JPH0224209A - Rear suspension device - Google Patents

Abstract

PURPOSE:To improve the steering performance and suppress the projection of a leaf spring with the central part supported with the vehicular body and both ends supporting both rear wheels from the floor of a vehicular body by arranging the leaf spring on the rear side of the vehicular body from the line connecting both wheels to each other in the vehicular width direction. CONSTITUTION:A rear suspension device 1 is provided with an inverted A shaped suspension member 3 for maintaining a differential case, an A shaped lower arm 4 and V shaped upper link 5 supported thereby in free oscillation. Between an accelerating housing 6 and a vehicular body, there is arranged a shock absorber 7 and a lateral rod 8. In this case, there is arranged a leaf spring 9 in the vehicular width direction, wherein the central part thereof is supported by the vehicular body through the suspension member 3 and the both ends thereof support the rear wheels through the accelerating housing 6. The leaf spring is set to be offset on the rear side of the vehicle from the line connecting both rear wheels 10 to each other by a specific distance l.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a rear suspension device, and more particularly to a rear suspension device equipped with an A-arm and a lateral rod, and a rear suspension device with reduced protrusions on the floor surface. Regarding.

(Prior Art) In recent years, as demands for vehicles have become more sophisticated, rear suspension devices have come to be required to have not only ride comfort but also a high level of handling stability.

As a conventional rear suspension device intended to improve handling stability, there is, for example, the one described in Japanese Patent Application Laid-Open No. 61-263809, which consists of at least one A-arm and one In a rear suspension system that supports a rear wheel by a lateral rod, the amount of toe-in change when braking force is applied to the wheel is determined by the intersection angle in a plan view between the pivot axis of the A-arm relative to the vehicle body and the axis of the lateral rod. This is set near the maximum angle, so that when lateral force or braking force is applied to the rear wheel,
By applying a steering angle in the toe-in direction to the rear wheels, the turning characteristics of the vehicle are changed to oversteer, thereby improving the steering stability.

(Problem to be Solved by the Invention) However, in such conventional rear suspension devices, when lateral force or braking force is applied to the rear wheels, the turning characteristics of the vehicle are oversteered, resulting in poor handling. Although this was an excellent improvement in terms of improvement, the structure was such that the wheels and the vehicle body were connected by a strut tower with coaxial coil springs and shock absorbers, so the upper part of the strut tower protruded significantly toward the floor. This was an obstacle to securing a comfortable interior space. Particularly in the case of a one-box car, it is desirable to have a flat floor, but when using a rear suspension system that achieves the above-mentioned improved handling, there is a problem in that it is difficult to achieve a fully flat floor.

(Object of the Invention) Therefore, an object of the present invention is to provide a rear suspension device having a structure that improves steering stability and suppresses protrusion toward the floor side.

(Means for Solving the Problem) In order to achieve the above object, the rear suspension device according to the present invention supports a rear wheel using at least one A-arm and one lateral rod. The leaf spring is disposed horizontally, and the approximate center of the leaf spring is supported toward the vehicle body, and both ends of the leaf spring support the left and right rear wheels. It is located at the rear of the vehicle body relative to the line connecting the axles.

(Function) In the present invention, a leaf spring arranged substantially in the vehicle width direction is used instead of a coil spring. Therefore, the total length of the strut tower is
Further, the inclination of the axis of the shock absorber is selected to be any inclination necessary for the shock absorber to operate, thereby reducing the floor-side projecting portion of the strut tower.

(Example) Hereinafter, the present invention will be explained based on the drawings.

1 to 4 are views showing one embodiment of the rear suspension device according to the present invention, FIG. 1 is a perspective view of the main parts thereof, and FIG. 2 is a layout diagram of the left rear wheel side viewed from above. , FIG. 3 is a layout diagram of the left rear wheel side viewed from the rear, and FIG. 4 is a layout diagram of the left rear wheel side viewed from the side.

First, the configuration will be explained. In Figures 1 to 4, 1 is a rear suspension device, and the rear suspension device 1 is elastically supported at two points (a) and (b) on the front side of the vehicle body, and elastically supported at one point on the rear side (c). In addition, an inverted A-shaped suspension member 3 that holds the differential case 2
, a substantially A-shaped lower arm (A-arm) 4 and a substantially V-shaped upper link 5 that are swingably supported by the suspension member 3 and allowed to move slightly in the direction of the swing axis; The axle housing 6 attached to the swinging end of the upper link 5 has a predetermined inclination between the axle housing 6 and the vehicle body (not shown) (inclines toward the front of the vehicle body and also toward the inside of the vehicle body). Shock absorber 7 installed in
A lateral rod 8 connects the axle housing 6 and the vehicle body in a direction substantially parallel to the road surface, and a leaf spring (GFRP spring) 9 is disposed substantially in the vehicle width direction. It is supported by the vehicle body near the center via a suspension member 3, and each of its ends is connected to a rear wheel 10 via left and right axle housings 6 (for convenience, only the left rear wheel is shown). is supported. Furthermore, this leaf spring 9 is offset by a distance l toward the rear of the vehicle body from a line connecting the left and right rear wheels (see FIG. 2).

In addition, 11 is a stabilizer, 12 is a brake disc,
13 is a brake caliper, 14.14' is a drive shaft, and 15.15' is a dust boot.

Next, the effect will be explained.

- In S, when the force applied to the rear wheels changes when the vehicle turns or suddenly accelerates or decelerates, if this force changes the steering angle of the rear wheels in the toe-out direction, it is undesirable because steering stability deteriorates. .

When turning, a lateral force acts on the outer turning wheel from the outside of the vehicle body toward the inside, but in this embodiment, the lateral rod 8 is arranged in the direction of this lateral force, and the lower arm 4
Since the upper link 5 is allowed to move slightly in the direction of its swing axis, the lower arm 4 and the upper link 5 move due to lateral force, and as a result, the rear wheel 10 changes its steering angle toward the toe-in side. let That is, the turning characteristics change to understeer, thereby improving steering stability.

22" I6i Ryo When a force in the longitudinal direction is applied to the rear wheel due to braking torque or driving torque, in this embodiment, the suspension member 3 moves toward the rear of the vehicle body by the amount of compliance, and,
The lower arm 4 and the upper link 5 move slightly in the direction of their swing axes to give the rear wheels a steering angle in the toe-in direction. This improves steering stability during sudden acceleration.

On the other hand, since the leaf spring 9 is used instead of the conventional coil spring, a portion of the strut tower (part of the strut tower does not exist in this example, but for convenience) The overall length of the shock absorber 7 can be reduced. Furthermore, since the inclination angle of the shock absorber 7 can be freely tilted within a range that ensures smooth operation of the shock absorber 7, in combination with the shortening of the overall length mentioned above, protrusion toward the floor side can be suppressed as much as possible. ,
For example, it is possible to realize a rear suspension device having a structure suitable for a one-box car that is desired to be completely flat.

Further, in this embodiment, the axle housing 6 main body is provided with a contact surface on the wheel side that comes into pressure contact with a bump rubber attached to the vehicle body when bumping.

That is, in FIG. 4, the bump rubber (A) is attached to the vehicle body at a position in the direction of the movement line X of the axle housing 6 accompanying the bump movement of the rear wheel 10, and the bump rubber (A) is attached to the axle housing 6. ) is integrally formed. By doing this, the unsprung load can be reduced compared to the case where the contact surface (B) is provided separately, and costs can be reduced because no additional parts are required for the contact surface.

(Effects of the Invention) According to the present invention, while improving maneuverability, the floor
A rear suspension device having a structure that suppresses sideward protrusion can be realized. Thereby, for example, it is possible to both improve the steering stability and achieve full flatness in a one-box car.

[Brief explanation of the drawing]

1 to 4 are diagrams showing an embodiment of the rear suspension device according to the present invention. FIG. 1 is a perspective view of the main parts thereof, and FIG. 2 is a layout diagram of the vicinity of the left rear wheel seen from above. , FIG. 3 is a layout diagram of the vicinity of the left rear wheel viewed from the rear, and FIG. 4 is a layout diagram of the vicinity of the left rear wheel viewed from the side. 4...Lower arm (A arm), 8...
・Lateral rod, 9... Leaf spring, 10... Rear wheel.

Claims (1)

[Claims] In a rear suspension device that supports a rear wheel with at least one A-arm and one lateral rod,
A leaf spring is provided which is placed horizontally in the width direction of the vehicle, and the vicinity of the center of the leaf spring is supported by the vehicle body, and both ends of the leaf spring support the left and right rear wheels. , a rear suspension device characterized by being located on the rear side of the vehicle body from the line connecting the left and right rear wheels.