JPH05346132A - Manufacture of buffer - Google Patents

Abstract

(57) [Summary] [Purpose] To facilitate the manufacture of shock absorbers. [Structure] A groove is formed on the outer circumference of a separator having an oil hole, and a bent portion is formed on the inner circumference of the bladder. The bent portion is fitted into the groove to integrate the separator and the bladder,
After that, the integrated separator and bladder are inserted from the open end of the cylinder with one end closed so that the bladder is on the cylinder closed end side to define a gas chamber between the bladder and the cylinder closed end side. Then, the separator is caulked from the outer circumference of the cylinder at a predetermined position.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method of manufacturing a shock absorber.

[0002]

2. Description of the Related Art Among hydraulic shock absorbers, there is one in which a liquid chamber and a gas chamber are separated by a separator, a piston rod is inserted into the liquid chamber from the outside, and a piston is fixed to the tip of the piston rod. In such a hydraulic shock absorber, the piston rod moves in and out of the cylinder due to the compression motion and the expansion motion, but a bladder is attached to the separator to cope with this volume change, and the bladder contracts to move the volume. Some are designed to absorb changes.

[0003]

By the way, when assembling such a hydraulic shock absorber, it is preferable that the separator and the bladder are integrated in advance and then inserted into the cylinder in this state. The bladder may come off the separator before insertion or may come off during insertion, which makes it difficult to manufacture the hydraulic shock absorber.

[0004]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention forms a groove on the outer periphery of a separator having an oil hole and forms a bent portion on the inner periphery of a bladder. By fitting the bent part to, the separator and the bladder are integrated,
From the opening end of the cylinder whose one end is closed, the integrated separator and bladder are inserted so that the bladder is on the cylinder closed end side to define a gas chamber between the bladder and the cylinder closed end side. The separator is caulked from the outer circumference of the cylinder at a predetermined position.

[0005]

The bladder is separated from the separator by forming a groove on the outer periphery of the separator and forming a bent portion on the inner periphery of the bladder, and fitting the bent portion into the groove to integrate the separator and the bladder. It will not come off easily, and the bladder will not come off from the separator when it is inserted into the cylinder.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a vertical cross-sectional view of a shock absorber according to the present invention, in which the upper and lower ends of a cylinder 1 of the shock absorber are caps 2,
3, the separator 4 is fixed in the cylinder 1 by caulking, and a concave groove 5 is formed in the outer peripheral portion of the separator 4, and the peripheral edge portion of the bladder 6 is formed in the concave groove 5 in the cylinder 1. The bladder 6 holds the oil chamber S1 in close contact with the peripheral surface and defines an oil chamber S1 and a gas chamber S2 pressurized and filled with an inert gas. Here, the bladder 6 is as shown in FIG.
The peripheral edge portion 6 and the central portion 62 are thick portions, and the thick peripheral edge portion 61 and the central portion 62 are continuous with the thin portion 63 to stabilize the deformed portion of the bladder 6 and improve the durability.
In addition, a bent portion 6 that engages with the groove 5 is provided on the inner periphery of the peripheral portion 61.
4, an annular protrusion 65 is formed on the outer periphery of the peripheral edge portion 61 in pressure contact with the inner peripheral surface of the cylinder 1. Further, an oil hole 7 that connects the upper oil chamber S3 and the lower oil chamber S4 is formed in the separator 4, and a piston rod 9 is inserted into the upper oil chamber S3 from above via a rod guide 8 and the piston rod 9 A piston 10 having a valve mechanism is attached to the lower end of 9.

In the above, when the shock absorber is in the extended state as shown in FIG. 1, the piston rod 9 is pulled out from the inside of the cylinder 1, so that the bladder 6 is lifted up by a volume corresponding to the pulled out amount. , The volume of the gas chamber S2 becomes large. On the other hand, when the shock absorber is in the compressed state, the piston rod 9 penetrates into the cylinder 1, so that the bladder 6 has a volume corresponding to this penetration volume as shown in FIG.
Expands downward.

In order to assemble the shock absorber having the above construction, the lower end of the cylinder 1 is supported on the jig 11 as shown in FIG. 4, and in this state, the upper end opening of the cylinder 1 is filled with gas. Apply the ingredient 12. The gas charging jig 1
A through hole 13 is formed at the center of the through hole 2, and the inner diameter of the through hole 13 is the same as the inner diameter of the cylinder 1. Next, the bladder 6 previously fitted in the groove 5 of the separator 4 is inserted into the through hole 13 of the gas filling jig 12 from above, the valve 14 of the gas filling jig 12 is opened, and the nitrogen gas is supplied to the cylinder 1. From the sealing hole 15 formed at the upper end to the cylinder 1
Enclose until it reaches a predetermined pressure. Then, the push rod 16 pushes the separator 4 together with the bladder 6 into the cylinder 1. At this time, the bladder 6 is brought into close contact with the lower surface of the separator 4 by the pressure of the enclosed gas in the cylinder 1. When the separator 4 and the bladder 6 are sealed to a predetermined position in the cylinder 1, the separator 4 is fixed to the cylinder 1 by caulking.

Next, after filling the cylinder 1 with hydraulic oil, an oil seal and a rod guide are attached to a piston rod 9 having a piston 10 fixed to one end, and the cylinder 1 is operated from a gas charging port 15 formed at the upper end of the cylinder 1. The piston 10 is inserted into the cylinder 1 while allowing the oil to overflow. When the O-ring 8a on the outer circumference of the rod guide 8 is press-fitted to the position where it closes the gas charging port 15 formed in the cylinder 1, the oil in the cylinder 1 has no escape and presses the gas chamber S2. That is, from the gas inlet 15 to the cylinder 1
The amount of oil corresponding to the stroke L to the O-ring 8a press-fitted therein causes the bladder 6 to expand toward the gas chamber S2. Then, the stopper ring 16 is fitted into the ring groove 17 on the inner circumference of the cylinder 1 to complete the gas charging work.

[0010]

As described above, according to the present invention, the groove is formed on the outer circumference of the separator, the bent portion is formed on the inner circumference of the bladder, and the bent portion is fitted into the groove. Since the separator and the bladder are integrated, the bladder does not easily come off from the separator, and the bladder does not come off from the separator even when it is inserted into the cylinder.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a shock absorber to which the present invention is applied.

FIG. 2 is a sectional view of an essential part for explaining the operation of the shock absorber according to the present invention.

FIG. 3 is a sectional view of the bladder.

FIG. 4 is a sectional view showing a bladder assembling process.

[Explanation of symbols]

1 ... Cylinder, 4 ... Separator, 5 ... Recessed groove, 6 ... Bladder, 64 ... Bent part, S1 ... Oil chamber, S2 ... Gas chamber.

Claims (1)

[Claims] 1. A separator having an oil hole is formed with a groove on the outer periphery thereof, a bent portion is formed on the inner periphery of the bladder, and the bent portion is fitted into the groove to integrate the separator and the bladder. After that, the integrated separator and bladder are inserted from the opening end of the cylinder whose one end is closed so that the bladder is on the cylinder closed end side, and a gas chamber is provided between the bladder and the cylinder closed end side. A method for manufacturing a shock absorber, characterized in that it is defined and the separator is caulked from a cylinder outer periphery at a predetermined position.