JPH01195107A - Suspension device for vehicle - Google Patents

Abstract

PURPOSE:To improve an effect of preventing wind-up vibration by pivoting both ends of a torque rod for generating regulating force in only one direction of compression or tension on a car body and an axle housing or an elastic support member, respectively in the longitudinal direction of the car body in an axle type suspension device. CONSTITUTION:The forward end of a torque rod 20 is pivoted on a cross member 2 through a bracket 21, and the rear end thereof is pivoted on an axle housing 3 through a lateral rod fixing bracket 11. Each of rubber bushes 22 on both ends of the torque rod 20 has a theft 27 formed on the outside portion in the axial direction of the torque rod from the center of a rubber 25, whereby the rubber hardness of the inside portion 25a in the axial direction is higher than that of the other portion so as to generate regulating force only in one direction of compression or tension. By this arrangement, wind-up vibration can be effectively prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a suspension device for a vehicle, and more particularly to an axle-type suspension device that suspends a drive wheel on a vehicle body using an axle housing that accommodates a drive shaft.

(Prior Art) Conventionally, this type of axle type suspension device has been constructed by connecting an axle housing to a pair of left and right leaf springs extending in the longitudinal direction of the vehicle body, as disclosed in, for example, Japanese Utility Model Application No. 61-120604. The so-called leaf spring type, which is elastically supported on the vehicle body, is generally well known.

Further, Japanese Utility Model Application Publication No. 60-66506 discloses a vehicle in which an air spring is interposed between one end of the leaf spring and the vehicle body. In this case, the leaf spring has less of a function of allowing vertical displacement than a leaf spring type, and this function is performed by the air spring.

By the way, in such an axle-type suspension device, elastic support members such as leaf springs that support the axle housing may wind up (wavy) due to torque generated in the axle housing as a reaction force of braking force or driving force during sudden deceleration or sudden acceleration. There is a problem in that unpleasant vibrations (wind-up vibrations) and rattling noises are generated due to this phenomenon.

Conventionally, in order to solve this problem, as disclosed in the above-mentioned publication (Utility Model Application No. 61-120604), a torque rod is arranged in the longitudinal direction of the vehicle body, and one end of the torque rod is The torque rod is connected to the vehicle body, and the other end is connected to an axle housing or a leaf spring, respectively, and the windup of the leaf spring is controlled by this torque rod. In this case, at the connection between the torque rod and the vehicle body, the torque rod is swingably connected to the vehicle body via a link member in order to prevent the torque rod from restricting bumps and rebounds of the wheels (driving wheels). At the same time, a stopper member is provided at a position apart from a predetermined swing area of the torque rod, so that when the torque rod comes into contact with the stopper member, the torque rod exerts a regulating force against wand-up. It is composed of In the case of the one disclosed in Japanese Utility Model Application Laid-Open No. 61-120604, a separate member is not used as the torque rod, but the stabilizer is also used.

(Problem to be Solved by the Invention) However, in the case of the above-mentioned conventional device, since the connecting portion of the torque rod on the vehicle body side is swingable, the elastic support member such as a leaf spring of the torque rod has a considerable wind-up. If the deformation is not caused, the regulating force for regulating the deformation cannot be exerted, and this is insufficient as a countermeasure against wind-up vibration.

The present invention has been made in view of the above, and its purpose is to solve the problem that, in the case of a vehicle equipped with an axle type suspension device, wand-up vibration is a problem both during sudden deceleration and sudden acceleration. Based on this fact, we have improved the conventional torque rod configuration to prevent wand-up vibration without restricting wheel bumps and rebound. This is to make it more effective.

(Means for Solving the Problems) In order to achieve the above object, the solving means of the present invention provides a suspension system for a vehicle in which an axle housing is supported on a vehicle body via a pair of left and right elastic support members extending in the longitudinal direction of the vehicle body. The torque rod is disposed in the longitudinal direction of the vehicle body and has one end pivotally supported by the vehicle body and the other end pivotally supported by the axle housing or the elastic support member. The torque rod is configured to generate a regulating force only in one direction of the compression direction and the tension direction, and not to produce a regulating force in the other direction.

(Function) With the above configuration, in the present invention, in the case of a vehicle in which wind-up vibration is a problem only during sudden deceleration and sudden acceleration, for example, the torque rod is moved in one of the compression direction and the tension direction. Even if the restricting force is not generated only in that direction, the wind-up of the elastic support member during sudden deceleration can be restricted by the restricting force in that direction, thereby preventing wind-up vibration. Moreover, since the regulating force is generated even when the windup of the elastic support member is small, the effect of preventing windup vibration is fully exhibited.

On the other hand, since the torque rod can tolerate the bump rebound of the wheel in a direction that does not produce a regulating force, the torque wood does not restrict the bump rebound of the wheel.

(Example) Embodiments of the present invention will be described below based on the drawings.

1 to 3 show a rear suspension system for a vehicle. In the case of this vehicle, there is a problem in that wind-up vibration is likely to occur during sudden deceleration, and one embodiment of the present invention improves the suspension device in order to cope with this problem.

1 and 3, 1 is a frame extending in the longitudinal direction of the vehicle body as a strength member of the vehicle body, 2 is a cross member connecting the left and right frames 1, 1, and 3 is an axle housing. Although not shown, a pair of left and right drive shafts connected to the rear wheels, which are the drive wheels, and a differential device that transmits the driving force transmitted via the propeller shaft to the left and right drive shafts are housed inside. It's called.

The axle housing 3 is supported by the vehicle body (frame 1) via a pair of left and right elastic support members 4.4 extending in the longitudinal direction of the vehicle body near the outer sides of the left and right frames 1.1. Each of the elastic support members 4 has a stepped portion at the center in the longitudinal direction, and the front side, which is the upper step side, is formed by overlapping two plate members. The front end of the elastic support member 4 is rotatably supported via a bracket 5 to the end of the cross member 2 of the frame 1 that protrudes to the outside of the vehicle body, while the rear end of the elastic support member 4 is vertically displaced by an air spring 6. The air spring 6 is attached to the frame 1. The axle housing 3 is attached to the longitudinal center of the elastic support member 4 in a suspended state.

Further, 7 is a stabilizer for suppressing the inclination of the vehicle body in the width direction, and the middle part of the stabilizer 7 is connected to the frame 1.
The end of the stabilizer 7 is connected to the rear end of the elastic support member 4.

8 is a shock absorber, and the upper end of the shock absorber 8 is connected to the frame 1, and the lower end is connected to the axle housing 3. Reference numeral 9 denotes a lateral rod extending in the vehicle width direction above the axle housing 3, and one end of the lateral rod 9 is attached to the frame 1.
The other end is attached to the axle housing 3 with a bracket 10, respectively.
or connected via 11.

Both ends of the lateral rod 9 are provided with bellow ball rubber bushings 12, 12, respectively, as shown in FIGS. 4 and 5.

The pillow ball rubber bushing 12 includes an outer cylinder 13 fixed to the lateral rod 9, an inner cylinder 14 arranged concentrically with the outer cylinder 13, and a space between the outer cylinder 13 and the inner cylinder 14 that is filled and fixed. A pillow ball 16 is rotatably fitted into the inner cylinder 14, and a support shaft 17 is provided to penetrate the pillow ball 16. The support shaft 17 has bolt insertion holes 18 at both ends thereof.
18, and a bolt 19 is inserted into each bolt insertion hole 18.
It is attached to bracket 11 or 12 through. Here, in the mounting structure of the lateral rod 9, the bellow ball rubber bushings 12 and 12 are particularly used.
Even when the lateral rod 9 receives a lateral load, a torsional force may act at the same time, so this is designed to prevent the rubber 15 from being twisted due to this torsional force.

Further, reference numeral 20 denotes a torque rod extending in the longitudinal direction of the vehicle body near the inside of the frame 1 on the right side of the vehicle body, and the front end of the torque rod 20 is pivotally supported by the cross member 2 via a bracket 21. On the other hand, the rear end is pivotally supported on the axle housing 3 using the bracket 11 for mounting the lateral rod. Torque rod 2 above
As shown in FIG.
It includes an inner cylinder 24 arranged concentrically with the outer cylinder 23, and a rubber 25 filled and fixed between the outer cylinder 23 and the inner cylinder 24. This rubber bush 22 has an inner cylinder 2.
A support shaft 26 is inserted through the support shaft 4, and is rotatably connected to the bracket 21 or 11 via the support shaft 26.

As a feature of the present invention, in each of the rubber bushes 22 at both ends of the door lock F20, a recess 27 is provided at a portion located outside the center of the rubber 25 in the torque rod axial direction, and a recess 27 is provided at a portion located outside the center of the rubber 25 in the torque rod axial direction. The portion 25a located on the inner side in the axial direction is made of rubber that is harder than the other portions. Therefore, the torque rod 20 responds to the external force acting through the rubber bushing 22 in the compression direction (the direction in which the inner cylinder 24 of the rubber bushing 22 is displaced toward the hard rubber portion 25a) of the compression direction and the tension direction. A drag force (this drag force acts as a restricting force against wind-up of the elastic support member 4) is generated only in the tension direction, and in the tensile direction, the outward displacement of the inner cylinder 24 of the rubber bushing 22 in the torque rod axial direction causes the slack 27 of the rubber 25. It is provided in such a way that it does not cause any drag force.

Next, to explain the effects of the above embodiment, when the vehicle suddenly decelerates, torque acts on the axle housing 3 in the counterclockwise direction of the axis in FIG. 1 due to the reaction force of the braking force.
Due to this, the elastic support member 4 may wind up. At this time, an external force acts on the torque rod 20 from the axle housing 3 side in the compression direction.
Since the torque rod 20 is provided so as to generate a resistance force in the compression direction, a restricting force is applied from the torque rod 20 to the elastic support member 4 via the axle housing 3 to restrict its windup. It became like this,
Thereby, wind-up vibration can be prevented. Moreover, the regulating force by this torque rod 20 is
Even when the elastic support member 4 causes a slight windup, an external force in the compressive direction acts on the torque rod 20 depending on the magnitude of the windup, so that the windup vibration can be sufficiently prevented. .

On the other hand, during bamboo rebound of the rear wheel, the axle housing 3 swings up and down about the vehicle body side support point (connection point with the bracket 5) at the front end of the elastic support member 4, and the torque rod 20 Side support point (bracket 2
It swings vertically together with the axle housing 3 around the support shaft 2F;) which is the connection point with the axle housing 3. At this time, an external force in the tensile direction acts on the torque rod 20 based on the difference between its swing locus and the swing locus of the axle housing 3, but the torque rod 20 exerts a drag force in the tensile direction. Therefore, no regulating force is applied from the torque rod 20 to the axle housing 3 to restrict its vertical swing, and the bump rebound of the rear wheel is not adversely affected by the torque rod 20.

It should be noted that the present invention is not limited to the above embodiments, but includes various other modifications.

For example, in the above embodiment, the torque rod 20 extending in the longitudinal direction of the vehicle body is arranged on the front side of the axle housing 3,
The front end of the torque rod 20 was pivoted to the vehicle body (cross member 2), and the rear end was pivoted to the axle housing 3.
As shown by the imaginary line in FIG. 1, the torque rod 30 may be arranged at the rear side of the axle housing 3, and its front end may be pivoted to the axle housing 3, and its rear end may be pivoted to the vehicle body. In this case, in a vehicle that is prone to wind-up vibration during sudden deceleration, the torque rod 30 generates a regulating force only in the tensile direction and does not produce a regulating force in the compression direction, contrary to the case of the above embodiment. Provided as follows.

Further, in the above embodiment, in order to generate a regulating force in only one direction of the compression direction and the tensile direction in the torque rod 20 and not to produce a regulating force in the other direction, the rubber bushings 22° 22 at both ends of the torque rod 20 are used. Although the slots 27 and the like are provided in each rubber 25, the same structure may be achieved using other means.

For example, a torque rod is constructed by connecting two link members, so that a regulating force is generated in the tensile direction, and the regulating force is not generated in the compressive direction due to the link members breaking at the connection point.

Further, in the above embodiment, the present invention is applied to a vehicle suspension device in which wind-up vibration is a problem during sudden deceleration, but it can also be applied to a vehicle suspension device in which wind-up vibration is a problem during sudden acceleration. Of course, the same can be applied.

(Effects of the Invention) As described above, according to the vehicle suspension device of the present invention, the elastic support member supports the axle housing during sudden acceleration or sudden deceleration without restricting the bump and rebound of the wheel with the torque rod. When widening occurs, even if the widening is small, it can be effectively restricted by the torque rod, and the effect of preventing windup vibration can be effectively enhanced.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a side view showing the overall structure of the suspension device, FIG. 2 is a plan view of the same, FIG. FIG. 5 is an enlarged sectional view taken along line A--A in FIG. 4, and FIG. 6 is a side view with a portion of the torque rod cut away. 3... Axle housing, 4... Elastic support member,
20.30...torque rod.

Claims (1)

[Claims] (1) In a suspension system for a vehicle in which an axle housing is supported by a vehicle body via a pair of left and right elastic support members extending in the longitudinal direction of the vehicle body, the axle housing is disposed in the longitudinal direction of the vehicle body,
A torque rod is provided with one end pivotally supported on the vehicle body and the other end pivotally supported on the axle housing or the elastic support member. A suspension device for a vehicle, characterized in that the suspension device is installed so as not to generate a restrictive force.