JPS6146332B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rear suspension for an automobile, and particularly to a rear suspension that utilizes the reaction force of a stabilizer (hereinafter referred to as stabilizer reaction force) to cause changes in tire posture such as toe-in.

BACKGROUND ART In the rear suspension of an automobile, in order to improve steering stability, riding comfort, etc., it is desired to have a rear suspension that allows tires to be toe-in during driving, especially when cornering. By toe-in, the tires have a slip angle to increase resistance against lateral force caused by centrifugal force applied to the vehicle body during cornering, and the grip of the rear wheels is improved, which strengthens the tendency for understeer. This is because the stability of the car can be improved.

It is also known that a camber change is applied to tires as a method of increasing drag during cornering. That is, by applying a reverse camber to the outer rear wheel during cornering, it is possible to increase the resistance against lateral force.

Conventionally, various types of rear suspensions have been known that have a toe-in effect against lateral force during cornering, but all of them are somewhat complex in structure. For example, the one described in Japanese Patent Publication No. 52-37649 uses three rubber bushings and the hardness of the bushings is changed, and the one described in West German Patent Publication No. 2158931 or West German Patent Publication No. 2355954 is The wheel hub is supported via a vertical shaft and a spring, making the structure complex.
Further, these rear suspensions only have the effect of toe-in, and cannot change the camber at the same time.

An object of the present invention is to provide a rear suspension that toes the rear wheels during cornering with an extremely simple structure.

A further object of the present invention is to provide a rear suspension having a structure that allows for camber change at the same time as toe-in.

The rear suspension of the present invention connects a vehicle body side support member such as a support arm that is swingably connected to the vehicle body and a wheel support member such as a wheel hub that rotatably supports a rear wheel by an elastic bushing. and one ball joint, and the wheel support member is movable around the ball joint, so that the tire posture can be changed relative to the vehicle body side support member, and the end of the stabilizer is moved behind the ball joint. The wheel support member is connected to the wheel support member, and the attitude of the wheel support member is changed to toe-in and reverse camber direction as necessary by a downward stabilizing force when a bump occurs on one side during cornering. be.

In other words, by using the stabilizing reaction force of the stabilizer when bumping, the wheel support member is rotated slightly clockwise around the ball joint when viewed from the left side of the vehicle, changing the attitude of the tire and producing a toe-in effect. This is a type of suspension in which the wheel support member can be elastically connected to the vehicle body side support member, and it is also possible to create a camber change at the same time. It can be applied to anything that can be attached.

In the present invention, the vehicle body side support member includes, for example, the semi-trailing arm of a semi-trailing type rear suspension, the strut of a strut type rear suspension, the upper and lower arms of a cross-bond type rear suspension, and the upper and lower arms of a deion type rear suspension. This is a general term for various supporting members attached to the vehicle body side, such as the rear suspension tube, and the type of rear suspension that is the subject of the present invention includes any type of rear suspension that supports tires in a toe-in manner. It is not limited to a specific thing.

According to the rear suspension of the present invention, when a lateral force is applied during cornering, the stabilizing reaction force generated by the bump on one side effectively causes the outer ear to toe-in, providing sufficient resistance against the lateral force, resulting in stable driving. is realized. At the same time, it is also possible to use the stabilization reaction force to create camber changes, which, combined with the effect of the stabilizer, realizes even more stable cornering.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example in which the present invention is applied to a strut type twin link suspension. In this rear suspension, the lower part of a bracket 13 that rotatably supports a tire 12 is connected to the rear end of a lower link 11 that is connected to one end of a vehicle body side mount 10 and extends rearward. This bracket 13
is further coupled to the vehicle body by two lateral links 14. A drive shaft 17 extends from a differential 16 supported by a cross member 15 to a wheel hub 18 connected to a bracket 13 and is connected thereto. The wheel hub 18 is connected to the bracket 13 by two rubber bushes 19, 20 and one ball joint 21 so that it can rotate around the ball joint 21 and change its attitude.

The wheel hub 18 has an arm 22 extending rearward.
is integrally provided, and the tip 22 of this arm 22
The lower end of a control rod 24 whose upper end is connected to the end 23a of the stabilizer 23 is connected to a. The bracket 13 is connected to the lower end of the shock absorber 25 of the strut.

The control rod 24 extends vertically and applies the stabilizing reaction force of the stabilizer 23 to the end of the arm 22 from top to bottom.

In the present invention, the wheel hub 18 is rotated around one ball joint 21 by the stabilizer reaction force, and at this time, the wheel hub 18 is displaced in the toe-in direction by the elasticity of the rubber bushes 19 and 20. . Below, wheel hub 18
The various forms will be explained in detail with reference to FIGS. 2, 3 and 4.

Figure 2 shows a wheel hub 3 with a ball joint 31 arranged at the rear and upper part around the wheel center WC, and rubber bushes 32 and 33 arranged at the lower front and rear.
0 and extends rearward from the wheel hub 30 via the ball joint 31.
4a, an end 36a of a stabilizer 36 is connected to the stabilizer 36 via a control rod 35 extending upward. Rubber bush 32, 33
The front rubber bushing 32 is arranged with the front facing inward, and the rear rubber bushing 33 is arranged with the front facing outside.

In this example, the stabilizer 36
The vertical component force V of the stabilizer reaction force N applied from the stabilizer 36 acts downward at the end 36a of the stabilizer 36, acts downward on the tip 34a of the arm 34, and moves the wheel hub 30 around the ball joint 31 to the left of the vehicle body. Displace it clockwise (arrow A) when viewed from the front. At this time, the wheel hub 30 is displaced inwardly at the front and outwardly at the rear depending on the orientation of the rubber bushes 32 and 33, and its posture is changed in the toe-in direction T. In the illustrated embodiment, the control rod 35 is inclined with its bottom facing outward, and the horizontal component H of the stabilizer reaction force N also contributes to the displacement in the toe-in direction.

At this time, if the tip 34a of the arm 34 on which the stabilizer reaction force N acts is located inside the ball joint 31, the wheel hub 30 can be simultaneously displaced in the reverse camber direction by the stabilizer reaction force N. .

Figure 3 shows a wheel hub 4 with a ball joint 41 arranged at the rear and lower part around the wheel center WC, and rubber bushes 42 and 43 arranged at the upper front and rear.
This shows an example in which an end 46a of a stabilizer 46 is connected to a distal end 44a of an arm 44 extending rearward from a wheel hub 40 via a control rod 45 extending upward. The rubber bushes 42 and 43 are the front rubber bushes 42 and 43.
is arranged with its rear facing inward, and the rear rubber bushing 43 is arranged with its rear facing outside.

In this example, when a bump occurs on one side, the stabilizer 46
A vertical component force V of the stabilizer reaction force N applied from the stabilizer 46 acts downward on the end 46a of the stabilizer 46, and acts downward on the tip 44a of the arm 44 to move the wheel hub 40 around the ball joint 41 to the left of the vehicle body. Displace it clockwise (arrow A) when viewed from the front. At this time, the wheel hub 40 is displaced inwardly at the front and outwardly at the rear depending on the orientation of the rubber bushes 42 and 43, and its posture is changed in the toe-in direction T. In the illustrated embodiment, the control rod 45 is inclined with its bottom facing outward, and the horizontal component H of the stabilizer reaction force N also contributes to the displacement in the toe-in direction.

At this time, if the tip 44a of the arm 44 on which the stabilizer reaction force N acts is located inside the ball joint 41, the wheel hub 40 can be simultaneously displaced in the reverse camber direction by the stabilizer reaction force N. .

In the embodiment shown in FIGS. 2 and 3 above,
In either case, the wheel hub can be displaced in the toe-in direction by utilizing the stabilizing reaction force caused by a bump on one side during cornering, but in addition, the arrangement of the ball joint and rubber bushing allows the use of lateral force due to centrifugal force during cornering. The wheel hub can be displaced in the toe-in direction. That is, in each of these embodiments, the ball joint is located behind the wheel center WC,
Since the rubber bushing allows the wheel hub to move around the ball joint, the lateral force S that acts on the lower end of the tire from the outside to the inside during cornering has the effect of changing the wheel hub around the ball joint in the toe-in direction. have

As is clear from the above description, the rear suspension of the present invention displaces the wheel hub, which is displaceably supported by the ball joint and rubber bushing, in the toe-in direction by the downward force of the stabilizing reaction force. With an extremely simple structure, it uses the force naturally generated during cornering to create a toe-in effect.
Its practical usefulness is extremely high. Also, camber changes can be made possible based on this structure.

In addition, although two rubber bushes are used in the above embodiment, the number of rubber bushes may be one, and the rubber bush is only a type of structure for elastically supporting the wheel hub, and other rubber bushes may be used. It goes without saying that elastic support means can be used instead.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example in which the present invention is applied to a strut type rear suspension, and FIGS. 2 and 3 are perspective views showing various embodiments of the wheel support structure of the present invention. 12...Rear wheel of the car, 13...Bracket, 14
... Lateral link, 18, 30, 40 ... Wheel hub, 19, 20, 32, 33, 42, 43
...Rubber bush, 21,31,41...Ball joint, 22,34,44...Arm, 2
3, 36, 46... Stabilizer.

Claims (1)

[Claims] 1. A vehicle body side support member that is swingably connected to the vehicle body, a wheel support member that rotatably supports a rear wheel, and a vehicle body side support member that is located between the vehicle body side branch member and the wheel support member and that elastically connects both. combined with
An elastic bushing capable of changing the attitude of the wheel support member relative to the vehicle body side support member;
an elastic connection means consisting of a ball joint;
and a stabilizer whose end portion is connected to the wheel support member behind the ball joint, and which displaces and changes the attitude of the wheel support member around the ball joint by the stabilizing reaction force when bumping on one side, and when bumping on one side, the stabilizer A rear suspension for an automobile characterized in that a toe-in effect is sometimes produced by a stabilizing reaction force.