JPH07108514B2 - Ball plug press-fitting method and ball plug press-fitting machine for closing a passage in a fluid passage of a fluid control device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carburetor for supplying an air-fuel mixture to an internal combustion engine, a fuel pump for pumping fuel to the carburetor, and further for pumping lubricating oil to the carburetor or engine. Method for press-fitting a ball plug into a fluid passage of a ball plug for closing a fluid passage such as a fuel passage, an oil passage, and an air passage formed in a fluid control device such as an oil pump, and a plug for implementing the method Regarding press-fitting machine. The press-fitting of the ball plug for closing the passage is used when the passage is closed or the passage is used as a single fluid passage.

[0002]

2. Description of the Related Art Conventionally, a method of press-fitting a ball plug for blocking a passage in a fluid passage of a generally used fluid control device is to mount the ball plug on a ball plug mounting jig arranged at the tip of an air cylinder, By pressurizing the air cylinder, the air cylinder including the ball plug mounting jig advances toward the fluid passage of the fluid control device, and the ball plug mounted on the ball plug mounting jig is suddenly moved to the fluid passage with a large impact force. It is pressed into the passage opening.

[0003]

According to such a conventional ball plug press-fitting method for closing a passage, the ball plug is pressed into the passage opening of the fluid passage of the fluid control device at once, and at this time, the ball plug mounting jig is installed. When the shaft center of the tool and the ball plug (including the air cylinder) and the passage center of the opening of the fluid passage formed in the fluid control device are displaced from each other, the ball plug is concentric with the fluid passage. It is difficult to be press-fitted, so that there is a possibility that a uniform tightening margin cannot be obtained over the entire circumference of the ball plug, the press-fitting load of the ball plug is reduced, and the airtightness at the opening of the fluid passage cannot be maintained well. Further, the fact that the ball plug cannot press the inner circumference of the fluid passage with a uniform load means that the eccentric side of the ball plug presses a part of the inner circumference of the fluid passage with a large pressing load. according to this,
The fluid control device may be deformed or cracked,
It is not preferable in manufacturing. The present invention has been made in view of the above problems, and improves the airtightness at the opening of the fluid passage and press fits the ball plug by concentrically inserting the ball plug into the opening of the fluid passage of the fluid control device. An object of the present invention is to provide a ball plug press-fitting method for a fluid passage in which a fluid control device is less deformed by a process, and a ball plug press-fitting machine suitable for carrying out the method.

[0004]

SUMMARY OF THE INVENTION A ball plug press-fitting method for closing a passage in a fluid passage of a fluid control device according to the present invention is a ball plug mounting jig provided at a tip of an air cylinder. First step of mounting the ball plug facing the fluid passage to be installed and with a gap to the fluid control device, and by pressing the air cylinder, the ball cylinder mounting jig of the air cylinder advances toward the fluid control device. The second step of placing the ball plug in a pressed state against the opening of the fluid passage of the fluid control device, and the rear end of the air cylinder in the moving direction of the air cylinder at least during the second step. A pressure piston that is movably opposed to the air cylinder is placed at the rear end of the air cylinder by applying pressure. Contacting the ball cylinder with the impact force, the third step of shock-pressing the ball plug into the fluid passage by using the ball plug mounting jig of the air cylinder, and the pressure applied to the air cylinder and the pressure piston. The fourth step is to remove and retreat the air cylinder and the pressure piston from the work by the elastic force of the elastic member, and form and hold a gap at least between the ball plug mounting jig of the air cylinder and the fluid control device. . The ball plug press-fitting method is provided with a ball plug mounting jig that is movably supported in a linear direction with respect to a gantry and that can mount a ball plug at its tip, and receives a supply of pressurized air to An air cylinder capable of moving the ball plug mounting jig including the plug toward the passage opening of the fluid control device and stopping the supply of the pressurized air to retract the ball plug mounting jig from the fluid control device. And a first pressurized air passage connecting the pressure receiving chamber of the air cylinder with the pressure source and a first atmosphere passage connecting the pressure receiving chamber with the atmosphere to selectively introduce pressurized air or the atmosphere into the pressure receiving chamber. The first control valve is arranged to face the rear end of the air cylinder and is movable along the moving direction of the air cylinder. -Abutting the rear end of the cylinder with impact force to shockly press the air cylinder toward the fluid control device, while removing the pressing force on the air cylinder when the supply of the pressurized air is stopped. The pressure piston to be obtained, the second pressurized air passage connecting the pressure receiving chamber of the pressure piston and the pressure source, and the second atmosphere passage connecting the pressure receiving chamber to the atmosphere are switched, and the pressurized air or the atmosphere in the pressure receiving chamber is switched. A second control valve for selectively introducing the air, a first elastic member having an elastic force that separates the tip of the air cylinder from the fluid control device, and a tip of the pressurizing piston that separates from the rear of the air cylinder. It is implemented by a ball plug press-fitting machine including a second elastic member having an elastic force.

[0005]

In the second step, the ball plug is placed in a pressed state with respect to the opening of the fluid passage of the fluid control device. At this time, the ball plug is pressed into the opening of the fluid passage at a stretch. Instead, the ball plug is concentric with the center of the fluid passage opening. Then
In the third step, the ball plug is press-fitted into the opening of the fluid passage by the air cylinder and the ball plug mounting jig that are moved by the impact force of the pressure piston. Thus, the ball plug can concentrically block the passage.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a ball plug press-fitting method and a ball plug press-fitting machine for closing a passage in a fluid passage of a fluid control device according to the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a mount of a ball plug press-fitting machine, which is a fluid control device W (fluid control device W) in which a fluid passage 24 is formed in the lower horizontal direction.
Is also called work. ) Is arranged, the side pillar 1B extends upward from the work mounting base 1A, and the arm portion 1C extends horizontally from the upper end of the side pillar 1B. The air cylinder support cylinder 2 is arranged on the arm 1C. An air cylinder hole 2A is vertically formed in the air cylinder support cylinder 2, an upper portion of the air cylinder hole 2A is opened to an upper end portion 2C of the air cylinder support cylinder 2 with a female screw 2B, and a lower portion of the air cylinder hole 2A is formed. It opens downward with a small diameter hole 2D. And the menesi 2 above the air cylinder hole 2A
A plug screw 3 having a through hole 3A formed in the vertical direction is screwed into B. 4 is an air cylinder,
It is formed by a piston 4A in the middle thereof, an upper shaft portion 4B extending upward from the piston 4A, and a lower shaft portion 4C extending downward, and the upper shaft portion 4B is movable in the through hole 3A of the plug screw 3. Are supported by the lower shaft portion 4 and project upward from the plug screw 3.
C is movably supported by the small diameter hole 2D and projects downward from the small diameter hole 2D. The upper end of the upper shaft 4B constitutes the rear end of the air cylinder 4, and the lower end of the lower shaft 4C constitutes the tip of the air cylinder 4. Reference numeral 5 is an O-ring made of rubber which is fitted and arranged in the piston 4A and keeps the piston 4A and the air cylinder hole 2A airtight. A pressure receiving chamber P1 of the air cylinder 4 is formed in the air cylinder hole 2A between the upper end 4D of the piston 4A and the lower end of the plug screw 3. At the tip of the air cylinder 4, in other words, at the lower end of the lower shaft 4C, a ball plug G is mounted, and a ball plug mounting jig 5 for press-fitting the ball plug G is mounted by a tightening nut or the like. The ball plug mounting jig 5 firstly holds the ball plug G in an attracted state, and uses, for example, a permanent magnet or a negative pressure. In this example, a negative pressure hole 5A is formed in the tip opening of the ball plug mounting jig 5, and a negative pressure is applied to the negative pressure hole 5A to attract the ball plug G to the negative pressure hole 5A. Also, the second
Has a pressing portion 5B for pressing the ball plug G, and the outer peripheral portion of the negative pressure hole 5A corresponds to this. Further, an air cylinder 4 (plug mounting jig 5 is provided between the flange portion 4E provided on the upper shaft portion 4B and the upper end 3B of the plug screw 3.
(Including) is separated from the fluid control device W. The first elastic member 6 made of a coil spring (moved upward) is contracted. On the other hand, the air cylinder support cylinder 2 has a first passage 7 communicating with the pressure receiving chamber P1, a first atmosphere passage 8 communicating with the atmosphere, and a first pressurized air passage 11 communicating with a pressure source 10 via a regulator 9. And each of these passages is
It is switched by the control valve 12. That is, when the first atmosphere passage 8 and the first passage 7 communicate with each other, the first pressurized air passage 11 and the first passage 7 are shut off from each other, and the first pressurized air passage 1
The first atmosphere passage 8 and the first passage 7 are cut off when the first passage 1 and the first passage 7 are in communication with each other. Thus, pressurized air and atmospheric pressure are selectively supplied into the pressure receiving chamber P1 of the air cylinder.

Reference numeral 13 is a pressure piston support cylinder having a pressure piston cylinder hole 13A penetrating in the vertical direction, and is arranged on the upper end 2C of the air cylinder support cylinder 2. A pressure piston 15 having a plurality of labyrinth grooves 14A formed on the outer periphery is movably disposed in the pressure piston cylinder hole 13A, and the pressure piston 15 is housed in the upper portion of the pressure piston cylinder hole 13A. The opening is closed by the cover 16. And pressurizing piston 1
5, the pressure receiving chamber P2 of the pressurizing piston 15 is formed by the recess 15A formed in 5 and the cover 16, and the tip end portion 15B (lower end in the figure) of the pressurizing piston 15 is at the rear end portion (upper shaft) of the air cylinder 4. The pressurizing piston 15 is opposed to the upper end of the portion 4B, and is further elastically urged in a direction away from the fluid control device W (upward in the drawing) by a second elastic member 17 formed of a coil spring. The cover 16 is provided with a second passage 18 communicating with the pressure receiving chamber P2 of the pressurizing piston 15, a second atmosphere passage 19 communicating with the atmosphere, and a second pressurized air passage 20 communicating with the pressure source 10.
The passages are switched by the second control valve 21. That is, when the second atmosphere passage 19 and the second passage 18 communicate with each other, the second pressurized air passage 20 and the second passage 18 are blocked, and the second pressurized air passage 20 and the second passage 18 communicate with each other. At times, the second atmosphere passage 19 and the second passage 18 are shut off. Thus, in the pressure receiving chamber P2 of the pressure piston,
Pressurized air and atmospheric pressure are selectively supplied. The first control valve 12 and the second control valve 21 in this embodiment are electromagnetic control valves that are operated by the magnetic force that occurs and disappears in the coil.

The electronic control unit 2 22 detects the position of the air cylinder 4 when the air cylinder 4 reaches a certain position below.
3 (hereinafter referred to as ECU) is a position sensor that outputs a signal to the E.C.U. C. U23 outputs a signal to the second control valve 21 to operate the second control valve 21 so that the second pressurized air passage 20 and the second passage 18 communicate with each other, and after a lapse of a certain time, the second pressurization The air passage 20 and the second passage 18 are shut off and the second passage
A signal for operating the second control valve 21 to connect the passage 18 and the second atmosphere passage 19 is output, while the first control valve 12 is output.
For a certain time, the first passage 7 and the first passage
A signal for operating the first control valve 12 so as to communicate with the atmosphere passage 19 and to shut off the first passage 7 and the first pressurized air passage 11 is output.

Next, a ball plug press-fitting method will be described. The first step is a step of mounting the ball plug G on the ball plug mounting jig 5, and is shown in FIG. Such first
In the process, a negative pressure is introduced into the negative pressure hole 5A from a negative pressure source (not shown). According to this, the ball plug G is sucked and held in the negative pressure hole 5A opened at the tip of the ball plug mounting jig 5. On the other hand, in the first control valve 12, the first passage 7 and the first atmosphere passage 8 are communicated with each other, the first passage 7 and the first pressurized air passage 11 are blocked and held, and the pressure of the air cylinder is received. The chamber P1 is maintained at atmospheric pressure. Therefore, the air cylinder 4 is urged upward by the elastic force of the first elastic member 6 and is in the upper position, and the ball plug G and the passage opening 24A of the fluid passage 24 to be bored in the fluid control device W are formed. A gap S1 is formed therebetween. On the other hand, in the second control valve 21, the second passage 18 and the second atmosphere passage 19 are communicated with each other, the second passage 18 and the second pressurized air passage 20 are shut off, and the pressure receiving chamber of the pressurizing piston is provided. P2 is kept at atmospheric pressure.
Thus, the pressure piston 15 is biased upward by the elastic force of the second elastic member 17 and is in the upper limit position. In this embodiment, the upper end of the upper shaft portion 4B of the air cylinder 4 is brought into contact with the lower end portion 15B of the pressure piston 15.

Next, the second step is a step of mounting the ball plug G on the passage opening 24A of the fluid passage 24 of the fluid control device W. In the second step, the first control valve 12 is electrically operated, the first passage 7 and the first pressurized air passage 11 are communicated with each other, and the first passage 7 and the first atmosphere passage 8 are cut off. (The second control valve 21 is held in the first process state) According to the above, the pressurized air in the pressure source 10 which is depressurized (for example, 3 Kg / square centimeter) by the regulator 9 is stored in the pressure receiving chamber P1 of the air cylinder. It is supplied through the first pressurized air passage 11 and the first passage 7. According to this, the air cylinder 4 gently moves down against the elastic force of the first elastic member 6, and the ball plug is mounted. The ball plug G mounted on the tip of the jig 5 is placed in a pressed state on the passage opening 24A of the fluid passage 24 of the fluid control device W. In this process, since the air pressure applied to the pressure receiving chamber P1 of the air cylinder is a small pressure, the ball plug G is not pressed into the fluid flow path 24, and the ball plug G does not move into the passage opening 24A of the fluid passage 24.
The center of the passage is automatically centered, and the fluid passage 24 is concentrically pressed and placed. On the other hand, in the pressurizing piston 15, since the pressure in the pressure receiving chamber P2 of the pressurizing piston 15 is still maintained at the atmospheric pressure, the pressurizing piston 15 is retained at the upper position by the second elastic member 17, The tip of the pressure piston 15 and the air cylinder 4
An upper end portion of the upper shaft portion 4B (a gap S2 between the rear end portion of the air cylinder 4) is formed and held. This state is shown in Figure 2.
Shown in.

Next, the third step is a step of press-fitting the ball plug G into the fluid passage 24 of the fluid control device W. At the end of the above-described second step (when the ball plug G is placed on the passage opening 24A of the fluid control device W),
The position sensor 22 detects that the air cylinder 4 is in the lower position and sends a signal to the E.C. C. Output to U23. When the E. C. U
23 drives the second control valve 21, and the second pressurized air passage 20
And the second passage 18 are communicated with each other, and the second atmosphere passage 19 and the second passage 18 are cut off. According to the above, the pressurized air (for example, 50 kg / square centimeter) of high pressure in the pressure source 10 is supplied into the pressure receiving chamber P2 of the pressurizing piston. The piston 15 suddenly shocks and moves downward against the elastic force of the second elastic member 17, and the tip portion 15B of the pressure piston 15 is moved.
Presses the upper end of the upper shaft portion 4B of the air cylinder 4. Thus, the air cylinder 4 in the state shown in FIG. 2 receives a downward pressing force, and the ball plug G
Is pressed into the fluid passage 24 of the fluid control device W by the pressing portion 5B at the tip of the ball plug mounting jig 5 to close the fluid passage 24. This is shown in FIG. Then, in the third step, when a predetermined time (for example, 3 seconds) elapses, the E.I. C. A signal is again output from the U23 to the second control valve 21, the second control valve 21 shuts off the second pressurized air passage 20 and the second passage 18, and the second passage 18 and the second atmosphere passage 19 are disconnected. Is communicated with the pressure receiving chamber P of the pressure piston.
2 is again held at atmospheric pressure. According to this, the pressurizing piston 15 returns to the upper position again by the elastic force of the second elastic member 17. On the other hand, after a certain period of time has passed,
E. C. A signal is also output from the U23 to the first control valve 12, and according to this, the first control valve 12 is
The pressurized air passage 11 and the first passage 7 are shut off, the first atmosphere passage 8 and the first passage 7 are communicated with each other, and the inside of the pressure receiving chamber P1 of the air cylinder is maintained at the atmospheric pressure again. Thus, the air cylinder 4 is returned to the upper position by the elastic force of the first elastic member 6, and the air cylinder 4 and the pressurizing piston 15 are returned to the state shown in FIG. With the above, the work of closing the fluid passage 24 with the ball plug G is completed. still,
In the present embodiment, the first control valve 12 and the second control valve 21 are used as electromagnetic control valves in the E. C. Although the operation is controlled by U, the structure of the control valve and the control method thereof are not limited.

[0012]

According to the present invention, the following effects can be obtained. Particularly, in the second step, since the ball plug is placed in a pressed state against the passage opening of the fluid passage of the fluid control device, the centripetal action of the ball plug causes the ball plug to move toward the center of the fluid passage. The ball plugs can be arranged concentrically, and in the third step, the ball plug in the above state is press-fitted into the fluid passage by impacting the pressurizing piston, so that the ball plug is concentric with the fluid passage. The ball plug can be press-fitted into the fluid passage and the load of press-fitting the ball plug into the fluid passage can be made uniform over the entire circumference of the ball plug. Therefore, the blockage of the ball plug can be improved and the fluid control device can be deformed or cracked. It was possible to achieve a significant improvement in the productivity of press-fitting the ball plug. In addition, the fact that the pressure applied to the pressurizing piston is larger than the pressure applied to the air cylinder allows the press-fitting work of the ball plug by the pressurizing piston to be performed reliably, and the ball presses by the air cylinder by the small pressurizing force. The plug can be placed in the opening of the fluid passage, which allows the ball plug to be arranged concentrically with the fluid passage. Further, since the ball plug press-fitting machine is constituted by the air cylinder, the first control valve, the pressurizing piston, the second control valve, the first elastic member and the second elastic member, the ball plug press-fitting method becomes extremely compact. It was achieved by the structure.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of essential parts showing a ball plug press-fitting machine according to the present invention, showing a first process state.

FIG. 2 shows a second process state in FIG.

FIG. 3 shows a state of a third step in FIG.

[Explanation of symbols]

 2 Air cylinder support cylinder 4 Air cylinder 5 Ball plug mounting jig 6 First elastic member 12 First control valve 15 Pressurizing piston 21 Second control valve P1 Air cylinder pressure receiving chamber P2 Pressurizing piston pressure receiving chamber G Ball plug 17 Second elastic member W Fluid control device 24 Fluid passage 24A Fluid passage 24 passage opening

Claims (3)

[Claims] 1. A first step for mounting a ball plug on a ball plug mounting jig provided at the tip of an air cylinder so as to face a fluid passage to be bored in a fluid control device and leave a gap with respect to the fluid control device. By pressing the air cylinder, the ball plug mounting jig of the air cylinder is advanced toward the fluid control device, and the ball plug is placed in a pressed state against the opening of the fluid passage of the fluid control device. In the two steps, and at least in the second step, the pressure piston, which is movably opposed to the rear end of the air cylinder in the moving direction of the air cylinder with a gap, is pressed to apply pressure to the rear of the air cylinder. The ball plug is moved toward the end with impact force and abutted, and the ball plug mounting jig of the air cylinder is used to make the ball plug. The third step of shock-pressing the air into the fluid passage, removing the pressure applied to the air cylinder and the pressure piston, and retracting the air cylinder and the pressure piston from the work by the elastic force of the elastic member, and at least the air A ball plug press-fitting method for closing a passage in a fluid passage of a fluid control device, which comprises a fourth step of forming and maintaining a gap between a ball plug mounting jig of a cylinder and the fluid control device. 2. The ball plug press-fitting method for closing a passage in a fluid passage of a fluid control device according to claim 1, wherein the pressing force applied to the pressurizing piston is larger than the pressing force applied to the air cylinder. 3. A ball including a ball plug, which is movably supported in a straight line direction with respect to a gantry and has a ball plug mounting jig at its tip end capable of mounting a ball plug, and which receives supply of pressurized air. An air cylinder that can move the plug mounting jig toward the passage opening of the fluid control device and can retract the ball plug mounting jig from the fluid control device by stopping the supply of the pressurized air, and an air cylinder. Control for selectively introducing pressurized air or atmosphere into the pressure receiving chamber by switching between a first pressurized air passage connecting the pressure receiving chamber and the pressure source and a first atmosphere passage connecting the pressure receiving chamber and the atmosphere. It is arranged to face the valve and the rear end of the air cylinder and to be movable along the moving direction of the air cylinder. A pressurizing piston capable of abutting with an impact force toward the air cylinder to shockly press the air cylinder toward the fluid control device, while removing the pressing force to the air cylinder when the supply of the pressurized air is stopped, A second pressurized air passage that connects the pressure receiving chamber of the pressure piston and the pressure source and a second atmosphere passage that connects the pressure receiving chamber and the atmosphere are switched to selectively introduce pressurized air or atmosphere into the pressure receiving chamber. A second control valve, a first elastic member having an elastic force that separates the tip of the air cylinder from the fluid control device, and a second elastic member that has an elastic force that separates the tip of the pressurizing piston from the rear end of the air cylinder. A ball plug press-fitting machine including an elastic member.