JPH08219212A - Anti-vibration support - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] To provide an anti-vibration support that is inexpensive and does not impair the durability of the rubber bush and the riding comfort and steering stability of the vehicle. [Structure] An inner cylinder 21 is provided in a cylindrical mounting portion 12 provided at least at one axial end of a connecting member body 10 extending between a first member (not shown) and a second member (not shown). A rubber bush made up of a cylindrical rubber elastic body 22 fixed to the outer peripheral surface of the inner cylinder is fitted into the cylindrical rubber elastic body 2.
The thick annular protrusions 222, 222 protruding outward in the radial direction, which are provided at both axial end portions, are formed by the annular clamping portions 125, 125 formed at the axial end portions of the tubular mounting portion. It is strongly held.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention connects a first member and a second member by interposing bushes at both ends in the axial direction,
The present invention relates to an anti-vibration support for suppressing impact and vibration between the first member and the second member. More specifically, the present invention relates to an anti-vibration support suitably used for a control arm and a tension rod of a suspension system of a vehicle, a buffer rod of an engine mount system, and the like.

Conventionally, such an anti-vibration support is first provided at one end of a lower arm 60 connecting a knuckle and a vehicle in a suspension system, as described in Japanese Utility Model Laid-Open No. 172558/1984. Eyeball part 6
1 (cylindrical mounting portion), an inner tubular metal fitting 71, an outer tubular metal fitting concentrically arranged outside the inner tubular metal fitting 71, and a tubular shape arranged between the inner and outer tubular metal fittings 71, 72. It is known that a tubular rubber bush 70 formed by integrally vulcanizing and adhering the rubber elastic body 73 of FIG.

In this case, since the outer cylindrical metal fitting 71 fixed to the outer peripheral surface of the rubber elastic body 73 is provided, the rubber bush 70 can be press-fitted and fixed in the eyeball portion 61 with a small press-fitting rate, and the hysteresis can be reduced. Although it is possible to ensure the durability of the bush and the riding comfort and steering stability of the car, it has the disadvantage of requiring a process for fixing the outer tubular metal member and the rubber elastic body, which is expensive. .

Further, Japanese Utility Model Publication No. 64-1026 discloses that
As shown in FIG. 4, one of rod body 81 (coupling member) is used as a coupling rod 80 (vibration support) which is interposed between an engine and a vehicle body of an automobile and regulates excessive displacement of the engine. It is known that a tubular rubber bush 90 is press-fitted into a small diameter tubular portion 82 (one tubular mounting portion) provided at an end portion. The tubular rubber bush 90 in this case is composed of an inner tubular metal piece 91 and a tubular rubber elastic body 93 vulcanized and bonded to the outer peripheral surface thereof.

Therefore, in the latter case, since the outer cylinder fitting is not required, not only the outer cylinder fitting but also the step of bonding the outer fitting is unnecessary, and the vibration-proof support can be provided at a low cost. In the case of, the press-fitting rate must be set large so that the rubber bush 90 does not slip when the maximum torsion angle acts (20% of the outer diameter of the rubber bush 90 relative to the diameter of the tubular mounting portion). Reduce the diameter above and press fit). For this reason, there is a drawback in that the distortion of the rubber portion becomes large and the durability of the rubber bush 93 is inferior to the former, especially with respect to a load perpendicular to the axis.

Further, in the latter case, since the outer peripheral surface of the cylindrical rubber elastic body 93 is not adhered, the ratio of the torsion spring constant to the axial right angle spring constant becomes large and the hysteresis becomes large. It has the drawback of being inferior to the former in sex.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances and is an inexpensive vibration-proof support that does not impair the durability of the rubber bush and the riding comfort and steering stability of the vehicle. Intended to provide the body.

[0008]

In order to achieve the above-mentioned object, the present invention provides a vibration-proof support for connecting a first member and a second member by interposing bushes at both ends in the axial direction. And a connecting member main body extending between the first member and the second member, a cylindrical mounting portion provided at at least one end of the connecting member main body, and a fitting member fitted in the cylindrical mounting portion. And a cylindrical rubber elastic body fixed to the outer peripheral surface of the inner cylinder, wherein the cylindrical rubber elastic body is in the axial direction. Both ends are integrally provided with a thick annular protrusion projecting outward in the radial direction, and the tubular mounting portions cover the outer periphery of the thick annular protrusion at both axial ends and the thickness. An annular narrow fitting portion having a U-shaped cross section for gripping a thick annular protruding portion from both ends in the axial direction is provided. Is obtained by constituting the vibration-damping support body characterized in that more tubular rubber elastic body is strongly held to the cylindrical mounting portion.

[Action]

As described above, the cylindrical rubber bush is composed of the inner cylinder and the cylindrical elastic member fixed to the outer peripheral surface of the inner cylinder. The cylindrical elastic member is radially outward at both ends in the axial direction. Integrally formed with a thick annular protrusion, and a cylindrical mounting portion provided at one end in the axial direction of the connecting member main body is provided at both axial ends with a thick annular protrusion at both axial ends. And an annular narrow fitting portion having a U-shaped cross section which covers the outer circumference of the thick annular projecting portion and is strongly held by the annular narrow fitting portion in the tubular mounting portion. Therefore, even if the press-fitting ratio of the rubber bush to the tubular mounting part is reduced, slippage can be prevented from twisting. By reducing the press-fitting ratio in this way, the load in the direction perpendicular to the axis can be reduced. On the other hand, the strain of the rubber elastic body is reduced and the torsion spring with respect to the axial constant spring constant is Ratio of the number is small.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. In the figure, 10 is a lower arm in an automobile, and a cylindrical mounting portion 12 is provided at one axial end of the lower arm 10. More specifically, the lower arm 10 is constructed by welding the tubular mounting portion 12 to one end of the arm 11. A similar cylindrical mounting portion is also welded to the other end of the arm 10 so as to be pivotally supported on the vehicle body (second member) via a bush (not shown).

Here, the lower arm 10 constitutes a typical example of the "connecting member body" in the gist of the present invention.
Of course, it does not matter if the arm 11 and the tubular mounting portion 12 are integrally formed.

In the tubular mounting portion 12, an independent tubular rubber bush 20 as shown in FIG. 2 is strongly held,
A vibration proof support body 100 is configured so that it can be pivotally supported via the bush 20 to a knuckle (not shown) having an axle for supporting a rear wheel as a second member.

Specifically, first, as shown in FIG. 2, the rubber bush 20 includes a metal inner cylinder 2 disposed in the innermost portion.
1 and a cylindrical rubber elastic body 22 integrally vulcanized and adhered to the outer peripheral surface of the inner cylinder 21. The cylindrical rubber elastic body 22 is provided at both axial end portions from the central portion 221. Also, annular projecting portions 222, 222 projecting outward in the radial direction are integrally formed. On the other hand, the central tubular portion 12 is provided at both axial ends of the tubular mounting portion 12 provided at one end portion of the lower arm 10.
1, large diameter cylindrical portions 123, 123 are provided by providing shoulder portions 122, 122 extending radially outward from 1.

Therefore, the bush 20 is attached to the cylindrical mounting portion 1
2, the central portion 221 is loosely fitted to the central tubular portion 121, and the annular protruding portions 222, 2
22 is loosely fitted to the large-diameter cylindrical portions 123, 123 at both ends. That is, the bush 20 is fitted in the tubular mounting portion 12 with a small compression rate.

Thereafter, as shown in FIG. 1, both ends (shown by two-point sharp lines) 123a, 123a of the large-diameter cylindrical portions 123, 123 of the respective cylindrical mounting portions 12 are cylindrical rubber elastic bodies. Folded portions 124, 124 are formed along the both end faces 223, 223 of the groove 22 in the radial direction, and the bent portions 124, 124 and the shoulder portions 122, 122 are formed.
Between the thick annular protrusions 222 and 222 in the axial direction, the annular sandwiching portion having a U-shaped cross section that covers the outer periphery of the thick annular protrusions 222 and 222. 125, 125 are formed, the rubber bush 20
Is strongly held by the tubular mounting portion 12.

Therefore, even if the tubular rubber bush 20 is fitted in the tubular mounting portion 12 with a small compression rate, the thick annular protrusions 22 are formed at both axial ends of the rubber elastic body.
Since the Nos. 2 and 222 are caulked and fixed by the annular clamps 125 and 125, respectively, even if the maximum torsion angle acts,
The rubber bush 20 does not slip on the tubular mounting portion 12. Therefore, the strain of the rubber portion of the cylindrical rubber elastic body 22 with respect to the load in the direction perpendicular to the axis can be reduced, and the ratio of the torsion spring constant to the spring constant perpendicular to the axis can be reduced, thereby improving the durability of the rubber bush 20 and the vehicle. It was possible to secure riding comfort and steering stability.

Although the lower arm of the suspension system has been described in this embodiment, the lower arm of the suspension system can be used not only for the upper arm and the tension rod but also for the buffer rod of the engine mount system.

The present invention is not limited to this embodiment. For example, it goes without saying that it is possible to make the thicknesses of the thick annular projections different from each other. It can be embodied in many other forms and modes without departing from the gist of the present invention, such as embedding a restraint member and increasing the holding force of a thick annular protrusion by an annular narrow attachment. can do.

[0019]

According to the present invention, it is possible to provide an anti-vibration support which is inexpensive and which does not impair the durability of the rubber bush and the riding comfort and steering stability of the vehicle.

[Brief description of drawings]

FIG. 1 is a partially omitted view showing a cross section of a main part of one embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part for explaining the assembly of the tubular rubber bush and the connecting member body according to FIG.

FIG. 3 is a sectional view illustrating a conventional example.

FIG. 4 is a sectional view illustrating another conventional example.

[Explanation of symbols]

10: Connection member main body 12: Cylindrical mounting part 20: Rubber bush 21: Inner cylinder 22: Cylindrical rubber elastic body 222: Annular protruding part 24: Annular clamping part

Claims (1)

[Claims] 1. A vibration isolating support for connecting a first member and a second member by interposing bushes at both ends in the axial direction, wherein the first member and the second member are provided. A connecting member main body extending between the connecting member main body, a tubular mounting portion provided at at least one end of the connecting member main body, and a tubular rubber bush fitted in the tubular mounting portion. The rubber bush of is composed of an inner cylinder and a cylindrical rubber elastic body fixed to the outer peripheral surface of the inner cylinder. The thickness of the cylindrical rubber elastic body protruding outward in the radial direction at both axial ends. A thick annular protrusion is integrally provided, and the tubular mounting portion covers both ends in the axial direction of the thick annular protrusion and the thick annular protrusion from both ends in the axial direction. An annular narrow attachment portion having a U-shaped cross section for gripping is provided, and the tubular rubber elastic body is attached to the tubular attachment portion by the annular narrow attachment portion. An anti-vibration support body that is strongly held in the shock absorber.