JPH03294654A - Jig for assembling parts to be built in deep hole - Google Patents

Abstract

PURPOSE:To improve products in quality, yield and productivity wherein internal parts are assembled in the deep hole of a part main body by energizing a guide pin in such a way that one end section of the guide pin is projected out to the side at which the part main body on the working surface is rested. CONSTITUTION:A holder 3 is rested on the working surface 2 while the holder 3 of a constant residual pressure valve 1 is inserted into the inside of a positioning hole 16 provided over the upper surface 15 of a rest section 14. Under this condition, a guide pin 22 which is projected out while being energized by a spring 24, is projected into the inside of a deep hole 4. In this state, a coil spring 5, and a seat 6 and a ball 7 which are internal parts to be disposed inside, are inserted into the deep hole 4 in order from an opening hole, so that a plug body 8 is finally pressed in. In this case, the seat 6 is coupled in the end section 28 of the guide pin 22 the dent in the bottom surface of which is projected in the inside of the deep hole 4 before the seat comes in contact with the spring 5, so that it takes a proper attitude without being tilted. The seat is then moved together with the guide pin 22, so that it is accurately brought into an assembly position. Accordingly, the plug body 8 is thus completely pressed in, and the assembly of the constant residual pressure valve 1 is thereby accomplished.

Description

Detailed Description of the Invention Object of the Invention [Field of Industrial Application] The present invention relates to a jig for assembling a built-in component into a deep hole of a component body [prior art] ] Conventionally, when assembling built-in components into deep holes in the component body,
To assemble the parts, place the part body with a deep hole on the work surface of the jig, and after inserting or inserting the built-in parts into the deep hole, apply pressure, crimping, or final assembly. For example, a constant residual pressure valve 1 for a fuel injection pump, the almost completed cross section of which is shown in FIG. When assembling the parts, place the holder 3, which is the main part of the part, on the work surface 2 of the jig, and then insert the spring 5, which is a built-in part, into the deep hole 4.
The seat 6 and the bolt were inserted, and the stopper 8 was finally press-fitted to complete the assembly.[Problem to be Solved by the Invention] However, conventional parts assembly is not possible using a jig. In some cases, built-in components are left out of their proper position inside the deep hole of the component body, and then pressurized, press-fitted, or other actions are applied, resulting in a finished product, which tends to result in defective products and poor yields. There was a problem.

In the case of the constant residual pressure valve 1 described above as an example, for example, as shown in FIG. In some cases, the ball 7 was inserted and the stopper 8 was press-fitted, resulting in a completed product. In this case, the ball 7 inserted next to the tilted sheet 6 was also tilted and assembled out of the proper position. Therefore, the ball 7 does not function as a normal constant residual pressure valve that can achieve the purpose of closing the passage hole of the plug body 8.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned problems and provide a jig for assembling parts built into a deep hole, which can guide the built-in parts to the correct assembly position inside the deep hole. .

Structure of the Invention [Means for Solving the Problems] In order to solve the above problems, the present invention has a structure including: a work surface on which a component body is placed, and a component body provided with a deep hole for assembling built-in components; a guide hole provided, and a tag disposed so as to be movable through the guide hole in the axial direction of the guide hole; the built-in component is placed at the end in the deep hole of the component body placed on the work surface; and a biasing means for biasing the guide pin so that the one end of the guide pin protrudes toward a side of the work surface on which the component body is placed. is a jig.

1 Effect] In the jig used for assembling the component with a built-in deep hole of the present invention described above, the guide pin is urged by the urging means, and one end of the yielding guide pin places the component body on the work surface. protrude to the side. Therefore, when the component body is placed on the work surface, one end of the guide pin is inserted into the deep hole of the component body. Therefore, the built-in component that is inserted or plugged into the deep hole of the component body placed on the work surface is supported at one end of the guide pin in the deep hole before correct assembly is brought into position.

The guide supports the built-in part at one end when force is applied to the built-in part from the direction opposite to the direction in which the guide pin is biased, such as during pressurization, caulking, or pressing of the final part. The pin moves in the axial direction of the guide hole through the guide hole provided in the work surface against the biasing force. Accordingly, while the built-in component is guided by one end of the guide pin, the built-in component reaches the correct position within the deep hole of the component body, and the assembly is completed.

[Example] An example according to the jig for assembling the deep-hole built-in component of the present invention described above will be described in detail below based on the drawings. However, the present invention is not limited to these embodiments, and includes various embodiments that can be considered based on technical matters obvious to those skilled in the art without departing from the gist of the present invention.

FIG. 1 shows an overall sectional view of a jig for assembling parts with built-in deep holes, which is a first embodiment of the present invention. As shown in FIG. 1, the jig main body 0 is provided integrally with a disc-shaped base part 12 and one side of the disc-shaped base part 2, and has a similar shape to the base part 12 and has a slightly diameter. It consists of a small mounting section 14. Top surface 1
Reference numeral 5 denotes an end surface of the mounting section 14, which is located on the opposite side to the side connected to the base section]2, and a positioning hole 16 is provided in the center thereof. This positioning hole 16 is used to insert the lower part of the holder of the component body during assembly and to position the holder, and is formed to have approximately the same shape as the lower part of the holder and to be slightly thicker. The bottom surface of the positioning hole] 6 is the work surface 2 on which the bottom surface of the lower part of the holder is placed, and a guide hole 18 is provided there. The guide hole 18 is provided at a position coaxial with a deep hole passing through the lower part of the holder when the holder is placed on the work surface 2, and has approximately the same diameter as the deep hole. Moreover, the guide hole 18 penetrates the mounting part 14 and reaches the base part 12, and there, the guide hole 18 is coaxial and has a larger diameter.
It is connected to a cylindrical base hole 20 that penetrates through the hole 2. This base hole 20 has an open opening portion 2 on the open side that has a larger diameter than other parts.
0a is provided, and a step is formed between the open mouth portion 20a and other portions. Also, on the inner peripheral surface of the step,
A female screw 2] is formed over a predetermined length.

The jig main body] 0 configured as described above is provided with a guide pin 22, a coil spring 24 as a biasing means, and a support member 26. The guide pin 22 is inserted into the guide hole]8 and is slidable in the axial direction along the guide hole 18, and is formed into an elongated rod shape. The coil spring 24 is disposed within the base hole 20, and the guide pin 22
is urged in the direction from the base section 12 to the mounting section]4.

Further, the support member 26 is screwed into the base hole 20 from the open mouth 20 a side of the base hole 20 to support the coil spring 24 .

The guide pin 22 is made of metal or a rigid non-metal, and one end 28 of the guide pin 22 is a part that guides a built-in component within a deep hole of a holder placed on the work surface 2. Further, the length of the guide pin 22 is twenty enough to guide the built-in parts to be assembled into the deep hole of the holder placed on the work surface 2 to a position for accurate assembly. The shape of the end portion 28 is
It has a hemispherical shape so that it can easily fit into the recess on the bottom of the built-in component.

The other end of the guide pin 22 is a cylindrical guide pin base 30 having a diameter slightly smaller than the diameter of the guide hole 8 and the diameter of the base hole 20. The guide pin base 30 is movable in the axial direction within the base hole 20 as the guide pin 22 moves. A stepped portion 30a is formed between the guide pin 22 main body portion that is slidable along the inner circumferential surface of the guide hole 18 and the guide pin base portion 30. Therefore, when the guide pin 22 protrudes up to two times from the work surface 2, its stepped portion 30a abuts the upper end surface 20b of the base hole 20, and the guide pin 22 is prevented from coming out from the work surface 2 to the outside. . Further, at the end of the guide pin base 30, a small diameter cylindrical part 3 with a smaller diameter is formed.
is designed to stay in place.

The support member 26 has a cylindrical shape and has a slightly larger diameter flange 2 at one end.
6a, and a male screw 26b is provided on the outer peripheral surface of a predetermined length 1 from the other end and is screwed into the female screw 21. When the flange 26a comes into contact with the step 8- in the base hole 20, the screwing of the support member 26 into the inside of the base hole 20 is stopped.

By changing the amount of screwing in, the biasing force of the spring 24 can be changed. Further, in the support member 26, an end surface 272 on the opposite side from the flange 26a is provided with a recess 27a, into which the other end of the spring 24 is inserted.

The coil spring 24 is located within the base hole 20 and is disposed in a compressed state between the guide pin base 30 and the support member 26 . is energized. In addition, spring 24
Various degrees of biasing force can be used depending on the length of the guide pin 22.

The first embodiment of the present invention configured as described above is used, for example, for assembling a constant residual pressure valve for a fuel injection pump. The assembly work will be explained below. As shown in FIG. 2, the holder 3 of the constant residual pressure valve 1 is inserted into the positioning hole 6 provided on the upper surface 15 of the mounting section 14,
A holder 3 is placed on the work surface 2. In this state, the guide hole] 8 is provided at a position where it communicates with the deep hole 4 of the holder 3 and is coaxial with it. Therefore, the guide pin 22, which is urged by the spring 24 and projects from the work surface 2, passes through the guide hole 18 and projects into the deep hole 4. At this time,
The length of the guide pin 22 is long enough to guide the built-in component at the end 28 in the deep hole 4, so that the end 28 is in a position that allows accurate assembly of the seat 6, which is the built-in component. It is in a state where it protrudes further in the biasing direction. Into the deep hole 4 in such a state, the built-in parts, the coil spring 5, the seat 6, and the ball 7 are inserted in this order from the open opening.Finally, the plug body 8 is press-fitted.

In that case, the seat 6 inserted next to the spring 5 is
Before coming into contact with the spring 5, the recess on the bottom surface of the seat 6 fits into the end 28 of the guide pin 22 protruding into the deep hole 4, so that the seat 6 can take an appropriate posture without tilting. and,
Furthermore, when the stopper 8 is press-fitted after the ball 7 is inserted, a force in the opposite direction to the urging direction of the spring 24 is applied to the seat 6 via the ball 7, and this force is applied to the guide pin 22.
It is transmitted to Since the guide pin 22 is biased by the spring 24, the biasing force and the force due to press-fitting oppose each other, and the bottom surface of the seat 6 and the end portion 28 of the guide pin 22 are reliably fitted. If the press-fitting force exceeds the biasing force of the spring 24 while in the fitted state, the guide pin 22
slides on the inner peripheral surface of the guide hole 18 in the direction from the mounting part 14 of the jig main body 10 to the base part 12 while resisting the urging force, and the end part 28 of the guide pin moves toward the work surface 2. It gradually sinks. At this time, the seat 6 also moves together with the guide pin 22 while being guided by the end portion 28 while maintaining an appropriate posture, and after contacting the spring 5, which is a built-in component, reaches the position for accurate assembly. Thereby, the press-fitting of the plug body 8 is completed, and the constant residual pressure valve 1 is completed. FIG. 3 shows an enlarged view of the state in which the assembly using the first embodiment of the present invention shown in FIG. 2 has almost been completed.

As described above, according to the first embodiment of the present invention, the sheet 6 is moved in the deep hole 4 of the holder 3 by the end 28 of the guide pin 22 which is biased by the spring 124 and protrudes from the work surface 2. While being guided, accurate assembly can reach the position while maintaining an appropriate posture. Conventional assembly is performed using a jig, as shown in Figure 7, where the seat 6 is tilted. A defective constant residual pressure valve that has been assembled will not occur.

Therefore, if the first embodiment of the present invention is used, the defect rate will be reduced, the quality of the constant residual pressure valve will be improved, the yield will be improved, and the productivity will be improved.

Furthermore, since the guide pin 22 is biased by a spring 24 so as to protrude from the work surface 2, the completed constant residual pressure valve is removed from the jig after one cycle of assembly is completed, and then the next When the assembling work starts, the protruding position of the guide pin 22 has already returned to the state before guiding the sheet 6, and accurate assembling can be performed easily and quickly.

The guide hole 18 provided in the working surface 22 forming the bottom surface of the positioning hole 16 has approximately the same diameter as the deep hole 4 passing through the lower part of the holder 3, and 3 is placed in a position that communicates with the deep hole 4 and becomes coaxial with it.

Therefore, when the holder 3 is inserted into the positioning hole 16 and placed on the work surface 2, the end portion 28 of the guide pin 22 protrudes into the deep hole 4 of the holder 3. In this way, the positioning of the holder 3 and the insertion of the guide pin 22 into the deep hole 4 can be performed simultaneously, thereby reducing the working time.

FIG. 4 and FIG. 5, which is a partially enlarged view of FIG. The second embodiment shows a jig for assembling parts with built-in deep holes.

The same parts as those in the first embodiment described above are designated by the same or corresponding symbols, and a description thereof will be omitted.

Built-in parts assembled into the damping valve 32 include the coil spring 5a, the seat 6a, and the stopper 8a, as well as a built-in frame part 34 inserted into the deep hole 4a of the holder 3a in front of and behind the spring 5a. The end portion 28a of the guide pin 22 of this second embodiment has a narrow diameter and a pointed shape so that it can easily fit into the inner hole of the bottom surface of the seat 6a.

The seat 6a is inserted into the deep hole 4a after the spring 5a and built-in frame component 34 are inserted.

Upon insertion, the seat 6a fits into the end 28a of the guide pin 22 that projects into the deep hole 4a before coming into contact with the spring 5a and the built-in frame component 34a.

Thereby, the seat 6a can take an appropriate posture in advance so that it can be accurately assembled into position. Then, the sheet 6a remains fitted with the end portion 28a and maintains its position, and as the plug body 8a is press-fitted, the sheet 6a is guided by the end portion 28a and reaches a position for accurate assembly.

Therefore, also in the case of the second embodiment, the built-in parts within the deep hole 4a of the damping valve 32 will not be assembled into a finished product while remaining out of the correct position, and the defect rate will be reduced. The quality, yield and productivity of damping valves can be improved. Further, as in the first embodiment, the damping valve assembly can be performed simply and quickly.

In each of the embodiments described in detail above, the positioning hole is not essential, and the guide pin should be in a protruding state so that it can guide the built-in component in the deep hole of the component body and guide it to the position for accurate assembly. Good.

Therefore, after placing the component body on a flat work surface and leaving the guide pin protruding into the deep hole, the operator must determine whether one end of the guide pin is in the appropriate position. Alternatively, the mounting position of the component body may be corrected.

The length of the guide pin is also related to the biasing force of the biasing means, etc., but when the component body is placed on the work surface, accurate assembly of built-in components is difficult due to the position of one end of the guide pin. Preferably, the length is sufficient for the part to protrude, and the length is such that one protruding end reaches slightly inside the open end of the deep hole of the component body placed on the work surface.

Furthermore, the shape of the end 5-section of the guide pin that guides the built-in component can be varied to suit the shape of the bottom surface of the built-in component to facilitate guiding. The shape itself may be a flat shape.

In each of the above-described embodiments, the spring 2 is used as a biasing means.
4 is provided between the support member 26 and the guide pin base 30, but the biasing means can also be provided at other locations.

For example, without providing the support member 26, one end of the coil spring is fixed to the upper end surface 20b of the base hole 20, and the other end is fixed to the stepped portion 30a of the guide pin base 30. As a result, even if the main body of the guide pin 22 is inserted through the inside of the coil spring, the guide pin 22 is suspended by the coil spring, and the end 28 of the guide pin 22 is made to protrude from the work surface 2. good. Further, it may be an embodiment that includes both such a coil spring for suspension and the spring 24 in each of the above-described embodiments.

Further, as the biasing means for biasing the guide pin, not only a spring but also various other elastic members such as a rubber material or a sponge may be used. Furthermore, electrical biasing means, for example, a coil around the guide hole,
A magnetic field may be generated in the guide hole, and the magnetic force may urge the guide pin to protrude from the work surface.

Note that when guiding with a guide pin, not only the end of the guide pin that protrudes from the work surface sinks toward the work surface, but also the work surface rises toward the end of the guide pin. It is also possible to consider a mode in which the In that case, when the component body is placed on the work surface, the work surface sinks against the biasing force of the biasing means, and the end of the guide pin protrudes into the deep hole of the component body. In other words, the relationship between the end of the guide pin and the work surface may be such that they are relatively biased.

In addition, a case may also be considered in which no biasing means is provided.

For example, instead of the biasing means, a holding means for maintaining the guide pin in a protruding state from the work surface is provided.

That is, due to the frictional force between the outer peripheral surface of the guide pin and the inner peripheral surface of the guide hole, the guide pin can be maintained in a stationary state protruding from the work surface against gravity without providing a biasing means. For example, the biasing means is not essential. In this case, the guide pin is held stationary by the static frictional force, and the built-in components are guided by the guide pin end portion against the dynamic frictional force. In the case where a biasing means is not provided in this manner, the return of the protruding state of the guide pin after one stroke of the assembly work must be done by some means, for example, by the worker. .

Furthermore, in each of the above embodiments, no biasing means is provided;
The guide pin base 3 is inserted into the fluid such as oil sealed in the base hole 20.
0 floats so that the end 28 of the guide pin 22 protrudes from the work surface 2, and when the final part is press-fitted, guidance is performed while resisting the buoyant force of the guide pin base 30. good. Alternatively, a gap may be provided between the outer circumferential surface of the guide pin base 30 and the inner circumferential surface of the base hole 20, and the gap may have the function of an onophis.

In addition, it is conceivable that not only the biasing means but also the guide holes are not provided. That is, if the guide pin protruding from the work surface expands and contracts itself, it is possible to guide the built-in parts within the deep hole. For example, the guide pin is made up of a plurality of cylindrical members with different diameters, and each member is fitted through a thin cylindrical bushing such that the outer diameter is large and the inner diameter is small, and the protruding parts are inserted. This is a case where the closer the tip of the guide pin is to the tip, the smaller the diameter of the cylindrical member, which allows it to expand and contract. In this case as well, the worker himself or herself returns the guide pin to the protruding state after completing one cycle of the assembly process.

Finally, in each of the above-mentioned embodiments, only the case where the built-in component is inserted into the deep hole of the component body after the component body is placed on the work surface has been described. It is also conceivable that the built-in components be fitted in advance and then inserted into deep holes in the component body to place the component body on a work surface.

As described in detail above, according to the jig used for assembling parts with built-in deep holes of the present invention, built-in parts to be assembled into a part body having a deep hole placed on a work surface can be assembled with guide pins. Since it is possible to accurately assemble the parts while being guided, the built-in parts will not be assembled into a finished product while being deviated from the correct position within the deep hole of the part body.

Therefore, the quality of the finished product in which the built-in component is assembled into the deep hole of the component body is improved, the yield is also improved, and the productivity is also improved.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the first embodiment of the present invention, and FIG.
A cross-sectional view showing how a constant residual pressure valve for a fuel injection pump is assembled using the embodiment shown in the figure, FIG. 3 is a partially enlarged view of FIG. 2 just before the assembly is completed, and FIG. A sectional view showing how a damping valve for a fuel injection pump is assembled using the second embodiment of the invention, FIG. 5 is a partially enlarged view of FIG. 4, and FIGS. 6 and 7 are a conventional example and its FIG. 4 is a cross-sectional view showing a problem when a constant residual pressure valve is assembled using the above-described method. 19- Constant residual pressure valve for fuel injection pump 2... Work surface of jig 3... Holder 4... Deep hole in holder 5... Coil spring 6, which is a built-in part... Sheet 7... Ball 8... Plug body
10...Jig body 12...Base part
14... Placement section 15... Top surface of placement section 16.
...Positioning hole 18...Guide hole 20...
・Base hole 22...Guide pin 24...Coil spring 26 as biasing means...
・Support member 28... Guide pin end 30... Guide pin base 32... Damping valve 34 for fuel injection pump.
・・Built-in frame parts for damping valve 2〇−

Claims (1)

[Scope of Claims] A work surface on which a component body is placed, which is provided with a deep hole for assembling built-in components, a guide hole provided in the work surface, and an axial direction of the guide hole that moves through the guide hole. a guide pin that guides the built-in component at one end in a deep hole of the component body placed on the work surface; A jig for assembling parts with a built-in deep hole, comprising a biasing means for biasing the guide pin so as to protrude toward a side on which a main body is placed.