JP2001280533A - Assembly structure of solenoid valve, and brake device with the assembly structure applied - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make pressure control performable of high accuracy, by preventing application of a load of rigidity or more to a guide due to increasing of the load pressing in the guide. SOLUTION: A guide 9 is constituted by having a guide cylinder part 9b received to an upper storage hole 3, a step cylinder part 9d received to a lower storage hole 4, a press part 4c formed as a step difference part by the guide/step cylinder parts 9b, 9d to press a stepped part 18 by the upper/lower storage hole 3, 4, and a guide minimum diameter part 9e diametrically contracting the step cylinder part 9d. Of these constitutional parts, a clearance 17 is formed between an external peripheral surface of the guide minimum diametric part 9e and an internal peripheral surface of the lower storage hole 4, so as to make partly a housing 2, plastically deformed by calking, flow into the clearance 17. In this way, the axial adhesive length of the internal peripheral surface of the lower storage hole 4 and the step cylinder part 9d of the guide 9 is limited, and increasing of a load pressing in the guide can be suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an assembling structure of an electromagnetic valve assembled to a housing and a brake device to which the same is applied, for example, disposed in a pipeline of a vehicle brake device, for an ABS (anti-skid control).
It can be applied to small and lightweight solenoid valves of various hydraulic units including those for side slip control.

[0002]

2. Description of the Related Art Conventionally, as an electromagnetic valve used for an ABS or the like, there is one disclosed in Japanese Patent Application Laid-Open No. 11-108301. This solenoid valve is shown in FIG.

[0003] A cylindrical caulking pressing portion 101c is provided on the outer peripheral portion of the guide 101 of the solenoid valve. Also,
A lower cylindrical portion 101d having a smaller diameter than the caulking pressing portion 101c extends from the caulking pressing portion 101c downward.

The housing 102 of the hydraulic unit is
After the guide 101 is inserted into the storage hole 103 provided in the guide, the guide shoulder surface 104 is pushed in the axial direction by a press machine or the like,
By crimping the pressing portion 101c into the stepped portion 106 of the storage hole, the solenoid valve is assembled to the housing 102.

At this time, the inner wall portion of the storage hole 103 is plastically deformed by the caulking pressing portion 101c, and the lower cylindrical portion 101c is deformed.
By bringing the guide 101 into close contact with the outer peripheral surface, a hydraulic seal between the M / C side and the pump side on the outer peripheral surface of the guide 101 is obtained.

[0006]

However, the more the guide 101 is pushed in the axial direction, the more the pushing load increases, and the load is applied more than the rigidity of the guide.
5 is deformed, or the guide cylindrical portion 101b near the downstream communication hole 105 is plastically deformed like a drum.

As a result, the axial length of the solenoid valve is reduced,
The stroke of the plunger 107 formed inside the solenoid valve becomes small, the pressure loss increases, and the problem that an appropriate hydraulic pressure gradient required at the time of brake control or the like cannot be obtained, or the magnetic gap changes, Since the suction force characteristic of the solenoid valve changes, a problem arises in that high-precision differential pressure control required in side slip control or the like cannot be performed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and prevents a load higher than rigidity from being applied to a guide due to an increase in a guide pushing load, and uses a solenoid valve capable of performing high-precision pressure control. It is an object of the present invention to provide a brake device for a vehicle.

[0009]

According to the first aspect of the present invention, an electromagnetic valve (1) having a guide (9) having a substantially cylindrical shape is formed in a housing (2). In the assembled structure of the solenoid valve, the inner wall surface of the concave portion and the outer peripheral surface of the guide are brought into close contact with each other by hydraulically sealing the housing by caulking and plastically deforming the housing. The outer peripheral surface of the guide is provided with a contact length limiting means for restricting the contact length between the inner wall surface of the concave portion in the axial direction of the guide and the outer peripheral surface of the guide.

As described above, the provision of the contact length limiting means makes it possible to suppress an increase in the pushing load in the caulking step. Thereby, the downstream communication hole portion and the guide can be prevented from being deformed in a drum shape, and a solenoid valve capable of performing high-precision pressure control can be provided.

In the invention described in claim 2, the recess formed in the housing has a larger diameter at the inlet side than at the bottom side, and an upper storage hole (3) is formed at the inlet side of the recess.
A lower storage hole (4) is formed on the bottom side of the recess,
The guide has a guide cylindrical portion (9) accommodated in the upper accommodation hole.
b), a step cylindrical portion (9d) accommodated in the lower storage hole and smaller in diameter than the guide cylindrical portion, and a stepped portion formed by the guide cylindrical portion and the step cylindrical portion, the step being formed by the upper storage hole and the lower storage hole. It has a pressing portion (9c) for pressing the portion (18) and a guide small-diameter portion (9e) obtained by reducing the diameter of the step cylindrical portion, and has an outer peripheral surface of the guide small-diameter portion and a lower storage hole. It is characterized in that the contact length is limited by a gap formed between the peripheral surface and the peripheral surface.

As described above, by forming a gap between the outer peripheral surface of the guide small diameter portion and the inner peripheral surface of the lower storage hole,
A contact length limiting means can be configured.

In this case, for example, as described in claim 3, the guide small diameter portion can be constituted by a groove formed on the outer periphery of the step cylindrical portion.

According to the fourth aspect of the present invention, the guide has a large-diameter guide portion (9a) housed in the upper storage hole, and the outer periphery of the large-diameter guide portion has a groove (1).
5) is formed, and the bottom side of the concave portion with respect to the groove portion of the large-diameter guide portion has a stepped shape that forms a gap (24) between the large-diameter guide portion and the inner wall surface of the upper storage hole. It is characterized by having.

As described above, when the housing is also caulked in the groove formed in the large-diameter portion of the guide to seal, the bottom side of the concave portion of the large-diameter portion of the guide with respect to the groove is defined as the large-diameter guide portion. If the stepped shape forms a gap (24) between the inner wall surface of the upper storage hole and the inner wall surface of the upper storage hole, the gap can constitute a contact length limiting means.

The reference numerals in parentheses of the above means indicate the correspondence with specific means described in the embodiments described later.

[0017]

(First Embodiment) FIG. 1 shows a sectional configuration of a solenoid valve 1 according to a first embodiment of the present invention.

The solenoid valve 1 shown in FIG. 1 is fixed by caulking in a recess formed in a housing 2. The recess formed in the housing 2 is formed in a stepped shape, and the entrance side is larger in diameter than the bottom side. The bottom side of this recess is AB
The pipe is connected to a pipe connected to a pump used for S control, and the inner peripheral wall of the recess is connected to the master cylinder side. In the following description, the entrance side of the recess is referred to as an upper storage hole 3, and the bottom side of the recess is referred to as a lower storage hole 4.

The solenoid valve 1 is driven by energizing a solenoid 5. This solenoid valve 1 has a solenoid 5
A plunger 6 as a mover driven by
A sleeve 7 that covers the outer periphery of the plunger 6 and slidably holds the plunger 6, a rod-shaped control piston 8 that is pressed and moves with the movement of the plunger 6, and a control that covers the outer periphery of the control piston 8 A guide 9 for slidably holding the piston 8 is provided.

The solenoid 5 changes the amount of magnetic flux in proportion to the magnitude of the applied current. The yoke 5 through which the magnetic flux penetrates so as to cover the outer periphery of the solenoid 5
a is arranged.

The sleeve 7 is formed of a non-magnetic stainless steel. This sleeve 7 has a plunger 6
In order to restrict the movement of the guide to a predetermined amount, the upper end side in FIG. 1 is closed, and the lower end side is joined to the upper end of the guide by welding.

The control piston 8 is formed of a non-magnetic stainless steel and constitutes a body valve (valve element). The control piston 8 has a large-diameter portion 8a at the upper end and a small-diameter portion 8b at the lower end, and the tip of the small-diameter portion 8b is a conical needle tip 8c. The needle tip 8c is configured to close the communication hole 12 of the cylindrical valve seat 11 fitted inside the guide hollow portion 10 and block the flow path of the brake fluid. The control piston 8 is urged by a spring 13 in the valve opening direction.

The guide 9 is made of an iron alloy (iron or the like) having a higher hardness than the aluminum alloy as the material of the housing 2. The guide 9 has a substantially cylindrical shape having a hollow portion, and constitutes a stator from which the plunger 6 is sucked. Then, the inside of the hollow portion of the guide 9 is controlled by the control piston 8.
Slides. The hollow portion of the guide 9 communicates with the master cylinder through a distal end communication hole 14 formed in a side surface of the guide 9.

The guide 9 has a guide maximum diameter portion 9a having a diameter substantially equal to the diameter of the upper storage hole 3 formed in the housing 2, and a guide smaller in diameter than the guide maximum diameter portion (guide large diameter portion) 9a. A cylindrical portion 9b, a step cylindrical portion 9d smaller in diameter than the guide cylindrical portion 9b and slightly smaller than the diameter of the lower storage hole 4, and a guide minimum diameter portion (guide small diameter portion) 9e in which the step cylindrical portion 9d is further reduced in diameter. And

A V-shaped groove (groove) 15 is provided on the outer peripheral wall of the guide maximum diameter portion 9a so as to extend around the outer circumference of the guide maximum diameter portion 9a. The inside of the V-shaped groove 15 is buried by the inner wall surface of the plastically deformed housing 2. The V-shaped groove 15 and the inner wall of the housing 2 ensure the sealing performance between the master cylinder side and the outside of the housing (hereinafter referred to as upper sealing performance).

The guide cylinder 9b has a diameter larger than the diameter of the lower storage hole 4 formed in the housing 2.
A step formed by the guide cylindrical portion 9b and the step cylindrical portion 9d constitutes a pressing portion 9c. A filter 16 is externally provided on the outer periphery of the guide cylindrical portion 9b to prevent foreign matter from entering from the master cylinder side.

The inner peripheral surface of the lower storage hole 4 is crimped to the outer peripheral surface of the step cylindrical portion 9d. The seal between the master cylinder and the pump (hereinafter referred to as lower seal) is secured by the outer peripheral surface of the stepped cylindrical portion 9d and the inner wall surface of the lower storage hole 4.

The guide minimum diameter portion 9e is configured to be smaller than the diameter of the lower storage hole 4 so that a gap 17 is formed between the outer peripheral surface of the guide minimum diameter portion 9e and the inner peripheral surface of the lower storage hole 4. I have to. This gap 17 constitutes a relief portion.

Next, assembling of the solenoid valve 1 having the above configuration will be described. FIG. 2 shows an assembling process for securing the lower sealing property, and shows a state in which the solenoid valve 1 is caulked and fixed to the housing 2. FIGS. 3A to 3C sequentially show the state of the caulking and fixing.

First, when the guide 9 is inserted into the recess formed in the housing 2, as shown in FIG. 3A, the guide minimum diameter portion 9e and the step cylindrical portion 9d are moved to the lower storage hole 4.
The caulking pressing portion 9c is in contact with the stepped portion 18 of the upper storage hole 3 and the lower storage hole 4.

Next, when the guide shoulder surface 19 shown in FIG. 2 is pushed in the direction of insertion into the recess by a press or the like,
As shown in (b), the caulking pressing portion 9c bites into the stepped portion 18. Thereby, the inner peripheral surface of the lower storage hole 4 is plastically deformed, and the gap 20 formed between the outer peripheral surface of the step cylindrical portion 9 d of the guide 9 and the inner peripheral surface of the lower storage hole 4 is filled. The inner peripheral surface of the lower storage hole 4 is crimped to the outer peripheral surface of the step cylindrical portion 9d.

Further, when the inner peripheral surface of the lower housing hole 4 is plastically deformed by further pressing the caulking pressing portion 9c, FIG.
As shown in FIG. 7, after all the gaps 20 between the step cylindrical portion 9d and the inner peripheral surface of the lower storage hole 4 are filled, the plastically deformed portion of the inner peripheral surface of the lower storage hole 4 becomes the lower storage hole. It starts flowing into the gap 17 between the inner peripheral surface of the hole 4 and the guide minimum diameter portion 9e. Since the gap 17 between the inner peripheral surface of the lower storage hole 4 and the guide minimum diameter portion 9e is formed relatively close to the caulking pressing portion 9c, plastic flow can be performed with a relatively small pushing force. Can be.

As described above, when the gap 20 between the stepped cylindrical portion 9d and the lower storage hole 4 is filled, the plastically deformed portion of the inner wall surface of the lower storage hole 4 becomes the lower storage hole 4 and the guide minimum diameter. Since it flows into the gap 17 between the step 9e and the step 9e, the close contact length between the step cylinder 9d and the lower storage hole 4 is limited by the length of the step cylinder 9d in the axial direction. For this reason, it is possible to suppress an increase in the guide pushing load, and to prevent the load from being applied more than the rigidity of the step cylindrical portion 9d (guide 9).

The relationship between the indentation load and the indentation stroke in the caulking step for ensuring the lower sealing property was examined for each of the prior art and this embodiment. FIG. 4 shows the results. In FIG. 4, the characteristics in the present embodiment are indicated by solid lines, and the characteristics in the prior art are indicated by broken lines.

As is clear from this figure, the present embodiment can suppress the indentation load in comparison with the characteristics of the prior art.

As described above, the gap 17 is formed between the outer peripheral surface of the guide minimum diameter portion 9e and the inner peripheral surface of the lower storage portion 3 to constitute the close contact length restricting means. It is possible to suppress an increase in the indentation load during the securing caulking step. Thus, the guide 9 can be prevented from being deformed into a drum shape, and the electromagnetic valve 1 can be controlled with high accuracy. If such an electromagnetic valve 1 is used for brake fluid pressure control of a vehicle, for example, ABS control or side slip prevention control, highly accurate brake fluid pressure control becomes possible.

The axial length of the stepped cylindrical portion 9 d is determined by taking into consideration the length of cavities (voids) and defects that may be formed in the housing 2 and the processing tolerance of the guide 9, and the entire outer circumference of the stepped cylindrical portion 9 d. The outer periphery of the stepped cylindrical portion 9d and the inner periphery of the lower storage hole 4 are set to be in close contact with each other in the periphery.

After assembling to the state shown in FIG. 2 in this manner, an assembling step for securing the upper sealing property is subsequently performed. FIG. 5 shows a state before and after an assembling step when ensuring the upper sealing property, and the description will be made based on this figure.

First, as shown in FIG. 5A, a cylindrical caulking punch 21 made of a hard material such as an iron alloy, which is an assembling jig, is aligned with the center axis of the guide, and is made of an aluminum alloy or the like. It is brought into contact with the upper surface of the configured housing 2.

Thereafter, the stroke is controlled by an electric press or the like, and the caulking punch 21 is pushed into the housing 2. Then, as shown in FIG.
The front end of the housing 2 plastically deforms the housing 2, and a part of the plastically deformed housing 2 fills the gap 22 between the guide maximum diameter portion 9 a and the housing and the space in the V-shaped groove 15. Thereby, an upper sealing property is obtained. further,
Since the V-shaped groove portion 15 is embedded by the housing 2, the pressure-resistant fixing strength can be secured.

The caulking step for ensuring the lower sealability described above is not a load control depending on variations in the hardness of the housing 2 or the like, but rather reliably fills a gap volume between the guide cylindrical portion and the housing to improve sealing quality. In order to secure it, the stroke amount of pushing the guide shoulder is managed and assembled. In this way, by performing the caulking process for ensuring the lower sealing property by controlling the stroke, the V-shaped groove 15
Since the distance to the upper side can be stabilized, a stable caulking quality can be obtained also in the caulking step for ensuring the upper sealing property.

Thereafter, the solenoid 5 and the yoke 5a are arranged outside the sleeve 7 and fixed, so that the solenoid valve 1 is assembled to the housing 2 as shown in FIG.

(Other Embodiments) In the above embodiment, the guide minimum diameter portion 9e is formed in a cylindrical shape with an almost uniform outer diameter, and the gap 1 between the guide minimum diameter portion 9e and the lower storage hole 4 is reduced.
Although the width of 7 is made substantially constant, it is not always necessary to adopt such a configuration.

For example, as shown in FIG. 6, the guide minimum diameter portion 9e may have a concave shape, and a gap 23 may be formed between the guide minimum diameter portion 9e and the housing 2. Also in this case, since the clearance portion is formed by the gap 23, depending on the position where the guide minimum diameter portion 9e is formed,
The length of close contact between the step cylindrical portion 9d and the inner peripheral surface of the lower storage hole 4 can be limited.

Further, even in a portion where the upper sealing property is secured, an escape portion into which the plastically deformed housing 2 flows can be formed, so that an increase in the pushing load by the caulking punch 21 can be suppressed.

For example, as shown in FIG. 7, the outer diameter of the guide maximum diameter portion 9a on the guide cylindrical portion 9b side is smaller than that of the V-shaped groove portion 15, that is, the guide maximum diameter portion 9a is formed in a stepped shape. A gap 24 may be formed between the radiused portion and the inner peripheral surface of the upper storage hole 3.

In this way, the gap 24 constitutes a clearance, and the length of the seal between the guide maximum diameter portion 9a and the upper storage hole 3 is determined according to the length from the V-shaped groove 15 to the gap 24. Can be restricted.

Accordingly, it is possible to reduce the maximum load of the caulking punch 21 at the time of securing the upper sealing property, to improve the working life of the caulking punch, and to reduce the deformation of the housing 2 around the solenoid valve 1 due to the caulking. Is also possible.

[Brief description of the drawings]

FIG. 1 is a diagram showing a cross-sectional structure of a solenoid valve 1 according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a cross-sectional structure of the solenoid valve 1 which has been subjected to an assembling step when ensuring a lower sealing property.

FIG. 3 is a view showing a state of caulking and fixing in the step shown in FIG. 2;

FIG. 4 is a view showing a relationship between a pushing load and a pushing stroke in a caulking step for ensuring lower sealing performance.

FIG. 5 is a diagram showing a cross-sectional structure of the solenoid valve 1 which has been subjected to an assembling step when securing an upper sealing system.

FIG. 6 is a diagram showing a cross-sectional structure of a solenoid valve 1 according to another embodiment.

FIG. 7 is a diagram showing a cross-sectional structure of a solenoid valve 1 according to another embodiment.

FIG. 8 is a view showing a cross-sectional structure of a conventional electromagnetic valve 1.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Solenoid valve, 2 ... Housing, 3 ... Upper storage hole, 4 ... Lower storage hole, 5 ... Solenoid, 6 ... Plunger, 9 ... Guide, 9a ... Guide maximum diameter part, 9b ... Guide cylindrical part, 9
c: pressing portion, 9d: step cylindrical portion, 9e: guide minimum diameter portion, 10: guide hollow portion, 15: V-shaped groove portion, 16: filter, 17: gap, 18: stepped portion, 19: guide shoulder surface, 20: gap, 23: gap, 24: gap.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Mikiya Kurita 1-1-1 Showa-cho, Kariya-shi, Aichi F-term in DENSO Corporation (Reference) 3D046 BB00 BB11 BB28 CC02 LL00 LL23 3H051 AA01 BB10 CC11 EE08 FF07 FF15 3H106 DA03 DA07 DA12 DA23 DB02 DB12 DB23 DB32 DC02 DC17 DD02 EE35 EE48 GB01 JJ03 JJ05 KK03 KK22

Claims (5)

[Claims] An electromagnetic valve (1) provided with a guide (9) having a substantially cylindrical shape is housed in a concave portion (3, 4) formed in a housing (2), and the housing is caulked and plastically deformed. Thereby, the inner wall surface of the concave portion and the outer peripheral surface of the guide are brought into close contact with each other, and the assembly structure of the electromagnetic valve is configured to be hydraulically sealed. An assembling structure for a solenoid valve, comprising: a contact length restricting means for restricting a contact length between an inner wall surface and an outer peripheral surface of the guide. 2. A recess formed in the housing has a larger diameter at the inlet side than at the bottom, an upper storage hole (3) at the inlet side of the recess, and a lower hole at the bottom side of the recess. A side storage hole (4) is formed, wherein the guide is a guide cylindrical portion (9b) stored in the upper storage hole, and a step cylinder stored in the lower storage hole and having a smaller diameter than the guide cylindrical portion. (9d), a step portion formed by the guide cylindrical portion and the step cylindrical portion, and a step portion (18) formed by the upper storage hole and the lower storage hole.
And a guide small-diameter portion (9e) obtained by reducing the diameter of the stepped cylindrical portion. The outer peripheral surface of the guide small-diameter portion and the inner periphery of the lower storage hole are formed. The assembly structure according to claim 1, wherein the contact length is limited by a gap (17, 23) formed between the solenoid valve and the surface. 3. The assembly structure according to claim 2, wherein the guide small diameter portion is a groove formed on an outer periphery of the stepped cylindrical portion. 4. The guide has a guide large-diameter portion (9a) housed in the upper storage hole, and a groove (15) is formed on an outer periphery of the guide large-diameter portion. At the same time, the guide large-diameter portion has a stepped portion on the bottom side of the concave portion relative to the groove to form a gap (24) between the guide large-diameter portion and the inner wall surface of the upper storage hole. The assembling structure of the solenoid valve according to claim 2 or 3, wherein 5. A brake device to which the solenoid valve assembly structure according to claim 1 is applied, wherein the solenoid valve is assembled to a housing of a brake fluid pressure control actuator.