JP3233014B2 - Manufacturing method of check 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 method for manufacturing a check valve, and more particularly to a method for manufacturing a check valve suitable for easily manufacturing a check valve having stable quality.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Unexamined Utility Model Publication No.
As disclosed in No. 7, a check valve using a ball is known. The above-described conventional check valve includes an external member that includes a ball. At one end of the external member, a seat surface that functions as a valve seat for a ball is formed together with a through hole that communicates with the fluid passage. Further, at the other end of the external member, a retaining portion for preventing the ball from falling off is formed. The retaining portion is formed by bending an end of the external member inward.

According to the above configuration, when a fluid pressure acts in a direction to separate the ball from the through hole side of the housing, the ball separates from the seat surface. As a result, the flow of the fluid from the through hole side to the retaining portion side is allowed. At this time, since the retaining portion is formed at the end of the housing, the ball does not fall off the external member. On the other hand, when the fluid pressure acts in the direction in which the ball is seated from the ball retaining portion side, the ball sits on the seat surface. As a result, the flow of the fluid from the retaining portion side to the through hole side is prevented.

[0004]

In the above-mentioned conventional check valve, the ball retaining portion is formed by bending one end of the external member inward as described above. According to this method, the retaining portion can be formed extremely easily, and the check valve can be manufactured with excellent productivity.

[0005] However, if the retaining portion is formed by bending the end portion of the external member as described above,
The stress resulting from the bending is transmitted to the sheet surface, and the sheet surface may be deformed. If the seat surface is deformed in this way, sufficient adhesion between the seat surface and the ball cannot be obtained, and the check valve may malfunction. In this regard, the conventional manufacturing method of forming the ball retaining portion by bending the end of the external member is not always the optimal manufacturing method for providing a check valve with stable quality.

The present invention has been made in view of the above points, and has as its object to provide a method of manufacturing a check valve capable of easily manufacturing a check valve having stable quality.

[0007]

The above object is achieved by the present invention.
As described in the first step of forming a sheet surface for cutting off the communication of the flow path by contact with the ball inside the external member that contains the ball, and inside the external member, A second step of inserting a pressing jig having a spherical portion at an end thereof, and causing the ball to abut against the seat surface with a predetermined load by the pressing jig; And a third step of applying a force to the outer shape member in a state where the outer shape member is in contact with the check valve.

In the present invention, in the first step, a sheet surface is formed inside the external member. The seat surface is formed such that a sufficient sealing property is ensured when the ball is seated. In the second step, the ball is brought into contact with the seat surface. In this case, the seat surface and the ball abut with sufficient adhesion. In the third step, a force is applied to the external member while maintaining the close contact between the ball and the seat surface. The force acting on the external member is also transmitted to the vicinity of the sheet surface. Since the ball is in contact with the seat surface, the above-described force does not cause deformation near the seat surface that deteriorates the adhesiveness between the seat surface and the ball.

[0009] The object of the present invention is as described in claim 2.
2. The method of manufacturing a check valve according to claim 1, wherein the third step comprises bending the end of the external member inward while the ball is in contact with the seat surface by the pressing jig. This is also achieved by a method of manufacturing a check valve, which is a step of forming a retaining portion.

[0010] In the present invention, in the third step, an urging force is applied to the external member so as to bend its end inward. When the urging force is applied to the external member, a retaining portion is easily formed at an end of the external member. According to a third aspect of the present invention, in the method of manufacturing a check valve according to the second aspect, the third step includes a step in which the ball is brought into contact with the seat surface by the pressing jig. This is also achieved by a method of manufacturing a check valve having a step of press-fitting the external member into a housing.

In the present invention, in the third step, the external member is pressed into the housing. In the process of press-fitting the check valve into the housing, stress acts on the external member. This stress is also transmitted near the sheet surface. Since the ball is in contact with the seat surface, the above-mentioned stress does not cause deformation near the seat surface that deteriorates the adhesion between the seat surface and the ball.

According to a fourth aspect of the present invention, there is provided a method of manufacturing a check valve according to the third aspect, wherein, during the third step, the step of press-fitting the external member into the housing; The step of forming the retaining portion can also be achieved by a method of manufacturing a check valve in which a caulking press-fitting jig having both functions of press-fitting and caulking is used.

In the present invention, the process of press-fitting the external member into the housing and the process of forming the retaining portion on the external member are performed by the same jig. Therefore, these two
The two processes are performed substantially simultaneously in substantially the same process.

[0014]

FIG. 1 is a sectional view of a check valve 10 manufactured by a manufacturing method according to an embodiment of the present invention. The check valve 10 includes an external member 12. The outer member 12 has a small-diameter portion 14 and a large-diameter portion 16 formed therein. A ball 18 is housed inside the small diameter portion 14. One end of the small diameter portion 14 (upper end in FIG. 1)
Has a retaining portion 2 for preventing the ball 14 from falling off.
0 is formed. The retaining portion 20 is formed by bending an end of the small diameter portion 14 inward.

Inside the small diameter portion 14, a ball 18 is provided.
The seat surface 22 which functions as a valve seat of the vehicle is formed.
When the ball 18 is brought into contact with the seat surface 22,
It is formed so as to ensure a sufficient sealing property with the ball 18. At the center of the outer member 12, the large diameter portion 1
6 is formed in the axial direction, and a through-hole 24 is formed at the center of the sheet surface 22. The through hole 24 is provided for the ball 1
When the ball 8 is seated on the seat surface, the ball 18 is in a closed state, and when the ball 18 is separated from the seat surface, the ball 18 is in a conductive state.

The check valve 10 is used in a state where it is press-fitted into the fluid passage 26. The fluid passage 26 has a large-diameter portion 26a having an inner diameter substantially equal to the outer diameter of the large-diameter portion 16,
A small-diameter portion 26b having an inner diameter slightly smaller than the outer diameter of the large-diameter portion 16; The check valve 10 is pressed into the large diameter portion 26a of the fluid passage 26 until one end of the large diameter portion 16 contacts the small diameter portion 26b of the fluid passage 26.

The check valve 10 is connected to the fluid passage 26 as described above.
In this case, a sufficient sealing property is secured between the outer wall of the external member 12 and the inner wall of the flow passage 26. Therefore, the fluid does not flow between the external member 12 and the flow passage 26. According to such a configuration, when a fluid pressure is generated in the fluid passage 26 in a direction in which the ball 18 is seated on the seat surface 22, the through hole 24 is closed to prevent the flow of the fluid. On the other hand, when a fluid pressure is generated in the fluid passage 26 in a direction to separate the ball 18 from the seat surface 22, the through hole 24 is in a conductive state, and the fluid is allowed to flow.

The check valve 10 is connected to the fluid passage 26
During the press-fitting process, a radial compressive stress acts on the external member 12. Therefore, if the vicinity of the seat surface 22 does not have sufficient rigidity against the compressive stress, the seat surface 22 is deformed in the process of press-fitting the check valve 10, and the close contact between the seat surface 22 and the ball 18 is caused. A situation may occur in which the performance deteriorates.

However, according to the check valve 10,
The compressive stress generated when the check valve 10 is press-fitted acts only on the large-diameter portion 16 having a sufficient wall pressure and a sufficient rigidity. Therefore, the seat surface 22 is not unduly deformed due to the compressive stress generated when the check valve 10 is press-fitted. Therefore, according to the check valve 10, the fluid passage 26
The ball 1 does not change before and after being pressed into the inside of the ball 1
8 and the sealing surface 22 can maintain excellent adhesion.

In the check valve 10, the retaining portion 20 of the ball 18 is formed by bending one end of the small diameter portion 14 as described above. The small diameter portion 14 has a relatively thin wall pressure unlike the large diameter portion 16. For this reason, when bending processing is performed on one end of the small-diameter portion 14, deformation is likely to occur not only at the one end of the small-diameter portion 14 but also near the seat surface 22.

If deformation occurs in the vicinity of the seat surface 22 in the process of forming the retaining portion 20, a situation may occur in which the sealing required for the check valve 10 cannot be sufficiently ensured. Therefore, in order to ensure stable quality in the check valve 10, it is necessary to form the retaining portion 20 without causing undue deformation of the seat surface 22. FIG.
Is characterized in that it is manufactured by a manufacturing method that can satisfy such requirements.

Hereinafter, a method of manufacturing the check valve 10 will be described with reference to FIGS. FIG. 2 shows a state of the check valve 10 after the first step of the manufacturing method according to the present embodiment is completed. In the manufacturing method according to the present embodiment, the sheet surface 22 and the through hole 24 are formed in the external member 12 in the first step. The through hole 24 is formed by machining.
In addition, the sheet surface 22 is formed by forming a tapered surface by machining, and then punching the tapered surface to plastically deform the tapered surface into a desired shape.

When the processing in the first step is completed, the outer member 12 is moved to the sheet surface 22 in order to execute the processing in the second step and thereafter.
After the ball 22 is disposed on the upper part of the table, it is set below the caulking jig 30 and the pressing jig 32 as shown in FIG. The caulking jig 30 is an annular member, and the outer member 1
A curved surface portion 30a is provided at a portion opposing the upper end portion of the second. The pressing jig 30 has a spherical portion 32a at its lower end.
And is disposed at the center of the caulking jig 30 so as to be located directly above the ball 18.

FIG. 3 shows a state of the check valve 10 after the second step of the manufacturing method of the present embodiment is completed. In the manufacturing method of this embodiment, in the second step, a predetermined load F is applied to the ball 18 from the pressing jig 32. At the lower end of the pressing jig 32, the spherical portion 32a is formed as described above. For this reason, the pressing jig 32a can transmit a predetermined load F to the ball 32 while maintaining a stable state. When the load F is applied to the ball 18, the ball 18 and the seat surface 22 are kept in close contact with each other due to the load F.

FIG. 4 shows the state of the check valve 10 after the third step of the manufacturing method of this embodiment has been completed. In the manufacturing method of the present embodiment, in the third step, the load F is applied to the ball 18.
The outer member 12 formed by the caulking jig 30 is
Is bent. As described above, the caulking jig 30 includes the curved surface portion 30 at a position opposing the upper end portion of the external member 12.
a is formed. Therefore, when the swaging jig 30 is displaced toward the external member 12 as shown in FIG.
The upper end of 2 is bent along the curved surface 30a.
As a result, a retaining portion 20 that is bent inward to prevent the ball 18 from dropping is formed at the upper end portion of the external member 12.

As described above, the bending of the retaining portion 20 is performed by the ball 1 in the third step of the manufacturing method of this embodiment.
8 is performed in a state where the load F is applied, that is, in a state where the ball 18 and the seat surface 22 are urged in the close contact direction. When the ball 18 and the seat surface 22 are urged in the close contact direction in this manner, the adhesion between the ball 18 and the seat surface 22 deteriorates on the seat surface 22 in the process of bending the retaining portion 20. Such deformation does not occur. For this reason, according to the manufacturing method of the present embodiment, in the process of forming the retaining portion 20 at the end of the external member 12, deformation that deteriorates the adhesion between the ball 18 and the seat surface 22 is prevented. , Can be effectively prevented.

As described above, if it is possible to prevent the seat surface 22 from being unduly deformed in the process of forming the retaining portion 20, stable quality of the check valve 10 can be ensured. Therefore, according to the manufacturing method of this embodiment, the check valve 10 having stable quality can be easily manufactured.

By the way, in the above embodiment, the second
In addition, as a method of bringing the ball 18 into contact with the seat surface 22 in the third step, a method of applying a load to the ball 18 by the pressing jig 32 is employed, but the present invention is not limited to this. For example, the balls 18 may be brought into contact with each other by pressing the balls 18 against the seat surface 22 by fluid pressure or by sucking the balls 18 toward the seat surface 22 by negative pressure.

Next, with reference to FIGS. 5 to 7, a description will be given of a check valve manufacturing apparatus for executing the above-described manufacturing method. FIG. 5 is an overall configuration diagram of a check valve manufacturing apparatus. The manufacturing apparatus shown in FIG.
0 is provided. The work table 40 has the outer member 1
A check valve holding portion 42 having an inner diameter substantially equal to the outer diameter of the second large diameter portion 16 is formed. Check valve holder 4
2, the outer member 12 is set. External member 12
In the first step, the seat surface 22 is formed in the first step, and after that, the ball 18 is set on the seat surface 22 and then set on the check valve holding portion 42.

The work table 40 also has a support 44
The pressurizing device 46 is fixed via. Pressurizing device 46
, A caulking jig 48 is fixed. Pressurizing device 46
Can apply a downward load in FIG. 5 (hereinafter simply referred to as downward) to the caulking jig 48. The caulking jig 48 is located at the upper displacement end as shown in FIG. 5 when the pressing device 46 does not generate a load. On the other hand, when the pressing device 46 generates a load, it can be displaced downward by a predetermined length.

The caulking jig 48 is a cylindrical member whose lower end is an open end. At the lower end portion of the caulking jig 48, the curved surface portion 30 shown in FIGS.
A curved surface portion 48a similar to a is formed. A piston 50 and a spring 52 are provided inside the caulking jig 48. Further, a piston stopper 54 is fixed to the inner wall of the caulking jig 48.

The piston 50 can slide inside the caulking jig 48 in the axial direction, that is, in the vertical direction. The spring 52 urges the piston 50 toward the piston stopper 54. Therefore, when the external force acting on the piston 50 is only the urging force of the spring 52,
The piston 50 is held at a position where it contacts the piston stopper 54.

Below the piston 50, a pressing jig 56 is fixed. The pressing jig 56 is disposed at a position corresponding to the center of the caulking jig 48 similarly to the pressing jig 32 shown in FIGS. 2 to 4, and has a curved surface portion 56 a at the lower end thereof. Have. The position of the caulking jig 48 is set such that the curved surface 48a of the caulking jig 48 opposes the upper end of the external member 12 set on the check valve holding portion 42.
The lower end of the pressing jig 56 is adjusted so as to be located directly above the ball 18 disposed on the seat surface 22.

FIG. 6 shows a state where the second step of the manufacturing method of the present invention is being executed by the manufacturing apparatus shown in FIG.
As described above, the caulking jig 48 can be displaced downward when the pressing device 46 generates a load. When the caulking jig 48 is displaced downward by a predetermined length from the state shown in FIG. 5, the curved surface portion 48a of the caulking jig 48 is
The pressing jig 56 contacts the ball 18 before contacting the upper end of the ball 18.

After the pressing jig 56 contacts the ball 18,
When the displacement of the caulking jig 48 is further continued, the pressing jig 5
Since only the displacement of the caulking jig 48 increases without increasing the displacement of the piston 6 and the piston 50, the spring 52 undergoes elastic deformation in the contracting direction as shown in FIG. When the piston 50 is displaced upward relative to the caulking jig 48 as shown in FIG.
The contact with is released.

Therefore, under such circumstances, the spring 5
2 are transmitted to the ball 18. as a result,
A spring 52 is provided between the ball 18 and the seat surface 22.
The load F acts according to the amount of reduction of. As described above, according to the manufacturing apparatus described above, in the process in which the caulking jig 48 is displaced from the upper side displacement end to the lower side displacement end, a state to be realized by the second step of the manufacturing method of the present invention is realized. can do.

FIG. 7 shows a state where the third step of the manufacturing method of the present invention is being executed by the manufacturing apparatus shown in FIG.
When the caulking jig 48 is further displaced downward from the state shown in FIG. 6, while a downward load is applied to the ball 56,
Upper end of external member 12 and curved surface 48a of swaging jig 48
In other words, the outer member 12 can be bent so that the upper end of the outer member 12 is deformed following the curved portion 48a of the caulking jig 48.

Further, according to the manufacturing apparatus described above, in the process of bending the outer member 12, that is, in the process of changing the manufacturing apparatus from the state shown in FIG. 6 to the state shown in FIG. And the seat surface 22, the urging force of the spring 52 can be continuously applied. As described above, according to the manufacturing apparatus described above, in the process in which the caulking jig 48 is displaced from the upper displacement end to the lower displacement end, a state to be achieved by the third step of the production method of the present invention is realized. can do.

Further, the above-described manufacturing apparatus includes a caulking member 4
The upper end of the external member 12 is designed to be bent inward enough to form the retaining portion 20 when the lower end 8 reaches the lower displacement end. For this reason, according to the above-described manufacturing apparatus, by displacing the caulking jig 48 from the upper side displacement end to the lower side displacement end, the sheet surface 22
The retaining portion 20 can be formed at the upper end of the external member 12 without causing undue deformation.

As described above, according to the manufacturing apparatus shown in FIGS. 5 to 7, the first to third steps to be realized in the manufacturing method of the present invention can be sequentially realized. Therefore, according to the above manufacturing apparatus, the check valve 1 having stable quality is provided.
0 can be easily manufactured.

In the above-described embodiment, the sheet surface 22 is formed on the outer member 12 so as to achieve the above-described first aspect.
The first step according to claim 1, wherein the second step according to claim 1 is performed by applying an urging force to the ball 18 via the pressing jig 32 or 56. The third step according to the first and second aspects is realized by bending the outer member 12. By the way, in the present embodiment, the predetermined load is applied to the ball 1 in the process of bending the outer member 12.
It is desirable that the biasing force 8 is such that it does not move with respect to the seat surface 22.

Next, a second embodiment of the present invention will be described with reference to FIGS. In FIGS. 8 to 11, the same components as those shown in FIGS. 1 to 7 are denoted by the same reference numerals, and description thereof will be omitted. As described above, the check valve 10 is used while being pressed into the fluid passage 26. Therefore, finally, it is necessary to perform a process of press-fitting the external member 12 into the fluid passage 26. By the way, when the external member 12 is pressed into the fluid passage 26, the external member 12 is stably held inside the fluid passage 26.
The fluid passage 26 is similar to the work table 40 of the manufacturing apparatus shown in FIGS. 5 to 7 in that the fluid member 26 stably holds the external member 12 in this manner.

Therefore, if the external member 12 is press-fitted into the fluid passage 26 prior to forming the retaining portion 20, the desired shape can be accurately formed inside the fluid passage 26 using the method of the above-described embodiment. Can be formed. According to the formation of the retaining portion 20 after the external member 12 is pressed into the fluid passage 26 in this manner, the inconvenience that the sealing performance between the ball 18 and the seat surface 22 is impaired after the check valve 10 is completed. It can be avoided reliably. In the method of manufacturing the check valve according to the present embodiment, the outer member 12 is connected to the fluid passage 2 in order to obtain the above-mentioned advantage.
It is characterized in that the retaining portion 20 is formed after being press-fitted into the groove 6.

FIG. 8 shows a state in which the external member 12 is fitted into the opening of the fluid passage 26. In the manufacturing method of this embodiment, the sheet surface 22 is formed on the external member 12 in the first step. When the processing for forming the sheet surface 22 is completed, as shown in FIG.
Is set in the opening of the fluid passage 26 so as to fit into the large diameter portion 26a.

A press-fitting jig 60 is provided above the external member 12. The press-fitting jig 60 is provided with the small-diameter portion 1 of the external member 12.
4 is provided, and has a cylindrical portion 60a that abuts the large diameter portion 16 of the external member 12 at the lower end thereof. The cylindrical portion 60a is formed to have a slightly smaller diameter than the large diameter portion 26a of the fluid passage 26. When the press-fitting jig 60 is disposed on the upper part of the external member 12, a downward force in FIG. 8 is applied to the press-fitting jig 60 thereafter.

FIG. 9 shows a state after the external member 12 has been pressed into the fluid passage 26. When a downward force is applied to the press-fitting jig 60 as described above, the external member 12 is displaced toward the inside of the fluid passage 26. And the outer member 1
2 is continued until the bottom surface of the outer member 12 contacts the step between the large diameter portion 26a and the small diameter portion 26b of the fluid passage 26. After the state shown in FIG. 9 is formed, the press-fitting jig 60 is pulled out of the fluid passage 26 thereafter.

When the above process is completed, next, a process for forming the retaining portion 20 at the end of the external member 12 inside the fluid passage 26 is executed. FIG.
2 shows a state in which the ball 18 is disposed on the second sheet surface 22 and a caulking jig 48 is disposed above the external member 12. The position of the caulking jig 48 is adjusted such that the curved surface portion 48 a of the caulking jig 48 faces the upper end of the outer member 12 and the lower end of the pressing jig 56 is located directly above the ball 18. I have.

When the state shown in FIG. 10 is formed, a downward force in FIG. 10 is applied to the caulking jig 48. As described above, when the caulking jig 48 is displaced downward from immediately above the external member 12, a state in which a predetermined load is transmitted from the pressing jig 56 to the ball 18 in a short time, that is, the second method of the manufacturing method of the present invention The state to be realized is formed by the process. When the displacement of the caulking jig 48 is further continued, the upper end of the external member 12 is deformed following the curved surface portion 48a of the caulking jig 48, that is, realized by the third step of the manufacturing method of the present invention. Is formed.

As described above, according to the manufacturing method of the check valve of the present embodiment, after the external member 12 is pressed into the fluid passage 26, the adhesion between the seat surface 22 and the ball 18 can be appropriately reduced without deterioration. The retaining portion 20 can be formed. Therefore, according to the check valve manufacturing method of the present embodiment, the check valve 10 having stable quality can be realized inside the fluid passage 26.

Next, a third embodiment of the present invention will be described with reference to FIGS. In FIGS. 12 and 13, the same components as those shown in FIGS. 1 to 11 are denoted by the same reference numerals, and description thereof will be omitted. As described above, the large-diameter portion 16 of the outer member 12 is provided with a sufficient thickness to prevent deformation near the sheet surface 22 when the outer member 12 is pressed into the fluid passage 26. . For this reason, in the above-described embodiment, the process of press-fitting the outer member 12 into the fluid passage 26 is performed by the seat surface 22.
This is performed without considering the deformation in the vicinity.

By the way, in the process of press-fitting the external member 12 into the fluid passage 26, the ball 18 is
If the outer member 12 is pressed against the fluid passage 2
The deformation occurring in the vicinity of the seat surface 22 in the process of press-fitting the sheet 6 can be suppressed to a smaller extent. The method of manufacturing the check valve according to the present embodiment is characterized in that an appropriate load is applied to the ball 18 when the external member 12 is pressed into the fluid passage 26 in order to obtain the above advantage. are doing.

FIG. 12 shows that the press-fitting jig 70 disposed above the external member 12 fitted in the opening of the fluid passage 26
FIG. 13 illustrates a state in which the actuator is displaced downward by a predetermined length in FIG. 12. The press-fitting jig 70 holds the ball 1 above the seat surface 22.
After 8 is set, it is arranged above the external member 12.

The press-fitting jig 70 has a cylindrical portion 70a whose lower end is an open end. A piston 72 and a spring 74 are provided inside the cylindrical portion 70a. A piston stopper 76 is fixed to the inner wall of the cylindrical portion 70a. A pressing jig 78 is fixed below the piston 72. The piston 72, the spring 74, the piston stopper 76, and the pressing jig 7
8 functions in the same manner as the piston 50, the spring 52, the piston stopper 54, and the pressing jig 56 included in the above-described caulking jig 48, respectively.

As shown in FIG. 12, when the pressing jig 70 is displaced downward by a predetermined length, the pressing jig 78
Contact 8 In this state, the cylindrical portion 70a is
It is designed such that a gap remains between the tip of the outer member 12 and the outer end member 12a. From this state, the press-fitting jig 70
Is continued, the press-fitting jig 70 continues to be displaced relative to the external member 12 until the tip of the cylindrical portion 70a contacts the external member 12. Then, when the displacement of the press-fitting jig 70 is further continued after the distal end of the cylindrical portion 70 a contacts the external member 12, the external member 12 starts to be displaced into the fluid passage 26.

FIG. 13 shows a state after the external member 12 has been pressed into the fluid passage 26. The displacement of the external member 12 is continued until the bottom surface of the external member 12 contacts the step between the large-diameter portion 26a and the small-diameter portion 26b of the fluid passage 26, as shown in FIG. When such a state is formed, the press-fitting jig 70 is pulled out of the fluid passage 26 thereafter.

In the process of press-fitting the external member 12 into the fluid passage 26, the state where the tip of the cylindrical portion 70a contacts the external member 12 is realized by the elastic deformation of the spring 74 having a predetermined length. Further, if a predetermined length of elastic deformation occurs in the spring 74, the piston 72 and the pressing jig 78
, A biasing force resulting from the elastic deformation is transmitted. The urging force is transmitted to the ball 18 via the pressing jig 78 while the external member 12 is displaced inside the fluid passage 26.

The above-mentioned urging force acting on the ball 18 causes deformation in the vicinity of the seat surface 22 of the external member 12 in the process of press-fitting the external member 12 into the fluid passage 26 so as to deteriorate the sealing performance with the ball 18. To prevent For this reason, according to the manufacturing method of the present embodiment, it is possible to reliably avoid the problem that the sealing performance between the ball 18 and the seat surface 22 is deteriorated when the external member 12 is press-fitted.

In this embodiment, after the press-fitting process of the outer member 12 is completed, the retaining portion 20 is formed by the method shown in FIGS. 10 and 11 as in the second embodiment. . As a result, inside the fluid passage 26,
The check valve 10 having stable quality is realized.

In the above-described embodiment, the sheet surface 22 is formed on the external member 12 so as to achieve the above-described first aspect.
The first step according to claim 1, wherein the urging force of the springs (52, 74) is transmitted to the ball (18) via the pressing jigs (56, 78), respectively. The third member according to claim 1, wherein an external force is applied to the external member by the press-fitting jig and the press-fitting jig.
Each process is realized.

Further, in the above-described embodiment, the third step according to claim 2 is performed by bending the outer member 12 with the caulking jig 48, and the caulking jig 4
The third process according to the third aspect is realized by performing the press-fitting process of the external member 12 using the press-fitting jig 70 together with the bending process by using the fluid passage 26. The described housing is realized.

Next, a fourth embodiment of the present invention will be described with reference to FIGS. 14 through FIG.
In FIG. 6, the same components as those shown in FIGS. 1 to 13 are denoted by the same reference numerals, and description thereof will be omitted.
The manufacturing method of the above-described third embodiment uses the caulking jig 48 and the press-fitting jig 70 to perform the bending process on the outer member 12 and the press-fitting process. It is characterized in that a predetermined load is applied to the. The manufacturing method of the present embodiment is characterized in that both of these processes are performed almost simultaneously by using the caulking press-fitting jig 80.

FIG. 14 shows a state in which a press-fitting jig 80 is disposed on the upper part of the external member 12 fitted in the opening of the fluid passage 26. The caulking press-fitting jig 80 is disposed above the outer member 12 after the ball 18 is set above the seat surface 22. The caulking press-fitting jig 80 includes a cylindrical portion 80a whose lower end is an open end. Cylindrical part 80
On the inner peripheral surface of a, a curved surface portion 80b is formed at a position above the lower end portion of the cylindrical portion 80a by a predetermined length.

A piston 82 and a spring 84 are provided inside the cylindrical portion 80a. In addition, the cylindrical portion 8
A piston stopper 86 is fixed to the inner wall of Oa. A pressing jig 88 is fixed below the piston 82. The piston 82, the spring 84, the piston stopper 86, and the pressing jig 88 are respectively provided with the piston 50 and the spring 5 of the caulking jig 48 described above.
2. It functions similarly to the piston stopper 54 and the pressing jig 56.

FIG. 15 shows a state where the caulking press-fitting jig 80 is displaced downward by a predetermined length from the position shown in FIG. When the caulking press-fitting jig 80 is displaced downward, the pressing jig 88 first contacts the ball 18 before the state shown in FIG. 15 is formed. In this state, a gap remains between the lower end of the cylindrical portion 80a and the outer member 12, and the curved surface portion 80b of the cylindrical portion 80a and the outer member 12 in this state.
It is designed so that a gap remains between the upper end of the slab.

From this state, the press-fitting jig 80 is further pressed.
Is continued, the gap between the curved surface portion 80b of the cylindrical portion 80a and the upper end of the external member disappears, and the caulking press-fitting jig 80
Is transmitted to the outer member 12 via the curved surface portion 80a. The cylindrical portion 80a
In this state, it is designed such that a gap remains between the lower end of the cylindrical portion 80a and the outer member 12.

When the displacement of the press-fitting jig 80 is further continued after the above-described state is formed, a deformation following the curved surface portion 80a starts to occur at the upper end of the outer member 12, and the outer member 12 Is displaced toward the inside of the fluid passage 26. As a result, the situation shown in FIG. 15 is formed. Since then
The deformation of the upper end of the outer member 12 is continued until the lower end of the caulking jig 80 comes into contact with the outer member 12. Also,
The displacement of the external member 12 is continued until the bottom surface of the external member 12 contacts the step between the large diameter portion 26a and the small diameter portion 26b of the fluid passage 26.

FIG. 16 shows that the lower end of the caulking press-fitting jig 80 is in contact with the outer member 12, and the bottom surface of the outer member 12 is in contact with the step between the large diameter portion 26 a and the small diameter portion 26 b of the fluid passage 26. Indicates the status. When the caulking press-fitting jig 80 is displaced to this state, the retaining member 20 having a desired shape is formed at the upper end of the external member 12, and the external member 12 is press-fitted to a predetermined position in the fluid passage 26. When such a state is formed, the swaging press-fitting jig 80 is thereafter pulled out of the fluid passage 26.

After the pressing jig 88 contacts the ball 18,
In the process of forming the situation shown in FIG.
The biasing force of spring 84 is transmitted to pressing member 8 via pressing member 88. This biasing force stably presses the ball 18 toward the seat surface 22 while the upper end portion of the outer member 12 is bent and the outer member 12 is pressed. I do. As a result, the check valve 10 having stable quality is realized inside the fluid passage 26.

As described above, according to the method of manufacturing the check valve of the present embodiment, the outer member 12 is inserted into the fluid passage 26 while the ball 18 is under a predetermined load by using the caulking press-fitting jig 80. The press-fitting process and the process of forming the retaining portion 20 at the upper end of the external member 12 with a predetermined load applied to the ball 18 can be performed substantially simultaneously in substantially the same process. Therefore, according to the check valve manufacturing method of the present embodiment, the check valve 10 having stable quality can be manufactured inside the fluid passage 26 with excellent productivity.

In the embodiment described above, the sheet surface 22 is formed on the outer member 12 so as to achieve the above-described first aspect.
2. The second step according to claim 1, wherein the urging force of the spring 84 is transmitted to the ball 18 via a pressing jig 88 in the first step.
By applying an external force to the external member 12, the third step according to claim 1 is realized. Furthermore, in the above-described embodiment, the third step according to claim 2 is performed by bending the outer member 12 by using the caulking press-fitting jig 80. By performing the press-fitting process, the third step of the third and fourth aspects is realized, and the fluid passage 26 realizes the housing of the third aspect.

[0071]

As described above, according to the first aspect of the present invention, the processing required for the external member can be performed without causing the deformation of the sheet surface that deteriorates the adhesion between the sheet surface and the ball. Can be applied. Therefore, according to the method of manufacturing a check valve according to the present invention, a check valve having stable quality can be easily manufactured.

According to the second aspect of the present invention, the retaining portion can be easily and reliably formed on the external member with a relatively small force. Therefore, according to the method of manufacturing a check valve according to the present invention, a check valve having stable quality can be easily manufactured.

According to the third aspect of the present invention, the external member can be pressed into the housing and the retaining member can be formed on the external member without deteriorating the adhesion between the seat surface and the ball. Therefore, according to the method for manufacturing a check valve according to the present invention, it is possible to easily manufacture a check valve having a stable quality in a form in use.

According to the fourth aspect of the present invention, the process of forming the retaining portion on the external member and the process of press-fitting the external member into the housing are performed substantially simultaneously in substantially the same process. Can be. Therefore, according to the method for manufacturing a check valve according to the present invention, a check valve having stable quality can be easily manufactured with excellent productivity.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a check valve manufactured by a manufacturing method according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a state of a check valve after a first step of a manufacturing method according to an embodiment of the present invention is completed.

FIG. 3 is a diagram showing a state of a check valve during execution of a second step of the manufacturing method according to one embodiment of the present invention.

FIG. 4 is a diagram illustrating a state of a check valve during execution of a third step of a manufacturing method according to an embodiment of the present invention.

FIG. 5 is a diagram illustrating a state in which a check valve after a first step is set in a manufacturing apparatus that executes the manufacturing method according to the present invention.

6 shows a state where the second step of the manufacturing method of the present invention is being executed by the manufacturing apparatus shown in FIG. 5;

7 shows a state where the third step of the manufacturing method of the present invention is being executed by the manufacturing apparatus shown in FIG. 5;

FIG. 8 is a view showing a state in which an external member is fitted into a fluid passage in the manufacturing method according to the second embodiment of the present invention.

FIG. 9 is a view showing a state after the external member is press-fitted into the fluid passage in the manufacturing method according to the second embodiment of the present invention.

FIG. 10 is a diagram showing a state of a check valve before a second step is executed in the manufacturing methods according to the second and third embodiments of the present invention.

FIG. 11 is a diagram illustrating a state of a check valve after the second and third steps are performed in the manufacturing method according to the second and third embodiments of the present invention.

FIG. 12 is a view showing a state in which an external member is fitted into a fluid passage in the manufacturing method according to the third embodiment of the present invention.

FIG. 13 is a view illustrating a state after the external member is press-fitted into the fluid passage in the manufacturing method according to the third embodiment of the present invention.

FIG. 14 is a view illustrating a state in which an external member is fitted in a fluid passage in the manufacturing method according to the fourth embodiment of the present invention.

FIG. 15 is a diagram illustrating a process in which a bending process and a press-fitting process are performed on an external member in the manufacturing method according to the fourth embodiment of the present invention.

FIG. 16 is a diagram illustrating a state of a check valve after a second step and a third step are executed in the manufacturing method according to the fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Check valve 12 Outer member 14 Small diameter part 16 Large diameter part 18 Ball 20 Retaining part 22 Seat surface 26 Fluid passage 30, 48 Caulking jig 30a, 48a, 80b Curved surface part 32, 56, 78, 88 Pressing jig 50 , 72, 82 Piston 52, 74, 84 Spring 60, 60 Press-in jig 70a, 80a Cylindrical portion 80 Caulking press-in jig

──────────────────────────────────────────────────続 き Continued on the front page (56) References JP-A-64-35181 (JP, A) JP-A-6-49868 (JP, U) JP-A-6-63968 (JP, U) 133169 (JP, U) Japanese Utility Model 377009 (JP, U) Japanese Utility Model 60-5159 (JP, Y2) Japanese Utility Model 54-35865 (JP, Y2) (58) Field surveyed (Int. ⁷ , DB name) F16K 15/00-15/20 F16K 27/00-27/12

Claims (4)

(57) [Claims] A first step of forming a seat surface for interrupting communication of a flow path by contact with a ball inside an external member containing a ball therein; Pressing jig with spherical portion at end
A second step of inserting the ball into the seat surface with a predetermined load by the pressing jig; and forming the outer shape in a state where the ball is brought into contact with the sheet surface by the pressing jig. A third step of applying a force to the member. A method for manufacturing a check valve, comprising: 2. The method of manufacturing a check valve according to claim 1, wherein in the third step, an end of the external member is inwardly placed in a state where the ball is brought into contact with the seat surface by the pressing jig. A method for manufacturing a check valve, comprising a step of forming a retaining portion by bending a check valve. 3. The method of manufacturing a check valve according to claim 2, wherein in the third step, the external member is pressed into a housing in a state where the ball is brought into contact with the seat surface by the pressing jig. A method for manufacturing a check valve, comprising the steps of: 4. The method of manufacturing a check valve according to claim 3, wherein, during the third step, the step of press-fitting the external member into the housing and the step of forming the retaining portion are performed by press-fitting.
A method for manufacturing a check valve, comprising using a caulking press-fitting jig having both functions of caulking .