JP3443693B2 - Bound stopper - Google Patents

Description

Description: 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. 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 within a range not less than the rebound stroke of the suspension. This is a rubber elastic body exhibiting non-linear characteristics and sufficiently increasing the energy absorption of the spring system. That is, as shown in FIG. 4, for example, the above-mentioned bound stopper has a dish-shaped receiving seat 8 fixed to the upper part of the piston rod with the piston rod 6 of the shock absorber 2 inserted therein, and the above-mentioned shock absorber. It is interposed between the absorber 2 and the cylinder 9. On the other hand, as shown in FIG. 5, a plurality of projections 12 'made of an elastic material are provided on the surface 11' of the above-mentioned bound stopper which comes into contact with the cylinder so as to project at equal intervals on the circumference. I have. This projection is provided to soften the contact when the bound stopper hits the cylinder. [0005] However, in the above-described conventional bound stopper, although the contact of the projection is more flexible than that of the bound stopper main body,
If the contact with the cylinder is steep, the shock cannot be completely absorbed, and there is a problem that abnormal noise is generated at the time of the above hit. When a large load is applied to the cylinder when the cylinder comes into contact with the cylinder, the projection is compressed between the cylinder and the body of the bound stopper. You will be forced. SUMMARY OF THE INVENTION The present invention addresses the above-described situation and finds a novel structure around the above-mentioned projection to provide a sufficient shock absorbing power to eliminate the abnormal noise and to further reduce the compression applied to the projection. The purpose is to keep the deformation within a marginal range. [0008] That is, the feature of the bound stopper of the present invention that meets the above-mentioned object is that, as described above, the piston rod of the shock absorber is inserted and fixed to the upper part of the piston rod. Dish-shaped seat,
A substantially cylindrical elastic body bound stopper interposed between the cylinder of the shock absorber and a plurality of projections made of an elastic body on a contact surface of the bound stopper against the cylinder; Are formed, and the volume of the groove is substantially equal to or greater than the volume of the protrusion. In the above-mentioned bound stopper of the present invention, since the annular groove is formed around the projection, the height of the projection is substantially increased, and the flexibility of the projection is increased. It is possible to eliminate the abnormal noise by increasing the shock absorbing force at the time of contact. [0010] Further, 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,
Unnecessary compression deformation can be avoided by escaping into this groove. 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 against a cylinder according to an embodiment of the present invention, and FIG.
FIG. 3 is a cross-sectional view of a main part of the line A-B, FIG. 3 is a cross-sectional view of a main part of the same line BB, and FIG. 4 is a cross-sectional view showing a mounting state of the bound stopper according to the embodiment of the present invention. Shock absorbers 3, support 4 and coil springs 1a, boots for preventing rain and mud, respectively. 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. The bound stopper 1 is made of a cylindrical rubber elastic body having three concave grooves 10 provided on the outer peripheral portion thereof. When the piston rod 6 is inserted as shown in FIG. It is interposed between a dish-shaped receiving seat 8 fixed to the upper part of the rod 6 and a cylinder 9 of the shock absorber 2. In this embodiment, the bound stopper 1 and the seat 8 are integrated by vulcanization bonding. On the other hand, the lower surface of the bound stopper 1
When the shock absorber 2 is greatly shrunk, the shock absorber 2 has a contact surface 11 which comes into contact with the upper surface of the cylinder 9. As shown in FIGS. A plurality of protrusions 12 and an annular groove 13 which is recessed so as to surround each of the protrusions 12 as shown in the drawing are formed on the contact surface 11 at equal intervals on the circumference. The projection 12 and the groove 13 are
It is important that the volume of the projections 12 is approximately equal to or greater than the volume of the projections 12. The protrusion 12
It is appropriate that the diameter of the groove 13 is about 2 to 4 mm and the height (represented by a mesh line) is about 1 to 3 mm. A range of 8 mm and a depth of about 0.5 to 2 mm is suitable. The appropriate number of the projections 12 and the grooves 13 is about 4 to 8 pieces. Further, as shown in FIGS. 1 and 3, the contact surface 11 of the bound stopper 1 communicates the internal space 14 of the cylindrical bound stopper with the external space when the cylinder 9 contacts the cylinder. Three air vent grooves 15 are provided to allow the air in the internal space 14 that varies due to the expansion and contraction of the bound stopper 1 to flow. In the bound stopper according to the embodiment of the present invention, when a large load is applied to the shock absorber 2, the contact surface 11 of the bound stopper 1 comes in contact with the upper surface of the cylinder 9, and the U of the outer periphery of the bound stopper is reduced.
The U-shaped groove 10 mainly contracts and receives the load. At this time, even when the contact between the contact surface 11 and the cylinder 9 is performed steeply, in the bound stopper 1 according to the embodiment of the present invention, the annular member is formed around the protrusion 12. Since the groove 13 is formed, the height of the protrusion 12 is substantially increased and its flexibility is increased, the shock absorbing power at the time of contact with the cylinder is increased, and abnormal noise is generated at the time of contact. Can be eliminated. Further, since the protrusion 12 can sufficiently receive the volume of the compressed protrusion 12, the groove 13 escapes to the groove 13 when deformed even when a large load is applied to the cylinder. This makes it possible to avoid unnecessary compression deformation. While one embodiment of the present invention has been described above, the present invention can be appropriately changed in design without departing from the gist thereof. As described above, the bound stopper according to the present invention has a plurality of projections made of an elastic material on the contact surface of the bound stopper body with the cylinder, and surrounds each of these projections. The recessed annular groove is formed, and the volume of the groove is substantially equal to or greater than the volume of the projection. Since the annular groove is formed around the projection, the projection is formed. The height of the part is substantially increased, its flexibility is increased, the shock absorbing power at the time of cylinder contact is increased, and the generation of abnormal noise due to the conventional cylinder contact is eliminated. Since the groove can sufficiently receive the volume of the compressed protrusion, even when a large load is applied by the cylinder, unnecessary compression deformation is avoided by escaping into the groove at the time of deformation, This has a remarkable effect of improving the durability life.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing a contact surface of a bound stopper against a cylinder according to an embodiment of the present invention. FIG. 2 is a sectional view of a main part taken along line AA of FIG. 1; FIG. 3 is a sectional view of a main part of the BB line. FIG. 4 is a sectional view showing an attached 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. [Description of Signs] 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 seat 9 Cylinder 10 U-shaped groove 11 Contact surface 12 Projection 13 Groove 14 Bound Stopper internal space 15 Air release groove

────────────────────────────────────────────────── ─── Continuation of the front page (72) Michihiro Kawada Inventor: Michihiro Kawada, Nishikamo-gun, Aichi Prefecture, Uchigoe, Ichigoyama, 3rd, Toyo Tire & Rubber Co., Ltd. Automotive Parts Technology Center (56) Reference JP, A) Japanese Utility Model Showa 57-5546 (JP, U) Japanese Utility Model Showa 61-98605 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) F16F 9/00-9/58 B60G 1/00-25/00

Claims (1)

(57) [Claim 1] A piston rod of a shock absorber is inserted thereinto, and is interposed between a dish-shaped seat fixed on the upper part of the piston rod and a cylinder of the shock absorber. A plurality of projections made of an elastic body, and an annular groove recessed so as to surround each of the projections, on the surface of the bound stopper of the cylindrical elastic body. And a volume of the groove is substantially equal to or larger than a volume of the protrusion.