JPS58185307A - Trailing arm type suspension with lateral link - Google Patents

Abstract

PURPOSE:To improve the control stability of a car by arranging a pivoting point on the trailing arm side of a lateral link lower than a car body supporting part of the trailing arm in case of a suspension device for independently suspending car rear wheels inscribed in the heading. CONSTITUTION:The pivoting point 7 of a lateral link 6 on the trailing arm side is arranged at a lower position than the car body supporting parts 2, 3 of the trailing arm 1, and the line of a central axis 9 connecting the supporting points 2, 3 to the pivoting point 7 is inclined backward. When lateral eternal force F is inputted to a car wheel 5 at the time of turning travel to allow the trailing arm 1 to displace the car wheels 5 in the positive chamber direction with around the axis 9, in this arrangement A and B points move in outside direction of the car body. The radii of the traveling circular arc of A, B points are larger in the B point, so that the rear side of the car wheel 5 is more displaced by -DELTAgamma in the toe-in direction, showing a marked trend toward understeer. Accordingly, it is possible to improve the control stability of a car.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a trailing arm five-type suspension with lateral links that is used to independently R-mount the rear wheels of an automatic trunk.

This suspension is normally constructed as shown in FIG.

In the figure, reference numeral 1 denotes a trailing arm extending in the longitudinal direction of the electric body, which is supported at two points on its front side via elastic bushings 2.8 so as to be swingable in the vertical direction relative to the vehicle body. A spindle 1 is fixedly installed at the rear of the trailing arm 1, and a wheel 6 is rotatably supported on the rear wheel of the trailing arm 1 via the spindle 1. Additionally, KFi is a lateral link 6 extending in the lateral direction of the vehicle body between the rear wheel of the trailing arm 1 and the vehicle body.
is pivotally inserted through an elastic bushing 7.8, which supports a portion of the lateral external force input from trailing arm IK.

When viewed from the side, this suspension becomes K as shown in Fig. 2 flL), and arrow 1b from the rear in this figure.
When viewed diagrammatically in the direction of arrow 10 from above, it becomes as shown in FIG. 2 (bl) and FIG. 2 (0), respectively.

Now, when turning, a lateral external force F is applied to the wheel 5 as shown in Figure 2 (°C).
When n7t is input, the trailing arm l moves around the axis @9 that connects its electric body support 2, δ and the trailing arm pivot point 7 of the lateral link 6, and the wheel 5
As shown in Fig. 3 fbl, the angle Kr is shifted toward the positive camber direction.
Displace only. By the way, in the conventional trailing arm type suspension, the trailing arm 1 supports the vehicle body so that the axis 9 is tilted forward as shown in FIG. 3(a). R
[,8 and the pivot point on the trailing arm side of the lateral link 6] are usually determined on the horizontal plane 10 passing through the center 0 of the wheel 51 and equidistant from this center. Considering the movements of the two points A and B, as shown in Fig.
The rear point B moves toward the inside of the vehicle body to point A', and the rear point B moves toward the inside of the vehicle body to point 87. The movement of these two points is shown in Figure 2 (CI
When K is transferred, the wheel 5 becomes Δ as shown by the imaginary line in this figure.
This results in a displacement of τ in the toe-out direction, and even though the suspension is a trailing arm type suspension with lateral links, the deflection steer tends to oversteer.
The same layer that worsens the steering stability of the vehicle when turning has been added to conventional suspensions.

In the present invention, if the trailing arm snow pivot point of the lateral link is placed at a lower position than the vehicle body support part of the trailing arm, the trailing arm behavior axis value in the camber direction will be tilted backwards. Therefore, from the viewpoint of solving the above-mentioned problem, we propose a further improved five-type trailing suspension with a lateral link characterized by this configuration. The present invention will be described in detail based on the following.

In the present invention, after bearing the wheels of the button trailing arm 1, mK, for example, L
A lateral link 6 is pivotally inserted between the free end and the vehicle body via an elastic bushing 7.8, and the trailing arm of the lateral link 6 is connected to the pivot point 1t-trail. Military support part 2 (8) of ring arm 1
Place it lower. Thus, the central axis 9 of the camber direction behavior of the trailing arm 1 connecting the support portion 2 (8) and the pivot point 7 tilts backward as shown in FIG. 8 (ILI), contrary to the conventional art.

In the suspension of the present invention, a lateral external force is applied to the wheel δ during turning. is input, and when the ton 1 swing arm 1 displaces the wheel 5 in the positive camber direction around the axis 9 as shown in FIG. On the other hand, since the distance SdB to the axis 9 is larger than the radius of each movement arc, that is, the point A and the point B, the wheel 5
#i As is clear from FIG. 8(C), the rear side in the direction of travel is displaced more to the outside of the vehicle body 11 than the front side, and is displaced by -4τ in the toe-in direction. Therefore, deflection steer tends to understeer, and wI! The stability of the vehicle during running can be completely improved.

In the above configuration of the present invention, the height difference between the vehicle body support portion 2 (8) of the trailing arm 1 and the trailing arm side pivot point F and O of the lateral link 6 is set to be greater than or equal to the bound stroke of all wheels 5. By doing so, the effects of the present invention described above can be achieved during any wheel travel of the wheels 5, and the steering stability can be further improved.

Furthermore, in the present invention, the lateral link 6 is positioned below the center 0 of the wheel 5, which increases the camber rigidity of the suspension, which has an additional advantage of completely improving steering stability. is obtained.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the general structure of a trailing arm type suspension with lateral link, Fig. 2 is a diagrammatic side ffi view of the pivoting mechanism, Fig. 2 fbl and Fig. 2 f0.
1Fi, respectively, a rear view and a diagrammatic plan view between the lines of sight in the directions of arrows Ib and IIC in FIG. 8(1), respectively. FIG. Same figure fat, (bl, &f
C+ is a diagrammatic side view, rear view, and plan view similar to FIGS. , 4... spindle, 5...
- Wheel, 6... Lateral link, 7.8... Elastic bushing for lateral link, 9... Center axis of behavior in camber direction of trailing arm. Figure 2 (C)

Claims (1)

[Claims] 1 Equipped with a trailing arm extending in the longitudinal direction of the vehicle body, the front end of the trailing arm is supported at three locations via elastic bushings on the vehicle body so as to be able to swing vertically, and the wheels of the trailing arm are pivotally supported. A lateral link extending substantially in the lateral direction of the vehicle body is provided between the vehicle body and the vehicle body, and the trailing arm support button of the trailing arm is compared to the vehicle body support button of the trailing arm. A trailing arm type suspension with lateral links that features a pivot point located at a lower position.