JPH05172176A - Assembling method for hydraulic shock absorber - Google Patents

Abstract

PURPOSE:To curtail the number of processes so as to shorten a working time without requiring equipments on a large scale. CONSTITUTION:A bound stopper 11 is-set on the upper end of an outer tube 6, after pre-caulking the upper end and the bound stopper 11 is pressed in this condition so as to execute caulking of the upper end 6a of the outer tube 6 and fitting of the bound stopper 11 in one process.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of assembling a hydraulic shock absorber used for a suspension of an automobile.

[0002]

2. Description of the Related Art A hydraulic shock absorber used for a vehicle suspension or the like generally has a structure as shown in FIG.

That is, the inside of the cylinder 1 is partitioned by a piston 2 into an upper chamber 3 and a lower chamber 4, and the lower chamber 4 and a reservoir chamber 5 are partitioned by a base valve 7 installed at the bottom of an outer tube 6. , Piston rod 8
The valve portion of the piston 2 generates a damping force with the flow of the hydraulic fluid from the upper chamber 3 to the lower chamber 4 during the expansion operation of the base, and the base fluid with the flow of the hydraulic fluid from the lower chamber 4 to the reservoir chamber 5 during the contracting operation. The valve portion of the valve 7 is adapted to generate a damping force. Then, a rod guide 9 for guiding the up and down movement of the piston rod 8 and a rod seal 10 for sealing the peripheral area of the piston rod 8 are attached to the upper portion of the cylinder 1 by caulking the upper end 6a of the outer tube 6. , And the upper end 6 of this outer tube 6
A bound stopper 11 for attaching a bound rubber is attached to the crimped portion of a. In the figure, 12 is
It is a bottom plate welded to the bottom of the outer tube 6.

Such a hydraulic shock absorber has been conventionally assembled by the following method.

First, the base valve 7, the cylinder 1, the rod guide 9, and the rod seal 10 are sequentially inserted and set in the outer tube 6 to which the bottom plate 12 is welded, and in this state, the upper end of the outer tube 6 is preliminarily prepared by a dedicated jig. Caulking (caulking at about 45 °). At this time, the piston 2 and the piston rod 8 are attached to the cylinder 1 in advance. Then, the upper end 6a of the outer swaged outer tube 6 which has been pre-crimped is completely removed by another jig (about 90 °
Then, the cylindrical portion of the bound stopper 11 is finally press-fitted into the outer circumference of the upper portion of the outer tube 6, so that the bound stopper 11 is attached to the crimped portion of the upper end 6a of the outer tube 6.

It should be noted that this similar technique is disclosed in Japanese Utility Model Laid-Open No. 3-68649.
It is disclosed in Japanese Patent Publication No.

[0007]

However, in the case of this conventional assembling method, after the base valve 7, the cylinder 1, the rod guide 9, the rod seal 10 and the like are set in the outer tube 6, the preliminary caulking step and the caulking step are performed. However, there is a problem that a lot of work time is required because the process of attaching the bound stopper and the three processes must be performed.

Therefore, the present invention is intended to provide a method of assembling a hydraulic shock absorber, which can reduce the number of steps without requiring large-scale equipment and shorten the working time.

[0009]

As a means for solving the above-mentioned problems, the present invention relates to a method for assembling a hydraulic shock absorber in which a bound stopper is attached to a caulked portion at the upper end of the outer tube, in the method of assembling the outer tube. After preliminarily caulking the upper end, a bound stopper was set there, and by pressing the bound stopper in this state, the upper end of the outer tube was caulked and the bound stopper was attached.

[0010]

When the upper end of the outer tube is crimped, the inner bottom surface of the bound stopper functions as a crimping blade.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, one embodiment of the present invention will be described with reference to FIGS. The same parts as those shown in FIG. 5 are designated by the same reference numerals.

This hydraulic shock absorber is assembled by sequentially inserting and setting the base valve 7, the cylinder 1, the rod guide 9 and the rod seal 10 into the outer tube 6, then caulking the upper end 6a of the outer tube 6, and bounding the stopper. 11 is applied in two steps, FIG. 1 (A) shows this first step, and FIG. 1 (B) shows this second step. As shown in FIG. 2, the bound stopper 11 includes a bottomed cylindrical cover 13 fitted to the outer periphery of the outer tube 6 and a support plate 14 that supports bound rubber (not shown). The support plate 14 has a corrugated air bleeding groove 15 formed by drawing or the like.

Further, in FIG. 1 (A), 16 is a caulking jig for pre-caulking, and the caulking jig 16 is approximately 4
The caulking claw 1 is provided with a 5 ° caulking blade 17 and a pressing claw 19 elastically supported by a spring 18.
When 7 is pressed against the upper end 6a of the outer tube 6,
The pressing claw 19 presses the inner diameter side of the rod seal 10 by the elastic force of the spring 18.
Furthermore, in FIG. 1 (B), reference numeral 20 is a presser for pressing the upper surface of the support plate 14 of the bound stopper 11, and this presser 20 is formed with an escape hole 20a for allowing the tip of the piston rod 8 to escape at the time of pressing. Has been done.

In the first step, as shown in the left half of FIG. 1 (A), the caulking jig 16 is set on the upper part of the outer tube 6, and a load is applied to the caulking jig 16 in this state. Then, as shown in the right half of FIG. 1 (A), the caulking blade 17 pushes and bends the end portion 6a of the outer tube 6 to about 45 °. After this, the caulking jig 16 is raised to complete the preliminary caulking on the end portion 6a.

In the second step, as shown in the left half of FIG. 1 (B), the cover 13 is slightly fitted to the outer tube 6 so that the bound stopper 11 is set on the upper part of the outer tube 6, and the bound is further bound. The pusher plate 20 is set on the upper surface of the support plate 14 of the stopper 11. When a load is applied to the pusher 20 from this state, the cover 13 of the bound stopper 11 is pressed into the outer tube 6, and at the same time, the inner bottom surface of the cover 13 presses the upper end 6a of the outer tube 6. When the cover 13 is completely press-fitted into the outer tube 6 in this way, the upper end 6a of the outer tube 6 is pressed by the inner bottom surface of the cover 13 and bent to about 90 °, and the bound stopper 11 is attached to the caulked portion. The Rukoto.

In the case of this assembling method, the step which has conventionally required two steps only by caulking the upper end 6a of the outer tube 6 can be performed in two steps including the attachment of the bound stopper 11 to the caulking portion. The number is definitely reduced,
The time required for work is shortened.

By the way, in this assembling method, the inner bottom surface of the cover 13 presses the upper end 6a of the outer tube 6 in the second step as described above, so that at this time, the edge of the upper end 6a galls the inner bottom surface of the cover 13. Although this may cause chips, if a curved surface portion 17a curved in the inner diameter direction is formed on the upper part of the caulking blade 17 of the caulking jig 16 as shown in FIG. 6a
No galling due to the edges of

Further, the cover 13 of the bound stopper 11
If the air bleed groove 15 provided in the air bleed groove 15 is formed in a corrugated shape as shown in FIG. 2, this portion may act as a cushion and a sufficient caulking force may not be obtained immediately below the air bleed groove 15. As shown in FIG. 4, if the air bleed groove 25 is formed in a concave shape on the lower surface side of the cover 13 and the number of the air bleed grooves 25 is increased to increase the passage area, the air bleed groove 25 is almost the same in the entire circumferential area. The crimping power can be obtained.

[0019]

As described above, according to the present invention, after the upper end of the outer tube is pre-crimped, the bound stopper is set there, and in this state, the bound stopper is pressed to crimp the upper end of the outer tube and the bound stopper. Since the deposition is performed in one step, the number of steps can be reduced as compared with the conventional one without requiring large-scale special equipment. Therefore, by using the present invention, the working time can be shortened.

[Brief description of drawings]

FIG. 1 is a sectional view showing an assembling process according to an embodiment of the present invention.

FIG. 2 is a side view showing the embodiment.

FIG. 3 is a cross-sectional view showing another embodiment.

FIG. 4 is a side view showing another embodiment.

FIG. 5 is a sectional view showing a general hydraulic shock absorber.

[Explanation of symbols]

6 ... Outer tube, 6a ... Upper end, 11 ... Bound stopper.

Claims (1)

[Claims] 1. A method of assembling a hydraulic shock absorber, wherein a bounce stopper is attached to a caulked portion of an upper end of an outer tube. In the method of assembling a hydraulic shock absorber, a bounce stopper is set there after pre-caulking the upper end of the outer tube and bound in this state. A method for assembling a hydraulic shock absorber, comprising: crimping an upper end of an outer tube and attaching a bound stopper by pressing a stopper.