JPS6211684Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a suspension support structure. Traditionally, it was the first suspension for automobiles.
As shown in the figure, a trailing arm 4 to which wheels 2 are attached is rotatably supported by a support shaft 6,
It is known that both ends of the support shaft 6 are supported by the vehicle body 10 via rubber bushes 8.

However, in this type of suspension, when a lateral force F acts on the wheel 2 during high-speed turning, etc., a rotational moment in the horizontal plane acts on the support shaft 6 due to the offset between the support shaft 6 and the grounding point of the wheel 2. , the rubber bushing 8 was bent and the wheel 2 was displaced as shown by the broken line in the figure, resulting in a noticeable so-called oversteer characteristic and a problem of worsening steering stability.

The present invention was devised in view of the above, and includes a bushing structure interposed between the outer peripheral surface of both ends of the support shaft that rotatably supports the trailing arm and the inner peripheral surface of the vehicle body side bracket. , the bushing structure is comprised of two conical rubber bushes having an axis equal to the axis of the support shaft, arranged so that their tops face each other, and the inner circumferential surface of the bracket is aligned with the outer circumference of the rubber bushing. The support structure is formed along a surface, and each of the rubber bushes has a cone inside thereof whose inner and outer circumferential surfaces are substantially parallel to the inner and outer circumferential surfaces of the rubber bush and whose rigidity is sufficiently higher than that of the rubber bush. The rubber bushing is inserted so as to be entirely surrounded by the same rubber bushing, and the rubber bushing on the outside in the width direction of the vehicle body has a space on its outer peripheral surface located at the front of the vehicle body, and the rubber bushing on the inside in the width direction of the vehicle body has a space on its outer peripheral surface. The gist of this paper is a suspension support structure that is characterized by having empty spaces in the rear portions of the vehicle body.

According to the present invention, when a relative force is applied in the vehicle width direction between the support shaft and the vehicle body side bracket,
Since the part of each of the rubber bushings on the side having the void is more easily deformed than the part on the opposite side, the side opposite to the part of the outer peripheral surface of the cone corresponding to the void in the bushing The cone and the bracket generate relative sliding displacement along the portion of the support shaft, thereby generating a force that displaces both ends of the support shaft toward the front or rear of the vehicle body, respectively. Therefore, the rotational moment in the horizontal plane that acts on the support shaft 6 during turning can be canceled out by the force that acts on the shaft based on the sliding displacement, thereby improving the steering of the entire rear wheel suspension. As for the characteristics, it is possible to obtain neutral steering characteristics or weak understeer characteristics that are easy to maneuver. In addition, since the inclined surface with respect to the support shaft necessary to generate the above-mentioned sliding displacement is formed by the outer peripheral surface of the truncated cone-shaped cone inserted into the rubber bushing, the inner peripheral surface of the bushing is made straight. The support shaft can be formed into a cylindrical shape, so that the portion of the support shaft that is fitted into the bush can be formed into a straight columnar shape, which has the effect of facilitating manufacture.

Furthermore, since the cone is inserted inside the bushing so as to be completely surrounded, the adhesive area between the same cone and the rubber bushing is increased.
This has the effect of greatly improving adhesive strength.

Hereinafter, one embodiment of the present invention will be described in detail with reference to FIGS. 2 to 4. FIG. 2 shows the left end of the support shaft 6, where 6a is the small diameter part of the support shaft 6, and 10 is the small diameter part of the support shaft 6.
a is a bracket fixed to the vehicle body 10; 12 and 14 are two rubber bushes interposed between the small diameter portion 6a and the bracket 10a; 16 is screwed onto the small diameter portion 6a; It is the nut that keeps it from falling out. The rubber bushing 12 has a truncated conical shape with an axis equal to the axis of the small diameter portion 6a, and has inner and outer circumferential surfaces that are approximately parallel to the inner and outer circumferential surfaces of the bushing 12, and is made of resin that is sufficiently more rigid than that of the bushing. Alternatively, a metal cone 20 is inserted to surround the entire structure. The rubber bush 12 is manufactured by injecting rubber into a mold while supporting the cone 20 from both ends in the axial direction with a total of eight pins (not shown). This is a hole created by removing it. Also,
A space 22 is formed in a portion of the outer periphery of the rubber bushing 12 located toward the front of the vehicle body.
The rubber bushing 14 has the same structure as the rubber bushing 12, but a cavity 22 is formed in the outer periphery of the rubber bushing 14 at a portion located toward the rear of the vehicle body. Furthermore, a bracket 1 is attached to the large diameter end of the rubber bush 12.
A flange 24 is provided that abuts against the end of Oa to prevent dust from entering into the space 22.

The structure described so far relates to the left end of the support shaft 6, but the right end of the support shaft 6, although not shown, has a similar structure, and the rubber bushes 12 and 14 include the longitudinal centerline of the vehicle body. They are arranged symmetrically with respect to the vertical plane. When an external force F acts on the support shaft 6 via the wheel 2, the inner peripheral surface of the bracket 10a, the outer peripheral surface of the cone 20 in the bushes 12, 14, and the space 22 of the bushes 12, 14 cooperate with each other. This action generates a force that displaces the left end of the support shaft 6 toward the front of the vehicle and the right end of the support shaft 6 toward the rear of the vehicle.

According to the above configuration, when an external force F acts on the support shaft 6 via the wheel 2 during a right turn, for example, the support shaft 6
A force is generated that displaces the left end of the wheel to the front of the vehicle and the right end of the wheel to the rear of the vehicle.In other words, the rear wheel suspension as a whole moves in the opposite direction to the behavior of the conventional device described in Figure 1 (dashed line in the figure). Therefore, it is possible to obtain neutral steering characteristics or weak understeer characteristics that are easy to maneuver.

Furthermore, in this embodiment, since the cone 20 inserted into the rubber bushing 12 is provided with an inclined surface corresponding to the inner circumferential surface of the bracket 10a, the inner circumferential surface of the bushing 12 can be formed into a straight cylindrical shape. Since the small diameter portion 6a of the support shaft 6 can be made into a straight cylindrical shape, it is advantageous in that manufacturing is easy.

Furthermore, since the cone 20 is inserted into the bush 12 so as to be completely surrounded by it, the adhesive area between the cone 20 and the rubber is increased, and the adhesive strength is greatly improved.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the entire conventional suspension, Fig. 2 is a sectional view showing an embodiment of the present invention, Fig. 3 is a sectional view of the rubber bushing 12 shown in Fig. It is a left side view of the rubber bushing 12 of a figure. 2...Wheel, 4...Trailing arm, 6...
... Support shaft, 10 ... Vehicle body, 10a ... Bracket, 12, 14 ... Rubber bushing, 20 ... Cone, 22 ... Blank space.

Claims (1)

[Scope of utility model registration request] A bushing structure is provided between the outer circumferential surface of both ends of a support shaft that rotatably supports the trailing arm and the inner circumferential surface of the vehicle body side bracket, and the bushing structure is arranged so that the axis of the support shaft is Two cone-shaped rubber bushes having an axis equal to , are arranged so that their tops face each other,
The support structure is formed such that the inner circumferential surface of the bracket is formed along the outer circumferential surface of the rubber bushing, and each of the rubber bushings has an inner and outer circumferential surface substantially parallel to the inner and outer circumferential surfaces of the rubber bushing. In addition, a cone that is sufficiently more rigid than the rubber bushing is inserted so as to be entirely surrounded by the rubber bushing, and the rubber bushing on the outside in the width direction of the vehicle body has an empty space on its outer peripheral surface located at the front of the vehicle body. A support structure for a suspension, wherein the rubber bushings located on the inner side in the width direction each have a void space in a portion of the outer circumferential surface of the rubber bushing located at the rear of the vehicle body.