JPH1193998A - Vibration isolating mount - Google Patents

Abstract

PROBLEM TO BE SOLVED: To release a distortion at drawing work time of a rubber elastic unit and to reduce a cost of manufacture, in a vibration isolating mount for a suspension having a toe correct mechanism. SOLUTION: In a vibration isolating mount forming a protruded part 4 outward from partly an inner cylinder 1, forming partly this protruded part 4 in a tilt surface 4a tilted relating to an axial direction of an outer cylinder 2, on the other hand, forming a separate tilt surface 2a opposed to the tilt surface 4a of this protruded part 4 partly in the outer cylinder 2, and interposing a rubber elastic unit 3 between these opposed tilt surfaces 2a, 4a, a stopper member 5 protruded outward from the inner cylinder 1 to limit displacement in a shaft right angle direction of this inner cylinder 1 is separated in a required axial direction from the tilt surface 4a of the protruded part 4, and by synthetic resin, through a cylindrical part 6 externally fitted to the inner cylinder 1, the stopper member is integrally formed with the protruded part 4, between these stopper member 5 and protruded part 4, the rubber elastic unit 3 is interposed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration mount for a suspension such as a bush used for a vehicle suspension.

[0002]

2. Description of the Related Art In general, an anti-vibration mount (bush) for absorbing vibration is provided at a mounting portion on a vehicle body side of a vehicle suspension device. This anti-vibration mount
The inner and outer cylindrical bodies are connected by rubber elastic bodies.However, in order to improve vibration isolation and improve steering stability and ride comfort, the tires are not affected by lateral forces such as cornering forces. You need to control the movement.

In order to satisfy this property, for example, Japanese Unexamined Patent Publication No.
As shown in -268020 or the like, an anti-vibration mount having a toe-collecting mechanism in which an inner cylinder is displaced in a front-rear direction with respect to a left-right input has already been proposed.

As an anti-vibration mount having such a mechanism, for example, as shown in FIG. 3, an inner cylinder 1, an outer cylinder 2 surrounding the inner cylinder 1 coaxially, and the inner cylinder 1 connected between the inner and outer cylinders 1, 2 are connected. A projection 4 'is formed outwardly from a part of the inner cylinder 1; and the lower surface of the projection 4' is inclined with respect to the axial direction of the outer cylinder 2. Face 4
a ', while another inclined surface 2a facing the inclined surface 4a' of the protruding portion 4 'is formed in a part of the outer cylinder 2, and the inclined surface 2a is located between the opposed inclined surfaces 2a, 4a'. It is well known that a rubber elastic body 3 is interposed.

In this suspension anti-vibration mount,
The rubber elastic body 3 interposed between the opposed inclined surfaces 2a, 4a 'causes a component force in the direction perpendicular to the axis to be applied to the axial direction input to the inner cylinder 1 and the outer cylinder 2, thereby forming the inner cylinder. Are also displaced in the direction perpendicular to the axis. That is, an anti-vibration mount (bush) having such a configuration
By attaching M to the tip of the trailing arm A of a torsion beam type suspension as shown in FIG. 4, for example, a spring (front and rear) is soft against vibration (load) input from the road surface via wheels. The characteristics can be formed, and the rigidity can be kept high in the left-right direction (lateral direction), so that it is possible to satisfy both the performance of riding comfort and the stability of driving. . In FIG. 3, reference numeral 5 'denotes a rubber stopper member for limiting displacement of the inner cylinder in a direction perpendicular to the axis, and is attached by press-fitting to the inner cylinder 1.

[0006]

By the way, even in a vibration isolating mount having such a toe-collecting mechanism, an outer cylinder is required to apply a pre-compression to a rubber elastic body 3 interposed between an inner cylinder 1 and an outer cylinder 2. 2 is subjected to a drawing process. When the outer cylinder 2 is compressed in a radially inward direction with respect to the rubber elastic body 3 interposed between the opposed inclined surfaces 2a, 4a ', the inner cylinder is caused by the reaction force of the rubber. 1 moves upward in the drawing, it is difficult to apply the pre-compression, and the movement of the inner cylinder 1 exerts a tensile force on the outer peripheral portion 3a of the rubber elastic body 3, and the strain due to this tensile force is reduced by the rubber elastic body 3 Has the problem of reducing the durability of the

The present invention addresses such a situation and utilizes a stopper member for limiting the displacement of the inner cylinder, and further finds a new configuration in the peripheral portion thereof, thereby reducing distortion during drawing of the rubber elastic body. It is another object of the present invention to manufacture the anti-vibration mount including the stopper member at low cost.

[0008]

That is, an anti-vibration mount according to the present invention which meets the above object is provided with an inner cylinder, an outer cylinder coaxially surrounding the inner cylinder, and a connection between the inner and outer cylinders. Formed from a part of the inner cylinder outward, and at least one of the upper surface and the lower surface of the projection is formed on an inclined surface inclined with respect to the axial direction of the outer cylinder. On the other hand, another part of the outer cylinder is formed with another inclined surface facing the inclined surface of the protruding portion, and in the vibration-proof mount in which the rubber-like elastic body is interposed between the opposed inclined surfaces, A cylinder projecting outward from the inner cylinder and limiting the displacement of the inner cylinder in a direction perpendicular to the axis by a predetermined distance in the axial direction from the inclined surface of the protruding portion, and externally fitted to the inner cylinder by a synthetic resin. Formed integrally with the protruding part via the Characterized in that allowed interposing the rubber-like elastic body between the topper member and the projecting portion.

[0009]

In the vibration-proof mount of the present invention, the force applied to the rubber-like elastic body when the outer cylinder is subjected to the drawing process is:
Since the inner cylinder is received by the inclined surface of the protruding portion of the inner cylinder and the surface on the protruding portion side of the stopper member, the inner cylinder is less likely to move upward as compared with the conventional case, and the rubber-like elastic body is easily pre-compressed. At the same time, the distortion due to the tensile force of the conventional rubber-like elastic body outer peripheral portion is significantly reduced, thereby making it possible to greatly improve the durability of the anti-vibration mount.

[0010] Further, by integrally molding the projecting portion and the stopper member for the above-mentioned collect mechanism with a synthetic resin, the manufacturing cost of these two members can be reduced, and in the past, they were separately mounted by welding or press fitting. These two members can be simply and inexpensively attached in a single step of externally fitting the inner cylinder, without requiring positioning between the two members.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
An embodiment of the present invention will be described.

FIG. 1 is a sectional view showing an anti-vibration mount (bush) for a suspension according to an embodiment of the present invention.

As shown in FIG. 1, the anti-vibration mount includes an upright inner cylinder 1, an outer cylinder 2 surrounding the inner cylinder 1 coaxially and concentrically, and a space between the inner cylinder 1 and the outer cylinder 2. And a rubber elastic body 3 which is vulcanized and bonded to connect the two. As shown in FIG. 2, a fan-shaped protrusion 4 is formed outward from the upper end of the inner cylinder 1.
Is formed on an inclined surface 4a inclined with respect to the axial direction of the outer cylinder 2, and another inclined surface 2a facing the inclined surface 4a of the projection 4 is formed on a part of the outer cylinder 2. The rubber elastic body 3 is interposed between the two inclined surfaces 4a and 2a by vulcanization bonding. Note that the inclined surfaces 2a, 4a and the protruding portion 4 are formed only on one side of the mount centering on one radial direction of the inner cylinder 1, as also partially shown in FIG.

On the other hand, in the anti-vibration mount according to the embodiment of the present invention, in addition to the above structure, a stopper which projects outward from the inner cylinder 1 to limit the displacement of the inner cylinder 1 in the direction perpendicular to the axis, as shown in the drawings. The member 5 is formed. The stopper member 5 is integrally formed with the protruding portion 4 by a synthetic resin through a tubular portion 6 which is fitted to the inner cylinder 1 so as to be separated from the inclined surface 4a of the protruding portion 4 in a required axial direction. Is formed. The rubber elastic body 3 is interposed between the stopper member 5 and the protruding portion 4 by being vulcanized and bonded in a continuous state from between the inclined surfaces 4a and 2a.

In the anti-vibration mount of the above embodiment, the rubber elastic body 3 is vulcanized and bonded between the inner and outer cylinders 1 and 2 and then the outer cylinder 2 is pre-compressed to the rubber elastic body 3.
In this case, the force P applied to the rubber elastic body 3 is applied to the inclined surface 4a of the projection 4 of the inner cylinder 1 and the projection of the stopper member 5 as shown in FIG. 4 side surface 5
a, the inner cylinder 1 is less likely to move upward as compared with the prior art, so that the pre-compression of the rubber elastic body 3 is easily applied, and the distortion due to the pulling force of the rubber elastic body outer peripheral portion 3a is also remarkable. This makes it possible to greatly improve the durability of the anti-vibration mount.

Further, by integrally forming the projecting portion 4 and the stopper member 5 for the above-mentioned torrect mechanism with a synthetic resin, the manufacturing cost of these two members can be reduced, and conventionally, they are separately mounted by welding or press fitting. The two members 4 and 5 can be easily and inexpensively mounted in a single step such as externally fitting and bonding to the inner cylinder, and without the need for positioning between the two members. Although the embodiment of the present invention has been described above, the rubber elastic body 3 can be replaced by another elastic body such as synthetic rubber.

[0017]

As described above, in the anti-vibration mount of the present invention, a projection is formed outward from a part of the inner cylinder, and a part of the projection is inclined with respect to the axial direction of the outer cylinder. In this case, another inclined surface facing the inclined surface of the protrusion is formed on a part of the outer cylinder, and a rubber-like elastic body is interposed between the opposed inclined surfaces. In the vibration mount, a stopper member that protrudes outward from the inner cylinder and limits displacement of the inner cylinder in a direction perpendicular to the axis is separated from the inclined surface of the protruding portion in the required axial direction, and is attached to the inner cylinder by a synthetic resin. It is formed integrally with the protruding part via the cylindrical part to be fitted, and the rubber-like elastic body is interposed between these stopper members and the protruding part, and when the outer cylinder is subjected to drawing processing, The force applied to the rubber-like elastic body is applied to the inclined surface of the protrusion of the inner cylinder and the stopper. The inner cylinder is less likely to move upward as compared to the conventional case, so that the pre-compression of the rubber-like elastic body is easily applied, and the outer peripheral portion of the conventional rubber-like elastic body is received. Distortion due to the pulling force is also significantly reduced, which makes it possible to greatly improve the durability of the anti-vibration mount. In addition, the projecting portion and the stopper member for the above-mentioned collect mechanism are integrally formed of synthetic resin. In addition to reducing the manufacturing cost of these two members, these two members, which were conventionally attached separately by welding or press-fitting, can be fitted to the inner cylinder in a single step, and positioning between the two members is unnecessary. It has a remarkable effect of being attached easily and at low cost.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a suspension anti-vibration mount according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a toe-collecting protrusion and a stopper member by integral molding of the embodiment.

FIG. 3 is a cross-sectional view showing a conventional anti-vibration mount for suspension having a toe correct mechanism.

FIG. 4 is a plan view of a suspension device showing an example of mounting the anti-vibration mount.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inner cylinder 2 Outer cylinder 2a Inclined surface 3 Rubber (form) elastic body 3a Outer peripheral portion of rubber elastic body 4 Projection 4a Inclined surface 5 Stopper member 5a Upper surface of stopper member 6 Cylindrical portion

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Toshihiro Kakimoto 1-17-18 Edobori, Nishi-ku, Osaka City Inside Toyo Gum Industries Co., Ltd. (72) Inventor Michihiro Kawada 1-17-18 Edobori, Nishi-ku, Osaka Toyogo Mu Kogyo Co., Ltd.

Claims (1)

[Claims] 1. An inner cylinder, an outer cylinder coaxially surrounding the inner cylinder, and a rubber-like elastic body provided between the inner and outer cylinders so as to connect the inner cylinder and the inner cylinder. A projecting portion is formed, and at least one of the upper surface and the lower surface of the projecting portion is formed as an inclined surface inclined with respect to the axial direction of the outer cylinder, while a part of the outer cylinder faces the inclined surface of the projecting portion. In an anti-vibration mount in which another inclined surface is formed and the rubber-like elastic body is interposed between these opposed inclined surfaces,
A cylinder that projects outward from the inner cylinder and limits the displacement of the inner cylinder in a direction perpendicular to the axis by a predetermined distance in the axial direction from the inclined surface of the projection, and is externally fitted to the inner cylinder by a synthetic resin. An anti-vibration mount characterized by being formed integrally with the protruding portion via a protruding portion and interposing the rubber-like elastic body between the stopper member and the protruding portion.