JPS6237655Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to the configuration of an assembly jig used when assembling a base valve provided at the bottom of a shock absorber.

[Technical background of the invention]

For example, as shown in FIG. 1, a shock absorber 1 is used as a device for absorbing vibrations in an automobile.
The piston is usually constructed as follows. That is, it is composed of a cylinder part 2 formed in a double cylindrical shape and a piston part 3 housed inside the cylinder part 2, and the cylinder part 2 is filled with oil. The piston part 3 is connected, for example, to the body side of the automobile, and the cylinder part 2 is connected, for example, to the wheel side of the automobile. When the piston part 3 is pushed into the cylinder part 2 by the shaking of the automobile, it is pushed in with a relatively small force, and conversely, when the piston part 3 tries to return to its original position, the valve works to restrict the flow of air inside, so that the piston returns slowly. This absorbs the reaction of the shock, and acts as a shock absorber. The valve device is usually provided at the bottom of the piston part 3 and the cylinder part 2. The configuration of the base valve 4 provided at the bottom of the cylinder part 2 is as shown in Figure 2. First, the valves are composed of a central valve 5, which allows a certain amount of oil to pass when the piston 3 is pushed into the cylinder 2 and closes when the piston 3 returns, and a non-return valve (made of a spacer part 6) that opens while providing a certain resistance when the piston 3 returns. The entire base valve 4 is roughly divided into a stopper 7 that stops the piston 3 when it is pushed to the maximum, a case 8 that supports the stopper 7, and a seat 9 at the bottom. The case 8 and the seat 9 form a certain space. The stopper 7 has a through hole 10 in the center, and a valve guide 11 provided in the center of the seat 9 is inserted into the through hole 10. There is a certain gap between the valve guide 11 and the through hole 10. A small annular central valve 5 is fitted around the valve guide 11, and the central valve 5 is pressed toward the through hole 10 of the stopper 7 by a spring 12 provided around the lower part of the valve guide 11. The stopper 7 has a flange 13 on its peripheral edge, and a non-return valve consisting of a large annular spacer part 6 is provided between the flange 13 and the case 8 .
This non-return valve is pressed against the case 8 by a trapezoidal spring 14 that exists between the case 8 and a flange 13. A small through hole 16 is present in the case 8 and is usually covered by the spacer part 6 that is the non-return valve.

Conventionally, in assembling a base valve, the upper stopper part 7 and the case part 8 are assembled as a preparatory step, then the lower seat part 9 and the valve guide part 11 are assembled, and then, Both were finally assembled to complete the entire assembly. Conventionally, the upper stopper part 7 and the case part 8 are assembled in the preparatory stage as shown in FIG. That is, the pedestal 21
The stopper part 7 is placed on top of the stopper part 7 in the opposite direction, and the trapezoidal spring 14, spacer part 6, and case part 8 are stacked on top of each other in this order, and the operator presses the trapezoidal spring 14 manually. In addition, it was necessary to hold each component in a state in which it was centered, and temporarily set it by placing a cap-shaped anti-float jig 22 with an open center over the components. After this temporary setting is completed, the stopper part 7 protruding from the case part 8 is fixed by the upper caulking head 23.
The caulking work was performed by caulking the caulking points 15.

[Problems with conventional technology]

However, according to this conventional assembly technique, the work efficiency is low because the workers manually align each part, and furthermore, the spacer part 6 is temporarily set without being properly aligned, and then the crimping work is performed. In such cases, as shown in FIG. 5, the non-return valve made of the spacer part 6 did not function as a normal valve and was a defective product.
In addition, the normal position of the spacer component 6 is shown in FIG.

[Purpose of invention]

The present invention was developed in view of the above problems, and it improves the workability of assembly work, enables automatic assembly, and also allows spacer parts to be assembled without being aligned in the correct position. It is an object of the present invention to provide an assembly jig for a shock absorber base valve subassembly that can prevent the occurrence of defective products.

[Summary of the idea]

The present invention consists of a setting side that allows parts to be set simply by feeding them in order, and a pressing side that presses and caulks the set parts. On the setting side where parts are set, a short tubular guide jig is provided around a short cylindrical bottom receiving jig so as to be movable up and down, and this guide jig is biased upward by a spring. Ru. When each part is set on this set side, the coil spring of the parts is not yet pressed, so the caulking part of the stopper part is not yet exposed.

The pressing side that presses and caulks the caulking portion of the set component is constituted by a caulking head and a component holding jig that is biased downward by a spring around the caulking head.

Each part supplied to the setting side and set is automatically aligned. When the pressing side descends, the component holding jig first presses each of the set components, and as it further descends, the guide jig on the setting side begins to retreat downward. When the guide jig is sufficiently retreated, the caulked portion of the stopper component is exposed on the upper surface of the case component. When the pressing side further descends, the crimping head crimps the exposed crimping location, completing the crimping work.

This eliminates the need for workers to manually align each part, and allows them to be aligned by simply feeding each part to the set side one after another. The parts to be caulked are exposed on the upper surface of the case part, and there is no need for an operator to manually press the trapezoidal spring and temporarily set it. Therefore, work efficiency is improved and automatic assembly becomes possible, and at the same time, alignment of non-return valves and the like, which are spacer parts, is automatically performed, thereby preventing the occurrence of defective products.

[Example of idea]

Referring to FIG. 6, an embodiment of the present invention will be described. The set side of this embodiment is composed of a short cylindrical bottom receiving jig 31 and a short tubular guide jig 32 provided around the receiving jig 31 so as to be movable up and down. The guide jig 32 is urged upward by a spring 33. A pin 34 is provided through the bottom receiving jig 31 in the left-right direction. This pin 34 functions as a stopper when the guide jig 32 is lowered and functions to prevent the guide jig 32 from rotating. The stopper part 7, the trapezoidal spring 14, the spacer part 6, and the case part 8 are supplied and set in the order of the container formed by the bottom receiving jig 31 and the short tubular guide jig 32. At the same time as this setting, alignment of each part is automatically performed. Since the coil spring 14 is not yet pressed, the caulking portion 15 of the stopper component 7 is not exposed above the case component 8. Further, the case component 8 and the trapezoidal spring 14 are placed on a stepped portion 35 provided inside the guide jig 32 so as to maintain a horizontal state.

Next, on the pressing side, there is a central caulking head 36 and a spring 37 around this caulking head 36.
and a component holding jig 38 that is urged downward by a component holding jig 38. The upper end of the component holding jig 38 is engaged with the pressing side to prevent it from falling off downward.

In this embodiment, the assembly work is performed as follows. When the pressing side begins to descend, the tip of the component holding jig 38 on the pressing side presses the upper surface of the case component 8, and each component begins to descend downward along with the guide jig 32. This lowering is done against the force of the spring 33. Further, since the component holding jig 38 is also urged downward by the spring 37, the contact between the component holding jig 38 and the case component 8 is made soft. When the pressing side further descends, the case part 8 and the spacer part 6 are moved to the trapezoidal spring 1.
4 is pressed against the stopper part 7. The caulking portion 15 of the stopper component 7 is exposed at the upper end of the case component 8. In this exposed state, the caulking head 36 is lowered and the caulking portion is caulked to complete the caulking work.

According to this embodiment, the case part 8, the spacer part 6, the trapezoidal spring 14, and the stopper part 7
is set in the space formed by the guide jig 32 and the bottom receiving jig 31, so that centering is automatically performed. By the action of the component holding jig 38 and the guide jig 32, the caulking portion 15 of the stopper component 7 is automatically exposed on the upper surface of the case component 8. This improves the workability of the assembly work and enables automatic assembly. Furthermore, the alignment of each component is automatically performed, and the occurrence of defective products as shown in FIG. 5 due to poor alignment of the spacer component 6 is also prevented.

[Effect of idea]

According to the assembly jig for the shock absorber bail valve sub-assembly of the present invention, the workability of assembly work is improved and automatic assembly is possible.
Since each component is automatically aligned, it is possible to prevent the spacer components from being stuck together due to poor alignment, thereby preventing the production of defective products.

[Brief explanation of the drawing]

Fig. 1 is a front view showing a shock absorber used in an automobile, Fig. 2 is a vertical sectional view showing the bottom of the shock absorber shown in Fig. 1, and Fig. 3 is a conventional base valve of the shock absorber shown in Fig. 2. FIG. 4 is an enlarged view showing the bottom part in a normal state in FIG. 3, FIG. 5 is a diagram showing a defective state in FIG. 4, and FIG. FIG. 2 is a longitudinal cross-sectional view of an assembly jig according to an example. 1...Shock absorber, 2...Cylinder part, 3...Piston part, 4...Base valve, 5
... Central valve, 6 ... Spacer parts, 7 ... Stopper parts, 8 ... Case parts, 9 ... Seat parts,
10... Through hole, 11... Valve guide part, 12...
... Spring, 13 ... Flange, 14 ... Trapezoidal spring, 15 ... Caulking point, 21 ... cradle, 22 ... Levitation prevention jig, 23 ... Caulking head, 31 ... Receiving jig, 32 ... Guide jig, 3
3... Spring, 34... Pin, 35... Stepped part, 36... Caulking head, 37... Spring, 38... Parts holding jig.

Claims (1)

[Scope of Claim for Utility Model Registration] In the preparation stage for assembling the base valve of the shock absorber, stopper parts, coil springs, etc. that form part of this base valve,
This is an assembly jig for assembling spacer parts and case parts, and the setting side for setting the parts includes a short tubular guide jig provided around a short cylindrical bottom receiving jig so as to be movable up and down. This guide jig is configured to be biased upward by a spring, and the pressing side for pressing and caulking the caulking part of the set part is pushed downward by the spring around the caulking head and the caulking head. 1. An assembly jig for a shock absorber base valve sub-assembly, characterized in that the jig is constituted by a component holding jig that is biased by.