JPH0519758U - Solenoid valve - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a solenoid valve that has the functions of an orifice and a check valve and can be downsized. A valve seat member 13 fitted in a casing 2 so as to be movable in an axial direction is provided with a tubular portion 13D having an inner diameter larger than that of the valve body 9, and the valve body 9 and the tubular portion 13D form an orifice. did. Then, the valve seat member 13 is moved downward by the pressure difference acting before and after the valve seat member 13, and the orifice is released.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a solenoid valve, and more particularly to a solenoid valve suitable for use in an antilock brake device for automobiles.

[0002]

[Prior Art]

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

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. Has a fixed orifice in order to precisely control the increase of the wheel cylinder pressure, and a check valve that is separate from the fixed orifice is connected in parallel.

This check valve blocks the flow of the brake fluid from the master cylinder side to the wheel cylinder side and allows the flow in the opposite direction, so that the wheel cylinder pressure is quickly released when the brake operation is released. This is to improve responsiveness.

[0005]

[Problems to be solved by the device]

 However, in the above-mentioned conventional anti-lock brake device, since the fixed orifice and the check valve, which are configured separately from the solenoid valve, are externally attached, only the number corresponding to the number of brake systems is increased. Since it was necessary to provide a fixed orifice and a check valve, the number of parts increased, the coupling structure consisting of a solenoid valve and a check valve became large, and eventually the antilock brake device became large.

Further, although it may be considered that the solenoid valve is incorporated into the solenoid valve itself, merely incorporating the solenoid valve in parallel causes an increase in the diameter of the solenoid valve and cannot be said to be a fundamental solution.

An object of the present invention is to solve the conventional problems described above, and to provide a solenoid valve that has the functions of an orifice and a check valve and can be downsized.

[0008]

[Means for Solving the Problems]

 To achieve this object, the solenoid valve according to the first aspect of the present invention is a solenoid valve that is axially driven by a solenoid to form an axial communication passage formed in a valve sheet member in a casing. In a solenoid valve that opens and closes a valve, the valve seat member is configured to be movable in the axial direction in the casing, and the stopper member biases the valve seat member toward the valve body and restricts the movement thereof to a predetermined position. And an orifice is formed between the valve body and the valve seat member when the valve seat member is at the predetermined position with the communication passage open, and a pressure difference between the valve seat member front and rear is formed. Is characterized in that the orifice is released when the valve seat member moves from a predetermined position.

In the solenoid valve according to the second aspect of the present invention, the axial communicating passage formed in the valve seat member in the casing can be opened and closed by the valve element that is axially driven by the solenoid. In a solenoid valve, the valve seat member is fixed in the casing, and an orifice is formed in a valve element 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. Is provided, the communication passage is maintained in an open state via the orifice in the demagnetized state of the solenoid, and the orifice of the valve body is closed in the excited state of the solenoid so that pressure is maintained, and the communication passage is formed. In the open state, the valve body is retracted from the valve seat against the elastic force of the spring due to the pressure difference across the valve seat member. By so doing, it is possible to eliminate the pressure difference.

[0010]

[Action]

 According to the first aspect of the present invention, when the solenoid is not excited and is in the valve open state, the valve seat member is biased and is in the predetermined position regulated by the stopper member. An orifice is formed between the sheet member and the sheet member. Further, when the valve seat member moves from the predetermined position due to the pressure difference across the valve seat member in this valve open state, the above-mentioned orifice is released.

Further, according to the second aspect of the present invention, when the solenoid is not excited and is in a valve open state, the solenoid is communicated through the orifice of the valve body itself, and in this valve open state, the valve seat member is in communication. If there is a pressure difference before and after, the valve body retracts from the valve seat and the pressure difference is eliminated.

Since the solenoid valve of the present invention is configured to have a function as an orifice or a check valve in association with the valve body, the solenoid valve itself can be downsized.

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

[0014]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment according to the first mode of the present invention. Here, the solenoid valve 1 of the present embodiment is an example of a structure to be incorporated in an antilock brake device of an automobile.

In FIG. 1, reference numeral 2 denotes a casing of a solenoid valve 1, and the casing 2 has upper and lower casing members 3 and 4 formed in a cylindrical shape by a magnetic material, and an annular shape formed by a non-magnetic material. It has a coupling structure with an annular body 5 located between the casing members 3 and 4.

Upper and lower parts of 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 in a step portion between them. A valve rod 8 is supported between the upper casing 7 and an upper bearing 7 fitted inside the upper casing member 3 so as to be movable up and down.

A communication passage 6 A communicating with the valve rod 8 in the axial direction is formed in the center of the lower bearing 6. The communication passage 6A is formed in an inner peripheral wall of a central 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. You may form by making the cross section of the hole into a gear shape. A communication passage 7A is formed by a groove extending in the vertical direction on the inner peripheral wall of the central hole of the upper bearing 7 through which the valve rod 8 penetrates.

A spherical valve element 9 is attached to the lower end of the valve rod 8, and an armature 10 that is vertically movable inside the upper casing member 3 is fixed to the upper portion of the valve rod 8. .. A communication passage 10A that communicates in the vertical direction is formed at the center of the amateur 10. A compression spring 11 that urges the armature 10 upward in the drawing is interposed between the armature 10 and the lower bearing 6, and the armature 10 is provided on the outer peripheral portion of the casing 2. A solenoid (electromagnetic coil) 12 for magnetically attracting and moving downward is provided.

A valve seat member 13 is fitted in the large diameter hole portion 4B of the lower casing member 4 so as to be movable in the axial direction. The valve seat member 13 has a substantially convex cross section, and is biased toward the valve body 9 by a spring 15 having one end supported by a spring retainer 14 press-fitted and fixed to the lower casing member 4. There is. However, the annular lower end portion 6B of the lower bearing 6 described above is extended and functions as a stopper that restricts its movement to a predetermined position by contacting the shoulder portion 13A of the valve seat member 13, and at the same time, the shoulder portion 13A. It also functions as a seal.

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 the spherical valve body 9 is seated is formed near the upper end edge of the communication hole 13B. Has been done. In this embodiment, a tubular portion 13D having an inner diameter slightly larger than the outer diameter of the spherical valve body 9 is formed outside the valve sheet 13C.

As shown in FIG. 1, the tubular portion 13D is located at a position where the valve seat member 13 is regulated to a predetermined position where the shoulder portion 13A of the valve seat member 13 abuts on the annular lower end portion 6B of the lower bearing 6. Further, the solenoid 12 is set so that the outer circumference of the valve body 9 and the inner circumference of the tubular portion 13D form an orifice in a state where the solenoid 9 is not excited and the valve body 9 is biased upward. Further, as will be described later, the height of the cylindrical portion 13D is set so that a flow passage having a sufficient cross-sectional area can be secured when the valve seat member 13 is located at the position shown in FIG.

The solenoid valve 1 thus constructed is incorporated in the anti-lock brake device, and the lower side in the drawing, that is, the valve seat member 13 side is pipe-connected to the master cylinder side in the brake fluid passage. The upper side of the drawing is connected to the wheel cylinder side by piping for use.

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 the normal brake operation or the pressure increasing operation in the antilock control is performed. At 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 the valve body 9 and the tubular portion 13D form an orifice. Has been done. Therefore, the 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, and the leakage of the brake fluid through the outer peripheral portion of the valve sheet member 13 is prevented from occurring in the shoulder portion 13A and the lower annular end portion 6B of the lower bearing 6. It is prevented by the sealing function by contact with.

Next, when the device is operated to hold the wheel pressure in the antilock control, the solenoid 12 is energized and the valve body 9 is sucked down together with the armature 10 and the valve rod 8 and is shown in FIG. As described above, the valve body 9 presses 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 the lower side, and the sealing function works as described above.

By the way, when the brake operation is released, the pressure of the master cylinder is reduced, and at the same time, the energization of the solenoid 12 is stopped, and the valve body 9 separates from the valve seat 13C. At this time, since the pressure on the wheel cylinder side is higher than the pressure on the master cylinder side, the pressure difference causes the valve seat member 13 to move downward against the biasing force of the spring 15. Then, the tubular portion 13D, which constitutes the orifice together with the valve body 9, is displaced from the position of the valve body 9, and the orifice is no longer constituted. As a result, a flow passage 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 mode of the present invention. It should be noted that the same portions or those having the same function as those described with reference to FIGS. 1 to 3 below are given the same reference numerals unless otherwise specified and detailed description thereof will be omitted.

Here, 21 is 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 10A respectively provided in them are different in shape, but functionally. There is no 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 in this embodiment has a stepped portion of the inner cylinder portion of the small diameter passage 22A and the large diameter passage 22B. Is formed on the valve seat 22C.

Further, the valve seat member 22 of this example has its outer peripheral portion press-fitted and fixed in the large diameter hole portion 4 B of the casing 2, and further has an orifice 23 A in the large diameter passage 22 B of the valve seat member 22. The orifice valve body 23 is slidably fitted and is biased toward the valve seat 22C by the spring force of the spring 15. Reference numeral 24 is a spring retainer that is press-fitted and fixed in the large diameter passage 22B.

Next, the configuration of the orifice valve body 23 will be described in more detail with reference to FIG. As shown in this figure, the orifice valve body 23 is formed in a substantially cone shape, and a flexible seating member 25 is press-fitted on the upper portion thereof, and the orifice 25A communicating with the seating member 25 and the orifice valve body 23 is formed. And 23A are drilled. Further, a groove 23B 1 which is parallel to the large diameter passage 22B is formed on the four peripheral portions of the orifice valve body 23.

Next, the operation of the solenoid valve 21 thus configured will be described. In FIG. 4, the A side is the master cylinder side (not shown) and the B side 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 spring force of. In this case, since the solenoid 12 is not excited by the solenoid valve 21 itself, the valve rod 8 is in the position where it is pulled up together with the armature 10 as shown in this figure, and the orifice 23A in the orifice valve body 23 is Since the opening is maintained together with the orifice 25A, the working fluid is guided from the A side to the B side through these orifices 23A and 25A, and the pressure is increased to the wheel cylinder side. Further, since such pressure increase is performed via the orifice, the rapid pressure increase is suppressed.

Next, when the wheel cylinder is required to hold the hydraulic pressure for antilock control, the solenoid 12 is excited to urge the armature 10 together with the valve rod 8 downward as shown in FIG. The valve portion 8A at the tip of the rod 8 contacts the seating member 25 and closes the orifice 25A. Then, the flow of the hydraulic fluid is stopped by this and the pressure is maintained. In this case, since the spring force of the spring 15 is set to be stronger than the flexibility of the seating member 25, the seating member 25 bends due to the above contact pressure, but the orifice valve body 23 itself does not move to the valve seat 22C. It is possible to keep the valve closed without being pushed down from.

When the brake operation is released, the hydraulic fluid pressure on the master cylinder side, that is, the A side is reduced, and the solenoid 12 is de-energized and demagnetized to demagnetize the valve rod 8 and the armature. 10 stays in the position shown in FIG. 1 and the hydraulic fluid pressure on the wheel cylinder side, that is, the B side becomes higher, so that the orifice valve body 23 becomes the spring force of the spring 15 as shown in FIG. Against it, it is pushed down along the large diameter passage 22B of the valve sheet member 22. As a result, the brake fluid flows from the B side to the A side through the orifices 25A and 23A, the gap 26 formed between the valve seat 22C and the outer peripheral portion of the seat member 25, and the 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]

[Effect of the device]

 As described above, according to the solenoid valve of the present invention, the solenoid valve is configured so as to have the functions of both the orifice and the check valve in association with the valve body. It can also be miniaturized.

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

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an embodiment according to a first mode of the present invention in a state of increasing pressure.

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

FIG. 3 is a partially enlarged view of FIG. 1, showing a state when the brake is released.

FIG. 4 is a vertical cross-sectional view showing another embodiment according to the second mode of the present invention in a state of increasing pressure.

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

FIG. 6 is a vertical cross-sectional view showing the embodiment shown in FIG. 4 in a state where liquid pressure is maintained.

FIG. 7 is a vertical cross-sectional view showing the embodiment shown in FIG. 4 when the brake is released.

[Explanation of Codes] 1 , 21 Solenoid valve 2 Casing 6 Bearing 6A Communication passage 6B Annular lower end (stopper member) 8 Valve rod 8A Valve part 9 Valve body 12 Solenoid 13,22 Valve seat member 13A Shoulder part 13D Cylindrical part 15 Spring 22A Small diameter passage 22B Large diameter passage 22C Valve seat 23 Orifice valve body 23A, 25A Orifice 23B Groove

Claims (2)

[Scope of utility model registration request] 1. A solenoid valve for opening and closing the axial communication passage formed in a valve seat member in a casing by a valve element axially driven by a solenoid, wherein the valve seat member has an axial line in the casing. A stopper member for urging the valve seat member toward the valve body and restricting the movement of the valve seat member to a predetermined position, the valve seat member being at the predetermined position when the communication passage is open. In some cases, 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 between the front and rear of the valve seat member. Solenoid valve characterized by 2. A solenoid valve capable of opening and closing the axial communication passage formed in a valve seat member in a casing by a valve element axially driven by a solenoid, wherein the valve seat member is fixed in the casing. An orifice is provided in the valve body which is biased by a spring arranged in the communication passage toward a valve seat provided at the end of the communication passage of the valve seat member, and the orifice is provided in the demagnetized state of the solenoid through the orifice. The communication path is maintained in an open state, pressure is maintained by closing the orifice of the valve body in the excited state of the solenoid, and the pressure difference between the front and rear of the valve seat member is maintained in the 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.