JPS6126654Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cylindrical elastic cushion, which is suitable for use, for example, in a body-side attachment part of an automobile shock absorber.

A shock absorber that is built into an automobile suspension system and consists of a piston and a cylinder has the piston connected to the body and the cylinder connected to the axle, so this shock absorber can serve as a vibration transmission path from the axle to the body. A cylindrical elastic cushion is interposed at the connection between the shock absorber and the body in order to prevent vibrations from being transmitted to the body via this vibration transmission path. The present invention relates to an elastic cushion suitable for such use.

By the way, the above-mentioned elastic cushion for the shock absorber is generally cylindrical, and both end faces located in the axial direction are flat. When a gap is created between the cushion and the body when installed, or when the piston of the shock absorber moves in the direction of extension or contraction, a gap is created between the elastic cushion and the body. or water may enter the vehicle.

Possible countermeasures include increasing the tightening margin of the elastic cushion to make it tighter, or adding a lip to the elastic cushion, but the former causes worsening of vibration and noise and worsens steering stability, while the latter causes This results in deterioration of the sealing properties and durability of the lip.Although it sufficiently prevents mud and water from entering the interior of the vehicle, an elastic cushion that solves the above-mentioned problems has not yet been developed.

Therefore, the purpose of the present invention is to prevent deterioration of vibration and noise and deterioration of steering stability by not changing the static spring characteristics and dynamic spring characteristics of the elastic cushion.
Moreover, it is an object of the present invention to provide a cylindrical elastic cushion that can improve sealing performance and durability.

The present invention has been developed for this purpose, in which at least one sealing protrusion is formed on at least one end surface of a cylindrical elastic cushion and continuously surrounds the shaft hole, and the elastic cushion is attached to an object to be attached. The present invention is characterized in that recesses are formed continuously in the circumferential direction on both side hem portions of the protrusion for receiving the deformed surplus portions of the protrusion caused by compression when the protrusion is compressed.

This will be explained below based on a specific example.

The elastic cushion 1 of the present invention has a cylindrical shape with a shaft hole 2 in the center, and is made of rubber. Instead of rubber, it is also possible to use an elastic material such as synthetic resin. As shown in FIGS. 1 and 2, sealing protrusions 4, 4 that continuously surround the shaft hole 2 are formed on the end surfaces 3, 3 in the axial direction of the elastic cushion 1. . Since this protrusion 4 is ring-shaped and has an extremely small radial width compared to the radial length of the end face 3, as will be described later, when the elastic cushion 1 is attached to an object, the elastic cushion The static spring characteristics and dynamic spring characteristics of No. 1 are almost the same as those of an elastic cushion without protrusions. In other words, the static spring characteristics and dynamic spring characteristics of the elastic cushion are not significantly different from those of an elastic cushion without protrusions.
The radial width and protrusion length of the protrusion 4 are determined.

Recesses 5, 5 extending in the same direction as the protrusions 4, 4, that is, in the circumferential direction, are provided at both side skirts of the protrusions 4, 4. As shown in FIG. 3, when the elastic cushion 1 is attached to an object to be attached, for example, the body 11 of an automobile, the recess 5 is formed in the body 11.
As a result of compressing the protrusion 4, the protrusion 4 is deformed, and deformed surplus parts 4a, 4a are formed on both sides of the protrusion 4.
form to the extent that it can be accepted.

In the above example, the protrusion 4 is provided on both end surfaces 3, 3 of the elastic cushion 1, but it may be provided on only one of the ends depending on the location of use.
Furthermore, the number of protrusions 4 may be one or more than two, instead of two. In this case, the protrusion 4 is the shaft hole 2
It is not necessary to be concentric with respect to the other, but it may be located eccentrically. The single protrusion can also be formed in a spiral shape. Regardless of the form of the protrusion 4, the recesses 5 provided on both side skirts of the protrusion 4 extend in substantially the same direction as the protrusion 4.

As shown in FIG. 4, the elastic cushion of the present invention constructed as described above can be used, for example, when connecting the shock absorber 10 of an automobile to the body 11, as shown in the figure, between the shock absorber 10 and the body 11. It is installed and ready for use. That is, a retainer 13 is placed on the rod 12 connected to the piston of the shock absorber 10, and the elastic cushion 1 is interposed between the retainer 13 and the body 11. Further, a retainer 13 is placed above the body 11, and an elastic cushion 1 is placed thereon.The retainer 13 is brought into contact with the upper side of the elastic cushion 1, and a nut 14 is screwed into the screw provided at the end of the rod 12. At the same time, tighten the elastic cushion 1 between the
is pressed against the body 11. When the elastic cushion 1 is tightened in this manner, the protrusion 4 of the elastic cushion 1 is deformed in the radial direction of the elastic cushion 1, as shown in FIG. It is received in recesses 5, 5 provided on both sides.
This deformation increases the width of the protrusion 4 in contact with the body 11, that is, the contact surface, and improves the sealing performance. Now, when the car is running, mud and water are scattered from the tires 15 in the direction of the arrow 16, and some of it is
As shown by the arrow 17, it reaches between the body 11 and the elastic cushion 1. However, since the protrusion 4 of the elastic cushion 1 is in contact with the body 11 with sufficient contact surface and contact pressure, the sealing performance is good and mud and water do not enter the vehicle interior as shown by the arrow 18. There isn't. Furthermore, even if the rod 12 of the shock absorber 10 moves in the contraction direction and acts to widen the gap between the elastic cushion 1 and the body 11, the protrusion 4 will return to its pre-deformation state due to its elasticity. Since it extends in the axial direction as
Sealing performance is not impaired.

According to the elastic cushion of the present invention, on its end surface,
A sealing protrusion that continuously surrounds the shaft hole is provided, and recesses are provided on both sides of the protrusion to receive the deformed excess flesh of this protrusion, so the amount of deformation can be increased. Moreover, cracks do not occur at the base of the protrusion. However, as shown in FIG. 5, although the protrusion 21 is provided on the end surface of the elastic cushion 20, in a form in which no recess is provided,
Since the base of the protrusion 21 is constricted, if the elastic cushion 20 is twisted, a crack 22 will occur from the base as shown in FIG. 6, and the protrusion 21 will be severed, making it unusable. I become confused. Furthermore, according to the elastic cushion of the present invention, even if there are protrusions, the static spring characteristics and dynamic spring dynamics are almost the same as those of an elastic cushion without protrusions, so vibrations and noise may worsen, and handling stability may be affected. No deterioration occurs.

In addition to the above-mentioned application examples, the present invention can be applied to places where vibration is absorbed and fluid leakage in the radial direction is prevented.

[Brief description of the drawings]

Figure 1 is a plan view of the cylindrical elastic cushion of the present invention;
Figure 2 is a longitudinal sectional view of the same, Figure 3 is an explanatory diagram of the tightened state, and Figure 4 is an explanatory diagram of an example of using the cylindrical elastic cushion of the present invention, which is installed between the shock absorber and the body of an automobile. FIG. 5 is a sectional view of the elastic cushion without a recess around the protrusion, and FIG. 6 is an explanatory diagram of the same tightened state. 1: Elastic cushion, 2: Shaft hole, 4: Projection,
5: Concave.

Claims (1)

[Scope of utility model registration request] A cylindrical elastic cushion that is attached to an object in an axially compressed state, at least one sealing protrusion continuously surrounding the shaft hole is formed on at least one end surface, and the elastic A cylindrical elastic member characterized in that recesses are formed continuously in the circumferential direction on both side hem portions of the protrusion to receive the deformed surplus portion of the protrusion caused by compression when the cushion is attached to an object to be attached. Cushion.