JPS58209606A - Rear suspension for car - Google Patents

Abstract

PURPOSE:To enable a toe-in change of a rear wheel by making use of a strut to cushion the rise and fall of the rear wheel when bumping for constructing to rotate a front lateral link greater than a rear one. CONSTITUTION:In a rear suspension, the front and the rear part of a wheel support member 1 to support a rear wheel 2 to be rotatable are respectively supported on a car body 7 via two lateral links 3 and 4, front and rear, extended in parallel to each other. The forward/backward oscillation of the rear wheel 2 is regulated by a trailing link 14, while the rise and fall of the rear wheel 2 is cushioned by a strut 17. At this stage, the front lateral link 3 is arranged a little higher than the rear lateral link 4. An angle alpha between an axial line l1 connecting between connecting parts of the trailing link 14 to the car body 7 and the wheel support member 1 and an axial line l2 connecting between connecting parts of the strut 17 to the car body 7 and the wheel support member 1 is set to be above 90 deg..

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rear suspension installed in an automobile.

In general, in the rear suspension of a car, when the rear wheels bump, such as when driving on rough roads or when turning, in order to improve driving stability, it is necessary to move the rear wheels inward with respect to the driving direction. It is known that it is desirable to vary the toe-in.

The applicant first proposed a rear suspension that changes the toe-in of the rear wheels.

A wheel support member that rotatably supports a rear wheel, two lateral links that connect the front and rear parts of the wheel support member to the inside of the vehicle body and are swingable in the vertical and longitudinal directions, and the wheel support member and the lateral It is equipped with a radius link that elastically connects the assembly consisting of the link to the vehicle body so that it can be slightly displaced in the longitudinal direction of the vehicle body.

By setting the distance between the connection part of the side lateral link with the wheel support member to be smaller than the distance between the connection part with the vehicle body, when a backward load acts on the ground contact part of the rear wheel,
By moving the wheel support member rearward, the front part of the wheel support member is displaced more inward in the vehicle body than the rear part in plan view, thereby changing the toe-in of the rear wheel (Japanese Patent Application Laid-Open No. 54-153422)).

However, in the above proposal, in order to change the toe-in of the rear wheels, it is necessary for a rearward load to act on the ground contact area of the rear wheels, but when the car is actually running, this load does not act. Despite this, the rear wheels may bump.

In this case, there was a problem in that the toe-in change of the rear wheels was not observed, and as a result, the running became unstable.

The present invention has been made in view of the above, and utilizes a strut to buffer the rise and fall of the rear wheel, regardless of whether or not a backward load is applied to the ground contact portion of the rear wheel when the rear wheel bumps. By making the front lateral link thicker (and more forward) than the rear lateral link, the front part of the wheel support member is displaced inward from the vehicle body compared to the rear part, and the rear wheel is The purpose of this is to make it possible to change the toe-in.

Therefore, in the configuration of the present invention, the base end portions are rotatably attached to the vehicle body via elastic bushings, and the distal end portions are rotatably attached to the wheel support member that supports the rear wheels via elastic bushings. Two front and rear lateral links extending in the left and right direction of the connected vehicle body; a trailing link whose front end is rotatably connected to the vehicle body and the rear end to the wheel support member; the upper end is attached to the vehicle body, and the lower end is connected to the vehicle body. a strut which connects a portion of the trailing link to the wheel support member), and an axis connecting the connection portion of the trailing link with the vehicle body and the wheel support member when viewed from the left and right direction of the vehicle body, and an axis between the strut and the vehicle body and the wheel support member. The angle formed with the axis connecting the connecting parts is set to 90° or more, and the strut is configured to rotate the front lateral link more than the rear lateral link when the rear wheel bumps.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in detail below based on embodiments shown in the drawings.

1 to 5 show a rear suspension according to the present invention, where 1 is a wheel support member that rotatably supports a rear wheel 2, and 3 and 4 are two front and rear lateral links extending parallel to the left and right direction of the vehicle body. There it is.

The lengths of both lateral links 6.4 are approximately equal, and the front lateral link 3 is located slightly higher than the rear lateral link 4. As shown in FIG. 4, the base ends of each of the lateral links 6.4 are connected to brackets 8 provided on the vehicle body 7 via elastic bushings 5 and 6 fixed to the base ends via support shafts 9. It is rotatably attached to the vehicle body 7 by being pivotally supported, and each elastic bushing 5. The axis of B is arranged so as to be slightly inclined upward toward the front. On the other hand, as shown in FIG. 5, the tip of each of the lateral links 3, 4 is in a state where the wheel support member 1 is slightly inclined upwardly toward the front, that is, approximately aligned with the axis of the elastic bushing 5, B. It is rotatably connected to the wheel support member 1 via elastic bushings 12 and 13 that are fitted and fixed to the front and rear protrusions of the support shaft 10 that extend in parallel in the ffr& direction.

14 is a trailing ring i extending in the longitudinal direction of the vehicle body.
The trailing link 14 is.

Its front end is connected to the vehicle body 7, and its rear end is connected to the lower part of the wheel support member 1 via elastic bushings 15 and 16, respectively, so as to be freely rotatable with respect to a vertical plane in the longitudinal direction of the vehicle body,
It is configured to restrict back and forth rocking of the rear wheel 2 supported by the wheel support member 1.

Furthermore, the strut 17I-i is a strut for cushioning the elevation of the rear wheel 2, and the strut 17 has its upper end rubber-mounted to the vehicle body 7 with a slight upward rearward inclination, while its lower end is rubber-mounted to the vehicle body 7. It is integrally connected to the upper part of the wheel support member 1.

Each of the lateral links 3 and 4 is provided so as to be inclined downwardly and outwardly so that the distal end side thereof is located lower than the base end side in the standard state of the vehicle (the state where the vehicle is stopped with the maximum number of occupants). , the trailing link 14 is provided so as to be inclined rearward and downward. Also, an axis 11 connecting the connecting portion of the trailing link 14 with the vehicle body 7 and the wheel support member 1 when viewed from the left and right direction of the vehicle body (in the case of a linear trailing link 14, the axis center line of the trailing link 14) The angle α between the strut 17 and the axis 12 connecting the connecting portion of the vehicle body 7 and the wheel support member 1 is set to be 90° or more, so that when the rear wheel 2 bumps, the strut 17, the front lateral link 3 is configured to rotate more than the rear lateral link 4.

Next, the operation of the above embodiment will be explained.

When the rear wheel 2 bumps, the trailing link 14 connects to the vehicle body 7 (the elastic bush 1
5), the wheel support member 1 connected to the rear end of the trailing link 14 rotates around the rotation center of the trailing link 14, and each lateral link 6.4, the elastic bushings 5 and 6 at the proximal end are twisted and rotated about the elastic bushings 5.6 as the center of rotation. Further, the strut 17 connected to the wheel support member 1 is connected to the wheel support member 1.
The lower end of the strut 17 is compressed by an external force (bump load) acting through the strut 17, and the lower end of the strut 17 is displaced upward as the wheel support member 1 rotates.

At this time, the axis 11 (hereinafter referred to as "temporary axis of the trailing link 14") connecting the connecting portion of the trailing link 14 with the vehicle body 7 and the wheel support member 1 when viewed from the left and right direction of the vehicle body, and the strut 17 An axis (hereinafter referred to as "strut 17") connecting the connection part between the vehicle body 7 and the wheel support member 1
Since the angle α formed with the strut 12 (hereinafter referred to as the "imaginary axis line") is set to 90 degrees or more in the standard state, the lower end angle α of the strut 17 increases, and the rearward inclination of the strut 17 increases. Become. Therefore, the front part of the wheel support member 1 connected to the strut 17 is also displaced upward from the rear part,
As a result, the front lateral ring 6 is moved upward more than the rear lateral link 4, so that the front part of the wheel support member 1 is moved 8 degrees inward from the rear part of the vehicle body, as shown in FIG.
The rear wheels 2 are displaced so that a dimensional displacement difference occurs, and the rear wheels 2 can be changed toe-in so as to face inward of the vehicle body with respect to the traveling direction.

In the above embodiment, two front and rear lateral links 6.4 extending in the left-right direction of the vehicle body are arranged in parallel, and the distance between the connecting portions of the two lateral links 3, 4 with the vehicle body 7 and the wheel support member 1 are However, in the present invention, the distance between the connecting portions of both lateral links 6.4 to the vehicle body 7 is set to be greater than the distance between the connecting portions to the wheel support member 1, or Of course, it may be made smaller.

As explained above, according to the present invention, when the rear wheel bumps, the front lateral link of the wheel support member is rotated by the strut to a greater extent than the rear lateral link. The rear wheel is also displaced inward from the vehicle body when viewed from above, allowing for reliable toe-in changes to the rear wheels.

This makes it possible to improve running stability.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and Fig. 1 is a plan view showing the overall structure of the rear suspension, Fig. 2 is a rear view of the same, Fig. 3 is a side view of the same, and Fig. 4 is a lateral link and a vehicle body. FIG. 1 is a partially cutaway plan view showing the connection between the lateral link and the wheel support member;
FIG. 6 is a schematic side view for explaining the operation of the rear wheel when bumping, and FIG. 7 is a schematic rear view of the same. 1. Wheel support member, 2. Rear wheel, 6, 4. Lateral link, 5, 6, '1'2, 13... Elastic bushing. 7. Vehicle body, 14. Trailing link, 17. Strut.

Claims (1)

[Scope of Claims] fi+ Each proximal end is rotatably attached to the vehicle body via an elastic bushing, and the tip end is freely connected via an elastic bushing to a wheel support member that supports the rear wheel. two lateral links, front and rear, extending in the left-right direction of the vehicle body, a trailing link whose @ end is removably connected to the vehicle body and its rear end to the wheel support member described in 1-, and whose upper end is attached to the vehicle body. . Consisting of a strut whose lower end is connected to the wheel support member, the axis connecting the connecting portion of the trailing link with the vehicle body and the wheel support member when viewed from the left and right direction of the vehicle body, and the connection of the strut with the vehicle body and the wheel support member. The angle formed with the axis connecting the parts is set to 90 degrees or more, and the front lateral link is configured to rotate more than the rear lateral link by the strut when the rear wheel bumps. Rear suspension for automobiles.