JPS6229406A - Rear suspension device for automobile - Google Patents

Abstract

PURPOSE:To obtain sufficient change in toe-in when a vehicle makes a turn so as to improve the cornering performance by configurating a device in such a way that a pair of a right and a left trailing arm which are extended longitudinally, are provided while they are swung up and down, and each of those arms is made of a material in a plate form which can be deformed laterally when it is subjected to a lateral force. CONSTITUTION:A pair of trailing arms 1 and 1 which are provided at a right and a left side of a vehicle while they are extended to the longitudinal direction, are pivoted on a body 3 at their front ends by way of brackets 2 while they are swung up and down. And each arm 1 is given high stiffness longitudinally and vertically, and is made of a material in a plate form, the stiffness value in the lateral direction of which is set to allow the plate to be deformed when the plate is subjected to a lateral force. A support 4 is installed on the rear end of each of the trailing arms 1 to support a rear wheel 5 rotatably, and a torsion beam 6 as a cross member is connected between extensions 4b and 4b of those supports 4. And the other end of a lateral rod 8 which is connected with one end of the above said beam 6 by way of a bracket 7, is supported by the body 3 by way of a bracket 9.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a rear suspension system for an automobile, such as one used as a rear wheel suspension system for, for example, a lightweight automobile.

(Prior art) Conventionally, when an automobile turns in the direction of the arrow in Fig. 4, a lateral load, so-called lateral force, acts on the rear wheels 41.41, and the above-mentioned rear wheels 41.41 are represented by imaginary lines in the figure. As shown, there is a problem in that the toe-out occurs, resulting in poor turning performance and an unstable state where the vehicle is prone to spin.

Conventionally, in order to solve such problems, there is a rear wheel suspension system described in, for example, Japanese Utility Model Application Publication No. 58-93507.

In other words, a cross beam is stretched between the rear ends of a pair of suspension arms extending in the front-rear direction at the left and right positions of the vehicle, and crank-shaped intermediate portions of the cross beam are connected forward from both left and right ends of the cross beam. , the rear wheel is mounted on a shaft at the tip of each of these intermediate parts, and the length of the arm of the above-mentioned crank-shaped intermediate part is used to obtain flexural deformation in response to a lateral force, thereby obtaining a toe-in (tOe-in) change. This is a device formed in the following manner.

However, since loads are applied to the above-mentioned middle part in the vertical and front-back directions, the middle part is required to have rigidity. Therefore, there is a limit to the length of the arm due to the rigidity and other factors in the shape and dimensions of the crank-shaped intermediate portion, and there is a problem in that a sufficient toe-in change cannot be achieved.

(Objective of the Invention) This invention not only has sufficient rigidity against loads in the vertical and longitudinal directions and has no toe change, but also has the ability to obtain sufficient toe-in change due to lateral force when the vehicle turns. The purpose of the present invention is to provide a rear suspension device for an automobile that can improve turning performance.

(Structure of the Invention) The present invention includes a pair of trailing arms extending in the longitudinal direction at the left and right positions of a vehicle, having a front end pivotally connected to the vehicle body and a rear end movable up and down; Connect the rear end of the trailing arm to the front part,
a pair of wheel supports that rotatably support the wheels; a cross member connected between extensions extending rearward from the wheel bearings of the wheel supports; one end supported on the vehicle body and the other end connected to the wheel support or The pair of trailing arms are plate-shaped and have high rigidity in the vertical and longitudinal directions, and the rigidity in the horizontal direction is set to a value that allows displacement in response to a predetermined load. The present invention is characterized by being an automobile rear suspension device composed of a body.

(Effects of the Invention) According to the present invention, since the above-mentioned trailing arm and wheel support have high rigidity in the vertical and longitudinal directions, there is no equivalent toe change with respect to loads in the vertical and longitudinal directions.

Moreover, while having the above-mentioned predetermined rigidity, the wheel support located between the extension part and the rear end of the trailing arm bends inward due to the lateral force (lateral load) when turning. Since it is displaced following the trailing arm, it is possible to obtain a sufficient toe-in change, which has the effect of improving turning performance.

(Example) An embodiment of the present invention will be described in detail below based on the drawings.

The drawings show a rear suspension device for an automobile, and in FIGS. 1, 2, and 3, a pair of trailing arms 1, 1 extending in the front-rear direction at the left and right positions of the vehicle are:
Its front end is pivotally connected to the vehicle body 3 via a trailing arm bracket 2.2, and its rear end is configured to be swingable in the vertical direction.

In addition, the above-mentioned pair of trailing arms 1.1 are
It is constructed of a vertically elongated plate-like body with high rigidity in the front-rear direction and rigidity in the left-right direction set to a value that allows displacement in response to a predetermined load, that is, lateral force.

A pair of wheel supports 4.4 are connected to each rear end of the pair of trailing arms 1, 1 mentioned above.

This wheel bearing part 1-4.4 is a support that rotatably supports the wheel 5, that is, the rear wheel, and an extension part 4 that extends rearward from the wheel bearing part 4a of this wheel support 4.
b is integrally formed.

The pair of wheel supports 4, 4 described above are formed of a rigid body having load-bearing properties.

In this way, the above-mentioned wheel supports 4, 4 to which the rear ends of the above-mentioned trailing arms 1, 1 are connected at the front part thereof are connected.
A torsion beam 6 as a cross member is connected between the extending portions 4b, 4b.

This torsion beam 6 has an inverted U-shaped cross section and also functions as a stabilizer.

The left end of a lateral rod 8 connected to the right end of the above-mentioned torsion beam 6 via a lateral rod bracket 7 is supported by the vehicle body 3 via a lateral rod bracket 9.

Further, a shock absorber 10 and a coil spring 11 are provided between the inside of the wheel supports 4, 4 and the vehicle body 3 side.

J3, arrow F in FIGS. 1 and 2 indicates the front of the vehicle.

The illustrated embodiment is constructed as described above, and its operation will be explained below.

Now, when the vehicle is turned in the direction of arrow a in FIG. 1, a lateral force acts on the wheel 5.5.

Due to the action of this lateral force, the vertically long plate-shaped trailing arms 1, 1 are shaped as shown by imaginary lines in Fig. 1 (however, in the same figure, for convenience of illustration, only the displacement of one trailing arm 1 is shown). Since the small eel sabots 1 to 4 located between the trailing arm 1 and the extension part /lb are bent inward with respect to the turning direction,
The displacement follows the inward displacement of the
u can do it. As a result, there is an effect that the turning performance can be improved.

In addition, the above-mentioned trailing arms 1, 1J5cl: and wheel support 4.4 have high rigidity in the vertical and longitudinal directions, so that the toe changes (width changes) in response to loads in the vertical and longitudinal directions. There isn't.

Regarding the correspondence between the configuration of this invention and the above-described embodiment, the cross member of this invention corresponds to the torsion beam 6 of the embodiment, but the present invention is not limited to the configuration of the above-described embodiment. For example, the other end of the aforementioned lateral rod 8 whose one end is supported by the vehicle body 3 may of course be connected to the wheel support 4 in addition to the torsion beam 6.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a plan view of a rear suspension device for an automobile; FIG. 2 is a view taken along the line II-II in FIG. 1; and FIG. ■View from line arrows FIG. 4 is a schematic plan view of a vehicle showing a conventional example. 1... Trailing arm 3... Car rest 4... Wheel support 4a... Wheel bearing part 4b... Extension part 5...
Wheel 6...Torsion beam 8...
Lateral rod Figure 4-

Claims (1)

[Scope of Claims] 1. A pair of trailing arms extending in the longitudinal direction at the left and right positions of the vehicle, having front ends pivotally connected to the vehicle body and rear ends movable up and down; and the pair of trailing arms described above. a pair of wheel supports that connect the rear end of the ring arm to the front part and rotatably support the wheel; a cross member that connects between the extension parts extending rearward from the wheel bearing part of the wheel support; The pair of trailing arms is equipped with a lateral rod that is supported on the vehicle body and connected to the wheel support or cross member at the other end. An automobile rear suspension device consisting of a plate-shaped body set to a value that can be displaced against.