JPH06109152A - Fluid pressure controller - Google Patents

Abstract

PURPOSE:To simplify structure and facilitate assembling and also improve the adhesion between a valve part and valve seat by molding a valve body, which supports the valve part, which moves according to the fluid pressure in a casing, at a supporting section through its neck, of elastic material with reinforcing members embedded in the valve part in a body. CONSTITUTION:In a fuel pressure controller preferably used in the fuel injection device for internal combustion engines, when the pressure of the fuel pressedly sent from a suction pipe 2 increases, causing a diaphragm 13a to displace to the right against a spring 7, the valve body 13 held by a diaphragm 13b is separated from a valve seat 4, and the amount of the fuel flowing out to a discharge pipe 3 according to the distance of the separation, that is, the pressure of fuel is adjusted. In this case, the valve body 13 is molded of elastic material so as to have a valve part 13a, diaphragm 13b, and supporting section 13c in a body. In order to improve the mechanical strength of the valve part 13a and supporting section 13c for preventing deformation, metallic reinforcing plates 13d and 13f are embedded in the valve section 13a and supporting section 13c.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid pressure control device for maintaining a fluid pressure when a fluid is supplied to a predetermined value, for example, a fuel pressure control device applied to a fuel injection device of an internal combustion engine. Is.

[0002]

2. Description of the Related Art FIG.
FIG. 7 is a cross-sectional view of the conventional fuel pressure control device shown in FIG. 5 of the publication. In the figure, 1 is a case that forms a pressure chamber, and is provided with a suction pipe 2 and a discharge pipe 3. The suction pipe 2 is connected to a fuel supply pipe (not shown), and the discharge pipe 3 is connected to a fuel tank (not shown) via a return pipe (not shown) serving as a discharge passage. . 4 is a valve seat, and the central hole communicates with the discharge pipe 3. Reference numeral 5 denotes a cover, which is provided with a pipe 6 for introducing negative pressure on the intake side of the engine. Reference numeral 7 is a spring for controlling the fuel pressure, 8 is a valve element, and is composed of a valve 8a formed of a circular metal plate and a support member 8c rotatably supporting a ball 8b fixed to the valve 8a. It is configured. Reference numeral 9 is a diaphragm made of synthetic rubber, and its central portion is sandwiched by the support member 8c and the spring holder 10. The periphery of the diaphragm 9, together with the holding washer 11 and the gasket 12, is caulked between the case 1 and the cover 5 by curling. In the above structure, the spring 7 acts so as to press the valve body 8 against the valve seat 4.

Next, the operation will be described. When the fuel is pressure-fed from the suction pipe 2, the pressure in the case rises and the pressure is applied to the diaphragm 9. When the spring 7 starts to bend due to this pressure, the valve body 8 held by the diaphragm 9 is separated from the valve seat 4, and the amount of fuel flowing out to the discharge pipe 3 according to the separated size (flow passage area). Changes the pressure of the fuel flowing through the fuel feed pipe. That is, when the fuel pressure becomes high, the flow passage area between the valve seat 4 and the valve body 8 becomes large, the outflow amount to the discharge pipe 3 increases, and the pressure decreases. When the fuel pressure is low, the flow passage area is small, the amount of outflow to the discharge pipe 3 is small, and the pressure rises. In this way, the pressure of the fuel flowing through the fuel feed pipe is controlled to a preset value. When fuel is not being fed, there is no pressure, so the valve body 8 is pressed against the valve seat 4.

[0004]

Although the conventional fluid pressure control device is constructed as described above, both the valve seat 4 and the valve 8a are usually made of a surface-hardened metal material. . Therefore, the seal performance of the valve portion may be deteriorated due to slight wear, poor surface roughness, or the like, and the prescribed pressure control or pressure maintenance may not be possible. Also, the valve 8a
In order to improve the seating, the ball 8b makes the valve 8a move freely, and the parts configuration is complicated, and the machining and assembling work are difficult. Further, since both the valve seat 4 and the valve 8a are made of metal, there is a problem that the contact noise caused by opening and closing becomes a noise uncomfortable for the driver.

The present invention has been made to solve the above-mentioned problems, and the fluid pressure control which solves the problems of unpleasant noise by facilitating the manufacture of the valve body 8 with little deterioration of the sealing performance. The purpose is to obtain the device.

[0006]

In a fluid pressure control device according to the present invention, a valve portion arranged so as to come into contact with a valve seat in response to a fluid pressure in a housing is supported by a support portion via a neck portion. The valve body thus formed is integrally formed of an elastic material so that the reinforcing member is embedded in the valve portion, and the valve body is supported by the casing by the diaphragm.

Further, a valve body adapted to support a valve portion, which is arranged so as to come into contact with a valve seat in response to fluid pressure in the housing, through a neck portion, and the valve body. The diaphragm and the diaphragm supported on it are integrally formed of an elastic material.

Further, the neck portion is made smaller than the outer diameter of the valve portion, and the valve body is integrally formed of an elastic material.

Further, the neck portion is made smaller than the outer diameter of the valve portion, and the valve body and the diaphragm are integrally formed of an elastic material.

[0010]

In the fluid pressure control device according to the present invention, since the valve body is integrally formed of the elastic material so that the reinforcing plate is embedded in the valve portion, the deterioration of the sealing performance is prevented and the noise due to the opening and closing of the valve body is reduced. Become.

Further, by integrally molding the valve body and the diaphragm with an elastic material, the valve body portion and the diaphragm have the same material characteristics, the close contact between the valve portion and the valve seat is improved, and the sealing is ensured. .

Since the neck portion is formed smaller than the outer diameter dimension of the valve portion, the close contact between the valve portion and the valve seat is further improved, and the sealing is ensured.

Since the neck portion having a small diameter and the diaphragm are integrally formed, the performance is stable and the pressure control of the fluid is ensured.

[0014]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a case, 2 is a suction pipe, 3 is a discharge pipe serving as a discharge flow path, 4 is a valve seat, 5 is a cover, 6 is a pipe, and 7 is a spring, which are the same as those of the conventional device. Is. Reference numeral 13 denotes a valve body, which is formed by integrally molding a valve portion 13a, a diaphragm portion 13b, and a support portion 13c with an elastic material. In this case, in order to increase the mechanical strength of the valve portion 13a and prevent the valve portion 13a from being deformed, a reinforcing plate 13d made of a metal material is embedded in the valve portion 13a. Also,
A neck portion 13e having an outer size smaller than that of the valve portion 13a is provided on the back surface of the valve portion 13a, that is, between the valve portion 13a and the support portion 13c. Further, the reinforcing plate 1 is also provided on the support portion 13c.
3f is buried. As the elastic material, synthetic rubber or elastic synthetic resin is used.

The peripheral edge of the diaphragm portion 13b is a holding washer 1
1 and the gasket 12 are caulked between the case 1 and the cover 5 by curling. The spring 7 acts so as to press the valve portion 13a against the valve seat 4.
These are the same as those of the above-mentioned conventional device, but when the neck portion 13e is made thin, this portion bends and acts so that the valve portion 13a easily fits into the valve seat 4 and is accurately pressed.
The operation of controlling the fuel supply pressure is the same as that of the conventional device.

Example 2. Although the valve portion 13a, the diaphragm portion 13b, and the support portion 13c are integrally formed of an elastic material in the above embodiment, the valve portion 14a is formed as shown in FIG.
Only the elastic material may be formed. That is, in the valve body 14 of the second embodiment, the valve portion 14a, the support member 14c, the reinforcing plate 14d embedded in the valve portion 14a, the valve portion 14a and the support member 14c.
And a neck portion 14e having a tip connected to the support member 14c. The configuration and operation using the diaphragm 9, the spring holder 10, the holding washer 11, the gasket 12, etc. are the same as those of the conventional device.

By the way, in each of the above-described embodiments, the case where the present invention is applied to the fuel pressure control device in the fuel injection device of the internal combustion engine has been described, but it goes without saying that the present invention can also be applied to other fluid pressure control devices.

[0018]

As described above, according to the present invention, since the valve body is integrally molded with the elastic material so that the reinforcing plate is embedded in the valve portion, the close contact between the valve portion and the valve seat is ensured.

Further, since the valve body and the diaphragm are integrally formed of an elastic material, the structure is simple and the assembling work is easy.

Further, since the neck portion having an outer size smaller than that of the valve portion is provided on the back surface of the valve portion, the valve portion easily fits into the valve seat. In addition, since it is easy to fit in, the problem of poor surface roughness such as a metal valve portion is unlikely to occur, so that the sealing performance is improved and the pressure control of the fluid can be ensured.

Further, if the valve body having a small diameter neck portion and the diaphragm are integrally formed, the characteristics are further stabilized and the pressure control of the fluid is ensured.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a sectional view showing Embodiment 2 of the present invention.

FIG. 3 is a sectional view showing a conventional fluid pressure control device.

[Explanation of symbols]

 2 Suction pipe 3 Discharge pipe 4 Valve seat 7 Spring 13 Valve body 13a Valve part 13b Diaphragm 13d Reinforcing plate 13e Neck part

Claims (4)

[Claims] 1. A valve body having a valve portion arranged to come into contact with a valve seat in response to a fluid pressure in a housing, and a support portion for supporting the valve portion via a neck portion. A fluid pressure control device comprising a diaphragm that is supported by the housing, and integrally molding the valve body with an elastic material so that a reinforcing member is embedded in the valve portion. 2. A valve body having a valve portion arranged to abut against a valve seat in response to a fluid pressure in a housing, and a support portion for supporting the valve portion via a neck portion, and the valve body, A fluid pressure control device comprising a diaphragm supported on the casing, and the valve body integrally molded with the diaphragm by an elastic material. 3. A valve portion arranged so as to come into contact with a valve seat in response to a fluid pressure in the housing, and a support portion for supporting the valve portion via a neck portion smaller than the outer diameter dimension of the valve portion. And a diaphragm that supports the valve body in the casing, and the fluid pressure control device is formed by integrally molding the valve body with an elastic material. 4. A valve portion arranged so as to come into contact with a valve seat in response to fluid pressure in the housing, and a support portion for supporting the valve portion via a neck portion smaller than the outer diameter dimension of the valve portion. And a diaphragm for supporting the valve body in the housing, and the valve body is integrally molded with the diaphragm by an elastic material.