JP2605883Y2 - Pressure control 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 pressure control valve, and more particularly to an improvement in a fixing structure for press-fitting a pipe into a fluid outlet passage of a housing constituting a control valve chamber. The present invention relates to a fuel pressure control valve which is effective when used as a fuel pressure control valve for controlling pressure.

[0002]

2. Description of the Related Art Generally, in a vehicle such as an automobile, a fuel pressure control valve having a die-cast housing in a fuel supply passage for supplying fuel in a fuel tank to an engine is used.

In a housing of such a fuel pressure control valve, a fuel introduction path and a fuel discharge path communicating with the control valve chamber are formed in a housing forming a control valve chamber together with the diaphragm, and an outlet of the fuel discharge path is provided. A return pipe is press-fitted on the side. Then, a configuration is employed in which a seal ring is sandwiched between the joint between the return pipe and the housing to ensure the sealing performance.

[0004]

However, in the pressure control valve described above, a process for sandwiching the seal ring is required, so that the manufacturing cost is increased.

An object of the present invention is to provide a pressure control valve which can ensure the sealing property of a connection portion between a pipe and a housing simply by press-fitting the pipe into a fluid outlet passage of the housing.

[0006]

In the pressure control valve according to the present invention, a fluid introduction passage and a fluid discharge passage communicating with the control valve chamber are formed in a housing constituting a control valve chamber together with a diaphragm. In a pressure control valve in which a pipe is press-fitted on the outlet side of the outlet path, a female taper portion whose outlet side end has a gradually larger diameter is formed on the inner wall surface of the outlet side of the fluid outlet path, and on the outer peripheral surface of the pipe. A male taper portion is formed, a taper angle of the female taper portion is set larger than a taper angle of the male taper portion, and an axial length of the female taper portion is set in an axial direction of the male taper portion. Is set to be shorter than the length of the female taper portion and the male taper portion.
Is press-fitted, the female tapered portion and the male
It is characterized in that the joint with the taper portion is joined with residual stress .

[0007]

According to the above-mentioned means, when the pipe is press-fitted into the fuel discharge passage, a part of the housing constituting the female tapered portion is plastically deformed by the male tapered portion, and the material is compressed to leave residual stress. In this state, it is possible to sufficiently secure the sealing property of the connection between the pipe and the housing only by press-fitting the pipe into the fluid outlet path.

[0008]

1 (a) and 1 (b) are enlarged side sectional views showing a dimensional relationship between a female taper portion and a male taper portion of a fuel pressure control valve according to an embodiment of the present invention before and after press-fitting. . FIG. 2 is a partially cut-away side view showing the pressure control valve.

In the present embodiment, the fuel pressure control valve 10 according to the present invention is mounted on an automobile and configured to control the fuel pressure to be constant. The housing 11 is made of die-cast, the diaphragm 12, and the spherical valve. A body 13 is provided. A fuel introduction passage 14 and a fuel outlet passage 15 are opened in the housing 11 and both passages 14 and 1
5, a control valve chamber 16 is formed.

A pipe press-in hole 26 is formed on the outlet side of the fuel outlet passage 15, and a return pipe 17 connected to a fuel tank is press-fitted in the pipe press-in hole 26. A valve spring 18 made of a coil spring is fitted in an intermediate portion of the fuel outlet passage 15, and a spherical valve body 13 is inserted in the inlet side. This spherical valve 13
Is formed using a steel ball, and is configured to be detached and seated on the valve seat surface of the concave spherical surface.

The diaphragm 12 forms a part of the wall surface of the control valve chamber 16 and is fastened to a flange 19 of the housing 11 together with a case 21 forming an atmosphere chamber 20.
A holding hole 22 is formed in the center of the diaphragm 12, and a receiving member 23 is mounted in the holding hole 22. One end of the receiving member 23 is in contact with the spherical valve body 13, and the other end of the receiving member 23 is fixed to a support plate 24 that is in contact with the diaphragm 12.

A return spring 25 composed of a coil spring is interposed between the support plate 24 and the end face wall of the case 21 in a state of accumulation, and the diaphragm 12 is moved toward the spherical valve 13 by the urging force of the return spring 25. The spherical valve 13 is constantly pressed in the direction of closing the inlet side of the fuel outlet passage 15 by the urging force of the return spring 25.

When fuel is supplied into the control valve chamber 16 and the pressure in the control valve chamber 16 increases, the diaphragm 1
2 is the atmosphere chamber 2 against the urging force of the return spring 25.
It moves to the 0 side. At this time, the spherical valve body 13 is moved toward the diaphragm 12 by the urging force of the valve spring 18 and moves away from the valve seat surface, so that the inlet side of the fuel outlet passage 15 is opened. That is, the fuel introduction path 1
4 and the fuel outlet path 15 are communicated via the control valve chamber 16 to be in a valve-open state.

Here, the pipe press-fit hole 2 of the housing 11
The specific configuration of the connection between the return pipe 6 and the return pipe 17 will be described.

As shown in FIG. 1 (a), a female taper portion 15b for connecting a return pipe gradually increases toward the outlet side at the open end of the pipe press-fit hole 26 on the straight portion 15a side. It is formed to have a diameter. On the other hand, the outer peripheral surface of the return pipe 17 has a female tapered portion 15b.
The male tapered portion 17b is formed so as to gradually decrease in diameter toward the press-fit hole 26. The proximal end of the male taper portion 17b of the return pipe 17 are protruded from the ring-shaped flange portion 17a is radially outward, serrations are formed on the outer periphery thereof. Tsuba of return pipe 17
The portion 17a is the outer end of the pipe press-fit hole 26 of the housing 11.
By being fitted into a circular hole formed around the
And stop the return pipe 17 from rotating.
You.

The taper angle θ of the female tapered portion 15b
₁ is set to be larger than the taper angle θ ₂ of the male taper portion 17b, and the axial length L of the female taper portion 15b
₁ is set to be shorter than the axial length L ₂ of the male taper portion 17b. That is, the straight portion 1 of the press-fit hole 26
When the return pipe 17 is press-fitted into the pipe 5a, the female tapered portion 15b is joined so that the joint between the return pipe 17 and the pipe press-fit hole 26 is joined with residual stress.
And the taper angles θ ₁ , θ ₂ and the axial lengths L ₁ , L _{2 of the} male tapered portion 17b are set respectively.

Next, the female taper portion 15b and the male taper portion 17
The sealing action in connection with b will be described. After various steps, the spherical valve 13 and the like are mounted in the housing 11 and the case 21 is fixed to the housing 11, the return pipe 17 is pressed into the pipe press-fit hole 26 of the housing 11.

As shown in FIG. 1B, when the male taper portion 17b of the return pipe 17 is press-fitted into the female taper portion 15b of the pipe press-fit hole 26, the female taper portion 15b
And the male taper portion 17b have a dimensional relationship of θ ₁ > θ ₂ and L ₁ <L ₂ , so that the region (straight line) shown by oblique lines in FIG. Part 15a
(A connection portion between the female taper portion 15b and the female taper portion 15b), the joint between the female taper portion 15b and the male taper portion 17b undergoes plastic deformation, but a residual stress due to compression acts on the material. For this reason, the joint surface between the tapered portion 15b and the tapered portion 17b maintains the seal.

According to this embodiment, the sealing state of the connection between the return pipe 17 and the pipe press-fitting hole 26 is ensured only by the press fitting of the return pipe 17 into the pipe press-fitting hole 26. Therefore, a step for sandwiching the seal ring in a connection portion between the return pipe 17 and the pipe press-fitting hole 26 and a step for brazing can be omitted, and the manufacturing cost can be reduced.

[0020]

[Effects of the Invention] As described above, according to the present invention,
By simply press-fitting the pipe into the fluid outlet passage, a sealed state of the connection between the pipe and the fluid outlet passage can be ensured, and as a result, it is possible to contribute to a reduction in manufacturing cost.

[Brief description of the drawings]

FIGS. 1A and 1B are enlarged side sectional views showing a dimensional relationship between a female taper portion and a male taper portion of a fuel pressure control valve according to an embodiment of the present invention before and after press-fitting.

FIG. 2 is a partially cut-away side view showing the pressure control valve.

[Explanation of symbols]

Reference Signs List 10: fuel pressure control valve, 11: housing, 12: diaphragm, 13: spherical valve body (ball), 14: fuel introduction path, 15: fuel outlet path, 15a: pipe press-in hole, 15b
... female taper part, 16 ... control valve chamber, 17 ... return pipe, 17a ... flange part, 17b ... male taper part, 18 ... valve spring, 19 ... flange part, 20 ... atmosphere chamber, 21 ...
Case, 22: holding hole, 23: receiving member, 24: support plate,
25: return spring, 26: pipe press-fit hole, θ ₁
... taper angle of the female taper portion, theta ₂ ... taper angle of the male taper portion, L ₁ ... female tapered portion the axial length of the, L ₂ ... axial length of the male tapered portion.

Continued on the front page (72) Inventor Ken Hashimukai 1-2681, Hirosawa-cho, Kiryu-shi, Gunma Co., Ltd. Mitsuha Electric Machinery Works (56) References Tokiko Sho 52-20179 (JP, B2) 2-19578 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16K 17/04

Claims (1)

(57) [Scope of request for utility model registration] 1. A pressure, in which a fluid introduction passage and a fluid outlet passage communicating with the control valve chamber are formed in a housing forming a control valve chamber together with a diaphragm, and a pipe is press-fitted into an outlet side of the fluid outlet passage. In the control valve, a female taper portion whose outlet side end has a gradually increasing diameter is formed on the outlet side inner wall surface of the fluid outlet passage, and a male taper portion is formed on the outer peripheral surface of the pipe, and the female taper portion has The taper angle is set larger than the taper angle of the male taper portion,
And, wherein it is set shorter axial length of the female taper portion than the length in the axial direction of the male taper portion, the female tape
In a state where the male taper portion is pressed into the
The joint between the female taper and the male taper has residual stress.
A pressure control valve, wherein the pressure control valve is connected in an inclined state .