JPS5811956Y2 - Stopper mounting device for hydraulic shock absorbers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stopper mounting device for a hydraulic shock absorber that allows accurate positioning and easy assembly when disposing an intermediate stopper or the like in a cylinder.

Generally, in a hydraulic shock absorber such as a stay damper, a piston rod is slidably inserted into a cylinder via a piston, a rod guide is rolled and caulked on the head side of the cylinder, and a seal is fixed to the lower end of this rod guide. ,
Below this seal, an intermediate stopper is roll caulked with an arbitrary gap so as not to interfere with the seal, and in some cases, a rubber stopper is fixed to the lower end of this intermediate stopper, so that when the piston and piston rod are fully extended, these It abuts against the intermediate stopper and the rubber stopper.

In this case, the roll caulking of the intermediate stopper is performed simultaneously with the roll caulking of the rod guide.

That is, an intermediate stopper, a seal, and a rod guide are inserted into the cylinder in advance, and the rod guide is positioned while looking from the outside from the end face of the cylinder head and roll caulking is performed. The roll tightens depending on the feeling when held in place.

For this reason, the exact position of the intermediate stopper cannot be confirmed from the outside, making positioning extremely troublesome and difficult to assemble, as well as increasing costs.

Therefore, the purpose of the present invention is to form a roll grooved part on the cylinder while accurately detecting the position from the outside, and to allow a stopper to be hooked to this roll grooved part when the piston is extended, thereby simplifying assembly and reducing costs. It is an object of the present invention to provide a stopper mounting device for a hydraulic shock absorber that can be distantly related to the above.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a cylinder 1 according to a preferred embodiment of the present invention.
A piston rod 3 is slidably inserted therein via a piston 2, and the piston rod 3 extends to the outside through a seal 4 and a rod guide 5 on the head side.

The rod guide 5 is roll caulked by the roll groove 6 while its position is viewed from the outside.

A roll grooved part 7 is formed above the cylinder 1, and the position of this roll grooved part 7 is lower than this so as not to interfere with the seal 4, and the position is also that of the cylinder head outside the cylinder. It is set accurately by measuring from the end face.

On the other hand, at the upper end of the piston 2, a hard rubber stopper 10 serving as an intermediate stopper is fixed to the piston rod 3 while being held between a washer 8 and an elastic holding plate 9.

The hard rubber stopper 10 has a curved and notched R-processed part 12 formed on the outer periphery of the shoulder part of the main body 11, and also has one or a plurality of through holes in the longitudinal direction with an arbitrary gap on the outer periphery of the main body 11. A notched groove 13 is bored, the R-processed portion 12 faces the roll grooved portion 7, and the notched groove 13 operates as a hydraulic oil passage.

Although the cutout groove 13 is formed to have a semicircular cross section as shown in FIG. 2, it is not limited to this shape.

The piston 2 is provided with a passage 14 and a leaf valve 15 that opens and closes through the passage 14 to generate damping force.

In the above-described hydraulic shock absorber, when the piston rod is fully extended, the rounded portion 12 of the hard rubber stopper 10 engages with the inner periphery of the roll portion 7 to stop the movement of the piston rod 3.

Therefore, the presser plate 9 and the hard rubber stopper 10 can be prevented from hitting the seal 4 and interfering with it.

Further, during the extension operation, the oil in the upper oil chamber 16 flows out into the lower oil chamber 17 via the notched groove 13.

On the other hand, during compression operation, the oil in the oil chamber 15 flows out into the upper oil chamber 16.

Next, FIG. 3 shows another embodiment, which is a modification of the hard rubber stopper 10 of FIG. 1.

That is, an annular projection 19 is formed on the shoulder of the hard rubber stopper 18, and an annular groove 20 having a semicircular cross section or similar to this is formed between this projection 19 and the outer periphery of the rubber stopper 18. A vertical cutout groove 21, 22 is formed on the outer periphery.

In this case, when the piston rod is fully extended, the annular groove 20 fits into the inner periphery of the roll grooved portion 7 to provide a slight locking function, and the strength of this locking is determined by the number of notched grooves 21. is possible.

FIG. 4 shows another embodiment of the present invention, in which an intermediate stopper 23 and a rubber stopper 24 are slidably loosely fitted into the cylinder 1, and an oil chamber 15 is provided on the inner periphery of these stoppers 23 and 24. , 16 are formed to allow the hydraulic oil to flow therethrough.

An annular rounded portion 27 is cut out in the shoulder portion of the intermediate stopper 23, and this is arranged to face the roll grooved portion 7.

Therefore, when the piston rod is fully extended, the upper end of the piston pushes up the rubber stopper 24 and the intermediate stopper 23, and when the rounded part 27 engages with the roll grooved part 7, the piston stops, and the seal 4 is designed not to interfere.

FIG. 5 also relates to another embodiment, which is substantially the same as the embodiment of FIG.

That is, the valve stopper or holding plate 28 at the upper end of the piston.
An intermediate stopper 29 made of hard rubber or the like is fixed to the piston rod 3 at the top, and an annular rounded part 30 is formed on the shoulder of the intermediate stopper 29 so that it can be locked to the roll grooved part 7. Further, one or more longitudinal grooves 31 are formed on the outer periphery of the intermediate stopper 29, so that the rounded part 30 is hooked on the roll grooved part 7 when the piston rod is fully extended.

Similarly, FIG. 6 shows a further modification of the embodiment of FIG.
An intermediate stopper 34 made of hard rubber or the like is held between the holding piece 33 having a curved cross section and held on the piston rod side. A number of vertical notch grooves 36 are formed so that the rounded part 35 is locked to the roll grooved part 7 when the piston is fully extended.

As described above, the stopper mounting device according to each embodiment of the present invention does not require positioning of an intermediate stopper because the roll grooved portion 7 can be set at an accurate position easily and quickly while looking from the outside.

Therefore, the hydraulic shock absorber is easy to assemble and costs can be reduced.

The position of the roll groove machining section 7 may be measured from the end face of the cylinder head or from the cylinder bottom side, but in either case, the machining position can be set while looking from the outside, so no skill is required. It can be assembled.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a partially cutaway vertical side view of a hydraulic shock absorber according to an embodiment of the present invention, FIG. 2 is a plan view of the intermediate stopper of FIG. 1, FIG. 4, 5, and 6 are partially cutaway vertical side views of hydraulic shock absorbers according to other embodiments. 1...Cylinder, 4...Seal, 7.
...Roll groove processing section, 10.18.23, 29.
34...Intermediate stopper, 12,20°27.3
0.35...R processing part, 13, 31.36...
...Notch groove, 25...Gap.

Claims (6)

[Scope of utility model registration request] (1) A roll groove is formed above the cylinder slightly below the sealing position, and the outer periphery of the intermediate stopper, which is slidably inserted into the cylinder, is rounded to correspond to the roll groove. A stopper mounting device for a hydraulic shock absorber in which the intermediate stopper has a notch and a vertical through hole is formed in the intermediate stopper. (2) A mounting device for a stopper in a hydraulic shock absorber according to claim 1, wherein the rounded part is cut out around the shoulder of the intermediate stopper. (3) A mounting device for a stopper in a hydraulic shock absorber according to claim 1, wherein a cutout groove is formed on the outer periphery of the intermediate stopper as a through hole. (4) A stopper mounting device for a hydraulic shock absorber according to claim 1, wherein a gap is formed on the inner periphery of the intermediate stopper as a through hole. (5) A stopper mounting device for a hydraulic shock absorber according to claim 1, which is a utility model registration claim, in which a hard rubber stopper is fixed to a piston rod as an intermediate stopper. (6) A stopper mounting device for a hydraulic shock absorber according to claim 1, wherein the intermediate stopper is loosely fitted into the cylinder.