JP2000329180A - Anti-vibration bush - Google Patents

Abstract

(57) [Problem] To provide an anti-vibration bush having a stopper portion having a high axial spring characteristic. SOLUTION: The anti-vibration bush includes a cylindrical shaft fitting 11,
A cylindrical outer fitting 12 having an annular flange portion 13 disposed radially outward between both ends of the shaft fitting and extending radially outward at one end, and a tube interposed between the shaft fitting and the outer fitting. An annular metal plate 27 is coaxially embedded in an annular rubber elastic plate 21 provided with a bush body 10 provided with a rubber elastic body 14 in a ring shape, and is fitted to the annular flange side of the shaft fitting to form an annular ring. A stopper member facing the flange portion. The outer fitting is attached to the other cylindrical member by press fitting. The outer diameter of the flange portion is larger than the outer diameter of the mating cylindrical member, and the annular metal plate extends inward and outward across the flange portion in the radial direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration bush, and more particularly to an anti-vibration bush suitable for being mounted on a suspension mechanism of an automobile.

[0002]

2. Description of the Related Art Conventionally, as a vibration isolating bush of this kind,
For example, as shown in FIGS. 7 and 8, an outer fitting 2 having a cylindrical shaft fitting 1 and an annular flange portion 3 disposed radially outward between both ends thereof and extending radially outward at one end. And a cylindrical rubber elastic body 4 interposed between the shaft fitting 1 and the outer fitting 2
And an annular stopper 4 made of an annular rubber elastic body and disposed between the outer metal fitting 2 and one end of the shaft metal fitting 1 so as to be continuous with the rubber elastic body 4 in the axial direction. The anti-vibration bush is formed by connecting the outer fitting 2 to a semi-trailing arm eye 6.
And is mounted on the vehicle by inserting the shaft fitting 1 into a vehicle body-side member (not shown) with bolts. The rubber elastic body 4 has a spring characteristic against vibration input in the radial direction. The vibration is attenuated, and the vibration is attenuated by the spring characteristics of the stopper portion 5 with respect to the vibration input in the axial direction.

[0003]

However, in the case of the vibration-proof bush, since the rubber elastic body 4 and the stopper portion 5 are simultaneously formed integrally and vulcanized, the rubber elastic body 4 has a soft spring characteristic. Only the spring characteristic of the stopper 5 could not be hardened. Further, since the amount of rubber of the stopper portion 5 is also limited by the outer diameter of the flange portion 3,
Could not increase it. Therefore, there is a problem that the spring characteristics of the stopper portion 5 in the axial direction cannot be enhanced. An object of the present invention is to solve the above-mentioned problem, and an object of the present invention is to provide an anti-vibration bush having a stopper portion having high axial spring characteristics.

[0004]

In order to achieve the above object, a structural feature of the invention according to the first aspect is that a cylindrical shaft fitting and a radially outer portion are disposed between both ends of the shaft fitting. A cylindrical outer fitting having an annular flange extending radially outward on one end side; a rubber elastic body interposed between the shaft fitting and the outer fitting; and a coaxial ring-shaped rubber elastic body plate. And a stopper member which is fitted on the side of the annular flange portion of the shaft fitting and is disposed so as to face the axial direction of the annular flange portion. The outer diameter of the flange portion is made larger than the outer diameter of the mating cylindrical member, and the annular metal plate extends radially inward and outward across the flange portion. It is in.

According to the first aspect of the present invention, the stopper member and the rubber elastic body are formed separately and independently, so that the rubber hardness of the stopper member can be made harder than that of the rubber elastic body. , Its spring characteristics can be enhanced. Further, by making the outer diameter of the flange portion larger than the outer diameter of the mating cylindrical member, the amount of rubber of the stopper member provided outside the flange portion can be increased, and the spring characteristics thereof can be further improved. it can. Furthermore, since the annular metal plate extends inward and outward across the opposed flange portions in the radial direction, the rubber layer provided between the two effectively utilizes the radial width of the flange portions to the utmost. Spring characteristics can be enhanced. Also, the rubber layer provided on the outer side in the axial direction of the annular metal plate can receive vibration input by effectively utilizing the large-area annular metal plate.
This rubber layer can effectively enhance the axial spring characteristics.

[0006] Further, the structural feature of the invention according to claim 2 is the vibration-isolating bush according to claim 1.
The thickness of the rubber elastic body plate in the axial direction outside the annular metal plate is smaller than the thickness in the axial direction inside of the annular metal plate. By configuring the invention according to claim 2 as described above, the rubber elastic body plate portion axially outside the annular metal plate has a small thickness and a large area by the annular metal plate. Can be hardened, and the spring characteristics of the stopper member can be further enhanced.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 and FIG. 2 show a vibration isolating bush for a semi-trailing arm of an automobile according to one embodiment, by a side view and a sectional view. This anti-vibration bush is provided with a bush body 10 and a stopper member 20 attached to one end in the axial direction.

As shown in FIGS. 3 and 4, the bush body 10 is disposed radially outward between both ends of the cylindrical bracket 11 and radially outward at one end. Cylindrical outer fitting 12 having an annular flange portion 13 extending to the outside
And a cylindrical rubber elastic body 14 interposed between the shaft fitting 11 and the outer fitting 12. The outer fitting 12 has an outer diameter slightly larger than an inner diameter of an arm eye M of a semi-trailing arm described later, and an outer diameter of the annular flange portion 13 is larger than an outer diameter of the arm eye M. The rubber elastic body 14 is formed in a substantially cylindrical shape (not shown) by vulcanization molding on an outer peripheral surface of the shaft fitting 11 at an intermediate portion excluding both end sides, and has a length equal to that of the outer fitting 12.
Is substantially equal to the length in the axial direction. Then, the shaft fitting 11 in which the rubber elastic body 14 is vulcanized is inserted into the outer fitting 12, and the outer fitting 12 is subjected to drawing processing to reduce the diameter, thereby forming the bush main body 10. However, after the rubber elastic body 14 is formed separately from the shaft fitting 11, the rubber elastic body 14 may be externally fixed to the shaft fitting 11.

As shown in FIGS. 5 and 6, the stopper member 20 has a rubber elastic plate 21 which is a thick plate made of an annular rubber elastic material, and a ring embedded in the rubber elastic plate 21 coaxially. A metal plate 27 is provided. The rubber elastic body plate 21 has elliptical concave portions 22 slightly recessed toward the center at four equally-spaced portions in the circumferential direction on the outer peripheral edge, at which the annular metal plate 27 is slightly exposed. are doing. In addition, recess 2
At four locations on the outer peripheral edge orthogonal to 2, there are provided protrusions 23 which are substantially triangular thin plates protruding in the radial direction on one surface side A (the surface shown in FIG. 5) of the rubber elastic body plate 21. Further, an arc-shaped positioning convex portion 24 is provided slightly inside the projecting portion 23 along the inner peripheral edge of the annular metal plate 27. The inner diameter of the positioning projection 24 is substantially the same as the outer diameter of the annular flange 13. Further, four small holes 25a and 25b are provided at substantially middle positions in the radial direction corresponding to the protruding portions 23 on both surfaces of the rubber elastic body plate 21, respectively. A notch 26 is provided on the inner peripheral edge of one surface side A of the rubber elastic body plate 21 to facilitate the insertion of the stopper member 20 into the shaft fitting 11.

The annular metal plate 27 is an annular thin plate having an outer diameter larger than the outer diameter of the annular flange 13, an inner diameter smaller than the inner diameter of the annular flange 13, and a radial width. It is larger than the radial width of the annular flange portion 13. As shown in FIG. 6, the annular metal plate 27 is axially moved in the rubber elastic body plate 21 in the other surface side B (FIG. 5).
(Opposite the surface shown). Therefore, the thickness of the rubber layer 21b between the annular metal plate 27 and the other surface side B is smaller than the thickness of the rubber layer 21a between the annular metal plate 27 and the one surface side A. The stopper member 20 is formed by performing rubber vulcanization molding with the annular metal plate 27 set in a mold. The recess 22 and the small holes 25a, 2
5b is formed by a projection provided on the mold to support the annular metal plate 27 at a predetermined position in the mold during vulcanization molding.

A stopper member 20 is attached to the shaft fitting 11 of the bush body 10 from the side of the annular flange portion 13 of the outer fitting 12.
Is inserted into the stopper member 20 with its one surface side A facing the annular flange portion 13.
Is fixed to the shaft fitting 11 through a very small gap in contact with the annular flange portion 13 and is formed as an anti-vibration bush.

As shown in FIG. 2, the annular metal plate 27 of the stopper member 20 is disposed so as to face the annular flange portion 13 of the outer metal fitting 12, and its outer periphery is radially larger than the outer peripheral position of the flange portion 13. It is located outward, and its inner periphery is located radially inward from the inner periphery of the annular flange portion 13. That is, the annular metal plate 27 is arranged in a state of straddling the annular flange portion 13 in the radial direction.

The anti-vibration bush is fixed by press-fitting the outer metal fitting 12 into a semi-trailing arm eye M of the automobile, and the shaft metal fitting 11 is sandwiched between U-shaped fixing members (not shown) on the vehicle body side. It is assembled by being fixed with bolts. Thereby, the stopper member 20 is disposed between the annular flange portion 13 and the fixing member. In addition, as shown in FIG.
The outer peripheral edge of 3 protrudes from the outer peripheral surface of the arm eye M.

In the vibration isolating bush configured as described above,
Since the stopper member 20 and the rubber elastic body 14 are formed separately, the rubber hardness of the stopper member 20 can be hardened separately from that of the rubber elastic body 14, thereby improving the spring characteristics. Further, by making the outer diameter of the annular flange portion 13 larger than the outer diameter of the arm eye M, the stopper member 20 disposed outside the annular flange portion 13 is formed.
Can be increased, and its spring characteristics can be further enhanced. Further, the annular metal plate 27 embedded in the stopper member 20 is connected to the opposed annular flange portion 13.
, And extends inward and outward in the radial direction, so that the radial width of the annular flange portion 13 can be maximized and the spring characteristics can be effectively enhanced by the rubber layer 21a provided therebetween. . Also, the thin rubber layer 21b provided on the outer side in the axial direction of the annular metal plate 27 can effectively utilize the large-area annular metal plate 27, and thus effectively acts to enhance the axial spring characteristics. As a result, in the present embodiment, the spring characteristics in the axial direction of the entire stopper member 20 are greatly improved as compared with the related art.

Although the anti-vibration bush is used for mounting the semi-trailing arm in the above embodiment, the present invention is not limited to this and can be applied to other similar uses. The anti-vibration bush described in the above embodiment is an example, and can be implemented in various forms without departing from the gist of the present invention.

[0016]

According to the first aspect of the present invention, the outer diameter of the flange portion is made larger than the outer diameter of the other cylindrical member, and the amount of rubber of the stopper member provided outside the flange portion is increased.
In addition, the annular metal plate extends radially inward and outward across the opposing flange, so that the radial width of the flange is maximized and the rubber layer provided between the two maximizes the spring characteristics. Can be increased. Also, the rubber elastic body plate provided on the outer side in the axial direction of the annular metal plate can effectively utilize the annular metal plate having a large area, so that the rubber layer can effectively enhance the axial spring characteristics. Also,
According to the second aspect of the present invention, since the rubber elastic body plate portion axially outward from the annular metal plate has a small thickness and a large area formed by the annular metal plate, the axial rubber characteristics of this portion are hardened. The spring characteristics of the stopper member can be further enhanced.

[Brief description of the drawings]

FIG. 1 is a side view showing an anti-vibration bush according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the vibration-isolating bush taken along the line II-II shown in FIG.

FIG. 3 is a side view showing a bush body of the vibration-isolating bush.

FIG. 4 is an axial sectional view showing the bush main body.

FIG. 5 is a side view showing one surface side of a stopper member of the vibration isolating bush.

6 is a sectional view of the stopper member taken along line VI-VI shown in FIG. 5;

FIG. 7 is a side view showing a conventional anti-vibration bush.

8 is a cross-sectional view of the vibration-isolating bush taken along the line VIII-VIII shown in FIG. 7;

[Explanation of symbols]

10: Bush body, 11: Shaft fitting, 12: Outer fitting,
13: annular flange portion, 14: rubber elastic body, 20: stopper member, 21: rubber elastic body plate, 27: annular metal plate, M
... arm eye.

Claims (2)

[Claims] A cylindrical outer fitting having an annular flange disposed radially outward between both ends of the cylindrical fitting and extending radially outward at one end; A rubber elastic body interposed between a shaft fitting and an outer metal fitting, an annular metal plate is coaxially embedded in an annular rubber elastic body plate, and is fitted externally to the annular flange side of the shaft fitting. A stopper member disposed to face the annular flange portion in the axial direction,
The outer fitting is a vibration-isolating bush that is mounted by press-fitting on a mating cylindrical member, and the outer diameter of the flange portion is made larger than the outer diameter of the mating cylindrical member, and the annular metal plate forms the flange portion. An anti-vibration bush that extends inward and outward across the radial direction. 2. The method according to claim 1, wherein the thickness of the rubber elastic body plate in the axial direction outside the annular metal plate is smaller than the thickness of the annular metal plate in the axial direction inside. Anti-vibration bush as described.