JPH03213736A - Automobile suspension bush - Google Patents

Abstract

PURPOSE:To facilitate assembling and improve a spring characteristic by providing protrusions on both sides of an inner bush, and providing an outer bush with fitting grooves matching the protrusions as well as with an intermediate plate buried therein. CONSTITUTION:In an inner bush 5, an rubber like elastic body 4a is provided with protrusions 7 on both sides with an inner cylinder 1 interposed in between, and the rubber like elastic body 4b of an outer bush 6 is provided with fitting grooves 8 in the corresponding positions to the protrusions 7. An intermediate plate 3 of circular arc shaped cross section is further buried into the elastic body 4b on one side of the outer bush 6. Assembling is performed by setting the protrusions 7 of the inner bush 5 to the fitting grooves 8 of the outer bush 6 for press-fitting or press-bonding, so that assembling is facilitated, as well as a spring characteristic is improved by the intermediate plate 3 and the elastic bodies 4a, 4b.

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to improvements in rubber bushings used in automobile suspensions.

[Conventional technology]

As shown in FIG. 5, a rubber bush used for a pivot connection part of a vehicle suspension, etc. has an inner cylinder (11),
The outer cylinder (12) and the intermediate plate (13) are rubber-molded onto a body to form a rubber-like elastic body (14), and the outer cylinder (
12), or by rubber molding the inner cylinder (11) and intermediate plate (13) together, and forming the outer cylinder (12).
The rubber-like elastic body (14) was press-fitted to give precompression to the rubber-like elastic body (14) to ensure durability. Furthermore, even in the case where a stopper member (15) having an arcuate cross section is provided on the outer circumferential side of the rubber-like elastic body (14), rubber molding is performed on the inner cylinder (11) as shown in FIG. It had a structure in which a stopper member (15) was press-fitted into the outer cylinder (12).

[Problem to be solved by the invention]

FIG. 6 shows the spring characteristics of the structure precompressed as described above, that is, the structure shown in FIG. In order to improve durability, the rubber-like elastic body is pre-compressed, and near the JX point, the characteristics in the P2 direction, where the load acts from the side without the intermediate plate (13) to the side with the plate, become discontinuous.
The disadvantage is that the initial spring characteristics are stiff. In addition, in the case of the structure shown in FIG. 7, in order to press-fit a stopper member (15) into the outer cylinder (12) into the rubber-molded inner cylinder (11), it is necessary to press the stopper member (15) into the outer cylinder (12). One of the parts (15) gets caught, gets chewed up, or creates resistance, so it is difficult to press-fit it easily.

[Means to solve the problem]

As a result of considering the above issues, we created an inner bush (5) with a rubber-like elastic body (4a) on the outer circumference of the inner cylinder (1), and a rubber-like elastic body (4b) on the inner circumference of the outer cylinder (2). Consisting of an outer bush (6) and an intermediate plate (3) with an arcuate cross section, the intermediate plate (3) is placed on the outer bush (6) or the inner bush (5), and the inner bush (5) is attached to the outer bush. They developed an automobile suspension bushing that is press-fitted or partially press-fitted into the bushing (6).

[Effect]

According to the structure of the above solution, as shown in FIG.
A spring characteristic that is asymmetrical with respect to the origin and continuous in the P2 direction can be obtained. That is, the initial spring characteristics are soft. Furthermore, since the structure is such that the inner bushing (5) having the rubber-like elastic body (4a) on the outer periphery is inserted and held into the outer bushing (6) having the rubber-like elastic body (4b) on the inner periphery, Good press-fit performance can be obtained by simply adjusting the fitting allowance.

【Example】

Embodiments will be described in detail below with reference to the drawings. FIG. 1(a) is a cross-sectional view in the direction perpendicular to the axis of the automobile suspension bushing of the present invention, and FIG. 1(b) is a cross-sectional view in the coaxial direction. FIG. 2(a) is a sectional view of the inner bushing in the direction perpendicular to the axis, and FIG. 2(b) is a sectional view of the inner bushing in the axial direction. FIG. 3(a) is a sectional view of the outer bushing in the direction perpendicular to the axis, and FIG. 3(b) is a sectional view of the outer bushing in the axial direction. As is clear from these figures, this automobile suspension bushing has a structure in which the rubber-like elastic body is divided into an inner cylinder (1) side and an outer cylinder (2) side, and in this example, the intermediate plate ( 3) is on the outer cylinder (2) side. In the present invention, a rubber-like elastic body (4a) arranged around the outer circumference of the inner cylinder (1) is referred to as an inner bush (5), and the outer cylinder (2) is referred to as an inner bush (5).
The intermediate plate (3) having a rubber-like elastic body (4b) arranged on its inner periphery is called an outer bush (6), and has an arcuate cross section. (4b) is buried within. This intermediate plate (3) may be placed on the inner bush (5) side. Furthermore, depending on the required characteristics, they can be provided on the symmetrical side, and the plate thicknesses can also be made different as necessary. As shown in Figure 2 (a), the inner bush (5) has a rubber-like elastic body (4a) sandwiching the inner cylinder (1) and has protrusions (7) (7) on both sides. . and,
The rubber-like elastic body (4b) of the outer bush (6) has a protrusion (7) of the rubber-like elastic body (4a) of the inner cylinder (1).
Fitting grooves (8) (8) are provided at positions corresponding to (7). At this time, the outer diameter D of the protrusion (7) is larger than the inner diameter D2 of the fitting groove (8) by the press-fitting allowance, and the rubber-like elastic body (4a) of the inner bush (5) and The other portions of the rubber-like elastic body (4b) of the outer bush (6) have approximately the same diameter. With this structure, the inner bushing (5) is press-fitted or partially press-fitted to the outer bushing (6), so the protrusions (7) (7) of the inner bushing (5) are press-fitted or bonded. The other portions of the rubber-like elastic body (4a) of the inner bushing are fitted in contact with the rubber-like elastic body (4b) of the outer bush (6). Rubber hardness of the rubber-like elastic body (4a) of the inner cylinder (1) or the rubber-like elastic body (4b) of the outer cylinder (2), the intermediate plate (3)
The spring constant of the entire suspension bushing can be freely changed by changing the plate thickness and angle (area) of the suspension bushing, and by using a plurality of intermediate plates (3).

【Effect of the invention】

The automobile suspension bushing of the present invention has the above-described structure, so that it can be easily assembled during manufacturing, and when used in an automobile suspension, it can absorb vibrations at low loads well and It also has excellent vibration absorption properties under excessive loads, and has the effect of improving riding comfort, safety, etc.

[Brief explanation of drawings]

1 to 3 show a suspension push for an automobile according to the present invention, and FIG.
Figure (b) is a coaxial sectional view. FIG. 2(a) is a cross-sectional view of the inner bush in the direction perpendicular to the axis, and FIG. 2(b)
is an axial cross-sectional view of the inner bushing. Figure 3 (a
) is a cross-sectional view of the outer bush in the direction perpendicular to the axis;
Figure (b) is an axial cross-sectional view of the outer bush. FIG. 4 is a graph showing the spring characteristics of the automobile suspension bushing of the present invention. FIG. 5 is a cross-sectional view of the conventional product in the direction perpendicular to the axis, and FIG. 6 is a graph showing the spring characteristics of the conventional product. FIG. 7 is a sectional view showing how another conventional product is assembled. (1) Inner cylinder (2) Outer cylinder (3) Intermediate plate (4a) (4b) Rubber-like elastic body (5) Inner bush (6) Outer bush (7) Projection (8) Fitting groove or above

Claims (1)

[Claims] 1 Inner bushing (5) with rubber-like elastic body (4a) arranged on the outer periphery of inner cylinder (1), outer bush (6) with rubber-like elastic body (4b) arranged on the inner periphery of outer cylinder (2), and cross section It consists of an arc-shaped intermediate plate (3), and the intermediate plate (3) is attached to the outer bush (6) or inner bush (5).
) and an inner bush (5) is press-fitted or partially press-fitted into an outer bush (6).