JPH01190513A - Vehicle suspension device - Google Patents

Abstract

PURPOSE:To ensure smooth operation even though longitudinal force is exerted to wheels, by journalling a trailing arm and a wheel support member to each other through a specific swingable shaft which is laid so as to be offset with respect to a specific line. CONSTITUTION:A suspension device 1 comprises three lateral links 6 through 8 which are extended in the vehicle-widthwise direction and are journalled at their both ends to a support member 2 for a wheel 3 and a vehicle body, and a trailing arm 5 which is extended in the vehicle-longitudinal direction and is journalled to at both ends to the vehicle body and the support member 2. In this arrangement, the trailing arm 5 and the support member 2 are journalled to each other through a swingable shaft 22 having a center axis X laid in the longitudinal direction of the trailing arm 5. The swing shaft 22 is laid so as to be offset vertically from the center axis of the trailing arm 5 in the vehicle side journalling part, that is, the line connecting between the horizontal shaft 11 and the rotational center G.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a suspension device for a vehicle.

(Prior art) In general, an independent suspension has three lateral links extending in the vehicle width direction, one end of which is rotatably connected to a wheel support member and the other end of which is pivotally connected to the vehicle body, It is known that the vehicle includes a trailing arm that extends to the vehicle body, has one end attached to the vehicle body so as to be able to swing vertically, and has the other end coupled to the wheel support member. In this type of suspension, in order to ensure a change in the toe of the wheel, it is necessary to have a structure in which the bush portion at the pivot point between the trailing arm and the vehicle body can be allowed to move laterally. However, when the bushing part is structured to be able to move laterally, the lateral movement may create resistance to the vertical movement of the trailing arm, and the resulting force may cause the vehicle body to vibrate, resulting in poor ride comfort and noise. A problem arises in that it is undesirable in some respects. In an attempt to address such issues,
The connecting portion between the trailing arm and the wheel support member may have a joint structure that is rigid in the vertical direction and has a degree of freedom in the horizontal direction (i.e., connected via a vertical swing shaft). It has been proposed (for example, Utility Model 61
(Refer to Publication No.-59107).

(Problems to be Solved by the Invention) As in the above-mentioned known example, when the joint surface between the trailing arm and the wheel support member is made into a joint structure that is rigid in the vertical direction and has a degree of freedom in the horizontal direction, this kind of When a suspension is used as a driving wheel, a large bending force is applied to the wheel during a sudden start. There is a problem in that it requires a shaft or the like that has extremely high strength, making it difficult to apply it to drive wheels.

On the other hand, when the wheels are in a toe-in state when driving, if a backward force is applied to the wheels from unevenness on the road surface, there is a risk that the wheels will move in the toe-out direction using the joint part as a fulcrum. Steering instability such as oversteer may occur.

The present invention has been made in view of the above points, and an object of the present invention is to ensure smooth operation of a suspension even when a longitudinal force acts on a wheel.

(Means for solving the problems) In the present invention, as means for solving the above problems,
Three lateral links extend in the vehicle width direction, one end of which is pivotally connected to the wheel support member and the other end to the vehicle body, and one end of which extends in the longitudinal direction of the vehicle body, and one end of which is rotatably attached to the vehicle body. In a suspension device for a vehicle, the trailing arm and the wheel support member are connected to each other by a rocker having a central axis in the longitudinal direction of the trailing arm. It is pivotally connected via a moving shaft, and the swinging shaft is connected to a line connecting the axis of the trailing arm at the vehicle body side pivot point and the center of the wheel supported by the wheel support member. They are arranged offset in the vertical direction.

(Function) In the present invention, the following effects can be obtained by the above means.

That is, by pivotally connecting the trailing arm and the wheel support member via a swing shaft having a center axis in the longitudinal direction of the trailing arm, the longitudinal force transmitted from the wheel to the trailing arm is reduced. The bearing has a swing shaft having a center axis in the longitudinal direction of the trailing arm, which has sufficient strength, and the swing shaft is connected to the pivot point of the trailing arm on the vehicle body side. By being arranged offset in the vertical direction with respect to the line connecting the axis and the center of the wheel supported by the wheel support member, the force acting on the trailing arm when the wheel toe changes is transmitted to the trailing arm. The torsion of the pivot joint on the vehicle body side or the trailing arm will cause the holder to hold.
Even when a longitudinal force is applied to the wheel, the desired toe change characteristics are ensured.

(Embodiments) Hereinafter, some preferred embodiments of the present invention will be described with reference to the accompanying drawings.

The suspension device 1 of this embodiment is shown in FIGS. 1 to 4.
As shown in the figure, the wheel 3 rotatably supported by the wheel support member 2 is connected to the vehicle body 4, and includes a trailing arm 5, a first lateral link 6, a second lateral link 7, and a third lateral link. It is composed of a link 8 and a shock absorber 9.

The trailing arm 5 has a vertically wide plate shape and extends in the front-rear direction of the vehicle body, and its front end extends around a horizontal axis 11 extending in the vehicle width direction with respect to the main frame 10 of the vehicle body 4 via a rubber bush 12. The rear end is connected to the wheel support member 2 via a connecting means which will be described in detail later.

The first lateral link 6 extends substantially laterally with respect to the vehicle body 4, and one end thereof is rotatable via a rubber bush 13 about a horizontal axis extending substantially in the longitudinal direction of the vehicle body with respect to the wheel support member 2. The other end is
Said main frame! It is rotatably mounted via a rubber bush 14 around a horizontal axis extending approximately in the longitudinal direction of the vehicle body.

The second lateral link 7 and the third lateral link 8
Like the first lateral link 6, the rubber bushings 15 and They are rotatably attached via rubber bushes 16, and their other ends are attached to the rear subframe that constitutes the vehicle body 4! 7 through rubber bushings 18 and 19 around a horizontal axis extending substantially in the longitudinal direction of the vehicle body. The mounting positions of the lateral links 6, 7, and 8 on the wheel support member 2 are not in a straight line in a vertical plane in the longitudinal direction of the vehicle body. Further, the mutual lengths of these lateral links 6, 7, 8 are made to increase in the order of the first lateral link 6, the second lateral link 7, and the third lateral link 8.

Surface 5 Shock absorber 9 (equipped with a coil spring 20 and a damper 21, extends in the vertical direction, and its lower end is rotatable about a horizontal axis extending in the vehicle width direction with respect to the wheel support member 2) The upper end thereof is attached to the vehicle body 4.

The rear end of the trailing arm 5 and the wheel support member 2 are connected to each other via a connecting means which will be described in detail below.

The coupling means Δ consists of a swing shaft 22 having a central axis X in the longitudinal direction of the trailing arm 5, and a bearing sleeve 23 configured to pivotally support the swing shaft 22. The dynamic shaft 22 is fixed to the wheel support member 2, while the bearing sleeve 23 is fixed to the lower end of the trailing arm 5.

The bearing cylinder 23 has an inner cylinder 24 and an outer cylinder 2, as shown in FIG.
5, a rubber bumper 26 is filled and welded between the inner cylinder 24 and the inner cylinder 24, and after the swing shaft 22 is inserted into the inner cylinder 24,
By screwing a nut 27 onto the tip of the output shaft 22, the swing shaft 22 and the inner cylinder 24 are integrally connected. Compliance in the longitudinal direction of the vehicle body is determined by the rubber bushing 2.
This is ensured by the axial deflection of 6. Further, the swing shaft 22 is centered at the pivot point of the trailing arm 5 on the vehicle body side (i.e., the horizontal axis lI
) and the rotation center G of the wheel 3 supported by the wheel support member 2. As a result, when a lateral force acts on the wheel 3, the lateral force is absorbed by the torsion of the trailing arm 5, so the restraint force when the wheel 3 changes toe is relaxed, and the This ensures smooth operation of the ring arm 5.

With the above configuration, the following effects can be obtained in the suspension device of this embodiment.

That is, the longitudinal force transmitted from the wheels 3 to the trailing arm 5 is received by the swing shaft 22 having the central axis Become. In particular, as in this embodiment, when the structure is such that a rubber bumper 26 is filled and welded between the inner cylinder 24 that fixes the swing shaft 22 and the outer cylinder 25 that is fixed to the trailing arm 5 side, the rear compliance is Since this can be ensured by the axial deflection of the rubber bushing 26, it is extremely strong in terms of strength. Furthermore, the swing shaft 22 is
Disposed offset in the vertical direction with respect to a line ρ connecting the axis (i.e., horizontal axis I+) of the vehicle body side pivot portion of the trailing arm 5 and the center of the wheel 3 supported by the wheel support member 2. As a result, the force acting on the trailing arm 5 when the vehicle width 3 changes toe is supported by the torsion of the trailing arm 5 and the torsion of the rubber bush 12, and a longitudinal force is applied to the wheel 3. Even in this case, the desired toe change characteristics can be ensured.

FIG. 6 shows another embodiment of the present invention, in which the rubber bumper 26 in the coupling means A is
A gap S, S is formed between the rubber bush 26 and the outer cylinder 25 by cutting out a certain amount from both sides in the vehicle width direction. With this configuration, the swing shaft 22 that is integrally connected to the inner cylinder 24 is difficult to swing vertically and easily swings horizontally, and is sufficiently resistant to the rotational force of the wheels 3. While this makes it more durable, it also makes it easier to change the toe of the wheel 3.

Another embodiment of the invention is shown in FIGS. 7 and 8. In this case, the swing shaft 22 is coupled to the trailing arm 5 via a pair of bellow balls 28, 28 arranged on the same axis X. In this embodiment, the trailing arm 5 includes two plate-like members 5a,
The bearing portion 29 is formed by bending the plate-like members 5 a, 5 a into an L-shape with the lower rear ends facing away from each other.
The pillow ball 28.28 is pivotally supported on a support shaft 30.30 installed on the bearing portion 29.

That is, in the case of this embodiment, the swing shaft 22 has a coupling structure that does not allow swinging in the vertical direction, but allows swinging in the left-right direction. Therefore, while being able to sufficiently withstand the rotational force of the wheel 3, the toe change of the wheel 3 is made easier.

It goes without saying that the present invention is not limited to the configurations of the embodiments described above, and that the design can be modified as appropriate without departing from the gist of the invention.

(Effects of the Invention) As described above, according to the present invention, three lateral links extend in the vehicle width direction and are pivotably connected at one end to the wheel support member and at the other end to the vehicle body, Extending in the longitudinal direction of the vehicle body,
In a suspension device for a vehicle, the trailing arm is attached at one end to a vehicle body so as to be swingable in the vertical direction, and the other end is coupled to the wheel support member. are pivotally connected via a swing shaft having a center axis in the longitudinal direction, and the swing shaft is supported by the axis of the trailing arm at the vehicle body side pivot portion and the wheel support member. Since the arrangement is vertically offset from the line connecting the center of the wheel, the longitudinal force transmitted from the wheel to the trailing arm is received by the swing shaft, which has a center axis in the longitudinal direction of the trailing arm. This makes it possible to have sufficient strength and withstand the force that is applied to the trailing arm when the wheel toe changes, and the torsion of the trailing arm on the vehicle body side or the torsion of the trailing arm does not absorb the force that acts on the trailing arm when the toe of the wheel changes. This has the excellent effect of ensuring desired toe change characteristics even when longitudinal force is applied to the wheel.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a suspension device for a vehicle according to an embodiment of the present invention, FIG. 2 is a perspective view of the suspension device shown in FIG. 1, and FIGS. 3 and 4 are the suspension device shown in FIG. 1. The top view and rear view of the
6 is a diagram corresponding to FIG. 5 in a suspension device according to another embodiment of the present invention, and FIG.
This figure is a view corresponding to FIG. 1 showing a suspension device according to another embodiment of the present invention, and FIG. 8 is an enlarged sectional view taken along the line 1--2 of FIG. 7. l...◆...Suspension device 2...Wheel support member 3...Wheel 4...Vehicle body 5...Trailing arm 6...First lateral link 7...Second lateral link 8...Third lateral link 22...Rotating axis Q... ...Line G ...Rotation center X ... Central axis [] Fig. 3 Fig. 4 Fig. 5 Fig. 6

Claims (1)

[Claims] 1. Three lateral links extending in the vehicle width direction, one end of which is rotatably connected to the wheel support member and the other end to the vehicle body, and extending in the longitudinal direction of the vehicle body, one end of which is swingable in the vertical direction. A suspension device for a vehicle, comprising a trailing arm attached to a vehicle body and the other end coupled to the wheel support member, the trailing arm and the wheel support member being centered in the longitudinal direction of the trailing arm. The shaft is pivotally connected via a swing shaft having a shaft, and the swing shaft is relative to a line connecting the axis of the trailing arm at the vehicle body side pivot point and the center of the wheel supported by the wheel support member. A suspension device for a vehicle, characterized in that the suspension device is arranged offset in the vertical direction.