JPH08219210A - Vibration isolating support body - Google Patents

Abstract

PURPOSE: To provide a vibration isolating support body which can be manufactured at a low cost and may not deteriorate the durability of a rubber bush and the riding comfortableness and operation stability of a car. CONSTITUTION: A rubber bush in which a cylindrical sleeve 23 provided with an annular projecting part radially outwardly projected from a cylindrical part is concentrically embedded with a cylindrical rubber elastic body 22 under a non-bonding condition, is fitted in a cylindrical mounting part 12 arranged at least one end part in the shaft direction of a connecting member main body 10 extended between a first member (not shown) and a second member (not shown) so that the outer periphery part of the annular projecting part is strongly fixed by an annular holding part 124 formed at one end part of the annular mounting part. While, the cylindrical sleeve 23 has an engaging recessed part which is radially engaged with the cylindrical rubber elastic body 22 in the cylindrical part, and strongly engagedly fixed to the cylindrical elastic body 22.

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 a vibration-proof 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. 6, one of the rod body portions 81 (coupling members) is used as a coupling rod 80 (vibration support) that 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]

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 connected to each other. A connecting member main body extending between the second members; a tubular mounting portion provided at least at one end of the connecting member main body; and a tubular rubber bush fitted in the tubular mounting portion. The tubular rubber bush is an inner tube, a tubular rubber elastic body fixed to an outer peripheral surface of the inner tube, and a cylindrical rubber elastic body concentric with the tubular rubber elastic body. A tubular sleeve integrally embedded in an adhered state, the tubular sleeve comprising a tubular portion, an annular protrusion protruding radially outward from the tubular portion, and a radius formed in the tubular portion. In the axial direction, the tubular mounting member is engaged with the tubular rubber elastic body, and the tubular mounting member is mounted at one end in the axial direction. Is provided with an annular sandwiching portion having a U-shaped cross-section that grips the outer peripheral edge portion of the annular protruding portion from both ends in the axial direction and covers the outer peripheral edge portion, and the tubular sleeve forms the tubular sleeve. The vibration-damping support is configured to be strongly fixed to the cylindrical mounting portion.

[0009]

As described above, the sleeve, which is integrally embedded in the tubular rubber elastic body of the rubber bush in a non-bonded state, is formed on the tubular portion and the annular projecting portion that projects radially outward from the tubular portion. And an engaging recess that engages with a cylindrical rubber elastic body in the radial direction, and a cylindrical mounting member grips one end in the axial direction and substantially the outer peripheral edge of the annular protrusion from both ends in the axial direction. And an annular sandwiching portion having a U-shaped cross section that covers the outer peripheral edge,
Since the tubular sleeve is fixed to the tubular mounting portion by the annular sandwiching portion, the sleeve can be strongly engaged and fixed to the tubular rubber elastic body without adhering the sleeve, and
The tubular sleeve can be mechanically strongly fixed to the tubular mounting portion. Therefore, it is possible to reduce the press-fitting ratio of press-fitting the rubber bush into the tubular mounting portion,
The strain of the rubber portion with respect to the load in the direction perpendicular to the axis becomes smaller, and the ratio of the torsion spring constant to the spring constant perpendicular to the axis becomes smaller.

[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 1 is provided at one axial end of the lower arm 10.
2 are provided. 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, a cylindrical rubber elastic body 22 integrally vulcanized and bonded on the outer peripheral surface of the inner cylinder 21, and a cylindrical metal concentrically embedded in the rubber elastic body 22 in a non-bonded state. Made sleeve 2
3, the tubular metal sleeve 23 is provided with a plurality of holes 231a (engagement recesses) penetrating the tubular portion 231 in the radial direction, and the tubular rubber elastic body 2 is provided in these holes 231.
Two rubbers are filled and engage with the rubber elastic body 22 by the thickness (radial direction length) of these holes 231a, and are mechanically and strongly fixed to the cylindrical rubber elastic body 22.

The tubular sleeve 23 is devised so that it can be firmly fixed in the tubular mounting portion 12 provided at one axial end of the lower arm 10.

That is, at one end of the tubular sleeve 23 in the axial direction, an annular projecting portion 2 projecting radially outward from the tubular portion 231.
32 is formed, and the outer peripheral edge portion 232 a of the protruding portion 232 is exposed by protruding from the outer peripheral surface of the cylindrical rubber elastic body 22. On the other hand, the tubular mounting portion 12 is provided with a shoulder portion 122 extending outward in the radial direction at one axial end portion thereof to form a large diameter tubular portion 123.

Therefore, when the rubber bush 20 is loosely press-fitted into the tubular mounting portion 12 in the direction shown by the arrow (a), the outer peripheral edge portion 232a is fitted into the large diameter tubular portion 123.
Then, as shown in FIG. 1, the end portion 1 of the large-diameter cylindrical portion 123 is
23a along the outer peripheral edge portion 232a, as shown by the arrow (b), is bent inward in the radial direction, and the outer peripheral edge portion 232.
A is sandwiched between the shoulder portion 122 and the bent portion 125 and caulked from both ends in the axial direction, so that the tubular sleeve 23 has the tubular mounting portion 12
Firmly fixed to the axial end of the tubular mounting portion 12,
An annular sandwich 124 having a U-shaped cross section is formed so as to cover the outer peripheral edge portion 232a of the projecting portion 232.

As described above, the tubular sleeve 23 can be mechanically strongly engaged and fixed to the rubber elastic body 22 without vulcanizing and adhering the tubular sleeve 23 to the rubber elastic body 22. The sleeve 23 can be strongly fixed to the cylindrical mounting portion 12 provided at one end of the lower arm 10 in the axial direction, and as a result, the rubber bush 20 having no outer cylinder can be firmly fixed to the cylindrical mounting portion 12. It is possible to reduce 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, and to reduce the ratio of the torsion spring constant to the spring constant perpendicular to the axis. It was possible to secure riding comfort and steering stability.

In this embodiment, the cylindrical sleeve 23
Has a completely cylindrical shape without cutouts.
It does not matter if the cross section is formed in a C shape as shown in (A) and the notch 25 is formed by cutting from one end to the other end in the axial direction. In this case, the cutout portion 25 also constitutes an “engagement concave portion that engages in the radial direction” in the gist of the present invention, and the tubular sleeve is firmly engaged and fixed to the tubular rubber elastic body by that amount. be able to. Of course, as shown in FIGS. 3B and 3C, the notch 2 is formed at one axial end.
It does not matter if 6, 27 are formed. In this case, the notches 26 and 27 also constitute “engagement recesses that engage in the radial direction” in the gist of the present invention.

Further, as shown in FIG. 4, an annular projecting portion 432 formed at one end of the sleeve 43 in the axial direction of the tubular portion 431.
The outer peripheral edge portion 432a of the above is integrally covered with the rubber elastic body 42 by a thin portion, and is caulked and fixed by an annular holding portion 324 having a U-shaped cross section formed at one axial end of the tubular mounting portion 32. It doesn't matter.

Although the lower arm of the suspension system has been described in this embodiment, the lower arm of the suspension system can be used for the buffer rod of the engine mount system as well as the upper arm and the tension rod.

The present invention can be carried out by appropriately combining the above-mentioned embodiments, and it is also possible to provide an annular projecting portion at the center of the tubular portion, within a range not departing from the gist of the present invention. It can be implemented in many other forms and modes.

[0022]

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 perspective view illustrating another embodiment of the tubular sleeve according to the present invention.

FIG. 4 is a sectional view for explaining another embodiment of the present invention.

FIG. 5 is a sectional view illustrating a conventional example.

FIG. 6 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 23: Cylindrical sleeve 124: Annular clamping part 231a: Hole (engaging recess) 232: Projection 232a: Edge of outer peripheral surface

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 an inner cylinder, a cylindrical rubber elastic body fixed to the outer peripheral surface of the inner cylinder, and a non-adhesive state integrally with the cylindrical rubber elastic body concentrically with the cylindrical rubber elastic body. A tubular sleeve embedded in the tubular portion, wherein the tubular sleeve includes a tubular portion, an annular protrusion protruding radially outward from the tubular portion, and the tubular sleeve formed in the tubular portion in a radial direction. -Shaped rubber elastic body and an engaging recessed portion that engages with the rubber-shaped elastic body, and the cylindrical mounting member is substantially axially formed at one end in the axial direction. An outer peripheral edge portion of the projecting portion is held from both ends in the axial direction, and an annular clamp portion having a U-shaped cross section is provided to cover the outer peripheral edge portion, and the tubular sleeve causes the tubular sleeve to have the tubular shape. An anti-vibration support body which is strongly fixed to the mounting portion.