JPH0874920A - Bound stopper - Google Patents

Abstract

PURPOSE: To dissolve any strange noise generated at the time of the contact, to a cylinder, of the surface to hit the cylinder and further restrict the compressed deformation of a buffer projection formed on the hit surface in a prescribed range in a vehicular bound stopper. CONSTITUTION: Plural projections 12 consisting of an elastic body and ring groove parts 13 recessed so that these respective projections 12 may be surrounded respectively are formed on the hit surface to the cylinder of a bound stopper 1 and also the volume of each groove part 13 is made almost equall to or more than the volume of each projection part 12.

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 bound stopper mounted on a shock absorber of a vehicle suspension system.

[0002]

2. Description of the Related Art Bound stoppers are interposed between, for example, a vehicle body and a strut suspension as auxiliary springs for coil springs, and have a non-linear characteristic in cooperation with the coil springs in a range not less than the rebound stroke of the suspensions. Is a rubber elastic body that is configured to sufficiently increase the energy absorption amount of the spring system.

That is, for example, as shown in FIG. 4, the bound stopper is a dish-shaped receiving seat 8 fixed to the upper portion of the piston rod 6 of the shock absorber 2 and the shock absorber 2 and the shock. It is provided between the absorber 2 and the cylinder 9.

On the other hand, as shown in FIG. 5, a plurality of protrusions 12 'made of an elastic body are provided on the contact surface 11' of the bound stopper against the cylinder so as to be circumferentially spaced at equal intervals. There is. This protrusion is provided to soften the contact when the bound stopper hits the cylinder.

[0005]

However, in the conventional bound stopper described above, although the contact of the protrusion is more flexible than that of the bound stopper main body,
If the abutment with the cylinder is steep, the shock cannot be absorbed completely, and there is a problem that abnormal noise is generated at the time of the hit.

Further, when a large load is applied to the above-mentioned protrusion when the cylinder comes into contact with the cylinder, the protrusion is in a state of being pinched between the cylinder and the bound stopper body, and the protrusion having no escape area is largely compressed and deformed by the pinching. You will be forced.

The present invention copes with the actual situation as described above, and by finding a new structure in the peripheral portion of the projection, a sufficient shock absorbing force is provided to eliminate the abnormal noise, and further the compression received by the projection portion. The purpose is to keep the deformation within a margin.

[0008]

That is, the feature of the bound stopper of the present invention which meets the above object is that, as described above, the piston rod of the shock absorber is inserted and fixed to the upper portion of the piston rod. Zodiac,
A bound stopper of a substantially cylindrical elastic body interposed between the shock absorber cylinder and a plurality of protrusions made of an elastic body on the contact surface of the bound stopper against the cylinder, and these protrusions. And an annular groove portion that is provided so as to surround each of them, and the volume of the groove portion is substantially equal to or larger than the volume of the protrusion portion.

[0009]

In the bouncing stopper of the present invention, since the annular groove is formed around the protrusion, the spine of the protrusion is substantially increased and its flexibility is increased, so that when the cylinder comes into contact with the stopper. It is possible to enhance the shock absorption power and eliminate the abnormal noise.

Furthermore, since the protrusion can sufficiently receive the volume of the protrusion in which the groove is compressed, even if a large load is applied to the cylinder,
By escaping into this groove, it is possible to avoid excessive compressive deformation.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a plan view showing a contact surface of a bound stopper according to an embodiment of the present invention to a cylinder, and FIG. 2 is a line A- in FIG.
FIG. 3 is a sectional view of an essential part of the line A, FIG. 3 is a sectional view of the essential part of the same line BB, and FIG. 4 is a sectional view showing an attached state of the bound stopper of the embodiment of the present invention. In FIG. Shock absorbers 3 are supports, 4 are coil springs, and 1a are rain boots.

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 this support 3 has an upper end of a coil spring 4 elastically supporting the vehicle body. Is bound to.

The bound stopper 1 is made of a cylindrical rubber elastic body around which three concave grooves 10 are provided, and the piston rod 6 is inserted in the piston as shown in the figure. It is interposed between a dish-shaped seat 8 fixed to the upper part of the rod 6 and a cylinder 9 of the shock absorber 2. The bound stopper 1 and the seat 8 are integrated by vulcanization adhesion in this embodiment.

On the other hand, the lower surface of the bound stopper 1 is
When the shock absorber 2 is greatly contracted, the contact surface 11 contacts the upper surface of the cylinder 9. As shown in FIGS. 1 and 2, in the embodiment of the present invention, the bound stopper 1 is made of the same rubber elastic body. The individual protruding portions 12 and the annular groove portions 13 that are recessed so as to surround each of the protruding portions 12 as shown in the drawing are formed on the contact surface 11 at equal intervals on the circumference.

The protrusion 12 and the groove 13 are formed by the groove 13
It is important that the volume of the above is substantially the same as or larger than the volume of the protrusion 12. The protrusion 12
The suitable size of the groove is about 2 to 4 mm, and the height (mesh line part) is about 1 to 3 mm. The groove 13 has an outer diameter of about 4 to 4. A range of 8 mm and a depth of about 0.5-2 mm is suitable. It is suitable that the number of the projections 12 and the grooves 13 is about 4 to 8.

Further, as shown in FIGS. 1 and 3, the contact surface 11 of the bound stopper 1 allows the internal space 14 of the cylindrical bound stopper and the external space to communicate with each other when abutting against the cylinder 9. Three air bleeding grooves 15 are provided so that the air in the internal space 14 that fluctuates due to the expansion and contraction of the bound stopper 1 is circulated.

In the bound stopper of the embodiment of the present invention, however, when a large load is applied to the shock absorber 2, the contact surface 11 of the bound stopper 1 abuts on the upper surface of the cylinder 9, and the U of the outer periphery of the bound stopper is contacted.
The V-shaped groove 10 mainly contracts to receive the load.

At the time of contact between the contact surface 11 and the cylinder 9 at this time, even if the contact surface 11 and the cylinder 9 are steeply contacted, in the bound stopper 1 of the embodiment of the present invention, the annular shape is provided around the protrusion 12. Since the groove portion 13 is formed, the spine of the protrusion 12 is substantially heightened to increase its flexibility, the shock absorbing force at the time of contact with the cylinder is increased, and abnormal noise is generated at the time of contact. Can be eliminated.

Furthermore, since the protrusion 12 can sufficiently receive the volume of the protrusion 12 compressed by the groove 13, even if a large load is applied to the cylinder, the protrusion 12 escapes to the groove 13 when deformed. By doing so, it is possible to avoid excessive compression deformation.

Although one embodiment of the present invention has been described above, the present invention can be appropriately modified in design without departing from the scope of the invention.

[0022]

As described above, the bound stopper according to the present invention is provided with a plurality of protrusions made of an elastic body and a recessed portion surrounding each of these protrusions on the contact surface of the bound stopper body against the cylinder. And the annular groove is formed, and the volume of the groove is substantially equal to or larger than the volume of the protrusion, and since the annular groove is formed around the protrusion, the spine of the protrusion is Is substantially higher and its flexibility is increased, the shock absorption force at the time of cylinder contact is increased, and the generation of abnormal noise due to conventional cylinder contact is eliminated. Since the volume of the compressed protrusion can be sufficiently received, even if a large load is applied by the cylinder, it will escape to this groove when deformed, avoiding unnecessary compressive deformation and its durable life. In which a marked effect of improving.

[Brief description of drawings]

FIG. 1 is a plan view showing a contact surface of a bound stopper according to an embodiment of the present invention with respect to a cylinder.

FIG. 2 is a cross-sectional view of a main part taken along the line AA of FIG.

FIG. 3 is a cross-sectional view of the main part of the same line BB.

FIG. 4 is a cross-sectional view showing a mounted state of the bound stopper according to the embodiment of the present invention.

FIG. 5 is a plan view showing a contact surface of a conventional bound stopper against a cylinder.

[Explanation of symbols]

 1 Bound Stopper 1a Boot 2 Shock Absorber 3 Support 4 Coil Spring 5 Absorber Rod 6 Piston Rod 7 Spring Seat 8 Dish-shaped Receiving 9 Cylinder 10 U-shaped Groove 11 Contact Surface 12 Projection 13 Groove 14 Bound Stopper Internal Space 15 Air Ditch

Front Page Continuation (72) Inventor Michihiro Kawada, Miyoshi-cho, Nishikamo-gun, Aichi, Uchikoshi, No. 3, Ikuyama, Toyo Tire & Rubber Co., Ltd. Automotive Parts Technology Center

Claims (1)

[Claims] 1. A bound stopper of a substantially cylindrical elastic body which is interposed between a dish-shaped seat fixed to the upper part of a piston rod of a shock absorber and fixed to the upper portion of the piston rod, and a cylinder of the shock absorber. In the contact surface of the bound stopper against the cylinder, a plurality of protrusions made of an elastic body and an annular groove recessed so as to surround each of these protrusions are formed, and the volume of the groove is set to the above. Bound stopper characterized in that the volume is approximately the same as or larger than the volume of the protrusion.