JP3926487B2 - Bump stopper of hydraulic shock absorber - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
When the hydraulic shock absorber is compressed to the maximum, it collides with the bump cushion provided at the upper end portion of the piston rod, and receives the compression operation of the hydraulic shock absorber while pressing and shrinking the bump cushion. The present invention relates to a bump stopper of a hydraulic shock absorber for absorbing an impact generated during a compression operation.
[0002]
[Prior art]
Conventionally, as shown in FIG. 5, the shock absorber main body 4 side that absorbs the impact generated at the time of maximum compression while colliding with the bump cushion 3 provided on the piston rod 2 side of the hydraulic shock absorber 1 and compressing it. As the bump stopper 5, for example, one having the structure described below is widely used.
[0003]
That is, the bump stopper 5 is formed by forming a cap-shaped stopper body 6 by pressing means, and the upper surface of the stopper body 6 is also radially recessed by press working to form the depressions 7. A plurality of drooping projections 8 projecting toward the top are formed, and the lower end edges of the projections 8 are formed as locking step portions 9.
[0004]
In addition to the above, the drooping portion 10 of the stopper body 6 is provided with a discharge port 11 which is arranged in the circumferential direction with the drooping projection 8 and communicates with the inside and outside, and the central portion of the upper surface of the stopper body 6 has a hydraulic pressure. A bump stopper 5 is formed by providing an insertion hole 12 through which the piston rod 2 of the shock absorber 1 passes.
[0005]
Then, the insertion hole 12 is inserted into the piston rod 2 to cover the bump stopper 5 on the upper end portion of the shock absorber main body 4, and the locking step 9 which is the lower end edge of the drooping protrusion 8 is provided on the shock absorber main body 4. By pressing against the end face, the bump stopper 5 is left between the upper end face of the shock absorber body 4 while keeping the open state without blocking the discharge port 11 on the side face of the shock absorber body 4. It was designed to fit.
[0006]
[Problems to be solved by the invention]
With this configuration, when the hydraulic shock absorber 1 provided with the bump stopper 5 is used as a shock absorber for a traveling vehicle such as an automobile, muddy water, dust, or the like splashed during traveling is caused by the piston in the insertion hole 12. Even when the oil and dust seal 14 of the hydraulic shock absorber 1 enters the upper surface from the gap between the rod 2 and the bump stopper 5, these muddy water, dust, and the like are retained from the space 13 between the shock absorber body 4 and the bump stopper 5. It will be quickly removed to the outside through the discharge port 11.
[0007]
However, in the bump stopper 5 described above, the upper end surface of the bump stopper 5 is pressed by press working in order to secure a space portion 13 for removing muddy water, dust and the like that have entered. The drooping protrusions 8 are formed so as to protrude radially inwardly, and the lower end edges of the drooping protrusions 8 are pressed against the upper end surface of the shock absorber main body 4 as the locking step portions 9.
[0008]
For this reason, a relatively deep recess 7 is formed on the upper end surface which is the receiving surface of the bump stopper 5, and the bump cushion 3 provided on the piston rod 2 side is moved to the bump stopper 5 every time the hydraulic shock absorber 1 is compressed most. Since it is pressed and bites into these depressions 7, it has a drawback that the life of the bump cushion 3 is remarkably shortened.
[0009]
In addition, in order to sufficiently secure the passage area of the space 13 in order to quickly remove the invading muddy water and dust to the outside, the drooping projection 8 Since the height dimension of the bump stopper 5 is required to be large, the hanging protrusion 8 is easily cracked or broken during the pressing process of the bump stopper 5, and the yield of the product is deteriorated.
[0010]
Therefore, the object of the present invention is to eliminate the possibility of damaging the bump cushion and to quickly remove muddy water and dust that have entered the interior through a space having a sufficient passage area. It is an object of the present invention to provide a bump stopper for a hydraulic shock absorber having a novel configuration capable of being used.
[0011]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the means of the present invention comprises a cap-shaped stopper body composed of a plate-shaped receiving surface portion and a hanging portion formed by bending the periphery of the receiving surface portion downward. In the bump stopper of the hydraulic shock absorber that is attached to the upper end portion of the end caulking type hydraulic shock absorber by pressing the stopper step provided on the stopper body against the upper end of the hydraulic shock absorber, the inner periphery of the drooping portion A plurality of side projections projecting inwardly are provided in the circumferential direction, a locking step is formed at the lower edge of each side projection, and a drainage located between the side projections is formed on the hanging portion. bored outlet, and further characterized by being formed by providing a through hole through which the piston rod of the hydraulic shock absorber in the central portion of the receiving face.
In this case, ribs extending radially on the upper end surface of the receiving surface portion may be extruded and formed.
[0013]
That is, as described above, a side projection that protrudes inwardly is formed on the hanging portion that constitutes the stopper body, and a locking step portion that presses against the upper end surface of the hydraulic shock absorber is formed on the lower end edge of the side projection. By forming, the side protrusions do not have any influence on the shape of the upper end surface of the receiving surface portion, and the shape of the upper end surface can be kept flat.
[0014]
This eliminates the biting action of the bump cushion on the piston rod side against the bump stopper on the shock absorber body side when the hydraulic shock absorber is compressed to the maximum, thereby significantly extending the life of the bump cushion. It becomes.
[0015]
In addition to this, by selecting the position of the lower edge of the side projection as the bump stopper locking step, the passage area of the space for sufficiently removing the intruded muddy water and dust to the outside is sufficient. Since it becomes easy to ensure, these muddy water, dust, etc. can be quickly removed to the outside.
[0016]
In addition, the extrusion dimension of the side projection when the side projection is formed by extruding a part of the hanging portion inward is the passage area of the space for removing muddy water and dust. Since it only needs to have a strength that can withstand the impact during the most compression operation of the hydraulic shock absorber with little influence, it can be easily molded with good yield without causing cracking or tearing by pressing. .
[0017]
In addition to the above, by providing a rib-like radially extending protrusion on the upper surface of the bump stopper, the upper surface of the upper end surface is damaged without damaging the bump cushion on the piston rod side at the time of maximum compression of the hydraulic shock absorber. It becomes possible to discharge muddy water, dust, etc. more quickly while increasing the strength.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described based on examples shown in the accompanying drawings.
[0019]
As shown in FIGS. 1 and 2, the bump stopper of the present invention is the same as the conventional example shown in FIG. A plate-shaped receiving surface portion having a horizontal upper end surface 15 and a hanging portion 10 formed by bending the periphery of the receiving surface portion downward constitute a cap-shaped stopper body 6, and the stopper body 6 is caulked at the pipe end. A locking step portion provided on the stopper body 6 is pressed against the upper end of the hydraulic shock absorber 4 and attached to the upper end portion of the hydraulic shock absorber 4 of the mold.
In the present invention, a plurality of side projections 16 projecting inwardly on the inner periphery of the hanging portion 10 are provided along the circumferential direction, and the locking step 9 is provided at the lower edge of each side projection 16. The discharge port 11 located between the side projections 16 and 16 is formed in the hanging portion 10, and the insertion hole 12 through which the piston rod 2 of the hydraulic shock absorber is passed is provided in the central portion of the receiving surface portion. ing.
Further, as shown in the figure, a plurality of ribs 17 extending in a radial pattern on the upper end surface of the receiving surface are extruded.
This will be described in more detail below.
[0020]
The drooping portion 10 which is the side surface of the cap-shaped stopper body 6 is also provided with a plurality of side surfaces protruding inward at a desired interval (90 ° interval in the present embodiment) by the press working means. The protrusions 16 are formed, and the lower end edges of these side protrusions 16 form the locking step 9 when the stopper body 6 is mounted on the hydraulic shock absorber 1 (see the conventional case of FIG. 5).
[0021]
Further, a discharge port 11 that is arranged in the circumferential direction and communicates with the inside and outside of the hanging portion 10 is formed in a portion between each of the side projections 16, and a hydraulic buffer is provided in a central portion of the upper surface of the stopper body 6. Each of the insertion holes 12 through which the piston rod 2 of the vessel 1 passes is provided to constitute the pump stopper 5a.
[0022]
As in the case of FIG. 5, the above-described bump stopper 5 a is passed through the piston rod 2 to cover the upper end portion of the shock absorber body 4, and the side projection 16 provided on the hanging portion 10. By pressing the locking step portion 9 which is the lower end edge against the upper end surface of the shock absorber main body 4, the side surface of the shock absorber main body 4 is kept open without closing the discharge port 11, and the shock absorber main body The bump stopper 5a can be fitted with a space 13 having a predetermined dimension between the upper end surface 4 and the upper end surface 4.
[0023]
In this way, the side projection 16 projecting inward with respect to the hanging portion 10 of the bump stopper 5a is formed, and the engagement at the time of mounting the stopper body 6 to the hydraulic shock absorber 1 at the lower end edge of the side projection 16 is formed. By forming the stop portion 9, the side projections 16 do not have any influence on the shape of the upper end surface 15 that is the receiving surface of the bump stopper 5 a, and thus are the receiving surfaces of the bump stopper 5 a. It is possible to form the upper end surface 15 while keeping it flat.
[0024]
Therefore, during the maximum compression operation of the hydraulic shock absorber 1, the bump cushion 3 on the piston rod 2 side does not bite into the bump stopper 5 a on the shock absorber body 4 side, and the life of the bump cushion 3 can be significantly extended. It becomes.
[0025]
Moreover, in addition to the above, the passage area of the space portion 13 can be sufficiently secured by selecting the position of the lower end edge of the side projection 16 as the locking step portion 9 of the bump stopper 5a. It becomes possible to quickly remove muddy water, dust and the like that have entered the upper surface side to the outside.
[0026]
In addition, the push-out dimensions of these side projections 16 hardly affect the passage area of the space 13 for removing muddy water, dust, etc., and simply impact on the compression operation of the hydraulic shock absorber 1. Since it is sufficient if the strength can be withstood, it can be formed easily with good yield without forming cracks or tears by press working by forming it relatively shallowly.
[0027]
FIGS. 3 and 4 show another embodiment of the present invention. Compared with the embodiments of FIGS. 1 and 2 described so far, rib-like is formed on the upper end surface 15 of the bump stopper 5b. The protrusions 17 that extend radially are provided by being extruded.
[0028]
As a result, as in the case of the embodiment of FIGS. 1 and 2, the bump cushion 3 on the piston rod 2 side is not damaged by the protrusion 17 when the hydraulic shock absorber 1 is most compressed, and in addition thereto. It is possible to discharge muddy water, dust and the like more quickly while increasing the strength of the upper end surface 15.
[0029]
【The invention's effect】
According to the first aspect of the present invention, the side protrusion that protrudes inwardly is formed on the hanging part that constitutes the stopper body, and the locking step that presses the lower end edge of the side protrusion against the upper end surface of the hydraulic shock absorber. By forming the portion, these side projections do not have any influence on the shape of the upper end surface of the receiving surface portion, and the shape of the upper end surface can be kept flat.
[0030]
From this, at the time of the most compression operation of the hydraulic shock absorber, since the bump cushion on the piston rod side does not bite against the bump stopper on the shock absorber body side, the life of the bump cushion can be significantly extended. Become.
[0031]
In addition to this, by selecting the position of the lower edge of the side projection as the bump stopper's locking step, the passage area of the space part is sufficiently secured to exclude intruded muddy water and dust etc. Therefore, it becomes possible to quickly remove such muddy water and dust to the outside.
[0032]
In addition, the extrusion dimension of the side projection when the side projection is formed by extruding a part of the hanging portion inward is the passage area of the space for removing muddy water and dust. Since it only needs to have a strength that can withstand the impact during the most compression operation of the hydraulic shock absorber with little influence, it can be easily molded with good yield without causing cracking or tearing by pressing. .
[0033]
On the other hand, according to the invention of claim 2, in addition to the effect of the invention of claim 1 described above, by providing a rib-like radially extending protrusion on the upper end surface of the bump stopper, a hydraulic buffer is provided. While preventing the bump cushion from being damaged by these protrusions at the time of the most compression of the vessel, it is possible to discharge muddy water, dust and the like more quickly while increasing the strength of the upper end surface of the bump stopper.
[Brief description of the drawings]
FIG. 1 is a longitudinal front view showing an embodiment of a bump stopper according to the present invention.
FIG. 2 is a bottom view of the bump stopper in the above.
FIG. 3 is a longitudinal sectional front view showing another embodiment of the bump stopper according to the present invention.
FIG. 4 is a bottom view of the bump stopper in the same as above.
FIG. 5 is a partially longitudinal front view showing a hydraulic shock absorber provided with a bump stopper that has been widely used conventionally.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Hydraulic shock absorber 2 Piston rod 3 Bump cushion 4 Shock absorber main body 5, 5a, 5b Bump stopper 6 Stopper body 9 Locking step part 10 Hanging part 11 Outlet 12 Insertion hole 13 Space part 15 Upper end surface 16 Side protrusion 17 Projection

Claims (2)

A plate-shaped receiving surface portion and a hanging portion formed by bending the periphery of the receiving surface portion downward constitute a cap-shaped stopper body, and the stopper body is put on the upper end portion of the pipe end caulking type hydraulic shock absorber, In the bump stopper of the hydraulic shock absorber that is mounted by pressing the locking step portion provided on the stopper body against the upper end of the hydraulic shock absorber, the side protrusion protruding inwardly on the inner periphery of the drooping portion is provided in the circumferential direction. a plurality of spaced along, to form a locking stepped portion at the lower end edge of the respective side projections, also bored a discharge port located between said side projections on the hanging part, further hydraulic in the central portion of the receiving face A bump stopper for a hydraulic shock absorber, characterized in that it is provided with an insertion hole through which the piston rod of the shock absorber passes. 2. The bump stopper for a hydraulic shock absorber according to claim 1, wherein a rib-like radially extending protrusion is extruded on the upper end surface of the receiving surface portion .

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