JP2000055214A - Valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve device for eliminating the particularly precise formation of the surface precision and flatness of the end surface, and of squareness to a rod regardless of the material of the valve element, accordingly easy to form the valve element, and advantageous to a cost. SOLUTION: In this device, a valve element 8 displaced in an axial direction to switch opening/closing a flow passage 22 is slidably inserted into a valve hole 16. In this case, the outer peripheral surface of the valve element 8 is provided with a notch-like, recess-like, or hole-like communication part for blocking the valve hole 16 when the valve element 8 is positioned in one end section in the axial direction displacement of the valve element 8, and also for opening the valve hole 16 when positioned in another end section in the axial direction displacement.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve device for switching the opening and closing of a flow path.

[0002]

2. Description of the Related Art Conventionally, a valve device shown in FIG. 8 has been known and is configured as follows. This valve device is used as an intercooler bypass valve in an intake system of an internal combustion engine such as a vehicle.

First, a resin valve body 52 fixed to an internal combustion engine or the like via a bracket 51 is provided, and a flexible diaphragm 53 is provided inside the valve body 52. A rod 54 made of resin is connected to an operating portion of the diaphragm 53.
A valve element 55 is formed integrally with the tip of the rod 54. The valve body 55 is provided with the diaphragm 53 and the rod 5
4, the valve body 52 is displaced in the axial direction with the actuation of the valve seat 4, and in conjunction with this, comes into contact with and separates from the valve seat 56 integrally formed in the valve body 52 to open and close the valve hole 57 inside the valve seat. As a result, the valve hole 57 and the valve chamber 5
The flow path 61 reaching the exhaust port 60 via the opening 9 is opened and closed. The diaphragm 53 and the rod 54 are constantly displaced downward by being pressed by a spring 63 installed in a negative pressure chamber 62 provided above the diaphragm 53, whereby the valve body 55 is seated on the valve seat 56. The valve hole 57 is closed.

In this closed state, the valve body 5
When a negative pressure whose absolute value is equal to or larger than a predetermined value is introduced into the negative pressure chamber 62 from the negative pressure port 64 provided in the pressure chamber 2, the negative pressure causes the diaphragm 53 and the rod 54 to resist the elasticity of the spring 63. And the valve element 55 is
6, the valve hole 57 is opened, and the flow path 61 is opened. When the absolute value of the negative pressure introduced into the negative pressure chamber 62 changes below a predetermined value in this valve open state, the elasticity of the spring 63 causes the diaphragm 53 and the rod 5 to move downward.
4, the valve element 55 is seated on the valve seat 56 to close the valve hole 57, and the flow path 61 is closed. The intercooler bypass valve has a function of automatically adjusting the magnitude of the supply pressure by opening the valve when the magnitude of the supply pressure in the intake system is excessive as described above and recirculating a part of the pressure that is too high. To fulfill.

[0005] However, the conventional valve device has the following disadvantages.

That is, if the valve body 55 is made of resin together with the rod 54 and the body 52 as described above from the viewpoint of weight reduction of parts in recent years, the valve seat is required to secure airtightness when the valve is closed. The surface accuracy and flatness of the seal end surface 55a of the valve body 55 which comes into contact with and separates from the 56 must be formed with high precision, and the perpendicularity of the seal end surface 55a to the rod 54 must also be formed with high accuracy. Therefore, it takes a lot of trouble and time to form these surface accuracy, flatness, and squareness with high accuracy, which is disadvantageous in terms of manufacturing cost.

As another prior art, a valve device made of metal in the valve device shown in FIG. 8 is known. Even in this case, the surface accuracy and flatness of the seal end face of the valve member are improved. The situation where the molding must be performed with high precision and the perpendicularity of the seal end face with respect to the rod must be performed with high precision is the same as in the case of resin. There is also known a valve device in which a rubber seal is vulcanized and bonded to an end surface of a metal valve body, and the seal is brought into contact with and separated from a valve seat. To be added to the process,
This requires extra labor and time, and is disadvantageous in terms of cost.

[0008]

SUMMARY OF THE INVENTION In view of the above, the present invention has been made in consideration of the surface accuracy of the end face, regardless of the material of the valve body.
It is an object of the present invention to provide a valve device which does not need to form the flatness and the perpendicularity with respect to the rod with high precision, thereby facilitating the forming of the valve body, and which is advantageous in cost.

[0009]

In order to achieve the above object, a valve device of the present invention has a valve body which is displaced in an axial direction and switches between opening and closing of a flow path, is slidably inserted into a valve hole, Notch, concave or hole-shaped that closes the valve hole when the valve body is located at one end of its axial displacement and opens the valve hole when it is located at the other end of its axial displacement. The communicating portion is provided on the outer peripheral surface of the valve body.

In the valve device of the present invention having the above structure, the valve body does not come into contact with or separate from the valve seat, but the valve body is always inserted inside the valve hole, and the axial stop position is determined. By displacing, the opening and closing of the valve hole is switched. The valve is opened by exposing a notched, concave, or hole-shaped communication portion provided on the outer peripheral surface of the valve body to the valve chamber side, so that the valve hole and the valve chamber communicate with each other through the communication portion. And closing the valve
This is performed when the communication portion is closed by the inner wall of the valve hole and communication between the valve hole and the valve chamber is closed. Therefore, there is no need to form a sealing surface on the end face of the valve body because the state in which the valve body is seated on the valve seat when the valve is closed as in the above-described prior art does not occur. There is no need to form the squareness with respect to the rod with high precision.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a cross section of a valve device according to the embodiment, and FIG. 2 shows an enlarged view of a valve element 8 in the valve device. The valve device is used as an intercooler bypass valve in an intake system of an internal combustion engine such as a vehicle, and is configured as follows.

First, a resin valve body (also referred to as a body or a housing) 2 fixed to an internal combustion engine or the like via a metal bracket 1 having a flat shape is provided. 2a and an upper cup 2b are provided.
A diaphragm 3 made of a flexible material such as rubber is provided between the upper cup 2a and the upper cup 2b. A diaphragm retainer 4 is disposed below the operating portion of the diaphragm 3, and a spring retainer 5 is also disposed above the operating portion to provide a laminated portion 6 having a three-layer structure. The upper end of a rod 7 made of resin is connected and fixed thereto, and a valve body 8 is also integrally formed at the lower end of the rod 7. The valve element 8 will be described later.

An airtight space surrounded by the diaphragm 3 and the upper cup 2b is a negative pressure chamber 9, and a negative pressure is applied to the upper cup 2b so that a negative pressure of the internal combustion engine can be introduced into the negative pressure chamber 9. A pressure port 10 is provided. Further, in the negative pressure chamber 9, a spring retainer 5, a diaphragm 3, a diaphragm retainer 4, a rod 7, and a valve body 8 are provided.
A coil-shaped spring 11 that elastically urges the assembled assembly downward is disposed.

A bearing 12 for slidably supporting the rod 7 in the axial direction is provided below the laminated portion 6 including the diaphragm 3 and the diaphragm retainer 4 and the like.
Further below the bearing 12, a rod seal 13 having a seal lip 13a slidably in close contact with the peripheral surface of the rod 7 is provided. The bearing 12 and the rod seal 13 are fixed to the stepped portion of the inner wall of the body 2 by means of press fitting, caulking, welding, or the like, with their outer peripheral edges. Diaphragm 3 and rod seal 1
The airtight space between the pressure chamber 3 and the pressure chamber 3 is an atmospheric pressure chamber 14, and an atmospheric pressure port 15 is provided in the body 2 so that the atmospheric pressure can be always introduced into the atmospheric pressure chamber 14.

A valve hole 16 is provided at the lower portion of the body 2 so as to have the same axis as the rod 7, and an intake port 17 is provided below the valve hole 16 by being appropriately bent. The valve hole 16 is open at the upper end thereof to a valve chamber 18 inside the body 2, and an exhaust port 19 is provided on a side wall of the valve chamber 18.

A valve element 8 integrally formed at the lower end of the rod 7
Is slidably inserted into the valve hole 16 from above, and is axially displaceable with respect to the valve hole 16.
Over the entire stroke of the axial displacement, the valve is prevented from coming off the valve hole 16 toward the valve chamber 18. As shown in FIG. 2, a communicating portion that closes the valve hole 16 when the valve body 8 is located at the lower end of its axial displacement and opens the valve hole 16 when it is located at the upper end of its axial displacement. 21
Is provided so as to open to the outer peripheral surface of the valve body 8. In FIG. 2, the communication portion 21 is provided as a cutout provided on the lower surface of the valve body 8, and the cutout is provided in the valve body 8.
Is diametrically penetrated through the lower surface of the valve body 8 and is opened at a position symmetrical with respect to the outer peripheral surface of the valve element 180 by 180 degrees.

As shown in FIG. 1, a seal member 20 is provided on the bottom surface of the valve chamber 18 so that pressure or fluid does not leak from between the outer peripheral surface of the valve body 8 and the inner wall of the valve hole 16. The seal member 20 is fixed by means such as press-fitting, caulking or welding, and a seal lip 20a provided radially inward at the inner peripheral end of the seal member 20 is always slidable on the outer peripheral surface of the valve body 8. Close. In addition, this seal lip 20
A round portion 21a for preventing biting is provided in the peripheral portion of the opening of the communication portion 21 so that a does not bite into the communication portion 21 of the valve body 8 due to axial displacement of the valve body 8 and is not damaged. Have been.

In the valve device having the above structure, as shown in the left half of FIG. 1, at first, the spring retainer 5, the diaphragm 3, the diaphragm retainer 4, the rod 7, and the valve body 8 are pushed down by the elasticity of the spring 11, It is located at the lower end of the axial displacement. At the lower end limit position, the valve body 8 is deeply sunk into the valve hole 16, and thus the communication portion 21 opened on the outer peripheral surface of the valve body 8 is closed by the inner wall of the valve hole 16. Therefore, the valve hole 16 is in a non-communication state, and the flow path 22 from the intake port 17 to the exhaust port 19 via the valve hole 16 and the valve chamber 18 is closed.

In this closed state, the valve body 2
When a negative pressure whose absolute value is equal to or larger than a predetermined value is introduced into the negative pressure chamber 9 from the negative pressure port 10 provided in the upper case 2b, as shown in the right half of FIG. The spring retainer 5, the diaphragm 3, the diaphragm retainer 4, the rod 7, and the valve body 8
And moves to the upper end of the axial displacement. In this upper end limit position, the communication part 21 opened on the outer peripheral surface of the valve body 8 is exposed to the valve chamber 18 side, and thus the valve hole 16 and the valve chamber 18 communicate with each other through the communication part 21. Therefore, the valve hole 16 is in a communicating state, and the flow path 21 is opened. During this valve opening operation, a part of the excessive supply pressure is recirculated. In this open state, the negative pressure port 10 connects to the negative pressure chamber 9.
When the absolute value of the negative pressure introduced into the spring falls below a predetermined value, the spring retainer 5, the diaphragm 3, the diaphragm retainer 4, the rod 7, and the valve body 8 descend due to the elasticity of the spring 11, and move to the lower end position of the axial displacement. After returning, the communication part 21 is closed, the valve hole 16 is closed, and the flow path 21 is closed.

The valve device which operates as described above is characterized in that the above-described configuration has the following effects.

That is, first, as described above, the valve element 8 is always inserted inside the valve hole 16, and the opening and closing of the valve hole 16 is switched by displacing the axial stop position. Therefore, the state in which the valve body is seated on the valve seat when the valve is closed as in the above-described prior art does not occur, there is no need to form a sealing surface on the end face of the valve body 8, and the surface accuracy of the end face of the valve body 8 is not required. , Flatness, and perpendicularity to the rod 7 need not be formed with high precision. Therefore,
The molding of the valve body 8 can be facilitated, and a valve product advantageous in terms of manufacturing cost can be provided.

Since the outer peripheral surface of the valve body 8 is provided with the seal member 20 having the seal lip 20a which is always slidably in close contact with the outer peripheral surface of the valve body 8 and the inner wall of the valve hole 16. It is possible to prevent pressure or fluid from leaking out from between. Therefore, it is possible to provide a valve product in which pressure or fluid does not leak even though the valve body is inserted.

The configuration of the valve device according to the above embodiment can be added or changed as follows.

The rod 7 and the valve body 8 are formed separately, and the two are connected and fixed after the formation. The material of the valve body 8 is made of metal. As shown in FIG. 3, the valve body 8 of FIG. 2 is a hollow body integrally provided with a cylindrical peripheral wall 8a and a top wall 8b to further reduce the weight. In this case, a pair of notched communication portions 21 are provided at 180-degree symmetric positions of the peripheral wall 8a. The communication part 21 may be formed in a hole shape.

As shown in FIG. 4, in the lower part of the outer peripheral surface of the columnar valve body 8, a required number of recessed communicating portions 21 are provided in an equal arrangement. In the figure, they are evenly distributed. The communication portions 21 are respectively recessed with respect to the outer peripheral surface and the lower surface of the valve body 8. As shown in FIG. 5, the valve body 8 of FIG. 4 is realized as a hollow body integrally having a cylindrical peripheral wall 8a and a top wall 8b to further reduce the weight. The communication part 21 may be formed in a hole shape.

As shown in FIG. 6, a concave portion 8c is provided on the lower surface of the cylindrical valve body 8, and a cylindrical side wall 8d is formed around the concave portion 8c.
Are provided on the side wall 8d, and a required number of the notched communication portions 21 are provided in an equal arrangement. In the figure, they are twelve equally distributed. Communication part 2
1 may be hole-shaped. As shown in FIG. 7, the valve body 8 of FIG. 6 is realized as a hollow body having a cylindrical peripheral wall 8 a and a top wall 8 b integrated with each other, thereby further reducing the weight. In this case, the side wall 8d and the peripheral wall 8a
Are integrated with each other. The communication portion 21 may be a hole.

The diameter of the rod 7 and the diameter of the valve element 8 are unified, and the outer peripheral surfaces of both are formed straight. In this case, after the seal member 20 and the rod seal 13 are attached to the inside of the body 2, the spring retainer 5, the diaphragm 3, the diaphragm retainer 4, the rod 7, and the valve body 8 are assembled and retrofitted together. Therefore, the assembly line can be separated, the cycle time in the process can be shortened, and the assembly cost can be further reduced. Although the rod 7 and the valve body 8 are integrally formed, they may be formed separately and connected and fixed after forming. The seal member 20 is mounted on the outer peripheral surface of the valve body 8 and is always slidably in close contact with the inner wall of the valve hole 16. In this case, it is preferable to use a packing such as an O-ring other than the lip seal as the type of the seal.

[0029]

The present invention has the following effects.

That is, in the valve device of the present invention having the above structure, the valve body is always inserted inside the valve hole, and the opening and closing of the valve hole is switched by displacing the axial stop position. Is configured to
The state in which the valve body is seated on the valve seat when the valve is closed as in the prior art does not occur, there is no need to form a seal surface on the end face of the valve body, and the surface accuracy, flatness, and rod There is no need to mold the squareness with high precision. Therefore, it is possible to facilitate the molding of the valve body, and it is possible to provide a valve product which is advantageous also in terms of manufacturing cost.

[Brief description of the drawings]

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

FIG. 2 is an enlarged view of a valve body according to the embodiment,
(A) is a front view, (B) is a longitudinal sectional view, and (C) is a bottom view.

3A and 3B are diagrams showing another example of a valve body, wherein FIG. 3A is a front view, FIG. 3B is a longitudinal sectional view, and FIG. 3C is a bottom view.

4A and 4B are diagrams showing another example of the valve body, wherein FIG. 4A is a front view, FIG. 4B is a longitudinal sectional view, and FIG.

5A and 5B are diagrams showing another example of the valve body, wherein FIG. 5A is a front view, FIG. 5B is a longitudinal sectional view, and FIG.

6A and 6B are diagrams showing another example of the valve body, wherein FIG. 6A is a front view, FIG. 6B is a longitudinal sectional view, and FIG.

7A and 7B are diagrams showing another example of the valve body, wherein FIG. 7A is a front view, FIG. 7B is a longitudinal sectional view, and FIG.

FIG. 8 is a sectional view of a valve device according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bracket 2 Valve body 2a Body main body 2b Upper cup 3 Diaphragm 4 Diaphragm retainer 5 Spring retainer 6 Stacking part 7 Rod 8 Valve 8a Peripheral wall 8b Top wall 8c Depression 8d Side wall 9 Negative pressure chamber 10 Negative pressure port 11 Spring 12 Bearing Seal 13a, 20a Seal lip 14 Atmospheric pressure chamber 15 Atmospheric pressure port 16 Valve hole 17 Intake port 18 Valve chamber 19 Exhaust port 20 Seal member 21 Communication part 21a R part 22 Flow path

Claims (1)

[Claims] 1. A valve element (8) which is displaced in an axial direction to switch between opening and closing a flow path (22) is slidably inserted into a valve hole (16), and said valve element (8) is mounted on a shaft thereof. A notch, recess or hole that closes the valve hole (16) when located at one end of the directional displacement and opens the valve hole (16) when located at the other end of the axial displacement. A valve device, wherein a communication part (21) is provided on an outer peripheral surface of the valve body (8).