JPH04341670A - Manufacture of pressure control valve - Google Patents

Abstract

PURPOSE:To form a valve seat surface of a concave spherical surface, copied after the convex spherical form of a spherical valve element, in a housing. CONSTITUTION:In the manufacture of a pressure control valve in which a fuel inlet passage 14 and a fuel outlet passage 15 are formed in a housing 11, a spherical valve element installing part 37 is formed in this fuel outlet passage 15, and a spherical valve element 13 is attached to this spherical valve element installing part 37, the spherical valve element 13 itself is used as a jig for forming a valve seat surface, while pressing force is given to the spherical valve element 13 attached to the spherical valve element installing part 37 and thereby punching takes place, through which a valve seat surface 43 of a concave spherical surface, copied after a convex spherical surface of the spherical valve element 13 is formed on a wall surface of the die casting housing 11.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a method for manufacturing a pressure control valve, and in particular to an improvement in the manufacturing process for the valve seat surface of the pressure control valve, for example, controlling the amount of fuel supplied according to the fuel pressure. The present invention relates to a method for manufacturing a pressure control valve that is effective for use in technology for manufacturing fuel pressure control valves.

0002

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

In such a fuel pressure control valve, a housing that forms a control valve chamber together with a diaphragm is formed with a fuel introduction passage and a fuel discharge passage that communicate with the control valve chamber. A valve body is attached to the side. It is known that a ball (spherical valve element) is used as this valve element (for example,
See Publication No.-17486. ).

[0004] In such a fuel pressure control valve that uses a ball as a valve body, when installing the ball as a valve body in the fuel discharge passage, the ball is brought into close contact with the valve seat surface to ensure sealing performance. Therefore, it is necessary to form a concave spherical valve seat surface on the valve body mounting portion of the fluid discharge path.

[0005] Therefore, in the method of manufacturing such a pressure control valve, when forming the valve seat surface in the fuel discharge passage,
Inserting a spherical jig with the same shape as the ball into the valve body mounting part of the housing and punching the jig to form a concave spherical valve seat surface on the contact surface between the jig and the valve body mounting part. Generally considered.

[0006]

[Problems to be Solved by the Invention] However, in this method of manufacturing a pressure control valve, when the jig is worn out, the shape of the jig becomes different from the shape of the ball as a spherical valve body. Therefore, even if punching is performed, there is a risk that the sealing performance will deteriorate. For this reason, punching must be performed while constantly measuring the shape of the jig, which increases the cost of maintaining the jig. Furthermore, the cost of manufacturing the jig itself is high.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing a pressure control valve that can increase productivity while forming a valve seat surface on a housing that matches the shape of a spherical valve body.

[0008]

[Means for Solving the Problems] In the method of manufacturing a pressure control valve according to the present invention, a housing that forms a control valve chamber together with a diaphragm has a fluid introduction passage and a fluid discharge passage that communicate with the control valve chamber. , a spherical valve body mounting part in which a spherical valve body interlocking with the diaphragm is mounted is formed on the inlet side of the fluid discharge path, and the spherical valve body mounting part is formed at a position facing the diaphragm mounting opening of the housing, In a method of manufacturing a pressure control valve in which a pipe pressure inlet is formed on an outlet side of a fluid discharge passage, an elastic member for applying a biasing force to a spherical valve body from the diaphragm mounting opening side of the housing into the fluid discharge passage. Next, insert the spherical valve element into the spherical valve element mounting part of the fluid discharge path, and apply pressure to the spherical valve element from the diaphragm mounting opening side of the housing to remove the spherical valve element from the spherical valve element mounting part. The present invention is characterized in that the contact surface with the body is punched, and by this punching, a concave spherical valve seat surface is formed on the contact surface of the spherical valve body mounting portion with the spherical valve body.

[0009]

[Operation] According to the above-mentioned means, the spherical valve body itself is used as a jig, and a pressing force is applied to the spherical valve body inserted into the spherical valve body mounting portion of the fluid discharge path, so that the spherical valve body of the spherical valve body mounting portion is removed. Since a concave spherical valve seat surface is formed by punching the contact surface with the body, the valve seat surface can be accurately formed to match the shape of the spherical valve body. In addition, jig wear and
Productivity can be increased because considerations for manufacturing jigs can be eliminated.

0010

[Example] Fig. 1 is a side sectional view showing the valve spring and spherical valve body charging process in the manufacturing method of a fuel pressure control valve according to an embodiment of the present invention, and Fig. 2 is a side sectional view showing the valve seat surface forming process. 3 is an enlarged partial sectional view showing the valve seat surface after formation, FIG. 4 is a side sectional view showing the diaphragm unit assembly process, FIG. 5 is a side sectional view showing the caulking process, and FIG. 6 is the manufactured valve seat. FIG. 7 is a side sectional view showing the fuel pressure control valve, FIG. 7 is a side sectional view showing the housing, and FIG. 8 is a rear view showing the housing.

In this embodiment, a fuel pressure control valve 10 according to the present invention includes a die-cast housing 11, a diaphragm 12, and a spherical valve body 13.
A fuel inlet passage 14 and a fuel discharge passage 15 are provided in the passageway 14, and a control valve chamber 16 is provided between the passages 14 and 15.
is formed. A pipe pressure inlet 15a is formed on the exit side of the fuel discharge passage 15.
A return pipe 17 connected to a fuel tank is press-fitted into a. A valve spring 18 made of a coil spring is fitted into the middle of the fuel discharge passage 15, and a spherical valve body 13 is fitted into the inlet side. This spherical valve body 13 is constructed using a steel ball (sometimes referred to as a ball), and is adapted to be seated on and off a concave spherical valve seat surface 43 formed as described below.

The diaphragm 12 constitutes a part of the wall surface of the control valve chamber 16, and is fixed to the flange portion 19 of the housing 11 together with a case 21 constituting an atmospheric chamber 20. A holding hole 22 is formed in the center of the diaphragm 12, and a receiver 23 is installed in the holding hole 22. One end of the receiver 23 is in contact with the spherical valve body 13, and the other end of the receiver 23 is fixed to a support plate 24 that is in contact with the diaphragm 12. A return spring 25 made of a coil spring is interposed between the support plate 24 and the end wall of the case 21 in a stored state, and the diaphragm 12 is always attached to the spherical valve body 13 side by the biasing force of the return spring 25. Return spring 2
The energizing force 5 constantly pushes the spherical valve body 13 in the direction of closing the inlet side of the fuel discharge passage 15.

When fuel is supplied into the control valve chamber 16 and the pressure inside the control valve chamber 16 increases, the diaphragm 12 moves toward the atmospheric chamber 20 against the biasing force of the return spring 25. It has become. At this time, the spherical valve body 13 is moved toward the diaphragm 12 by the urging force of the valve spring 18 and separated from the valve seat surface 43.
The inlet side of the fuel discharge path 15 is opened. That is, the fuel introduction passage 14 and the fuel discharge passage 15 are in an open state in which they are communicated with each other via the control valve chamber 16.

[0014] Here, the configuration of the housing 11 before assembly will be explained. As shown in FIGS. 7 and 8, a mounting flange 26 for mounting the fuel pressure control valve 10 on a machine frame or the like is integrally formed on the outside of the housing 11 by die-casting. Flange 2
6 is disposed outside the fuel introduction path 14 and integrally protrudes. The mounting flange 26 is formed into a substantially elliptical flat plate shape, and is perpendicular to the center line of the fuel introduction passage 14.
In addition, they are protruded in a symmetrical manner. Mounting flange 26
A through hole 27 that substantially constitutes the fuel introduction passage 14 is provided in the center of the mounting flange 26 .
Mounting holes 28 and 29 are provided on both sides of the holder. A connection port 30 is provided at the edge of the through hole 27 of the mounting flange 26.
is integrally molded into a cylindrical shape, protruding in a direction perpendicular to the mounting flange 26, and a stop ring portion 31 for fitting a seal ring (not shown) is provided at the tip of the connection port portion 30. is integrally molded.

A first seat surface 32 is formed on the diaphragm side end surface of the mounting flange 26 in a flat plate shape so as to be substantially orthogonal to the axis of the pipe inlet 15a. Further, a boss 33 is formed in a protruding manner on the back surface of the housing 11 on the opposite side from the mounting flange 26.
Similarly to the first seat surface 32 of the mounting flange 26, a second seat surface 34 is formed on the diaphragm side end surface in a flat plate shape so as to be substantially perpendicular to the axis of the pipe inlet 15a. Further, the first seat surface 32 and the second seat surface 34 are formed to form substantially the same plane.

On the other hand, inside the housing 11 made of aluminum die-casting, a pole portion 35 for forming the fuel discharge passage 15 is formed at a position facing the diaphragm mounting opening 36. On the inner peripheral side of this pole portion 35, a spherical valve body mounting portion 37 and a valve spring mounting portion 3 are provided.
8 are arranged so as to substantially form a fuel discharge passage 15. The inner diameter of the spherical valve body mounting portion 37 is set to be approximately equal to the diameter of the ball into which the spherical valve body (ball) 13 can be inserted, and there is a taper at the boundary between the spherical valve body mounting portion 37 and the valve spring mounting portion 38. A portion 39 is formed.

Further, a circular ring-shaped annular groove 41 into which a rib 40 of the diaphragm 12 can be press-fitted is formed on the surface of the flange portion 19 of the housing 11, which is integrally formed by die-casting aluminum. Incidentally, the ribs 40 of the diaphragm 12 are arranged concentrically on the outer periphery of the inner main surface of the diaphragm 12 integrally molded into a substantially disk shape, and are integrally protruded into a circular ring shape.

Next, a concave spherical valve seat surface is formed on the tapered portion 39 of the housing 11 made of aluminum die-casting according to the above structure, and then the case 21 and the return pipe 17 are assembled to the housing 11, thereby achieving the above structure. Each process of manufacturing the fuel pressure control valve 10 will be explained.

First, as shown in FIG. 1, the valve spring 18 is inserted into the valve spring mounting part 38 from the diaphragm mounting opening 36 side of the housing 11, and then the valve spring 18 is inserted into the spherical valve body mounting part 37. A ball (steel ball) as the spherical valve body 13 is inserted into the valve body.

Next, as shown in FIG. 2, a cylindrical jig 42 is inserted from the diaphragm mounting opening 36 side, and the tip of the jig 42 is brought into contact with the upper surface of the spherical valve body 13. . Pressure is then applied to the spherical valve body 13 via the jig 42 to perform punching.

By this punching process, the tapered portion 39
A concave spherical valve seat surface 43 as shown in FIG. 3 is formed on the valve seat surface 43 . That is, the ball (
The steel ball) itself is used as a jig for forming the valve seat surface 43,
By punching the spherical valve body 13, a concave spherical valve seat surface 43 is formed on the tapered portion 39. As a result, a concave spherical valve seat surface 43 that follows the convex spherical shape of the spherical valve body 13 is accurately formed on the tapered portion 39 . At this time, the spherical valve body 13 is formed of a steel ball, and the housing 11
is made of aluminum, so the spherical valve body 1
3 will not be damaged.

Next, as shown in FIG. 4, the outlet side of the fuel discharge passage 15 is closed with a suitable closing member 46, and the rib 40 of the diaphragm 12 is closed with a vacuum suctioned from the fuel intake port 14. The diaphragm unit 4 is placed so as to fit into the annular groove 41 of the housing 11 . At this time, since the inside of the housing 11 is depressurized, the diaphragm 12 of the diaphragm unit 4 comes into close contact with the flange portion 9 of the housing 11, thereby preventing displacement.

The diaphragm unit 44 is a unit in which the receiver 23 and the support plate 24 are fixed to the diaphragm 12, and the return spring 25 is fixed to the support plate 24, and is assembled in advance in a separate process. .

Next, as shown in FIG. 5, the case 21 is mounted on the flange portion 19 of the housing 11 to which the diaphragm unit 44 is attached.
It is covered from above.

Subsequently, the open end side end of the case 21 is caulked radially inward, and the case 21 is attached to the housing 1.
It is fixed to the flange portion 19 of 1.

In the step of covering the case 21 and the crimping step, the rib 40 of the diaphragm 12 is fitted into the annular groove 41 of the housing 11 by vacuum suction from the fuel inlet 14, so that the diaphragm 12 is attracted to the flange portion 19. Since the case 21 is covered and crimped in this state, the elastic force of the valve spring 18 is prevented from acting on the diaphragm 12 during the covering and crimping operations. As a result, the diaphragm 12
It is possible to prevent the occurrence of the phenomenon of being caught between the flange portion 19 and the flange portion 19, and caulking can be performed in a stable state.

After the case 21 is fixed to the housing 11 as described above, the vacuum suction is stopped. and,
As shown in phantom in FIG.
A jig 45 is applied to the first seat surface 32 of the housing 11 and the second seat surface 34 of the boss portion 33, and the pipe pressure inlet 15a of the housing 11 is
The return pipe 17 is press-fitted into.

At this time, the reaction force accompanying the press-fitting of the pipe acts on the jig 45 via the first seat surface 32 and the second seat surface 34, so that the stress when press-fitting the return pipe 17 acts on the diaphragm 12, etc. Doing so will be avoided. For this reason, the case 21 is attached to the flange portion 1 of the housing 11.
Even if the return pipe 17 is press-fitted into the pipe inlet 15a of the housing 11 after being fixed to the diaphragm 9, the set pressure set in the diaphragm 12 can be prevented from changing.

It goes without saying that the present invention is not limited to the above-mentioned embodiments, and can be modified in various ways without departing from the spirit thereof.

For example, although the method for manufacturing a fuel pressure control valve has been described in the above embodiment, the present invention can be applied to all methods for manufacturing pressure control valves used for other purposes.

[0031]

[Effects of the Invention] As explained above, according to the present invention,
Using the spherical valve body itself as a jig for forming the valve seat surface, punch the spherical valve body to form a concave spherical valve seat surface that imitates the convex spherical surface of the spherical valve body at the spherical valve body attachment part of the fluid discharge path. With this configuration, it is possible to extremely easily form a concave spherical valve seat surface that accurately follows the convex spherical shape of the spherical valve body.

[0032] Furthermore, since the jig for forming the valve seat surface can be eliminated, consideration for the jig for forming the valve seat surface can be omitted, increasing productivity and promoting cost reduction. can be done.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing a step of inserting a valve spring and a spherical valve body in a method of manufacturing a fuel pressure control valve according to an embodiment of the present invention.

FIG. 2 is a side cross-sectional view showing a valve seat surface forming process.

FIG. 3 is an enlarged partial cross-sectional view showing the valve seat surface after formation.

FIG. 4 is a side cross-sectional view showing a diaphragm unit assembly process.

FIG. 5 is a side cross-sectional view showing a caulking process.

FIG. 6 is a side sectional view showing the manufactured fuel pressure control valve.

FIG. 7 is a side sectional view showing the housing.

FIG. 8 is a rear view of the housing.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10... Fuel pressure control valve, 11... Housing, 12... Diaphragm, 13... Spherical valve body (steel ball, ball), 14... Fuel introduction path, 15... Fuel discharge path, 15a... Pipe pressure inlet,
16...Control valve chamber, 17...Return pipe, 18...Valve spring, 19...Flange part, 20...Atmospheric chamber, 21...
Case, 22... Holding hole, 23... Receiver, 24... Support plate,
25... Return spring, 26... Flange portion, 27...
Through hole, 28, 29...Mounting hole, 30...Connection port, 31...
Retaining ring portion, 32...first seat surface, 33...boss portion, 34...
2nd seat surface, 35... Pole part, 36... Diaphragm attachment opening, 37... Spherical valve body attachment part, 38... Valve spring attachment part, 39... Taper part, 40... Rib, 41... Annular groove, 42... Fixing tool, 43... valve seat surface, 44... diaphragm unit, 45... jig, 46... closing member.

Claims (1)

[Claims] Claim 1: A housing that forms a control valve chamber together with a diaphragm has a fluid introduction passage and a fluid discharge passage that communicate with the control valve chamber, and a spherical valve body that interlocks with the diaphragm is provided on the inlet side of the fluid discharge passage. A pressure system in which a spherical valve body mounting part is formed, the spherical valve body mounting part is formed at a position facing the diaphragm mounting opening of the housing, and a pipe pressure inlet is formed on the outlet side of the fluid discharge path. In the method for manufacturing a control valve, an elastic member for applying a biasing force to the spherical valve body is inserted into the fluid discharge passage from the diaphragm mounting opening side of the housing, and then the spherical valve body is inserted into the spherical valve body of the fluid discharge passage. The spherical valve element is inserted into the valve body mounting part, and a pressing force is applied to the spherical valve body from the diaphragm mounting opening side of the housing to punch the contact surface of the spherical valve body mounting part with the spherical valve body, and by this punching, the spherical valve body A method of manufacturing a pressure control valve, characterized in that a concave spherical valve seat surface is formed on a contact surface of a mounting portion with a spherical valve body.