JPH07167208A - Bush device - Google Patents

Abstract

PURPOSE:To provide a bush device not requiring a bush coming out stopper by which its assembly to a suspension member may be carried out easily. CONSTITUTION:A bush device is mainly composed of inner/outer cylinders 11, 12 having their shafts extended toward upper/lower direction and nearly coaxially and a bush main body 13 consisting of a rubber elastic body interposed between both cylinders 11, 12. The outer periphery surface of the inner cylinder 11 is projected to the outer cylinder 12 side and forms a slant surface 11a. A recessed part 14 is formed in the outer cylinder 12 by sinking so as to project toward the inner cylinder 11 and a through hole 15 is opened on the recessed part 14. Resin 16 is fixed through this through hole 15 so as to sandwitch the wall part of the outer cylinder 12. The surface 16, facing to the inner cylinder 11, of the resin 16 forms the slant surface on the outer cylinder 12 side so as to be in parallel with the slant surface 11a of the inner cylinder 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle suspension provided with a suspension member, and more particularly to a bush device used for elastically supporting the suspension member on a vehicle body.

[0002]

2. Description of the Related Art A vehicle suspension including a suspension member includes, for example, left and right wheel support members that rotatably support left and right wheels, and a suspension member elastically supported by a vehicle body through a plurality of bush devices. A suspension arm that extends substantially in the vehicle width direction and connects the suspension member and the wheel support member, and a suspension arm that is arranged with its axis oriented substantially vertically and has an upper end pivotally attached to the vehicle body or suspension member and a lower end And a vertical force transmission member composed of a shock absorber or the like pivotally attached to the support member.

The bush device has an inner cylinder and an outer cylinder which extend in the vertical direction and are arranged substantially coaxially.
And a rubber-like elastic body which is interposed between the two cylinders and constitutes a bushing main body. At this time, when a lateral force acts on the wheels from the road surface during turning of the vehicle, the lateral force is input to the suspension member via the suspension arm, which causes roll displacement of the suspension member. The device cannot effectively reduce the roll displacement, and it has been difficult to ensure good steering stability of the vehicle.

Therefore, in the prior art, Japanese Patent Laid-Open No. 28740/1990 is used.
A bushing device as described in Japanese Patent No. 5 is used to reduce the roll swing of the suspension member relative to the vehicle body. In this bush device, the inner cylinder and the bush body are vertically divided into two parts, and the outer peripheral surface of the upper inner cylinder facing inward in the vehicle width direction is inclined inward and downward in the vehicle width direction. An inclined surface is formed such that an outer peripheral surface of the lower inner cylinder facing outward in the vehicle width direction is inclined outward in the vehicle width direction and upward. further,
By forming the outer cylinder inner peripheral surface shape to be parallel to the inner cylinder outer peripheral surface shape, an inclined surface is also formed on the outer cylinder side.

Since the inner cylinder and the outer cylinder have an oval shape (oval shape) in the above structure, the bush main body also has an oval cross section.

[0006]

However, in the above-mentioned conventional bush device, even if the bush main body having an elliptical cross section is press-fitted between the upper and lower cylinders, a sufficient pull-out load cannot be secured, so the slip-out prevention device. Need to be installed separately. If the retaining device is not provided, the bush main body may come out of the both cylinders while the suspension is being used, that is, while the vehicle is running, and a problem such as abnormal noise may occur. It should be noted that by tightening the bush main body from above and below with the upper inner cylinder and the outer inner cylinder, even if the outer cylinder is attached by utilizing the reaction force of the bush main body, play still occurs.

Further, in the above-mentioned bush device, it is necessary to assemble the bush body and the inner cylinder from above and below the suspension member, which is troublesome. The present invention has been made in view of the above problems, and an object of the present invention is to provide a bush device that can be easily assembled to a suspension member and that does not require a bush slip-off preventing device.

[0008]

In order to achieve the above object, a bushing device of the present invention has an inner cylinder extending substantially vertically and fixed to one of a vehicle body and a suspension member, and an inner cylinder. The outer cylinder is disposed substantially coaxially and is fixed to the other of the vehicle body or the suspension member, and the rubber-like elastic body is interposed between the inner cylinder and the outer cylinder. In a bush device having an inclined surface inclined in the vehicle width direction on one or both of the inner peripheral surfaces,
A recess provided in the peripheral portion of the outer cylinder so as to project toward the inner cylinder, a through hole that penetrates the outer cylinder wall portion at a position inside the recess, and a state in which the through hole is connected through the through hole, Resin that is fixed to the inside of the recess and the inner peripheral surface of the outer cylinder and that has a surface facing the outer peripheral surface of the inner cylinder that forms an inclined surface on the outer cylinder side.

[0009]

The resin is fixed to the inside of the recess and the inner peripheral surface of the outer cylinder in a connected state through the through hole, so that the resin sandwiches the inner and outer surfaces of the outer cylinder wall through the through hole. Can be installed with. This resin is in a state of protruding from the inner peripheral surface of the outer cylinder toward the outer surface of the inner cylinder, and prevents the bush main body interposed between the both cylinders from moving in the slip-out direction (axial direction).

At this time, the resin acts as an external force (reaction force) from the bush body in the axial direction, that is, an external force for peeling the resin from the inner peripheral surface of the outer cylinder. Since it is fixed so as to be sandwiched, the resin is prevented from peeling off from the outer cylinder. If the resin is simply fixed to the inner surface of the outer cylinder, the fixing strength is weak and the resin may peel off.

Further, on the outer peripheral side of the outer cylinder, since the resin is fixed in the concave portion, the resin is prevented from protruding outward.

[0012]

Embodiments of the present invention will be described with reference to the drawings.
First, the structure will be described. As shown in FIG. 3, the left and right wheels 1 are respectively supported by the wheel support members 2. The upper and lower portions of each wheel support member 2 are connected to one end of an upper arm 3 and a lower arm 4, which are suspension arms, respectively. The left and right lower arms 4 and upper arms 3 extend in the vehicle width direction, and the other ends thereof are connected to the suspension member 5.

A lower end portion of a shock absorber 6 is pivotally attached to each of the wheel supporting members 2. Each of the shock absorbers 6 extends upward, and the upper end portion thereof is pivotally attached to the vehicle body 7. A spring 8 is mounted between the vehicle body 7 and the wheel support member 2 along the extending direction of the shock absorber 6, and together with the shock absorber 6, a vertical force transmission member 9 is formed.

The suspension member 5 is elastically supported by the vehicle body 7 via four bush devices 10 which are spaced from each other in the vehicle front-rear direction and the vehicle width direction. As shown in FIG. 1, the bush device 10 includes an inner cylinder 11 and an outer cylinder 12 that extend substantially coaxially and have their axes oriented in the vertical direction.
The bush main body 13 made of a rubber elastic body interposed between the two cylinders 11 and 12 is a main constituent element.

The inner cylinder 11 is provided with a slanted surface 1 by projecting toward the outer cylinder 12 at a position facing the intermediate portion in the vertical direction and in the vehicle width direction.
1a is formed. The inclined surface 11a is set such that the inside in the vehicle width direction faces inward and downward in the vehicle width direction, and the outside in the vehicle width direction faces outward and upward in the vehicle width direction. In addition, the outer cylinder 12 is recessed at a position facing the inclined surface 11 a in the radial direction so as to project toward the inner cylinder 11, and each of the recesses 14 is formed.
Through holes 15 are opened at the bottom of each.

Further, through the through hole 15, the outer cylinder 12
The resin 16 is fixed to the inner peripheral surface side, and the resin 16 is also fixed to the inside of the recess 14 so that the inner and outer surfaces of the outer cylinder 12 are sandwiched via the through holes 15. Surface 1 of resin 16 fixed to the inner peripheral surface side of outer cylinder 12 and inner cylinder 11
Reference numeral 6a denotes an opposing surface, that is, the inclined surface 1 of the inner cylinder 11.
An inclined surface 16a on the outer cylinder 12 side that is parallel to 1a is formed.

The fixing of the resin 16 is carried out, for example, by forming a notch on the outer peripheral surface of the bush body 13 in accordance with the shape of the resin 16 to be formed in advance.
After press-fitting between the two cylinders 11 and 12, the resin 16 is poured through the through hole 15 and solidified to fix the resin. At this time, the resin 16 naturally flows into the recess 14 and adheres thereto. Since the concave portion 14 is dented, a jig for preventing the poured resin 16 from flowing out of the concave portion 14 is unnecessary, and since it does not protrude from the outer peripheral surface of the outer cylinder 12 even after solidified, Outer cylinder 12 for resin 16
There is no need to finish the outer peripheral surface.

Then, each bushing device 10 having the above construction
A bolt 20 is inserted through the inner cylinder 11, and the inner cylinder 11 side is fixed to the bracket 21 attached to the vehicle body 7 side via the bolt 20. Further, the outer cylinder 12 side is fixed to the suspension member 5 by being fitted into the cylindrical body 22 provided on the suspension member 5.

As a result, the suspension member 5
Is elastically supported by the vehicle body 7 via the bush device 10,
The bush body 10 absorbs swinging of the suspension member 5 with respect to the vehicle body 7 in a substantially vertical direction. That is,
The vertical swing between the cylinders 11 and 12 of the bush device 10 is absorbed by the elastic force of the bush body 13. At this time, the bush main body 13 is
Although it tries to move in the axial direction (removal direction) between the two cylinders 11 and 12 by bending, the resin 16 prevents the movement and the bush main body 13 does not come out from between the two cylinders 11 and 12. Unlike the conventional case, it is not necessary to attach the bush retaining device separately.

In the suspension having the above structure, when a lateral force acts on the wheel 1 from the road surface during turning or the like, this lateral force is input to the vehicle body 7 via the vertical force transmission member 9 and at the same time, the upper arm. It is also input to the suspension member 5 via the lower arm 4 and the lower arm 4. At this time, for example, when a lateral force that acts inward in the vehicle width direction acts on the wheel 1, a force that acts outward in the vehicle width direction and upward acts on the suspension member 5, and conversely, acts on the wheel 1 outside in the vehicle width direction. When a lateral force directed inward is applied, a force directed inward and downward in the vehicle width direction is applied to the suspension member 5, whereby the suspension member 5 tends to swing in the roll direction with respect to the vehicle body 7.

However, when the suspension member 5 is elastically supported by the bush device 10 having the above-described structure, the inner cylinder 11 and the outer cylinder 12 are relatively displaced laterally due to the lateral component of the force acting on the suspension member 5. Then, the bush main body 13 portion between the opposed inclined surfaces 11 a and 16 a is compressed, and the spring constant of the bush device 10 in the vertical direction increases, and the relative displacement in the vertical direction between both cylinders 11 and 12 is increased. Is suppressed.

At the same time, the inclined surfaces 11a and 16a are formed on the bush body 13 between the inclined surfaces 11a and 16a between the two cylinders.
Since a reaction force is generated in a direction perpendicular to the direction, and this reaction force acts in a direction to cancel the force acting on the suspension member 5, the relative swing of the suspension member 5 with respect to the vehicle body 7 in the roll direction is reduced. As a result, good steering stability is ensured when the vehicle turns.

The inclination angle of each of the inclined surfaces 11a and 16a is optimally set according to the layout of the suspension structure used. Further, in the above embodiment, the inclined surface 11a is provided on the inner cylinder 11 side, but the inclined surface 11a may not be formed on the inner cylinder side 11.

[0024]

As described above, by using the bush device of the present invention, the roll swing of the suspension member at the time of turning can be reduced, and the device for preventing the bush from coming off is unnecessary. It also has the effect of facilitating assembly.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view (cross-sectional view taken along the line AA in FIG. 2) showing a bush device according to an embodiment of the present invention.

FIG. 2 is a top view showing a bush device of an embodiment according to the present invention.

FIG. 3 is a schematic configuration diagram showing a configuration of a suspension according to an embodiment of the present invention.

[Explanation of symbols]

 5 Suspension Member 7 Vehicle Body 10 Bushing Device 11 Inner Cylinder 11a Sloping Surface 12 Outer Cylinder 13 Bushing Body 14 Recess 15 Through Hole 16 Resin 16a Sloping Surface

Claims (1)

[Claims] 1. An inner cylinder extending substantially vertically and fixed to one of a vehicle body and a suspension member, and an outer cylinder arranged substantially coaxially with the inner cylinder and fixed to the other of the vehicle body and the suspension member. A rubber-like elastic body interposed between the inner cylinder and the outer cylinder, and an inclination inclined in the vehicle width direction on one or both of the outer peripheral surface of the inner cylinder and the inner peripheral surface of the outer cylinder. In a bushing device having a surface, a recessed portion provided in the peripheral portion of the outer cylinder so as to project toward the inner cylinder, a through hole penetrating the outer cylinder wall portion at a position inside the recess, and the through hole are A resin that is fixed to the inside of the concave portion and the inner peripheral surface of the outer cylinder in a state of being connected via the resin, and that has a surface facing the outer peripheral surface of the inner cylinder forming an inclined surface on the outer cylinder side. Bush device.