JP3104424B2 - 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 as a switching valve in a pneumatic hydraulic circuit, and more particularly to an improvement in a technique for managing a stroke of a plunger or the like.

[0002]

2. Description of the Related Art For example, as a switching valve in various pneumatic hydraulic circuits such as a hydraulic circuit of an anti-lock brake device for a vehicle, Japanese Patent Application Laid-Open No. 61-59080 and Japanese Utility Model Publication No. 4-1014
Solenoid valves are frequently used as described in, for example, Japanese Patent Application Laid-Open Publication No. HEI 1 (1999). Then, a kind of such a solenoid valve includes (a) a housing having an accommodation hole,
(B) an excitation coil which is formed in a cylindrical shape and is integrally disposed in the housing concentrically with the housing hole, (c) a sleeve integrally fixed to the housing in the housing hole, d) a plunger arranged in series with the sleeve in the accommodation hole so as to be movable in the axial direction, and which is attracted in a first direction approaching the sleeve by excitation of the exciting coil; A shaft, which is provided so as to be able to move in the axial direction by penetrating in the axial direction, one end of which is fixed to the plunger, and the other end of which is integrally provided with a valve body for controlling opening and closing of a fluid passage. (F) urging means for urging the shaft in a second direction opposite to the first direction, and for urging the plunger away from the sleeve when the exciting coil is in a non-excited state. FIG. 4 is a cross-sectional view showing an example of such a solenoid valve, and shows a state where the exciting coil 80 is not excited.

In the solenoid valve shown in FIG. 4, a ball 78 which can be seated on a valve seat 76 of a seat member 74 is integrally provided at the other end of a shaft 72 whose one end is press-fitted and fixed to a plunger 70. When the exciting coil 80 is excited, the plunger 70 approaches the sleeve 82 in the first position.
When sucked in the direction, that is, in the downward direction in FIG. 4, the ball 78 sits on the valve seat 76 and closes the fluid passage. At this time, there is a predetermined gap delta ₂ between the plunger 70 and the sleeve 82, the ball 78 is adapted to be brought securely seated on the valve seat 76. When the exciting coil 80 is switched from the excited state to the non-excited state, the shaft 72 is moved in the second direction, that is, the upward direction in FIG. 4 by the urging force of the compression coil spring 84 as the urging means. The plunger 70 comes into contact with the stopper 86 to define the moving end in the second direction. Gap Δ between plunger 70 and sleeve 82 in this non-excited state
₁ is determined such that a predetermined suction action is obtained between the two by excitation, and the flow cross-sectional area between the ball 78 and the valve seat 76 is larger than the orifice 96;
Plunger 70 at a constant stroke by subtracting the gap delta ₂ from the gap delta ₁ is moved. The stopper 86 is fixed to the cover 90, and the cover 90 is crimped to the opening at the upper end of the housing 88. When the stopper 86 is fixed to the cover 90, the dimensions X and Y (FIG. 4) shown in FIG. measured in advance axial length) of the plunger 70, the as gap delta ₁ can be obtained based on it, the stopper from the contact surface 92 relative to the housing 88 8
The protrusion dimension Z up to the distal end surface 94 of the sixth element 6 is adjusted. That, Z = X- (Y + Δ 1) and so that, at the previously adjusted the dimension Z projects based on the dimensions X, Y, delta _1.

[0004]

[0007] However, in such a conventional solenoid valve, a gap delta ₁ is changed by the deflection deformation of the caulking state and covers to the cover of the housing, or use variations occur in the performance of the valve There was a problem that it changed during. That is, when the caulking is weak to the cover 90 of the housing 88, the cover 90 and the larger gap delta ₁ in a gap between the housing 88, is weak suction effect between the sleeve 82 and the plunger 70 valve while performance varies, pressing load during caulking is too large resiliently deformed cover 90 inward, cross-sectional flow area of the orifice between the ball 78 and the valve seat 76 by a gap delta ₁ is reduced in the open state When it becomes smaller than 96, the flow path resistance becomes larger than the orifice 96 and the flow rate decreases. Also, in a hydraulic brake device or the like for a vehicle, the inside of the solenoid valve becomes high pressure of, for example, about 300 kg / cm ² or more,
Even when the cover 90 is a gap delta ₁ and deformed outward is increased, the suction effect as described above is weakened.

The present invention has been made in view of the above circumstances, and an object of the present invention is to prevent variations in the performance of a solenoid valve.

[0006]

In order to achieve the above object, a stopper for defining a moving end in the second direction may be provided between the sleeve and the shaft. (B) an exciting coil, (c) a sleeve, (d) a plunger, (e) a shaft,
(F) a solenoid valve provided with an urging means;
(G) when the shaft is moved in the second direction by the urging force of the urging means, the shaft is brought into contact with the sleeve and the second of the shaft and the plunger is moved;
(H) a gap between the sleeve and the plunger in a state where the stopper is in contact with the sleeve, the stopper being provided integrally with the other end of the shaft. The plunger and the shaft are press-fitted and fixed such that the diameter of the plunger becomes a predetermined dimension.

[0007]

In such a solenoid valve, when the shaft is moved in the second direction by the urging force of the urging means, it is brought into contact with the sleeve and the shaft and the plunger are moved in the second direction. A stopper defining a moving end is provided integrally with the other end of the shaft, and a gap between the sleeve and the plunger is predetermined when the stopper is in contact with the sleeve. Since the plunger and the shaft are press-fitted and fixed so as to have the dimensions described above, the plunger and the shaft are fixed to the cover as shown in FIG. The maximum clearance dimension (Δ ₁ ) between the plunger and the sleeve does not vary. As a result, a constant suction action can always be obtained, and an increase in the flow path resistance due to a displacement of the valve element position due to a variation in the gap size is prevented.

[0008]

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

FIG. 1 is a sectional view showing a solenoid valve 10 according to an embodiment of the present invention. The solenoid valve 10 is disposed between a master cylinder and a wheel cylinder in a vehicle hydraulic brake device. Things.
The housing 12 has an upper end in FIG. 1 having a substantially bottomed cylindrical shape, and a lower end having a connected shape that can be assembled to another valve housing or the like (not shown). A large-diameter portion 14 of a stepped accommodation hole 14 formed at one end of the housing 12 and opened upward in the drawing.
In FIG. 3A, an exciting coil 16 in which a conductive wire is wound a predetermined number of times and molded into a cylindrical resin is provided integrally and concentrically with the receiving hole 14. On one side of the exciting coil 16, that is, in the vicinity of the lower part in FIG. 1, a cylindrical sleeve 18 having a through hole 17 at an axial position is formed in the medium diameter portion 14 b of the accommodation hole 14. Are integrally fixed to the housing 12 in a state of being fitted to the housing 12. On the other hand, on the other side of the exciting coil 16, that is, inside the upper part in FIG. 1, a plunger 22 is arranged in series with the sleeve 18 so as to be movable in the axial direction. The cover 20 is swaged to the housing 12 so as to cover the housing hole 14.
Here, the housing 12 and the cover 20 constitute a magnetic circuit as a yoke, the sleeve 18 as a fixed iron core, and the plunger 22 as a movable iron core. The plunger is formed by magnetic flux generated by the excitation of the excitation coil 16. Numeral 22 is designed to be sucked in a first direction approaching the sleeve 18, that is, in a downward direction in FIG.

[0010] One end of a shaft 24 movably arranged in the axial direction through the through hole 17 of the sleeve 18 is press-fitted and fixed to the plunger 22, according to the excitation state of the excitation coil 16. The shaft 24 is the plunger 22
At the same time, it can be moved up and down in FIG. A ball 26 is integrally fixed to the other end of the shaft 24, and a disc flange-like stopper 28 is integrally provided at the other end of the shaft 24, that is, a portion protruding downward from the sleeve 18. ing. On the other hand, the connection shape portion of the housing 12, ie, FIG.
In the lower part of FIG.
1 and caulked and fixed concentrically with the sleeve 18 and the like. In the seat member 30, an oil passage 32 and an orifice 34 are formed at the center of the shaft, and a valve seat 36 is provided at the upper end opening. The opening is closed by seating the ball 26 thereon. It has become so. Between the shaft 24 and the seat member 30, a compression coil spring 38, one end of which is locked by the stopper 28 and the other end of which is locked by a seat surface 37 of the seat member 30, is provided. 24 is urged in a second direction opposite to the first direction, that is, in the upward direction in FIG. For this reason, the end surface (upper surface in FIG. 1) 40 of the stopper 28 on the side of the plunger 22 is in contact with the end surface (lower surface in FIG. 1) 42 of the sleeve 18 on the side opposite to the plunger 22, and the shaft 24 and the plunger 22
The moving end in the second direction is defined by the stopper 28. The ball 26 corresponds to a valve body, and the compression coil spring 38 corresponds to an urging means.

The housing 12 is provided with a port 44 communicating with the oil passage 32 at the other end of the seat member 30, that is, at the lower end in FIG.
A port 46 is provided on a side portion near 6. When the solenoid valve 10 is provided in the vehicle hydraulic brake device, the oil passage on the master cylinder side and the oil passage on the wheel cylinder side are connected to the ports 44 and 46, respectively, so that the excitation coil 16 is excited. , The state of hydraulic pressure propagation between the master cylinder and the wheel cylinder is switched.

That is, in the well-known anti-lock brake system, the exciting coil 16 is set to the excited state, and the plunger 22 is attracted to approach the sleeve 18 against the urging force of the compression coil spring 38, and the plunger 22 is pulled. When the shaft 24 and the shaft 24 move in the valve closing direction (first direction), the ball 26 of the shaft 24 contacts the valve seat 36 of the seat member 30 to close the communication oil passage between the ports 44 and 46, and The brake oil pressure input from the cylinder to the wheel cylinder is cut off to maintain the wheel cylinder oil pressure constant. On the other hand, when the exciting coil 16 is de-energized and the attraction to the plunger 22 is released, the plunger 22 and the shaft 24 are moved in the valve opening direction (second direction) by the urging force of the compression coil spring 38.
Direction), and the stopper 28 is
When the plunger 22 is positioned at the moving end in the second direction that comes into contact with the valve 8, a predetermined gap is created between the ball 26 and the valve seat 36, and the port 44 and the port 4
The circulation between the cylinders 6 is allowed, and the supply of pressure oil from the master cylinder to the wheel cylinder or the return oil from the wheel cylinder to the master cylinder is performed. An oil passage 48 and a check valve 50 are provided in a lower portion of the housing 12 in the vicinity of the seat member 30 to promptly release the hydraulic pressure on the port 46 side.

The stopper 28 is provided at a position where the cross-sectional area of flow between the ball 26 and the valve seat 36 is larger than the orifice 34 when the stopper 28 is in contact with the sleeve 18. Further, a gap delta ₁ between the sleeve 18 and the plunger 22 in this state, as the ball 26 can be firmly seated on the valve seat 36 greater than the axial spacing dimension of it such, and by the excitation of the exciting coil 16 It is predetermined so that a predetermined suction action is obtained between the sleeve 18 and the plunger 22. When the shaft 24 is press-fitted and fixed to the plunger 22, the shaft 24 is inserted into the through hole 17 of the sleeve 18 before the sleeve 18 is assembled to the housing 12, and the plunger 22 and the sleeve 18 are connected to each other as shown in FIG. the spacer jig 52 having equal thickness and the gap delta ₁ in a state sandwiched between, by pressurizing from the rear side of the end face 40 of the stopper 28 by press-fitting head 54 of the pressure device, one end portion of the shaft 24 if so press-fitted into the press-fit hole 56 of the plunger 22, it is possible to manage the gap delta ₁ easily fixed value. The press-fit hole 56 has a predetermined inner diameter so as to obtain a fit in a predetermined tight fit state corresponding to the diameter of the shaft 24. In addition,
The spacer jig 52 has a notch 58 corresponding to the diameter of the shaft 24 so that the spacer jig 52 can move forward and backward in the left-right direction in the figure, as can be seen from FIG. When the press-fitting is performed as described above, a configuration may be adopted in which a load cell is incorporated in the pressurizing device to prevent the spacer jig 52 from being excessively pinched.

The sleeve 1 is in a sub-assembly state with the plunger 22 and the shaft 24 as described above.
8 is a diagram showing an accommodation hole 1 prior to assembling the excitation coil 16.
4 is inserted into the middle diameter portion 14b, and the lower end portion is inserted into the middle diameter portion 14b.
A part of the housing 12 is caulked in a state in which the housing 12 comes into contact with the bottom portion 60 of the housing 12 so as to be integrally fixed to the housing 12. Further, the seat member 30 is provided on the sleeve 1.
After the fixing member 8 is fixed to the housing 12, the gap between the plunger 22 and the sleeve 18 is set to zero, and the seat member 30 is pressed into the housing 12 until the valve seat 36 contacts the ball 26 at the tip of the shaft 24. , the gap is press-fitted to the flow further sheet member 30 by the same dimension as the gaps delta ₂ during closing minus a predetermined stroke the cross-sectional area can be secured from delta _1, the housing 12 in this state
Secure by swaging. The press-fitting of the sheet member 30 is performed while measuring the position of the plunger 22 with a sensor or the like. As a result, the ball 26 and the valve seat 3 in the valve-open state are opened.
The dimensions of between 6 is managed with high precision to a certain size obtained by subtracting the delta ₂ from Notwithstanding the gap delta ₁ in dimensional errors or variations in the members.

In this embodiment, since the dimension from the stopper 28 to the tip of the ball 26 is short and there is almost no dimensional error therebetween, the moving end of the ball 26 in the second direction is higher than the housing 12. It is specified by accuracy. Therefore, before assembling the seat member 30 with the sleeve 18 or the like to the housing 12, the dimension from the bottom portion 60 of the middle diameter portion 14b to the valve seat 36 is a predetermined fixed size, that is, the end surface 40 of the stopper 28. From ball 26
The specified stroke (Δ ₁ −
Even if the shaft 24 is fixed to the housing 12 in a state where it is positioned with respect to the bottom 60 by a jig or the like (not shown) so as to have a size obtained by adding Δ ₂ ), the difference in the press-fit dimension of the shaft 24 with respect to the plunger 22 or the shaft 2
4. Irrespective of variations in the length of the sleeve 18, the distance between the ball 26 and the valve seat 36 in the valve-open state can be managed with high accuracy.

As described above, the solenoid valve 1 of the present embodiment
0 is a disk flange-shaped stopper 28 integrally provided on the other end side of the shaft 24, and an end face 40 of the stopper 28.
Abuts against the end surface 42 of the sleeve 18 to define the moving ends of the shaft 24 and the plunger 22 in the second direction, and the sleeve 18 and the plunger 2 in a state where the stopper 28 is in contact with the sleeve 18.
So that a predetermined gap delta ₁ is formed between the 2, because the shaft 24 and the plunger 22 is press-fitted,
Compared to the conventional apparatus of FIG. 4 fixedly provided a stopper cover, the gap delta ₁ due to how and deflection deformation of the caulking state of the cover 20 does not vary.

That is, for example, even if the cover 20 is weakly swaged with respect to the housing 12 and a gap is formed between them, or if the cover 20 is deformed due to an excessive pressing load at the time of swaging, the sleeve 18 and the cover 18 may be deformed. Plunger 2
Gap delta ₁ and 2 is because any never being affected, also, hydraulic pressure housing 12 from the master cylinder
Even cover 20 acts within are resiliently deformed outward, it's not a gap delta ₁ is changed. As a result, a constant suction action can always be obtained. Moreover, in this way from a gap delta ₁ is maintained constant, the gap delta ₁
The gap between the ball 26 and the valve seat 36 in the valve-open state changes due to the variation in the flow rate, and the flow path resistance between them does not change.

Meanwhile, the gap delta _1, the shaft 24 and to be adjusted by the press-fit dimensions of the plunger 22, the dimensions X and Y for each individual valve as in the conventional device of FIG. 4
Is measured and the protrusion dimension Z is adjusted,
The adjustment work can be performed easily and quickly. That is, the end surface 40 of the stopper 28 is
In contact with the 2, the shaft 24 so that a gap delta ₁ is formed between the plunger 22 and the sleeve 18
Is fixed to the plunger 22 by press-fitting, so that even if the lengths of the sleeve 18, the plunger 22, and the shaft 24 vary, there is no need to consider it. Sleeve Particularly, in this embodiment by inserting a spacer jig 52 between the plunger 22 and the sleeve 18, because you have to press-fix the shaft 24 to the plunger 22, the gap delta ₁ adjustment operation, in other words The work of assembling the shaft 18, the shaft 24 and the plunger 22 is further facilitated.

Further, in the solenoid valve 10 of this embodiment, since the stopper 28 is provided integrally with the shaft 24, it is not necessary to separately prepare the stopper 86 as in the conventional device of FIG. There is no need to provide the cover 20 with a fitting portion for press-fitting and fixing the 86.

Further, since the stopper 24 is provided on the shaft 24, it is possible to lock one end of the compression coil spring 38 to the stopper 28. As shown in FIG. There is an advantage that the stepped portion 98 in FIG. 4 can be eliminated and the compression coil spring 38 having a larger diameter can be employed as compared with the case where the shaft 24 is stepped.

While the embodiment of the present invention has been described in detail with reference to the drawings, the present invention can be embodied in other forms.

For example, in the above-described embodiment, the ball 26 which can be brought into contact with the valve seat 36 of the seat member 30 is provided at the other end of the shaft 24 as a valve body. A spool or the like that can be moved between ports may be used as a valve body.

In the above-described embodiment, the compression coil spring 38 is interposed between the stopper 28 and the seat member 30. However, a dedicated locking portion is provided on the shaft 24 or the shaft member 24 can be replaced. Alternatively, other urging means for urging the shaft 24 in the second direction may be employed.

In the above-described embodiment, the solenoid valve 10 used in the hydraulic brake device for a vehicle has been described. However, the present invention can be similarly applied to a solenoid valve used in another pneumatic hydraulic circuit. The oil passage 48 and the check valve 50 may be appropriately provided as needed.

Although not specifically exemplified, the present invention can be implemented in various modified and improved modes based on the knowledge of those skilled in the art.

[Brief description of the drawings]

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

FIG. 2 is a view illustrating a step of press-fitting and fixing a plunger and a shaft in the solenoid valve of FIG. 1;

FIG. 3 is a plan view showing a spacer jig used in the process of FIG. 2;

FIG. 4 is a sectional view showing an example of a conventional solenoid valve.

[Explanation of symbols]

 10: Solenoid valve 12: Housing 14: Housing hole 16: Exciting coil 18: Sleeve 22: Plunger 24: Shaft 26: Ball (valve element) 28: Stopper 38: Compression coil spring (biasing means)

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-4-151080 (JP, A) JP-A-60-78110 (JP, U) JP-A-2-48686 (JP, U) JP-A 57- 93677 (JP, U) Japanese Utility Model 63-32956 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16K 31/06-31/11

Claims (1)

(57) [Claims] A housing having a housing hole formed therein; an excitation coil formed in a cylindrical shape and concentric with the housing hole and integrally formed with the housing; A fixed sleeve, a plunger disposed in series with the sleeve in the accommodation hole so as to be movable in the axial direction, and attracted in a first direction approaching the sleeve by excitation of the excitation coil; The sleeve is axially penetrated and disposed so as to be movable in the axial direction. One end is fixed to the plunger, and the other end is integrally provided with a valve body that controls opening and closing of a fluid passage. A shaft; and a biasing means for biasing the shaft in a second direction opposite to the first direction and for separating the plunger from the sleeve when the exciting coil is in a non-excited state. When the shaft is moved in the second direction by the urging force of the urging means, the solenoid valve is brought into contact with the sleeve to define a moving end of the shaft and the plunger in the second direction. A stopper is provided integrally with the other end of the shaft, and in a state where the stopper is in contact with the sleeve, a gap between the sleeve and the plunger has a predetermined dimension. Wherein the plunger and the shaft are press-fitted and fixed.