JPH1068437A - Buffer material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the buffer capacity of a buffer body, and prevent cracks and breakage from being generated in the buffer body by providing a groove part which is provided with a joining surface to be abutted on an opposite surface of a counter member, and a projected part from the joining surface, and arranged along a root of the projected part. SOLUTION: A ring-shaped buffer which is used for a shock absorber, and in which an inner circumferential surface 6 is fitted to a rod 10 and an outer circumferential surface 7 is freely attached to an inner circumferential surface 21 of a cylinder body 20 has the rubber-like elasticity, and a buffer part 3 is formed on both sides 2, 2. In the buffer part 3, circular recessed parts are arranged with equal intervals in the circumferential direction, a projected part 4 from the side 2 is formed on a bottom surface of each recessed part, and the periphery of the projected part 4 is formed of an annular groove part 5. The volume of the groove part 5 is set to be larger than that of a projected part 4a. A buffer 1 demonstrates the buffer action between a stopper 11 fixed to the rod 10 and an end cover 2 provided on the cylinder body 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shock absorber used for, for example, a shock absorber.

[0002]

2. Description of the Related Art As a prior art relating to the present invention, there is a shock absorber shown in FIG.

FIG. 6 is a sectional view of the shock absorber 50. As shown in FIG.
In FIG. 6, the buffer 50 is disposed so as to be fitted to the rod 51 and to support the stopper 52. And it is arrange | positioned in the cylinder main body 53 in a loose state.

The rod 51 moves relative to the cylinder body 53 by the fluid pressure acting on a piston (not shown). When the rod 51 moves and reaches the final moving end, the stopper 52 fixed to the rod 51 is elastically supported by the buffer 50.

However, since the buffer 50 is formed in a ring shape and is compressed in the axial direction, the relationship between the amount of compression and the load shown in the graph A in FIG. 5 is obtained. For this reason, the compression amount increases with respect to the initial load, but the compression amount rapidly decreases from a certain point.

[0006] The graph of B shows the buffer 50 shown in FIG.
9 is a comparative example in which an experiment was conducted on a shock absorber provided with convex portions evenly distributed along the circumferential direction of the side surface of FIG. This process is also protrusion is compressed when the cushion would follow the process of change in the same amount of compression and the cushioning member 50 shown in FIG. 6, after the convex portion becomes as B ₁ is compressed .

[0007]

When any of the shock absorbers 50 is subjected to a high load, the amount of compression is reduced, so that the shock absorbing capacity is reduced and the shock absorber 50 is damaged. In particular, the buffer 5
At 0, cracks occur in the radial direction. In the case where the protrusion is provided on the side surface of the buffer 50, the protrusion is lost. In particular, the above-mentioned phenomenon occurs when a load is repeatedly applied.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a technical problem of the present invention is to improve the buffering capacity of a shock absorber and to prevent the shock absorber from cracking or breaking. Is to prevent it.

[0009]

The present invention is characterized in that it has a joint surface that abuts on the opposing surface of the mating member, has a protrusion protruding from the joint surface, and has a groove along the root of the protrusion. A cushioning product made of rubber-like elastic material.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a cushioning product according to an embodiment of the present invention.

FIG. 1 is a half sectional view of a cushioning product according to an embodiment of the present invention. 1 is a buffer product. Buffer 1
Is made of rubber or resin and has rubber-like elastic force. Rubber materials include nitrile rubber, acrylic rubber,
Urethane rubber, ethylene / propylene rubber or the like is used.

The shape of the cushioning article 1 is formed in a ring shape. A buffer 3 shown in FIG. 2 is formed on both sides 2 and 2 of the ring-shaped buffer 1. In this buffer portion 3, circular concave portions are formed on both side surfaces (joining surfaces) 2 and 2 at equal intervals in the circumferential direction. The recesses are formed evenly along the circumference of the side surfaces 2, 2. However, depending on the size of the buffer portion 3, the recesses are formed evenly along the circumferential direction of the circumference having different diameters. It is also good (the concave portions are arranged in series or in a zigzag shape in the radial direction).

[0013] In addition, a side surface 2 is formed from the bottom of the recess.
A protruding portion 4 that protrudes more is formed. An annular groove 5 is formed between the inner peripheral surface of the concave portion and the outer peripheral surface of the convex portion 4. That is, the groove 5 is formed at the base of the convex portion 4.

The volume V of the groove 5 is preferably formed to be larger than the volume V _{1 of the} projecting portion 4 a projecting from the side surface 2 of the projection 4. However, regarding the damage, the volume V of the groove 5
There even smaller than the volume V ₁ of the protruding portion 4a, the effect of the convex portion 4 is prevented from being damaged when compressed are obtained.

The inner peripheral surface 6 of the cushioning article 1 is fitted on a rod 10. The outer peripheral surface 7 is the inner peripheral surface 2 of the cylinder body 20.
Playing with one. And a rod 1 not shown
When the working fluid acts on the piston connected to
0 moves to reach the final moving end, and the stopper 11 fixed to the rod 10 is elastically supported by the cushioning article 1.

The cushioning product 1 comprises a stopper 11 fixed to a rod 10 and an end cover 2 provided on a cylinder.
It has a buffering action between the two. Then, the side surface 2 of the buffer article 1
And the protrusion 4a is compressed and deformed into the groove 5 to elastically support the stopper 11. Incidentally, the heights of the convex portions 4 may be alternately set in the circumferential direction. In addition, the arrangement of the convex portions 4 is as follows.
The protrusions 4 of the lower surface 2 may be shifted between the protrusions 4 of the upper surface 2.

FIG. 3 is a plan view of a buffer article 1 showing another embodiment of the present invention. The concave portion provided in the cushioning product 1 is formed in an annular groove that shares the center of the cushioning product 1. The beat-shaped convex portion 4 is formed to project from the bottom surface of the concave portion. That is, the annular groove 5,
5 are formed.

The total volume V of the space of the groove portions 5 is preferably larger than the volume V ₁ of the protrusion 4a that protrudes from the side 2,2 of the protrusion 4. However, if the grooves 5, 5 are formed on the inner and outer peripheral sides of the projection 4, the grooves 5, 5
Even the smaller than the volume V ₁ of the volume of the space protruding portion 4a, the effect to prevent damage when the convex portion 4 is compressed is observed.

The shape of the convex portion 4 is preferably formed such that the bottom surface of the concave portion is enlarged in a tapered shape in cross section, but in the present embodiment, the convex portion 4 is formed in a columnar shape.

FIG. 4 is a view showing a state in which the shock-absorbing article 1 of FIG. 3 is attached to a shock absorber and is being crimped.
In this crimped state, the lower convex part 4 in the figure is compressed, and then the upper convex part 4 is being compressed. Next, the grooves 5 are elastically deformed and the side surfaces 2, 2
Side is compressed. In other words, strictly speaking, when the buffer product 1 is completed after the lower convex portion 4 is compressed, the upper convex portion 4 is compressed. Further, the easily deformable portion of the groove portion 5 is compressed and deformed to have a buffering action. And finally, Side 2,
The two sides will be compressed to provide a cushioning effect.

FIG. 5 shows the relationship between the amount of compression of the buffer article 1 and the load. The A and B diagrams in FIG. 5 are as described in the section of the related art, and the C diagram is a relationship diagram between the compression amount and the load of the cushioning product 1 of the present invention. C of C diagram ₁ is a state where the convex portion 4 and the upper convex portion 4 of the lower side is a buffering action. Then, C ₂ is a state acting buffer deformed compressed around 5 groove, C ₃ are those sides 2,2 side is the buffering action deformed by compression.

As a result, it is recognized that the cushioning product 1 of the present invention has a better buffering capacity than the conventional product. Further, the formation of the groove 5 at the base of the projection 4 can prevent the damage of the projection 4. In addition, the groove 5 is shown in FIG.
In the cushioning product 1 shown in FIG. 1, it is recognized that providing only one side of the protrusion 4 is effective. Also, it is recognized that the shock-absorbing article 1 of the present invention is useful as a small-sized shock-absorbing article 1 (having an outer diameter of 10 to 30 mm), that is, it is useful for use in a small-sized apparatus. The equipment becomes large).

[0023]

【The invention's effect】

A) Since the cushioning product of the present invention has a convex portion and a groove at the base of the convex portion, the cushioning effect is provided by compressive deformation of the convex portion, and then the concave portion is also compressed and deformed to provide a buffering effect. Thus, the effect of improving the buffer capacity by several steps can be expected. In particular, although it was impossible to increase the buffer capacity in a small buffer product, the buffer capacity can be improved even in a small buffer product by configuring as in the present invention. As a result, it is possible to reduce the size of the device to which the buffer article is attached. B) In the cushioning article of the present invention, since the groove is provided at the base of the projection, even if a compression load is applied to the projection, the projection is not damaged, and the cushioning article itself has cracks, The occurrence of breakage can be effectively prevented.

[Brief description of the drawings]

FIG. 1 is a half sectional view showing a mounted state of a cushioning product according to an embodiment of the present invention.

FIG. 2 is a plan view of a protrusion of the cushioning product shown in FIG.

FIG. 3 is a plan view of a cushioning product according to another embodiment of the present invention.

FIG. 4 is a half sectional view showing a mounting state of the cushioning article of FIG. 3;

FIG. 5 is a comparative example showing the relationship between the amount of compression and the load between the shock-absorbing article of the present invention and a conventional shock-absorbing body.

FIG. 6 is a cross-sectional view showing a mounting state of a conventional shock absorber.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Buffer goods 2 ... Side surface (joining surface) 3 ... Buffer part 4 ... Convex part 4a ... Projection part 5 ... Groove part 6 ... Inner peripheral surface 7 ... Outer peripheral surface 10, 51 ... Rod 11 , 52 ...... stopper 20,53 ...... volume of the volume V ₁ ...... protruding portion of the cylinder body 21 ...... inner circumferential surface 22 ...... end cover 50 ...... cushion V ...... in the groove

Claims (1)

[Claims] An object has a joint surface (2) in contact with an opposing surface of a mating member (11, 22), a projection (4) protruding from said joint surface (2), and said projection (4). A cushioning article made of rubber-like elastic material, characterized in that the cushioning article has a groove (5) along the root of ()).