JPH08338466A - Vibration damper - Google Patents

Abstract

PURPOSE: To promote the cost down of production to dispense with the installation of another member as well as to enable it to regulate the displacement of an elastic body. CONSTITUTION: In this vibration damper, installing an elastic body 3 in space between an inner cylinder 1 and an outer cylinder 2, and formed with a sliding part 4 consisting of a through hole pierced through along the inner cylinder 1 between both these cylinders 1 and 2, a spot adjoing to this sliding part 4 of the outer cylinder 2 is dented and a projection 6 projecting to the side of the inner cyclinder 1 is formed therein.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration device having an elastic body such as rubber provided between inner and outer cylinders such as an engine mount and a bush.

[0002]

2. Description of the Related Art Conventionally, an anti-vibration device is known in which an elastic body is provided between metal inner and outer cylinders, and a curled portion formed of a through hole extending along the inner cylinder is formed between the inner cylinder and the outer cylinder. ing. In such a vibration isolator, when an input is made in the direction perpendicular to the axis, the elastic body facing the sill portion collides with the inner surface of the outer cylinder, and the elastic body is displaced until the elastic body is further compressed. In order to regulate the displacement of the elastic body, as shown in FIG. 5, the elastic body 3 is provided between the inner cylinder 1 and the outer cylinder 2, and the cursed portions 4 are formed above and below the elastic body 3 so that the outer cylinder 2 It is known that a stopper 5 is attached to a portion facing the cutout portion 4. Alternatively, a structure in which a stopper (metal fitting) is embedded in the elastic body 3 is also known. The stopper 5 is formed of a hard member such as metal or synthetic resin.

[0003]

In order to regulate the displacement of the elastic body 3, a separate member such as the stopper 5 has conventionally been fixed or embedded, so that the cost of the separate member itself and the labor and cost for mounting the separate member are reduced. Was needed.

Therefore, the present invention provides a vibration damping device capable of restricting the displacement of the elastic body by reducing the cost by eliminating the need to mount a separate member in addition to the inner cylinder, the outer cylinder and the elastic body. With the goal.

[0005]

In order to achieve the above object, the present invention provides an elastic body between an inner cylinder and an outer cylinder so that the elastic body is provided between the inner cylinder and the outer cylinder and along the inner cylinder. In a vibration isolator having a curled portion formed of a penetrating through hole, a protruding portion protruding toward the inner cylinder side is formed by denting a portion facing the curled portion of an outer cylinder.

[0006]

According to the present invention, only a specific portion of the outer cylinder is dented by using a press or the like, no separate member is required, and the labor and cost for attaching the separate member are not required.
The cost can be reduced. Further, since the protruding portion in which the outer cylinder is recessed serves as a conventional stopper, the displacement of the elastic body is also restricted.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, an elastic body 3 is provided between an inner cylinder 1 and an outer cylinder 2, and two curled portions 4 are provided between the elastic body 3 and the outer cylinder 2 and at opposite positions sandwiching the inner cylinder 1. Has been formed. A projecting portion 6 projecting toward the inner cylinder 1 side is formed by denting the portion of the outer cylinder 2 facing the currant portion 4. As shown in FIG. 2, a central longitudinal section of the outer cylinder 2 has a protrusion 6 formed at a position facing the currant portion 4. When the outer cylinder 2 is made of metal, the protrusion 6 is formed by press molding, and when it is made of synthetic resin, the projection 6 can be easily and quickly formed during injection molding.

The embodiment shown in FIG. 3 shows that the projecting portion 6 is also formed at the base portion of the elastic body 3 to the outer cylinder 2.
With this structure, the rigidity of the elastic body 3 in the extending direction can be improved with a simple structure.

The graph shown in FIG. 4 shows the amount of displacement of the elastic body 3 when a load is applied from directly above the vibration isolator shown in FIG. 1, and is shown by the solid line in the graph in the embodiment of the present invention. Thus, the amount of displacement of the elastic body 3 changes as the load increases. The dotted line shows the case where no such protrusion 6 exists.

[0011]

As described above, according to the present invention, the portion of the outer cylinder facing the blunt portion is dented to form the protrusion protruding toward the inner cylinder. There is no need to prepare and fix or embed this separate member. Therefore, it is possible to reduce the overall cost. Furthermore, the presence of this protrusion makes it possible to regulate the displacement of the elastic body.

[Brief description of drawings]

FIG. 1 is a plan view showing a preferred embodiment of the present invention.

FIG. 2 is a central vertical sectional view of an outer cylinder.

FIG. 3 is a plan view showing another embodiment.

FIG. 4 is a graph showing the displacement of the elastic body with respect to the load with a protrusion formed and one without a protrusion.

FIG. 5 is a plan view showing a conventional example.

[Explanation of symbols]

 1 Inner cylinder 2 Outer cylinder 3 Elastic body 4 Curled part 6 Projection part

Claims (1)

[Claims] 1. A vibration-damping device comprising an elastic body provided between an inner cylinder and an outer cylinder, and a curled portion formed between the inner cylinder and the outer cylinder and having a through hole penetrating along the inner cylinder. An anti-vibration device, characterized in that a protruding portion that protrudes toward the inner cylinder side is formed by denting a portion of the outer cylinder facing the curled portion.