JP2572589Y2 - 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, and more particularly to a solenoid valve suitable for use in an anti-lock brake device of an automobile.

[0002]

2. Description of the Related Art Conventionally, as this type of solenoid valve, for example, a solenoid valve described in Japanese Utility Model Laid-Open Publication No. 61-24353 is known.

[0003] Such a solenoid valve is a normally open solenoid valve incorporated in an anti-lock brake device of an automobile and provided in a brake fluid passage between a master cylinder and a wheel cylinder, and is provided upstream of the solenoid valve. Is provided with a fixed orifice for finely controlling the pressure increase of the wheel cylinder pressure, and a check valve formed separately from the fixed orifice is connected in parallel with a pipe.

This check valve prevents the flow of brake fluid from the master cylinder side to the wheel cylinder side,
In addition, by permitting the flow in the opposite direction, the wheel cylinder pressure is quickly released when the brake operation is released to improve the responsiveness.

[0005]

However, in the above-described conventional antilock brake device, a fixed orifice and a check valve which are formed separately from the solenoid valve are externally attached. It is necessary to provide fixed orifices and check valves by the number corresponding to the number of brake systems, increasing the number of parts, increasing the size of the coupling structure consisting of solenoid valves and check valves, and eventually increasing the size of the entire antilock brake device. There was a problem of inviting.

[0006] In addition, it is conceivable that the solenoid valve is incorporated in the solenoid valve itself. However, simply assembling the solenoid valve in parallel only increases the diameter of the solenoid valve, and is not a fundamental solution.

An object of the present invention is to solve such a conventional problem and to provide a solenoid valve which has the functions of an orifice and a check valve and is reduced in size.

[0008]

In order to achieve the above object, a solenoid valve according to a first embodiment of the present invention is formed on a valve seat member in a casing by a valve body driven in an axial direction by a solenoid. A solenoid valve that opens and closes the communication path in the axial direction, wherein the valve seat member is configured to be movable in the axial direction within the casing, and the valve seat member is urged toward the valve body and the movement is moved to a predetermined position. When the valve seat member is at the predetermined position in the open state of the communication passage, an orifice is formed between the valve body and the valve seat member, and a stopper member for the valve seat member is provided. The orifice is configured to be released when the valve seat member moves from a predetermined position due to a pressure difference between front and rear. And butterflies.

A solenoid valve according to a second embodiment of the present invention is a solenoid valve capable of opening and closing the axial communication passage formed in a valve seat member in a casing by a valve body driven in the axial direction by a solenoid. In the above, the valve seat member is fixed in the casing, and an orifice is provided in a valve body biased by a spring disposed in the communication passage toward a valve seat provided at an end of the communication passage of the valve seat member. In the demagnetized state of the solenoid, the communication path is kept open via the orifice, and when the solenoid is excited, the orifice of the valve body is closed to maintain the pressure, and the communication path is opened. In this state, the valve body is retracted from the valve seat against the elastic force of the spring due to the pressure difference between the front and rear of the valve seat member. Characterized in that as capable eliminate the pressure difference I.

[0010]

According to the first aspect of the present invention, when the solenoid is not energized and is in the valve open state, the valve seat member is urged and is at a predetermined position regulated by the stopper member. An orifice is formed between the sheet member. When the valve seat member moves from a predetermined position due to a pressure difference between the front and rear of the valve seat member in the valve open state, the orifice is released.

According to the second aspect of the present invention, when the solenoid is not energized and is in the open state, it is communicated through the orifice of the valve body itself. If there is a pressure difference before and after the pressure difference, the valve body retreats from the valve seat, thereby eliminating the pressure difference.

Since the solenoid valve of the present invention is configured so as to have a function as an orifice and a check valve in connection with the valve element, the solenoid valve itself can be reduced in size.

As a result, it is possible to reduce the size of the entire application device of the solenoid valve, such as an anti-lock brake device of an automobile.

[0014]

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

FIG. 1 shows an embodiment of the first aspect of the present invention. Here, the solenoid valve 1 of this embodiment is used.
Is an example of a configuration that is incorporated in an anti-lock brake device of an automobile.

In FIG. 1, reference numeral 2 denotes a casing of a solenoid valve 1, and the casing 2 comprises upper and lower casing members 3 and 4 formed of a magnetic material in a cylindrical shape.
And an annular body 5 formed of a nonmagnetic material in an annular shape and located between the casing members 3 and 4.

The upper and lower portions in the lower casing member 4 are a small-diameter hole portion 4A and a large-diameter hole portion 4B, and a lower bearing 6 fitted to a step between them is provided. A valve rod 8 is supported between the upper casing member 3 and an upper bearing 7 fitted inside the upper casing member 3 so as to be vertically movable.

At the center of the lower bearing 6, there is formed a communication passage 6A communicating with the valve rod 8 in the axial direction. The communication passage 6A is formed in an inner peripheral wall of a center hole of the lower bearing 6 through which the valve rod 8 penetrates. For example, a plurality of vertically extending grooves are provided in the inner peripheral wall of the hole, and May be formed by forming a cross section of the gear into a gear shape. A communication passage 7A is formed in the inner peripheral wall of the center hole of the upper bearing 7 through which the valve rod 8 penetrates by a groove extending in the vertical direction.

A spherical valve body 9 is attached to the lower end of the valve rod 8, and an armature 10 that can move up and down inside the upper casing member 3 is fixed to an upper portion of the valve rod 8. A communication passage 10 </ b> A that communicates in the up-down direction is formed at the center of the amateur 10. A compression spring 11 for urging the armature 10 upward in the figure is provided between the armature 10 and the lower bearing 6.
Further, a solenoid (electromagnetic coil) 12 for magnetically attracting and moving the armature 10 downward in the drawing is provided on the outer peripheral portion of the casing 2.

The large diameter hole 4 of the lower casing member 4
A valve seat member 13 is fitted in B so as to be movable in the axial direction. The cross section of the valve seat member 13 is formed in a substantially convex shape, and the valve seat member 13 is biased toward the valve body 9 by a spring 15 one end of which is supported by a spring retainer 14 press-fitted and fixed to the lower casing member 4. However, the annular lower end 6B of the lower bearing 6 is formed so as to be extended, and functions as a stopper for restricting the movement to a predetermined position by contacting the shoulder 13A of the valve seat member 13, and seals together with the shoulder 13A. Functions as a unit.

Further, a communication hole 13B is formed in the center of the valve seat member 13 in the axial direction, and a valve seat 13C on which a spherical valve body 9 is seated is formed near the upper end edge of the communication hole 13B. ing. In the present embodiment, a cylindrical portion 13D having an inner diameter slightly larger than the outer diameter of the spherical valve element 9 is formed outside the valve seat 13C.

As shown in FIG. 1, the cylindrical portion 13D
The valve seat member 13 has a shoulder 13A whose lower side bearing 6A
In a state where the solenoid 12 is de-energized and the valve 9 is urged upward, the outer circumference of the valve 9 and the cylindrical portion 13D are An orifice is formed with the inner periphery. Further, as will be described later, the valve seat member 1 is located at the position shown in FIG.
When the position 3 is located, the height of the cylindrical portion 13D is set so that a flow path having a sufficient sectional area can be secured.

Thus, the solenoid valve 1 configured as described above is incorporated in an anti-lock brake device,
In the brake fluid passage, the lower side of the drawing, that is, the valve seat member 13 side is connected to the master cylinder side by piping, and the upper side of the drawing is connected to the wheel cylinder side by piping.

Next, the operation will be described.

First, when the solenoid 12 is not energized,
As shown in FIG. 1, the valve body 9 is separated from the valve seat 13C, and the brake fluid passage is open. Therefore, the brake fluid flows through the brake fluid passage,
The pressure in the master cylinder is introduced into the wheel cylinder, and a normal braking operation or a pressure increasing operation in antilock control is performed. that time,
The valve seat member 13 is regulated and held at a predetermined position by the high pressure on the master cylinder side and the urging force of the spring 15, and an orifice is formed by the valve body 9 and the cylindrical portion 13D. Therefore, a rapid pressure increase of the wheel cylinder is suppressed. On the other hand, the valve seat member 13 functions as a valve body of the check valve,
The leakage of the brake fluid through the outer peripheral portion of the valve seat member 13 is determined by the shoulder portion 13A and the annular lower end portion 6B of the lower bearing 6.
It is prevented by the sealing function by contact with

Next, when the device operates to maintain the wheel pressure in the antilock control, the solenoid 12
Is energized, the valve body 9 moves downward by suction together with the armature 10 and the valve rod 8, and as shown in FIG. 2, the valve body 9 presses against the valve seat 13C to close the communication hole 13B, that is, the brake fluid passage.

At this time, the pressure from the master cylinder acts on the valve seat member 13 from below, and the sealing function works as described above.

By the way, when the braking operation is released,
The master cylinder pressure drops and the solenoid 1
2 is stopped, and the valve body 9 is separated from the valve seat 13C. At this time, the pressure on the master cylinder side
Since the pressure on the wheel cylinder side is high, the pressure difference causes the valve seat member 13 to move downward against the urging force of the spring 15. Then, the cylindrical portion 13D, which constituted the orifice together with the valve element 9, comes off the position of the valve element 9, and the orifice is no longer formed. As a result, a flow path having a large cross-sectional area is secured, and the brake fluid pressure on the wheel cylinder side can be quickly released to the master cylinder side.

FIG. 4 shows another embodiment according to the second aspect of the present invention. Parts having the same functions or the same functions as those described with reference to FIGS. 1 to 3 are denoted by the same reference numerals unless otherwise specified, and detailed description is omitted.

Here, reference numeral 21 denotes a solenoid valve according to the present embodiment. In the solenoid valve 21 of the present embodiment, the lower bearing 6, the upper bearing 7, and the armature 10
And the communication passages 6A, 7A and 1 provided respectively.
Although the shape and the like of 0A are different, there is no functional difference from the first embodiment described above. Reference numeral 22 denotes a valve seat member according to the present embodiment. The valve seat member 22 according to the present embodiment has an inner cylindrical portion having a step formed in a small-diameter passage 22A and a large-diameter passage 22B. Is formed on the valve seat 22C.

The outer periphery of the valve seat member 22 of this embodiment is press-fitted and fixed in a large-diameter hole 4B of the casing 2, and an orifice valve having an orifice 23A in the large-diameter passage 22B of the valve seat member 22. The body 23 is slidably fitted and biased toward the valve seat 22C by the spring force of the spring 15. Reference numeral 24 denotes a spring retainer press-fitted and fixed in the large-diameter passage 22B.

Next, the structure of the orifice valve body 23 will be described in more detail with reference to FIG. Orifice valve 2
3, a flexible seating member 25 is press-fitted in the upper part of the cone, and orifices 25A and 23A communicating with the seating member 25 and the orifice valve body 23 are drilled. Has been established. In addition, a large-diameter passage 22 is provided at the four circumferential portions of the orifice valve body 23.
A groove 23B parallel to B is formed.

Next, the operation of the solenoid valve 21 configured as described above will be described. In FIG. 4, the side A is the master cylinder side (not shown) and the side B is the wheel cylinder side. Now, when the brake pedal is depressed on the master cylinder side, the hydraulic pressure of the pressurized hydraulic fluid and the spring 15 The orifice valve body 23 is kept pressed against the valve seat 22C of the valve seat member 22 by the force. In this case, since the solenoid 12 is not excited in the solenoid valve 21 itself, the valve rod 8
As shown in this figure, the orifice 23A in the orifice valve element 23 is kept open together with the orifice 25A, so that the hydraulic fluid passes through these orifices 23A and 25A. Is guided from the A side to the B side, and the pressure is increased to the wheel cylinder side. Further, such pressure increase is performed through the orifice, thereby suppressing a rapid pressure increase.

Next, when the hydraulic pressure is required to be maintained in the wheel cylinder as the antilock control, the solenoid 12 is energized to excite the armature 10 as shown in FIG.
Is urged downward together with the valve rod 8, and the valve portion 8A at the tip of the valve rod 8 comes into contact with the seating member 25 and the orifice 25A
Close. As a result, the flow of the hydraulic fluid stops, and the pressure is maintained. In this case, the spring 1
5 is set stronger than the flexibility of the seat member 25, the seat member 25 bends due to the contact pressure described above. However, the orifice valve body 23 itself cannot be pushed down from the valve seat 22C. Without closing the valve.

When the braking operation is released,
When the hydraulic fluid pressure on the master cylinder side, that is, on the A side decreases, the energization to the solenoid 12 is stopped and demagnetized, so that the valve rod 8 and the armature 10 remain at the positions shown in FIG. As shown in FIG. 7, the hydraulic fluid pressure on the side B, that is, the hydraulic fluid on the side B becomes higher.
5 large diameter passage 2 of the valve seat member 22 against the spring force of FIG.
It is pushed down along 2B. Then, along with the orifices 25A, 23A, the brake hydraulic fluid is moved from the B side to the A side through a gap 26 formed between the valve seat 22C and the outer peripheral portion of the seating member 25 and a groove 23B formed in the four peripheral portions of the orifice valve body 23. And the hydraulic pressure on the wheel cylinder side is rapidly released.

[0036]

As described above, according to the solenoid valve of the present invention, since it is configured so that it can have both functions as an orifice and a check valve in relation to the valve element, it is necessary to separately provide them. Therefore, the size of the solenoid valve itself can be reduced.

As a result, it is possible to reduce the size of the entire application device of the solenoid valve such as an anti-lock brake device of an automobile.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an example of a first embodiment of the present invention in a state of increasing pressure.

FIG. 2 is a partially enlarged view of FIG. 1, showing a state of holding.

FIG. 3 is a partially enlarged view of FIG. 1, showing a state in which a brake is released.

FIG. 4 is a longitudinal sectional view showing another embodiment according to the second aspect of the present invention in a state where pressure is increased.

5 is an enlarged view showing an orifice valve element shown in a part C of FIG. 4 as a sectional view (A) and a top view (B).

FIG. 6 is a longitudinal sectional view showing the embodiment shown in FIG. 4 in a state where the hydraulic pressure is maintained.

7 is a longitudinal sectional view showing the embodiment shown in FIG. 4 in a state where a brake is released.

DESCRIPTION OF SYMBOLS 1 , 21 solenoid valve 2 casing 6 bearing 6A communication passage 6B annular lower end (stopper member) 8 valve rod 8A valve portion 9 valve body 12 solenoid 13, 22 valve seat member 13A shoulder portion 13D cylindrical portion 15 Spring 22A Small diameter passage 22B Large diameter passage 22C Valve seat 23 Orifice valve element 23A, 25A Orifice 23B Groove

Continuation of the front page (56) References JP-A-3-41278 (JP, A) JP-A-3-134385 (JP, A) JP-A-3-125959 (JP, U) JP-A-61-70667 (JP) , U) Jikgyo 4-11896 (JP, Y2) (58) Fields investigated (Int. Cl. ⁶ , DB name) F16K 31/06 305 F16K 31/06 385

Claims (2)

(57) [Scope of request for utility model registration] 1. A solenoid valve which opens and closes an axial communication passage formed in a valve seat member in a casing by a valve element driven in an axial direction by a solenoid, wherein the valve seat member is connected to an axial line in the casing. A stopper member for urging the valve seat member toward the valve body and restricting the movement thereof to a predetermined position, wherein the valve seat member is at the predetermined position when the communication path is open. At one time, an orifice is formed between the valve body and the valve seat member, and the orifice is released when the valve seat member moves from a predetermined position due to a pressure difference before and after the valve seat member. A solenoid valve, characterized in that: 2. A solenoid valve capable of opening and closing said axial communication passage formed in a valve seat member in a casing by a valve body driven in an axial direction by a solenoid, wherein said valve seat member is fixed in said casing. An orifice is provided on a valve body biased by a spring disposed in the communication passage toward a valve seat provided at an end of the communication passage of the valve seat member, and the solenoid is demagnetized through the orifice in a demagnetized state. The communication path is maintained in an open state, pressure is maintained by closing an orifice of the valve body in an energized state of the solenoid, and a pressure difference between front and rear of the valve seat member in an open state of the communication path. The pressure difference can be eliminated by retracting the valve body from the valve seat against the elastic force of the spring. Solenoid valve according to claim.