JP3153225U - Bump stopper - Google Patents

Abstract

There is provided a bump stopper capable of effectively preventing buckling deformation, eliminating abnormal noise, and obtaining a displacement curve of an increase in load with respect to an ideal compression amount of the bump stopper. A bump stopper made of an elastic material, comprising a thick base end portion and a thin tip end portion extending in the axial direction from the thick base end portion, and having an insertion hole through which a damper rod of a shock absorber is inserted. A configuration is provided in which a plurality of spherical protrusions with which the damper rod abuts are provided on the inner peripheral surface of the insertion hole. [Selection] Figure 1

Description

The present invention relates to a bump stopper.
The present invention also relates to a bump stopper suitable for use in an automobile hydraulic shock absorber or the like.

Conventionally, a bump stopper used in the shock absorber shown in FIG. 2 is known.
The hydraulic shock absorber in which the bump stopper shown in FIG. 2 is used includes a shock absorber 100, a damper rod (piston rod) 101, and a suspension spring 102. The suspension spring 102 absorbs an impact from the road surface, and the shock absorber. The vibration of the suspension spring is suppressed by operating a damping device built in the shock absorber 100 by expansion and contraction of the damper rod 101 with respect to 100.
In the hydraulic shock absorber, when the damper rod 101 is compressed with respect to the shock absorber 100, the bump stopper 103 attached to the outer end portion of the damper rod 101 is abutted against the outer end surface of the shock absorber 100 to compress the damper. The bottom end of the rod 101 is prevented.

Conventionally, an insertion hole for the damper rod 101 is formed in the bump stopper 103, and the bump stopper 103 is attached to the damper rod 101. An embodiment in which the inner periphery of the insertion hole of the stopper 103 is not brought into contact with the damper rod 101 has been proposed.
However, by bringing the entire inner circumference of the insertion hole of the bump stopper 103 into close contact with the damper rod 101, deformation of the bump stopper 103 during compression is guided by the damper rod 101, and buckling of the bump stopper 103 can be prevented.

However, in this case, it is difficult for dust, muddy water, etc. once entering the insertion hole of the bump stopper 103 to come off, and this rubs against the damper rod when the bump rubber is deformed, thereby deteriorating the durability of the bump stopper 103 and making it different. There is also a possibility that the sound may be generated and the damper rod 101 may be damaged to cause a malfunction of the hydraulic shock absorber.
Further, when the inner periphery of the insertion hole of the bump stopper 103 is not brought into contact with the damper rod 101, dust, muddy water or the like does not collect in the insertion hole. 101 cannot be guided by the bump stopper 103, the bump stopper 103 is likely to buckle, and the damper rod 101 hits the bump stopper 103 to cause abnormal noise.

Furthermore, as a proposal for eliminating these drawbacks, a mode has been proposed in which a plurality of protrusions extending in the axial direction are provided on the inner peripheral surface of the insertion hole of the bump stopper 103 (Patent Document 1).
However, in the embodiment in which a plurality of protrusions extending in the seed axis direction function to inhibit deformation of the bump stopper 103 during compression, the displacement of the increase in load with respect to the ideal compression amount of the bump stopper 103 is changed. It was difficult to obtain a curve, and the generation of abnormal noise was insufficient.

JP 2002-257181 A JP-A-60-139935

  Compared to the conventional bump stopper, the present invention effectively prevents buckling deformation and reduces the contact area with the damper rod as much as possible, thereby eliminating abnormal noise and making it ideal for the compression amount of the bump stopper. The purpose is to obtain a displacement curve of the load increase.

  The bump stopper according to the present invention includes a thick base end portion and a thin top end portion extending in the axial direction from the thick base end portion, and has an insertion hole through which a damper rod of a shock absorber is inserted. And a plurality of spherical protrusions with which the damper rod abuts are provided on the inner peripheral surface of the insertion hole.

The present invention has the following effects.
According to the bump stopper of the first aspect of the invention, it is possible to effectively prevent buckling deformation and to reduce the contact area with the damper rod as much as possible, thereby eliminating the generation of abnormal noise and compressing the ideal bump stopper. A displacement curve of the amount of increase in load with respect to the amount can be obtained.

Further, according to the bump stopper of the invention described in claim 2, since the bump stopper can be stably held on the outer peripheral surface of the damper rod, buckling deformation can be effectively prevented.
Further, according to the bump stopper of the invention described in claim 3, since the entire bump stopper can be stably held on the outer peripheral surface of the damper rod, it is possible to effectively prevent buckling deformation.

In addition, according to the bump stopper of the invention described in claim 4, since the bump stopper can be held uniformly in the circumferential direction, it is possible to effectively prevent the occurrence of uneven wear and abnormal noise.
Further, according to the bump stopper of the invention described in claim 5, since the bump stopper can be stably held in the axial direction, uneven wear and buckling deformation can be effectively prevented.

Further, according to the bump stopper of the invention of claim 6, even when the damper rod is inclined, it is possible to effectively avoid the damper rod from directly contacting the cylindrical inner peripheral surface. Uneven wear can be prevented.
Further, according to the bump stopper of the invention according to claim 7, since the entire bump stopper can be more stably held on the outer peripheral surface of the damper rod, it is possible to effectively prevent buckling deformation and It can avoid effectively contacting a cylindrical inner peripheral surface.

Further, according to the bump stopper of the invention described in claim 8, it is possible to obtain a displacement curve of the load increase amount with respect to the ideal bump stopper compression amount.
Furthermore, according to the bump stopper of the invention described in claim 9, it is possible to obtain a displacement curve of an increase amount of the load with respect to the compression amount of the ideal bump stopper more reliably.

Further, according to the bump stopper of the invention of claim 10, since the damper rod can be effectively avoided from directly contacting the cylindrical inner peripheral surface, the generation of abnormal noise and uneven wear can be prevented.
Furthermore, according to the bump stopper of the invention described in claim 11, since excessive contact with the damper rod can be avoided, generation of abnormal noise and uneven wear can be further reduced.

  In addition, according to the bump stopper of the invention described in claim 12, since the bump stopper can be reliably and accurately held on the shock absorber side, uneven wear of the bump stopper can be reduced.

It is sectional drawing of the bump stopper which concerns on this invention. It is principal part sectional drawing which shows a buffer.

Hereinafter, the best mode for carrying out the present invention will be described.
Based on FIG. 1, the form for implementing an invention is demonstrated.
This type of bump stopper includes a thick base end 2 and a thin top end 3 extending in the axial direction from the thick base end 2, and an insertion hole through which the damper rod 101 of the shock absorber 100 shown in FIG. 2 is inserted. 1 is provided.
A plurality of spherical protrusions 4 and 4 with which the damper rod 101 abuts are formed on the inner peripheral surface 11 of the insertion hole 1.

In addition, cylindrical inner peripheral surfaces 13 and 13 are formed adjacent to the annular groove portions 12 and 12 on the inner peripheral surface of the insertion hole 1 on the thin tip portion 3 side. A plurality of spherical protrusions 4 are provided.
Further, the spherical protrusion 4 is also provided on the cylindrical inner peripheral surface 13 of the thick base end 2.
The spherical protrusions 4 provided on the cylindrical inner peripheral surface 13 are annularly and uniformly arranged.
This effectively prevents the damper rod 101 from contacting the cylindrical inner peripheral surface 13.

Further, the spherical protrusions 4 are annularly disposed at both ends in the axial direction of the cylindrical inner peripheral surfaces 13, 13, 13.
By this, it can avoid more reliably that the damper rod 101 contacts the cylindrical inner peripheral surface 13. FIG.
Moreover, since the top part of the spherical protrusion 4 is arranged so as not to overlap the top part of the spherical protrusion 4 adjacent in the axial direction, the damper rod 101 and the inner peripheral surface 11 side of the bump stopper must always be in uniform contact. Therefore, the generation of abnormal noise and uneven wear can be prevented.

Furthermore, in the embodiment, the size of the spherical protrusion 4 is reduced from the thick base end 2 toward the thin tip 3, but various combinations of sizes may be used depending on the shape of the bump stopper. I can do it.
Further, in the embodiment, the size of the gap between the spherical protrusions 4 adjacent to each other in the circumferential direction of the spherical protrusion 4 is designed to increase from the thick base end 2 toward the thin distal end 3. It is good also as an aspect in which the adjacent spherical protrusion 4 mutually contacts.
In this case, when it is important to avoid the biting of earth and sand, it is only necessary to provide a gap between the spherical protrusions 4, and it is important to avoid that the damper rod 101 contacts the cylindrical inner peripheral surface 13. In this case, the spherical protrusions 4 adjacent in the circumferential direction may be in close contact with each other.

The spherical protrusion 4 is designed not to contact the outer peripheral surface of the damper rod 101 when the bump stopper is in an uncompressed state.
Further, an annular recess 21 is provided on the outer peripheral surface of the thick base end 2 to fix the bump stopper on the shock absorber side.
As the material for the bump stopper, various rubber-like elastic materials and foamed rubber-like elastic materials are used, and urethane foam is particularly preferable.

  The present invention is not limited to the best mode for carrying out the above-described invention, and various other configurations can be adopted without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Insertion hole 2 Thick base end part 3 Thin base end part 4 Spherical protrusion 11 Inner peripheral surface 12 Annular groove 13 Cylindrical inner peripheral surface 41 First spherical protrusion 42 Second spherical protrusion 43 Third spherical protrusion

Claims (12)

  An insertion hole having a thick base end portion (2) and a thin tip end portion (3) extending in the axial direction from the thick base end portion (2), through which the damper rod (101) of the shock absorber (100) is inserted. In the bump stopper made of an elastic material having (1), a plurality of spherical protrusions (4) with which the damper rod (101) abuts are provided on the inner peripheral surface (11) of the insertion hole (1). Bump stopper.   The inner peripheral surface of the thin-walled tip (3) of the insertion hole (1) is formed with cylindrical inner peripheral surfaces (13), (13) adjacent to the annular grooves (12), (12). The bump stopper according to claim 1, wherein the spherical protrusions (4) are provided on the inner peripheral surfaces (13), (13).   The bump stopper according to claim 1 or 2, wherein the spherical protrusion (4) is provided on a cylindrical inner peripheral surface (13) of the thick base end (2).   The bump stopper according to any one of claims 1 to 3, wherein the spherical protrusions (4) provided on the cylindrical inner peripheral surface (13) are annularly and evenly arranged. .   The bump stopper according to claim 4, wherein the spherical protrusions (4) are annularly arranged on each of the cylindrical inner peripheral surfaces (13) and (13).   The bump stopper according to claim 5, wherein the spherical protrusions (4) arranged in an annular shape are arranged at both axial ends of the cylindrical inner peripheral surfaces (13) and (13). .   The bump stopper according to any one of claims 1 to 6, wherein the spherical protrusions (4) are arranged so as not to overlap the top of the adjacent spherical protrusions (4) in the axial direction.   The size of the spherical protrusion (4) decreases from the thick base end (2) toward the thin tip (3). The bump stopper described in 1.   The size of the gap between the spherical protrusions (4) adjacent to each other in the circumferential direction of the spherical protrusion (4) increases from the thick base end (2) toward the thin tip (3). The bump stopper according to any one of claims 1 to 8, wherein:   The bump stopper according to any one of claims 1 to 8, wherein the spherical protrusions (4) adjacent to each other in the circumferential direction of the spherical protrusion (4) are in close contact with each other.   11. The spherical protrusion (4) is designed not to contact the outer peripheral surface of the damper rod (101) when the bump stopper is in an uncompressed state. Bump stopper.   The bump stopper according to any one of claims 1 to 11, wherein an annular recess (21) is provided on an outer peripheral surface of the thick base end (2).

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