JP2606273Y2 - Bound stopper - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a bouncing stopper mounted on a shock absorber of a vehicle suspension, and more particularly to a bouncing stopper which exhibits a stable damping effect against load fluctuation.

[0002]

2. Description of the Related Art A bound stopper is interposed, for example, between a vehicle body and a strut suspension as an auxiliary spring for a coil spring, and cooperates with the coil spring in a range not less than a required rebound stroke of the suspension. It is a rubber elastic body exhibiting non-linear characteristics and having a sufficiently large energy absorption amount of the spring system.

That is, as shown in FIG. 5, for example, the above-mentioned bound stopper 13 has a dish-shaped receiving seat 8 'fixed to the upper part of the piston rod 6 with the piston rod 6 of the shock absorber 2 inserted therein. The shock absorber 2 is interposed between the shock absorber 2 and the cylinder 9. As shown in the figure, the conventional bound stopper is designed so that a substantially cylindrical main body is formed in a bellows shape to obtain a non-linear characteristic at the time of compression.

[0004]

However, in the above-mentioned conventional bound stopper, there is a problem that it is difficult to obtain a sufficient nonlinear characteristic because the aspect ratio, that is, the height / outer diameter is relatively small. ing.

Although a bound stopper having an increased aspect ratio has been proposed to cope with this problem, even though a good nonlinear characteristic can be obtained with this stopper having an increased ratio, When a load is applied, another problem such as buckling easily occurs as shown in FIG.

Further, in these conventional bound stoppers, the former has a limit of durability of 50%, and the latter has a limit of durability due to the problem of the aspect ratio, and the latter has a limit of durability due to the problem of buckling. Attempts to improve durability have been studied.

The present invention addresses the above situation and finds a new configuration for the bound stopper, thereby enabling smooth compression without buckling even when a load is applied,
Moreover, with sufficient nonlinear characteristics and compression ratio,
It is an object of the present invention to improve the buffer function and durability of the stopper.

[0008]

That is, the feature of the bound stopper according to the present invention that meets the above-mentioned object is that, as described above, the piston rod of the shock absorber is inserted thereinto and the dish-shaped is fixed to the upper part of the piston rod. Seat and
In substantially tubular bound stopper is interposed between the cylinder of the shock absorber, the peripheral surface of the bound stopper, a U-shaped section groove plurality, thereby forming a circumferential direction, of the groove At the bottom, a small groove in the form of a slit with a bottom is continuously formed.

In the above-mentioned bound stopper, by forming the end portion of the bound stopper to be tapered, the inflection point of the non-linear characteristic can be made smooth, the contact area with the seat or the like can be reduced, and the load stopper under heavy load can be obtained. It is possible to prevent the contact surface from wrapping around the counterpart member.

[0010]

In the bound stopper according to the present invention, a U-shaped groove mainly contracts when a load is applied, but a slit-shaped small groove provided around the bottom of the groove is provided prior to this. It is compressed and creates a trigger for shrinkage over the entire circumference of the groove. As a result, the entire circumference of the concave groove shrinks at the same time. As a result, the bound stopper of the present invention can eliminate the problem of buckling and can set the aspect ratio as large as possible. It is possible to obtain a non-linear characteristic and a compression ratio.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a sectional view showing an attached state of a bound stopper according to an embodiment of the present invention. In the figure, 1 is a bound stopper, 2 is a shock absorber, 3 is a support, 4 is a coil spring, and 1a is a rain mudguard boot. Each is shown.

The support 3 is bolted to a piston rod 6 of the shock absorber 2 via an absorber rod 5, and a spring seat 7 embedded in the support 3 serves as an upper end of a coil spring 4 for supporting the vehicle body. Is joined to.

On the other hand, the above-mentioned bound stopper 1 is formed of a cylindrical rubber elastic body, and as shown in FIG.
Is interposed between a dish-shaped receiving seat 8 fixed to the upper portion of the piston rod 6 and the cylinder 9 of the shock absorber 2. In this embodiment, the bound stopper 1 and the seat 8 are integrated by vulcanization bonding.

[0014] In the present invention, the outer peripheral surface of the tubular bound stopper 1, a U-shaped groove 10 four, evenly formed over each entire circumference, furthermore, the the three bottom of the grooves 10, that are brought evenly formed over a bottom slit-like small groove 11 all around. The size of the upper Symbol small groove 11 has a width in the embodiment is about 2mm in both depth, if may remain in dug leaving unit thickness ranging from about 2~5mm of t of the grooves 11, is preferably implemented It is possible.

Further, in the bound stopper of this embodiment, as shown in the drawing, the lower end portion 12 is tapered so as to smooth the inflection point of the non-linear characteristic described later, The contact area of the shock absorber 2 with respect to the upper surface of the cylinder 9 is reduced so as to prevent the contact surface of the stopper 1 from sneaking into the peripheral surface of the cylinder 9 under heavy load.

In the bound stopper 1 according to the embodiment of the present invention, when the load is applied, the portion of the U-shaped groove 10 mainly contracts. Prior to this, the groove 11 is compressed, creating a trigger for shrinkage evenly over the entire circumference of the groove.

Thus, the above-mentioned bound stopper 1
By solving the conventional buckling problem, the aspect ratio (height / outer diameter) can be set to be as large as about 2.0 as compared with the conventional example shown in FIG. 5, and as a result, as shown in FIG. Compared to the small nonlinear characteristic of the conventional example, a sufficient nonlinear characteristic as shown in FIG. 2 is obtained, and a high compression ratio of about 70% is realized.
The durability of the bound stopper can be greatly improved.

As described above, the bound stopper according to the embodiment of the present invention has been described. By adjusting the width and the number of the U-shaped concave grooves 10, it is possible to freely adjust the deflection at the time of low-frequency load.

[0019]

As described above, the bound stopper according to the present invention has a plurality of U-shaped concave grooves formed on the peripheral surface of the cylindrical rubber elastic body, and has a bottom at the bottom of these concave grooves. A small groove having a bottom slit shape is further formed, and when the concave groove is contracted, the small groove gives a trigger uniformly over the entire circumference of the concave groove, so that the conventional buckling problem can be solved. As a result, it is possible to set the aspect ratio of the bound stopper to a required large value, thereby providing a sufficient non-linear characteristic to the stopper, realizing a high compression ratio, and greatly improving the durability. It has a great effect.

Further, by forming the end of the above-mentioned bound stopper in a tapered shape, the inflection point of the non-linear characteristic is smoothed, the contact area with the seat or the like is reduced, and the contact surface under high load is reduced. It is also possible to prevent sneaking around the counterpart member and biting.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a mounting state of a bound stopper according to an embodiment of the present invention.

FIG. 2 is a graph showing load-deflection characteristics of the example.

FIG. 3 is a graph showing a load-deflection characteristic of a conventional bound stopper.

FIG. 4 is a graph showing load-deflection characteristics of a conventional bound stopper in which the aspect ratio is simply increased.

FIG. 5 is a sectional view showing a conventional bound stopper.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bound stopper 2 Shock absorber 3 Support 4 Coil spring 5 Absorber rod 6 Piston rod 7 Spring seat 8 Dish-shaped seat 9 Cylinder 10 U-shaped concave groove 11 Slit small groove with bottom 12 Lower end 1a Boots

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tetsuya Watanabe 3rd Ikuyama, Utsugoe, Miyoshi-cho, Nishikamo-gun, Aichi Prefecture Inside the Automotive Parts Technology Center of Toyo Tire & Rubber Co., Ltd. (72) Inventor Makoto Niki Miyoshi, Nishikamo-gun, Aichi Prefecture No. 3, Ichigoyama, Ichigo-cho, Toyo Tire & Rubber Co., Ltd. Automotive Components Technology Center (72) Inventor Yuki Kawaguchi No. 3, Ikayama, Ichigo-shi, Miyoshi-cho, Nishikamo-gun, Aichi Prefecture No. 3 Toyo Tire & Rubber Co., Ltd. (72) Inventor Ichiro Nakai 3rd Ikuyama, Utsugoe, Miyoshi-cho, Nishikamo-gun, Aichi Pref. Toyo Tire & Rubber Co., Ltd. Automotive Parts Technology Center (56) References JP-A-3-66940 (JP, A) Akira Mikai 62-60402 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) B60G 7/04 B60G 11/52-11 / 54 B60G 15/06 F16F 9/32

Claims (2)

(57) [Scope of request for utility model registration] 1. A substantially cylindrical bound stopper interposed between a dish-shaped seat fixed to an upper part of the piston rod and a cylinder of the shock absorber, wherein a piston rod of the shock absorber is inserted. the peripheral surface of the bound stopper, a plurality of U-shaped cross section of the groove, and forming in the circumferential direction, the bottom of the groove, successively
The bound stopper further comprises a slit-shaped small groove with a bottom. 2. The bound stopper according to claim 2, wherein the end of the bound stopper is formed to be tapered.