake pressure passage 30 is lower than the annular chamber 27 _O Thirty
A check valve 34 for recirculating to the side is provided.

The normally closed solenoid valve V _C includes a valve actuation unit 12
_C , the coil unit 13, and the magnetic path forming frame 14 attached to the coil unit 13.

The valve actuating unit 12 _C is provided with a valve housing 17 _{C in} which a base end of a guide cylinder 15 _C whose front end is closed is connected to a housing main body 16 _C, and the front end of the guide cylinder 15 _C is provided. A fixed core 18 _C fixed to the valve core, a movable core 19 _C facing the fixed core 18 _C and housed in the guide cylinder 15 _C and the housing main body 16 _C , and a valve seat member 20 fixed to the valve housing 17 _{C. The} valve body 21 _C fixed to the movable core 19 _C by enabling the seating on _C , and the direction in which the movable core 19 _C is separated from the fixed core 18 _C , that is, the direction in which the valve body 21 _C is seated on the valve seat member 20 _C. Valve components such as a biasing return spring 22 _C are disposed in the valve housing 17 _C.

The housing main body 16 _C is formed of a magnetic metal into a stepped cylindrical shape, and a cylindrical connecting tubular portion 35 is integrally and coaxially connected to one end thereof. Guide tube 15
_C is formed into a thin cylindrical shape having a hemispherical closed end by fixing the fixed core 18 _{C to} one end of a cylindrical sleeve 36 made of a non-magnetic material such as stainless steel. proximal end of the guide tube 15 _C is, as allowed to fitting the connection tubular part 35 at its proximal end portion, for example, is coupled to the main housing body 16 _C by welding.

A stepped fitting hole 23 _C opened on one surface 11 a of the base body 11 is formed so that the housing main body 16 _C can be fitted therein, and the fitting hole 23 _C has an inner surface near the opening end. retaining ring 2 engages the housing main 16 _C by preventing the withdrawal from the fitting hole 23 _C of the main housing body 16 _C
4 _C is fitted. Moreover, when the housing main body 16 _C is fitted and fixed in the fitting hole 23 _C , the guide cylinder 15 _C is fixed to the base 1
1 is projected from the one surface 11a. Also the housing main body 1
Annular seal members 25 _C , 26 _C are mounted at two axially spaced positions on the outer surface of 6 _C , and between the base member 11 and the housing main body 16 _C between these seal members 25 _C , 26 _C. An annular chamber 27 _C is formed therein.

Housing main body 16_CHas a cylindrical valve seat
Material 20_CIs pressed in and fixed. In addition, the guide tube 15_CIn
The sleeve 36 and the housing main body 16_CFixed to
Core 18_CMovable core 19 with one end facing the_CIs sliding
The valve seat member 20 is fitted as much as possible._CSpherical that can be seated on
Valve body 21_CIs the movable core 19_CIs fixed to the other end of. I
Kamo movable core 19_CEnd and fixed core 18_CBetween
Is the movable core 19_CThat is, the valve body 21_CFixed core 18
_CAway from the valve seat member 20_CIn the direction of approaching
Biasing return spring 22_CIs stored. Thus the movable core
19_CFixed to the core 18_CThe magnetic attraction force to the side is acting
When there is no valve body 21,_CIs the valve seat member 20 _CSeated in
In position.

By the way, the movable core 1 is provided on the fixed core 18 _C side.
If the movable core 19 _C is brought into direct contact with the fixed core 18 _C when 9 _C is magnetically attracted, the remanent operation of the movable core 19 _{C from} the fixed core 18 _C is delayed due to residual magnetism when the magnetic attraction force is released. Fixed core 1 to avoid that
A magnet killer 37 made of a non-magnetic material as shown in FIGS. 3 and 4 is interposed between 8 _C and the movable core 19 _C.
In addition, the hydraulic fluid is trapped in the valve chamber 29 _C between the fixed core 18 _C and the movable core 19 _C , and between the movable core 19 _C and the valve seat member 20 _C, which hinders the smooth operation of the movable core 19 _C. In order to avoid it, the outer surface of the movable core 19 _C is provided with one or a plurality of flow grooves 38 ... Between both ends in the axial direction.

The magnet killer 37 is formed, for example, in the shape of a thin plate ring having a constant width D ₁ along the circumferential direction. On the other hand, the depth D ₂ of each flow groove 38 is set larger than the width D _{1 of the} magnet killer 37.
According to this structure, the guide cylinder 1 _C is provided in the guide cylinder 15 _C.
Even if relative displacement of the magnet killer 37 with respect to the movable core 19 _C occurs in a plane orthogonal to the axis of 5 _C , the magnet killer 37 does not block at least one of the flow grooves 38 ... _At one end of _C , all of the flow grooves 38 ... Are in a state where a part of them is always open.

[0022] In FIG. 1, the annular chamber 27 on the outer periphery of the housing main 16 _C at a portion facing the _C and filter 32 _C is mounted, the valve chamber 29 through the filter 32 _{C C}
A passage 33 _C is provided in the housing main body 16 _C for communicating the annular chamber 27 _C with the annular chamber 27 _C. A brake pressure path 39 connected to a wheel brake (not shown) is provided on the base body 11.
A release passage 40 is provided so as to be connected to the annular chambers 27 _O and 27 _C adjacent to each other and connected to a reservoir (not shown) so as to be connected to the valve seat member 20 _C of the normally closed solenoid valve V _C.

The coil unit 13 is the valve operating unit 1
A plurality of bobbins 41 having a central hole 41a through which the guide cylinders 15 _O ..., 15 _{C of} 2 _O ..., 12 _C ... Are loosely combined, and the coils 42 are wound around these bobbins 41. It is embedded in a mold part 43 made of resin. The mold portion 43 is integrated with a rectangular frame body 44 that is fastened to the one surface 11a of the base body 11 and has a lid 55 detachably attached, and is wound around each bobbin 41 and each bobbin 41. A plurality of coil corresponding portions 4 formed by covering the coils 42 individually and forming a cylindrical shape.
3a ... Further, a conductor support member 45 made of synthetic resin is embedded in the mold portion 43 so as to be located between the arrangement positions of the normally open solenoid valves V _O ... And the arrangement positions of the normally closed solenoid valves V _C. The conductors 46 provided on the conductor supporting member 45 are connected to the coils 42.
Moreover, the conductor support member 45 is integrally provided with a coupler 47 that projects outward from the frame body 44 in a state of being embedded in the mold portion 43.

Referring also to FIG. 5, the magnetic path forming frame 14
Is a rectangular magnet that has a fitting hole 48 into which one end of one of the guide cylinders 15 _O and 15 _C protruding from one end of the coil corresponding portion 43a is fitted and which faces the one end of the coil corresponding portion 43a. Road plate 49, fixed core 18 _O, and connecting tubular portion 3
5 has a through hole 50 into which any one of 5 is inserted in the central portion and is coupled with a bottomed cylindrical magnetic path tube 52 having a dish-shaped contact portion 51 facing the other end of the coil corresponding portion 43a as a closed end. It is made up of

On the opening end side of the magnetic path tube 52 having a cylindrical shape with a bottom, a pair of connecting arm portions 53, 5 located on one diameter line thereof.
3 are integrally connected to each other, and the ends of the connecting arm portions 53, 53 are in contact with both ends of the magnetic path plate 49. Moreover, the connecting arm 5
A pair of caulking portions 53 provided on both sides of the tip end portions of 3, 53
are caulkedly engaged with both ends of the magnetic path plate 49 that is in contact with the tips of the connecting arm portions 53, 53, whereby the magnetic path plate 49 and the magnetic path tube 52 are mutually connected. The magnetic path forming frame 14 is formed by being combined.

The magnetic path frame 14 is connected to the coil unit 13 by mutually connecting a magnetic path tube 52 into which the coil corresponding portion 43a is inserted and a magnetic path plate 49 facing one end of the coil corresponding portion 43a. The magnetic path frame 14 is allowed to move with respect to the coil corresponding portion 43a, and the distance between the magnetic path plate 49 and the contact portion 51 and the inner diameter of the magnetic path tube 52 are set. The magnetic path frame 14 is attached to the coil unit 13 while allowing the magnetic path frame 14 to move freely with respect to the coil corresponding portion 43a.

In the magnetic path frame 14, the diameter of the fitting hole 48 formed in the magnetic path plate 49 is set to the guide cylinder 15 _O , 1.
The inner surface of the fitting hole 48 is set so as to come into contact with the outer surfaces of the guide cylinders 15 _O and 15 _C when either of the 5 _C is fitted, while the insertion hole provided in the abutting portion 51. The diameter of 50 is set so that the guide cylinders 15 _O and 15 _C can be loosely passed through.

Further, between the other end of each coil corresponding portion 43a ... And the contact portion 51 of each magnetic path forming frame 14, the corresponding contact portion 51 is brought into contact with one of the housing main bodies 16 _O and 16 _C. The springs 54, ...

Next, the operation of this embodiment will be described. The plurality of magnetic path forming frames 14 for magnetically coupling the tip end portions of the guide cylinders 15 _O and 15 _C and the housing main bodies 16 _O and 16 _C are the coils. Cylindrical coil formed in the mold part 43 by individually covering each bobbin 41 and the coil 42 on a synthetic resin mold part 43 in which a plurality of bobbins 41 ... The bobbin 41 is mounted so that it can be freely moved with respect to the corresponding portion 43a, and the guide cylinder 15 is provided in the center hole 41a of each bobbin 41.
_O and 15 _C are loosely passed. Therefore the substrate 1
A plurality of valve actuation units 12 _O ..., 12 _C mounted on one
, And the relative position tolerance between each coil corresponding portion 43a in the coil unit 13 integrated with the frame body 44 fastened to the base body 11 is absorbed by the movement of the magnetic path forming frame 14.
The guide cylinders 15 _O ..., In the center holes 41 a of the bobbins 41.
15 _C ... smoothly inserted, and each guide cylinder 15 _O ..., 1
5 _C can be fitted into the fitting holes 48 of the magnetic path forming frame 14, and the work of mounting the coil unit 13 on the base 11 can be facilitated.

Further, the abutting portion 51 of each magnetic path forming frame 14 is provided between each coil corresponding portion 43a and each magnetic path forming frame 14.
.. are respectively provided to the housing main bodies 16 _O , 16 _C, and so on, so that the magnetic path forming frame 14 can move freely with respect to the coil corresponding portion 43 a. housing main 16 the contact portion 51 ... at the time of mounting to the substrate 11 of the coil unit 13 _O ..., 16 _C
The housing main body 16 _O ..., 16
The magnetic coupling between _C ... And the magnetic path forming frame 14 ... can be ensured.

In the normally closed solenoid valve V _C , the magnet killer 37 interposed between the fixed core 18 _C and the movable core 19 _C has a depth of the flow grooves 38 provided on the outer surface of the movable core 19 _C. Since it is formed in a ring shape of a thin plate having a width D ₁ smaller than the width D ₂ , the flow grooves 38 ...
It is possible to simplify the structure for preventing direct contact between the fixed core 18 _C and the movable core 19 _C while preventing any of them from being blocked by the magnet killer 37.
Moreover, there is no need to perform special processing for disposing the magnet killer 37 on the fixed core 18 _C side, and the conventional one (Japanese Utility Model Publication No. 73106) in which the magnet killer is fitted to the fixed core Fixed core 1 in comparison
The axial direction can be shortened by 8 _{C, and} the normally closed solenoid valve V _C can be downsized.

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 magnet killer 37 does not have to have a perfect circular shape as in the above embodiment, but may have an elliptical shape. The present invention can also be applied to a normally open solenoid valve.

[0034]

As described above, according to the present invention, the magnet killer is formed in the shape of a ring of a thin plate having a width smaller than the depth of the flow groove provided in the movable core. Since it is interposed between the magnetic core and the magnetic killer, it is possible to simplify the structure that prevents the fixed core and the movable core from directly contacting each other while preventing the flow groove from being blocked by the magnetic killer. It is not necessary to perform special processing for disposing, and the axial length of the fixed core can be shortened, and the solenoid valve can be downsized.

[Brief description of the drawings]

1 is a longitudinal sectional view of an electromagnetic valve device, which is a sectional view taken along line 1-1 of FIG.

FIG. 2 is a plan view taken along arrow 2 of FIG. 1 with a lid omitted.

FIG. 3 is a cross-sectional view showing an end surface of a movable core of a normally closed solenoid valve on a fixed core side.

FIG. 4 is a perspective view of a movable core and a magnet killer.

FIG. 5 is a perspective view of a magnetic path forming frame.

[Explanation of symbols]

15 _C ... Guide tube 18 _C ... Fixed core 19 _C ... Movable core 37 ... Magnet killer 38 ... Distribution groove D ₁ ... Magnet killer width D ₂ ... Distribution groove depth

Claims (1)

[Claims] 1. A guide tube (15)_C) Fixed arrangement on one end side
Fixed core (18_C) And a fixed core (18_C) To
Facing the guide tube (15_C) Is slidably fitted to
Moni guide tube (15_C) To allow the working fluid to flow
Allowable flow groove (38) is on the outer surface between both ends in the axial direction.
The movable core (19_C) And the movable core (19
_C) Fixed core (18_C) Side movement is restricted
Dynamic core (19_C) And fixed core (18_C) Between
With a magnetic killer (37) made of non-magnetic material
The magnet killer (37) is movable in the solenoid valve
Core (19_C), The depth of the flow groove (38) (D)
_Two) Less than (D ₁) Has a ring shape
Formed and fixed core (18_C) And movable core (1
9_C) A solenoid valve characterized by being interposed between them.