JPS6148441B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rear wheel suspension system for a vehicle.

A trailing arm suspension system is commonly used as a rear wheel suspension system for automobiles.

Trailing arm suspension systems have wheels rotatably supported at the rear end of an arm whose front end is attached to a member on the vehicle body side so that it can rotate vertically. It is structured to absorb and reduce the transmission of vibrations from the wheel side to the vehicle body by interposing a pusher made of an elastic material such as, so when a side force acts on the wheel during turning, the pusher deflects and the wheel toes out. A problem arises in that the steering wheel is angularly displaced in the direction of the steering wheel, and the steering stability is deteriorated.

Various devices have been developed to deal with the above problems (for example, the
(see Japanese Utility Model Publication No. 125810, Japanese Utility Model Application Publication No. 55-125812, etc.), both have drawbacks such as complicated structure, large number of parts, and high cost.

The present invention uses a semi-trailing arm type suspension system as a rear wheel suspension system, and by using an extremely simple measure without adding any new parts, when a side force acts on the wheel, the wheel moves in the toe-in direction. The present invention will be described below with reference to embodiments shown in the accompanying drawings.

In FIG. 1, reference numerals 1 and 1' denote rear wheels, and the rear wheels 1 and 1' have outer arms 2 and 2', inner arms 3, and The cross member 4 is rotatably supported at the rear end portions of the cross member 4, and the cross member 4 connects support members 5, 5' provided on both sides of the cross member 4 to vehicle body members via bushes 6, 6' made of an elastic material such as rubber. Installed.

The support members 5, 5' are rotatably mounted on both sides of the cross member 4 through shafts 7, 7', for example, via hard rubber bushings or solid bearings, and are pivotally connected by the bearings 7, 7'. Arms 51, 51' and 5 extending in the longitudinal direction of the vehicle from the
2,52', and the arms 51,51' and 52,5
2' with bushes 6a, 6a' and 6b, 6
It is designed to be fixed to a vehicle body member (not shown) via b' with bolts or the like.

In the above, the front arms 51, 51' of the support members 5, 5' have attachment points a, a' to the vehicle body member at their front ends, which are pivot points to the cross member 4, that is, shafts 7,
The shafts 7, 7' are displaced outward toward the vehicle side with respect to the center point of
The center point of 7' and the line connecting points a and a' form a trapezoid that expands toward the front of the vehicle, and the front arm 5 is connected to the cross member 4.
The amount of offset A toward the front of the vehicle of the attachment points a, a' at the ends of the arms 1, 51' to the vehicle body member is
The offset amount B of the attachment points b and b' to the vehicle body member at the tip end of 2' is considerably larger than the offset amount B toward the rear of the vehicle.

In the present invention configured as described above, for example, when turning left, a side force acts on the outer wheel side, that is, one wheel 1, as shown by arrow F in FIG. 2, and is transmitted to the cross member 4 via the inner arm 3. The support member 5 on the side to which the side force is applied is rotated clockwise in FIG. 2 about the front attachment point a while deflecting the bush 6b on the rear side. In this case, the attachment point a is offset outward from the vehicle side with respect to the shaft 7, so the rear attachment point b of the support member 5 and the shaft 7 are diagonally forward toward the center of the vehicle as shown by the chain line in FIG. The wheel 1 on the side on which the side force acts is angularly displaced in the toe-in direction as shown by the chain line, thereby significantly improving steering stability.

Note that the wheel 1' on the opposite side is displaced toward the toe-out side as shown by the chain line in FIG. 2, but this does not cause any problem since the wheel 1' is on the inner wheel side.

When turning to the right, contrary to the above, a side force is applied to the wheel 1' side, and this wheel 1' is angularly displaced in the toe-in direction by rotating counterclockwise around the front attachment point a' of the support member 5'. , similarly to the above, it is possible to improve maneuverability.

FIG. 3 shows another embodiment of the invention, in this example the rear attachment point b of the support members 5, 5'
An example is shown in which the rearward offset amount B of and b' with respect to the cross member 4 is set to zero.

That is, in the embodiment of FIG. 3, the cross member 4
The rear portions of the support members 5 and 5' are attached to the vehicle body member via bushes 6b and 6b' at the pivot points of the support members 5 and 5',
The rest of the configuration is exactly the same as that in FIG.

Also in this example, when a side force acts on one wheel, the support member on that side accumulates the rear bushing 6b or 6b' and moves it to the front attachment point a.
Alternatively, rotating around a', displacing the axis attachment point with the cross member obliquely forward toward the center of the vehicle, and angularly displacing the wheel on the side where the side force is applied in the toe-in direction is the above-mentioned step. This is the same as in Figures 1 and 2.

As described above, according to the present invention, in a semi-trailing arm type wheel suspension system, the support member, which is attached to the vehicle body member through the bushings at two points on both sides of the cross member, is pivotably attached to the cross member. At the same time, the side force can be improved by an extremely simple measure in which the attachment point of the support member to the front vehicle body member is offset to the outside of the vehicle from the axle attachment point to the cross member. The wheels on the receiving side are angularly displaced in the toe-in direction, making it possible to significantly improve steering stability.There is no need to add any new parts, and this, coupled with the fact that it is inexpensive, is of great practical use. There are some things that can have the same effect.

In addition, in the present invention, even if the bushing interposed at the attachment part of the support member to the vehicle body member bends more than the side force, it will not adversely affect steering stability as described above, so the bushing is softer than the conventional one. It can be used to improve the ability to absorb and reduce vibrations from the wheel side, thereby reducing vehicle interior noise and significantly improving riding comfort.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing one embodiment of the present invention, and FIG.
The figure is an explanatory plan view schematically showing the operating state of the one shown in FIG. 1, and FIG. 3 is an explanatory plan view showing another embodiment of the present invention. 1, 1'...Wheel, 2, 2'...Outer arm,
3, 3'... Inner arm, 4... Cross member, 5, 5'... Support member, 6, 6'... Bush, 7, 7'... Axis.

Claims (1)

[Scope of Claims] 1. A rear wheel is rotatably supported by the rear ends of an outer arm and an inner arm whose front ends are rotatably attached to the cross member, and left and right support members are provided at both ends of the cross member. In a semi-trailing arm type rear wheel suspension system in which the front and rear ends of the left and right support members are attached to the vehicle body through bushings made of an elastic member such as rubber, the support members are attached to both sides of the cross member. At the same time, the amount of offset toward the front of the vehicle of the attachment point of the front end of the support member to the vehicle body member relative to the shaft attachment point is determined by the amount of offset toward the vehicle front side of the attachment point of the rear end of the support member to the vehicle body member. The amount of offset toward the rear of the vehicle is greater than the amount of offset toward the rear of the vehicle, and the attachment point of the front end of the support member to the vehicle body member is offset by a predetermined amount outward from the vehicle side with respect to the axle attachment points of the support member and the cross member. A vehicle rear wheel suspension system featuring: 2. Claim 1, characterized in that the amount of offset toward the rear of the vehicle of the attachment point of the rear end of the support member to the vehicle body member with respect to the axis attachment point of the support member and the cross member is zero. Rear wheel suspension system for vehicles.