JPH10119747A - Solenoid valve fitting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide solenoid valve fitting structure suppressing sudden pressure fluctuation in a hydraulic circuit to a minimum so as to be able to reduce the generation of noise and vibration. SOLUTION: A passage forming body 11 is provided with a valve body insert hole 14 to which a first passage 12 and a second passage 13 are opened. A solenoid valve 15 is provided with a valve body 18 having a first oil passage 16 and a second oil passage 17 respectively communicated with a first passage 12 and a second passage 13 of the passage forming body 11 and opened/closed by a plunger 23. The valve body insert hole 14 is to be a stepped hole large in diameter on the opening end side, while the valve body 18 of the solenoid valve 15 is to be of stepped shape small in diameter on the opening end side of the valve body 18. A fixed ring 25 with its inner periphery 25a fitted with play to a small diameter part 18a of the valve body 18 is fixed to a stepped part 14d of a large diameter part 14a of the valve insert hole 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a good structure for attaching an electromagnetic valve to a passage forming member, which is applied to an antilock brake device for controlling a vehicle brake fluid pressure.

[0002]

2. Description of the Related Art Conventionally, there is known an anti-lock brake device for controlling a brake fluid pressure of a vehicle in order to prevent a wheel from being locked during braking of the vehicle. As shown in FIG. 4, for example, this anti-lock brake device includes a master cylinder 2 that generates a brake hydraulic pressure in accordance with a treading force applied to a brake petal 1, and a hydraulic cylinder that guides the hydraulic pressure of the master cylinder 2 to a wheel cylinder 3. A passage 4, a normally-open type pressure-intensifying solenoid valve 5 provided in the middle of the main passage 4, and a return passage 7 for communicating the wheel cylinder 3 with the reservoir 6.
And a normally-closed pressure-reducing solenoid valve 8 provided in the middle of the return passage 7. In the figure, 9 is the reservoir 6
This is a pump mechanism for returning the brake fluid in the inside to the master cylinder 2.

If the wheels are likely to be locked during the braking operation by depressing the brake pedal 1, the pressure-increasing solenoid valve 5 is closed and the pressure-reducing solenoid valve 8 is opened.
The hydraulic pressure in the wheel cylinder 3 is caused to flow into the reservoir 6 through the return passage 7, and the hydraulic pressure in the wheel cylinder 3 is controlled to be reduced to avoid locking the wheels. More specifically, in this antilock control, pressure reduction, holding, and pressure increase of the brake fluid pressure are repeated in order to obtain an optimal braking state. Therefore, the opening and closing operations of the respective solenoid valves 5 and 8 are repeated. That is, when the brake fluid pressure is reduced, the pressure-intensifying electromagnetic valve 5 is closed and the pressure-reducing electromagnetic valve 8 is opened. During holding, both the pressure increasing solenoid valve 5 and the pressure reducing solenoid valve 8 are closed. When the pressure is increased, the pressure-increasing electromagnetic valve 5 is opened and the pressure-reducing electromagnetic valve 8 is closed.

At this moment, from the state where both the pressure-increasing-side electromagnetic valve 5 and the pressure-reducing-side electromagnetic valve 8 are closed (the holding state), when the pressure-increasing-side electromagnetic valve 5 is opened to increase the pressure, the pressure-increasing-side electromagnetic valve 5 The high-pressure main passage 4 upstream of the valve 5 (master cylinder 2 side) communicates with the low-pressure main passage 4 downstream of the pressure-increase solenoid valve 5 (wheel cylinder 3 side). become. Therefore, a sharp pressure drop occurs in the main passage 4 upstream of the pressure-intensifying solenoid valve 5 (on the side of the master cylinder 2), and in the main passage 4 downstream of the pressure-intensifying solenoid valve 5 (on the wheel cylinder side). There is a possibility that a surge pressure is generated.

A conventional solenoid valve is mounted on a passage forming body having a main passage for guiding the hydraulic pressure of a master cylinder to a wheel cylinder, as shown in, for example, Japanese Patent Application Laid-Open No. 58-180550. . That is, the passage forming body is provided with a valve body insertion hole that opens a first passage communicating with the master cylinder and a second passage communicating with the wheel cylinder, while the solenoid valve has the first passage and the first passage of the passage forming body. A valve body is provided which has a first oil passage and a second oil passage which are respectively communicated with the two passages and are opened and closed by a plunger, and the valve body is mounted by being inserted and fixed in a valve body insertion hole of the passage forming body. . Specifically, the valve body is mounted so as not to move in the axial direction by caulking the periphery of the opening of the valve body insertion hole.

[0006]

In the above-mentioned conventional mounting structure, the valve body of the solenoid valve is crimped around the opening edge of the valve body insertion hole, so that it is immovable in the axial direction, so-called rigid. Installed. For this reason,
When a surge pressure is generated in the main passage communicating the master cylinder and the wheel cylinder, a sudden pressure change in the hydraulic circuit may cause abnormal noise or vibration.

The present invention has been devised in view of such a conventional situation, and it is possible to suppress a rapid pressure fluctuation in a hydraulic circuit as much as possible and to reduce the generation of abnormal noise and vibration. An object of the present invention is to provide a possible solenoid valve mounting structure.

[0008]

SUMMARY OF THE INVENTION In view of the above, the invention according to claim 1 is attached to a passage forming body having a first passage and a second passage, and communicates and shuts off the first passage and the second passage. A valve body insertion hole for opening a first passage and a second passage in the passage forming body, wherein the solenoid valve has a first hole of the passage forming body.
A valve body having a first oil passage and a second oil passage which communicate with the passage and the second passage, respectively, and are opened and closed by a plunger; and the valve body is inserted into a valve body insertion hole of the passage forming body. In the valve mounting structure, the valve body insertion hole has a stepped shape with a large diameter at the opening end side, and the valve body of the solenoid valve has a stepped shape with a small diameter at the opening end side of the valve body insertion hole. A fixing ring whose inner periphery is loosely fitted to the small diameter portion of the valve body is fixed to the step portion of the large diameter portion of the body insertion hole.

According to a second aspect of the present invention, there is provided an electromagnetic valve mounting structure which is attached to a passage forming body having a first passage and a second passage, and controls communication and shutoff between the first passage and the second passage. And a first passage and a second passage in the passage forming body.
A first oil passage and a second oil passage which communicate with the first passage and the second passage of the passage forming body, respectively, and are opened and closed by a plunger, are provided in the solenoid valve while the valve body insertion hole is provided for opening the passage. In the mounting structure of the solenoid valve, wherein the valve body is inserted into the valve body insertion hole of the passage forming body, the valve body insertion hole has a stepped shape having a large diameter at the open end,
The valve body of the solenoid valve has a stepped shape with a small diameter at the opening end side of the valve body insertion hole, and the inner periphery is loosely fitted to the step portion of the large diameter portion of the valve body insertion hole, and the inner periphery is loosely fitted to the small diameter portion of the valve body. The ring is fixed, and an elastic member is interposed between the fixing ring and the step of the small diameter portion of the valve body.

According to a third aspect of the present invention, there is provided the valve according to the first or second aspect of the invention, wherein the fixing ring is caulked at the periphery of the opening end of the valve body insertion hole. It is configured to be fixed to the large diameter step of the body insertion hole.

Further, in the invention according to claim 4, in the structure of the invention according to claim 2, the elastic member is constituted by a metal wave washer.

Here, the fixing ring is fixed to the valve body insertion hole with its inner periphery loosely fitted to the small diameter portion of the valve body, so that the step portion of the small diameter portion of the valve body comes into contact with the fixing ring. This prevents the removal from the inside of the valve body insertion hole, but is not directly fixed in the valve body insertion hole. Therefore, the valve body can slightly move in the valve body insertion hole in the axial direction. For this reason, when a surge pressure is generated, the valve body slightly moves in the axial direction, thereby suppressing a sudden pressure fluctuation in the hydraulic circuit. Thereby, generation of abnormal noise and vibration due to pressure fluctuation can be reduced.

[0013] Therefore, a mounting structure of the solenoid valve which can suppress a sudden pressure fluctuation in the hydraulic circuit as much as possible and reduce the generation of abnormal noise and vibration can be obtained.

According to the second aspect of the present invention, the elastic member is not limited to a metal wave washer, but may be an O-ring made of a rubber material or a synthetic resin material. In order to reduce the number of members, a member having the most preferable elastic characteristics is selected.

According to such a configuration, the surge pressure is generated by the valve body of the solenoid valve being attached to the passage forming body with a degree of freedom in the axial direction within a range of elasticity of the elastic member. In such a case, the valve body slightly moves in the axial direction in the valve body insertion hole, and suppresses a sudden pressure fluctuation in the hydraulic circuit. Thereby, generation of abnormal noise and vibration due to pressure fluctuation can be reduced.

Therefore, a mounting structure of the solenoid valve which can suppress a sudden pressure fluctuation in the hydraulic circuit as much as possible and reduce the generation of abnormal noise and vibration can be obtained.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as embodiments applied to a pressure-increasing solenoid valve of an antilock brake device.

FIG. 1 is a sectional view of a mounting structure of a solenoid valve according to an embodiment of the present invention. In the figure, 11 is a passage forming body, 12 is a first passage formed in the passage forming body 11,
Reference numeral 13 denotes a second passage. The first passage 12 communicates with a master cylinder (not shown), and the second passage 13 communicates with a wheel cylinder (not shown).

The passage forming body 11 has a valve body insertion hole 14 in which the first passage 12 and the second passage 13 are opened. The valve body insertion hole 14 is formed in a stepped shape with a large diameter on the open end side, and is gradually reduced in diameter from a large diameter part 14a on the open end side to form a medium diameter part 14b and a small diameter part 14c. .

Reference numeral 15 denotes an electromagnetic valve. The electromagnetic valve 15 is a valve in which a first oil passage 16 and a second oil passage 17 communicating with the first passage 12 and the second passage 13 of the passage forming body 11 are formed. A body 18, an armature 21 disposed in a cylinder 19 made of a non-magnetic material provided on one end side of the valve body 18 and driven by an electromagnetic coil 20; Slides in the hole 22, and the first end 23a
A plunger 23 that opens and closes communication between the oil passage 16 and the second oil passage 17 is configured as a main element.

The valve body 18 is formed in a stepped shape. A small diameter portion 18a is formed facing the large diameter portion 14a of the valve body insertion hole 14.
A large diameter portion 18b is formed facing the middle diameter portion 14b. A cup seal 24 is provided at the tip of the valve body 18, and the cup seal 24 is inserted into the small diameter portion 14c of the valve body insertion hole 14, and the large diameter portion 18b is inserted into the medium diameter portion 14b. By being inserted, the valve body 18 is inserted into the valve body insertion hole 14 as a whole.

Reference numeral 25 denotes an annularly formed fixing ring.
The inner peripheral side 25a of the fixing ring 25 has a valve body 1
8 is loosely fitted to the small diameter portion 18a with a slight gap, and the stepped portion 14 of the large diameter portion 14a of the valve body insertion hole 14.
d is fixed by caulking the open end of the valve body insertion hole 14.

Here, the fixing ring 25 has an inner periphery 25a.
Is fixed to the valve body insertion hole 14 in a state where it is loosely fitted to the small diameter portion 18a of the valve body 18, so that the step portion 18c of the small diameter portion 18a
5 is prevented from being pulled out of the valve body insertion hole 14, but is not directly fixed in the valve body insertion hole 14. Therefore, the valve body 18 is slightly inserted into the valve body insertion hole 14.
It is possible to move inside in the axial direction.

The plunger 23 is constantly urged upward by a compression spring 30 which is in contact with an orifice plug 29 inserted and fixed in the first oil passage 16, and in a normal state, the first oil passage 16 and the second oil passage The communication with the road 17 is open. On the other hand, when the electromagnetic coil 20 is excited and the armature 21 is driven to lower the plunger 23, the leading end 23a of the orifice plug 29 communicates with the communication hole 2 of the orifice plug 29.
9a can be closed, and the communication between the first oil passage 16 and the second oil passage 17 can be closed.

Reference numeral 31 denotes the first passage 12 and the first oil passage 1.
6, a filter disposed between the second passage 1 and the second passage 1.
The working liquid flowing between the first passage 16 and the second passage 17 is filtered by a filter arranged between the third passage 3 and the second oil passage 17. Reference numeral 33 denotes a seal ring for sealing between the valve body insertion hole 14 and the valve body 18.

In such a configuration, in a normal state, the plunger 23 is urged toward the armature 21 by the spring force of the compression spring 30, and as shown in FIG. Communication with the first passage 1
It is possible to guide the hydraulic pressure of the master cylinder guided from the second oil passage 16 to the first oil passage 16 to the wheel cylinder from the second oil passage 17 through the second passage 13.

If the hydraulic pressure of the wheel cylinder increases during the braking operation and the wheels may be locked, antilock control is started, and the electromagnetic coil 20 of the electromagnetic valve 15 is activated by a signal from a control device (not shown). Is excited to lower the armature 21 from the position shown in FIG. As a result, the plunger 23 moves downward against the spring force of the compression spring 30 and closes the communication hole 29a of the orifice plug 29 at its tip 23a, so that the first oil passage 16 and the second oil passage 16 are closed.
The communication with the oil passage 17 is cut off. As a result, the hydraulic pressure in the wheel cylinder is controlled to be reduced, and locking of the wheel is avoided.

At the time of the antilock control, the solenoid valve 1
First passage 12 on the upstream side (master cylinder side)
When there is a possibility that a surge pressure may be generated on the second passage 13 side downstream of the solenoid valve 15 (wheel cylinder side) as shown by a broken line A in FIG.
The valve body 18 slightly moves in the axial direction in the valve body insertion hole 14, and suppresses sudden pressure fluctuation in the hydraulic circuit as shown by the solid line B in FIG. As a result, the pressure fluctuation is suppressed to a small level, and the occurrence of abnormal noise and vibration due to the pressure fluctuation can be reduced.

Therefore, an electromagnetic valve mounting structure capable of minimizing sudden pressure fluctuations in the hydraulic circuit and reducing occurrence of abnormal noise and vibration can be obtained.

FIG. 2 is a drawing showing another embodiment of the present invention. This embodiment differs from the above-described embodiment in that an elastic member 34 made of a metal wave washer is interposed between the fixing ring 25 and the step 18c of the small diameter portion 18a of the valve body 18. It is. As a result, the valve body 18 is inserted into the valve body insertion hole 14.
Is movable in the axial direction within the range of elasticity of the elastic member 34.

According to such a configuration, at the time of the antilock control, a sharp pressure drop occurs on the first passage 12 side upstream of the electromagnetic valve 15 (master cylinder side), and the pressure downstream of the electromagnetic valve 15 (on the master cylinder side). Second passage 1 on the wheel cylinder side)
When there is a possibility that a surge pressure may be generated on the side 3, the valve body 18 is inserted into the elastic member 34 in the valve body insertion hole 14.
Slightly moves in the axial direction within the range of elasticity, and suppresses sudden pressure fluctuations in the hydraulic circuit. As a result, the pressure fluctuation is suppressed to a small level, and the occurrence of abnormal noise and vibration due to the pressure fluctuation can be reduced.

Therefore, even in this embodiment,
As described in the above-described embodiment, a mounting structure of an electromagnetic valve capable of suppressing a sudden pressure fluctuation in the hydraulic circuit as much as possible and reducing generation of abnormal noise and vibration can be obtained.

Although the embodiment of the present invention has been described with reference to the drawings, the specific configuration is not limited to this and can be changed without departing from the spirit of the invention. For example, the embodiment in which the fixing ring 25 is fixed by caulking the open end of the valve body insertion hole 14 has been described, but a nut is screwed and fixed to the open end of the valve body insertion hole 14. You may. Further, the present invention can be applied to a normally closed solenoid valve.

[0034]

As described above in detail, according to the present invention, it is possible to suppress the rapid pressure fluctuation in the hydraulic circuit as much as possible and to reduce the generation of abnormal noise and vibration. A mounting structure for the solenoid valve is obtained.

[Brief description of the drawings]

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

FIG. 2 is a sectional view of a mounting structure of a solenoid valve according to another embodiment of the present invention.

FIG. 3 is a diagram for explaining the energization of a solenoid valve and the accompanying fluctuation in hydraulic pressure in a hydraulic circuit.

FIG. 4 is an explanatory diagram showing an overall configuration of an anti-lock brake device.

[Explanation of symbols]

 Reference Signs List 11 passage forming body 12 first passage 13 second passage 14 valve body insertion hole 14a large diameter portion 14d step 15 solenoid valve 16 first oil passage 17 second oil passage 18 valve body 18a small diameter portion 18c step 23 plunger 25 fixed Ring 34 elastic member

Claims (4)

[Claims] 1. A mounting structure for an electromagnetic valve which is attached to a passage forming body having a first passage and a second passage, and controls communication and shutoff between the first passage and the second passage. The valve body is provided with a valve body insertion hole for opening the first passage and the second passage, while the solenoid valve communicates with the first passage and the second passage of the passage forming body, and is opened and closed by a plunger. A valve body having an oil passage and a second oil passage is provided, and the valve body is inserted into a valve body insertion hole of the passage forming body. On the other hand, the valve body of the solenoid valve has a stepped shape with a small diameter at the opening end side of the valve body insertion hole, and the inner periphery of the valve body has a stepped portion with a large diameter portion of the valve body insertion hole. Small diameter A mounting structure for an electromagnetic valve, wherein a fixing ring loosely fitted to a portion is fixed. 2. A mounting structure for an electromagnetic valve which is attached to a passage forming body having a first passage and a second passage, and controls communication and shutoff between the first passage and the second passage. The valve body is provided with a valve body insertion hole for opening the first passage and the second passage, while the solenoid valve communicates with the first passage and the second passage of the passage forming body, and is opened and closed by a plunger. A valve body having an oil passage and a second oil passage is provided, and the valve body is inserted into a valve body insertion hole of the passage forming body. On the other hand, the valve body of the solenoid valve has a stepped shape with a small diameter at the opening end side of the valve body insertion hole, and the inner periphery of the valve body has a stepped portion with a large diameter portion of the valve body insertion hole. Small diameter A mounting structure for an electromagnetic valve, comprising: a fixing ring loosely fitted to a fixing portion; and an elastic member interposed between the fixing ring and a step portion of a small diameter portion of the valve body. 3. The fixing ring according to claim 1, wherein the fixing ring is fixed to a step portion of a large diameter portion of the valve body insertion hole by caulking a peripheral edge of an opening end of the valve body insertion hole. 3. A mounting structure for a solenoid valve according to claim 1. 4. The mounting structure according to claim 2, wherein the elastic member is a metal wave washer.