JPH0451364B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an independent rear suspension.

(Prior Art) In general, in this type of independent rear suspension, as shown in Japanese Patent Application Laid-open No. 56-90710, the wheel support body that supports the rear wheels in a freely rotatable manner generally has a One end of a pair of links extending in the width direction is connected via a rubber bushing, and the other end of these links is connected to the vehicle body via a rubber bushing, while the rear of the tension rod further extends substantially in the front-rear direction to the wheel support. It is known that the ends of the tension rod are connected via a rubber bushing, and the front end of this tension rod is connected to the vehicle body via a rubber bushing.

(Problem to be Solved by the Invention) In general, the compliance steer that tends to occur when an external force is applied to the rear wheels should ideally be zero in terms of steering stability, but the above-mentioned structure In a suspension, there are a large number of link members installed between the wheels and the vehicle body, and a large number of rubber bushings installed at the ends of these link members, so when a lateral or longitudinal external force is applied to the rear wheel, However, there was a problem in that the play in the joint portion of each link member and the deflection of each push were accumulated, resulting in a large change in the alignment value, and the occurrence of compliance steer.

In addition, in conventional strut-type rear suspensions, the bucking plate of the rear wheel brake device is fixed to the wheel support side, so the braking reaction force is received by the strut.
Another problem was that it was not possible to effectively suppress the phenomenon of the rear of the vehicle body lifting up during braking.

(Means for Solving the Problems) In order to solve these problems, the present invention provides a wheel support body that rotatably supports the rear wheels with a first support member extending in the vehicle width direction and extending in the vertical direction. A trailing arm is elastically supported on the vehicle body by a second support member, extends in the longitudinal direction of the vehicle body, and has its base end supported on the vehicle body and its distal end movable in the vertical direction. and fixing a bucking plate of a brake device attached to the rear wheel to the rear end of the trailing arm,
the wheel support on the trailing arm;
It was supported through the bearing so that it could rotate relative to each other.

(Function) By configuring the present invention as described above, the occurrence of compliance steer is suppressed as much as possible, and at the same time, by applying the braking reaction force downward to the vehicle body during braking, the rear of the vehicle body or the rear wheels are lifted during braking. This was done in an effort to reduce the amount of stress.

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

The rear suspension in the drawing shows a strut type independent suspension type rear suspension applied to a front engine front drive vehicle. In the drawing, 1 is a wheel hub integrally formed with a brake drum 2; A wheel support body 3 consisting of a spindle is rotatably supported via ball bearings 4, 4, while a disk wheel 6 with a tire 5 assembled thereon is removably fixed to the wheel hub 1 by bolts 7, 7. are doing.

Further, brake shoes 9, 9 supported by a bucking plate 8 are incorporated into the brake drum 6.

10 is a holder 3a provided on the wheel support 3
and the vehicle body B, and the second support member 10 is basically inserted into an outer cylinder 11 and movably in the axial direction with respect to the outer cylinder 11. It consists of a piston rod 12 and a suspension spring 13, and the lower end of the outer cylinder 11 is fixed to the holder 3a via a bracket 11a, while the inner cylinder 14 is bolted to the upper end of the piston rod 12.
4 through an elastic rubber 15 is fixed to the vehicle body B, and the suspension spring 13 is interposed between spring receivers 17, 17 assembled to the outer cylinder 11 and the piston rod 12, respectively. ing.

In the embodiment shown in the figure, in the rear suspension configured as described above, the wheel support 3
and the vehicle body B, a first support member 20 consisting of a single rod extending in the vehicle width direction, and a trailing arm 30 with excellent rigidity extending in the longitudinal direction of the vehicle body B.
are assembled as follows.

That is, one end of the first support member 20 is pivotally attached to the lower end of the support 3a of the spindle 3 via a rubber bushing, and the other end of the first support member 20 is attached to the vehicle body B. It is connected to a fixed bracket 21 via a rubber bush 22.

The trailing arm 30 has its front end pivotally connected to a support bracket 23 fixed to the vehicle body B via a rubber bushing 24, so that its free end side can swing vertically. The wheel support 3 is supported at the free end of the wheel 30 via a ball bearing 40.

Specifically, while a hub 41 is rotatably assembled to the wheel support 3 via a ball bearing 40, the free end of the trailing arm 30 and the butt are attached to a flange 42 provided on the hub 41. King plate 8 and bolt 43 and nut 44
Fixed via.

Next, the operation of the rear suspension constructed as described above will be explained with reference to FIGS. 2 and 3.

In general, the ground contact part of the tire 5 is attached in the front-rear direction (arrow X direction in Figure 2) and the lateral direction (second
arrow Y direction in the figure) or vertical direction (arrow Z direction in the figure 2)
These external forces cause various moments to act on the rear wheels. Specifically, due to external forces in the longitudinal direction, moments are mainly applied to the rear wheels in the direction of arrows MY or MZ in Figure 2. In addition, a moment mainly in the direction of arrow MX in FIG. 2 acts on the rear wheel due to an external force in the lateral or vertical direction.

In the rear suspension having the above structure, the moment acting on the wheel in the direction of arrow MZ in FIG.
The moment in the MY direction is mainly withstood by the trailing arm 30 and the strut 10, but the wheel support 3 of the wheel
is rigidly supported by the trailing arm 30 via a ball bearing 40,
The wheel support body 3 does not angularly displace with respect to the trailing arm 30, the connecting portion between the spindle 3 and the trailing arm 30 does not shake, and even when a moment in the wheel MZ direction is applied, The input to the rubber bush 24 interposed at the connecting portion between the vehicle body B and the trailing arm 30 is very small, and therefore the change in the rear wheel alignment value as a whole is very small.

Incidentally, the moment acting on the wheel in the direction of the arrow MX in FIG. 2 is withstood mainly by the second support member 10 and the first support member 20, as in the conventional case.

On the other hand, when driving, the brake shoes 9, 9 are pressed against the brake drum 2 due to the operation of the brakes, so that the bucking plate 8 supporting the brake shoes 9, 9 is buckled by a reaction force. It is about to rotate in the same direction as the rotational direction of the rear wheel, in the direction of arrow S in FIG.
As the trailing arm 30 rotates in the direction of arrow S in the figure, the front end side of the trailing arm 30, which is connected to the flange 42 of the hub 41 together with the plate 8, that is, the side connected to the vehicle body B, also rotates the wheel support 3. A braking reaction force acts on the vehicle body B in the direction of swinging the fulcrum in the direction of the arrow S in Fig. 3 and pulling the vehicle body B down.
This prevents the rear or rear wheels from lifting (anti-lift effect).

In the above embodiments, the present invention was applied to a strut-type independent rear suspension, but it may also be applied to a wisdombone-type independent rear suspension.

Further, in the above embodiment, the rear suspension of a front-drive vehicle in which the rear wheels are non-driving wheels is shown, but the present invention is not limited to this. In this case, as schematically shown in FIG. The holder 3c may be used to support the hub 41, which is rotatable via the holder 3c.

(Effects of the Invention) As described above, according to the present invention, compared to the conventional independent rear suspension of this type, the number of link members installed between the rear wheels and the vehicle body is small, and the link members are The number of rubber bushings interposed in the connecting portions of the wheels is also reduced, and in particular, since the wheel support is supported by the trailing arm via a ball bearing, the wheel support is There is no displacement or wobbling of the connecting part between the wheel support and the trailing arm, and the variation in toe-in of the rear wheel, which is a problem with conventional strut-type suspensions, is also reduced. It is also possible to eliminate the need for a mechanism to adjust the toe-in of the rear wheels, and as a whole, compliance steer that occurs when an external force is applied to the ground contact area of the rear wheels can be suppressed as much as possible and running stability can be improved. Additionally, the number of component parts was reduced, making it possible to reduce the weight of the vehicle.

Further, according to the present invention, when the brakes are applied while driving, the trailing arm fixed to the bucking plate is swung via a bearing by the brake reaction force acting on the bucking plate, and the trailing arm is moved to the rear of the vehicle body. In other words, it is possible to reliably prevent the rear wheel from lifting up.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing one embodiment of the present invention, and FIGS. 2 and 3 are explanatory diagrams of the operation of the present invention. Further, FIG. 4 is an explanatory diagram showing another embodiment. 3... Wheel support body, 8... Bucking plate, 10... Second support member, 20... First support member, 30... Trailing arm, 40... Bearing.

Claims (1)

[Claims] 1 Wheel support 3 that supports the rear wheel freely,
The first support member 20 extending in the vehicle width direction and the second support member 10 extending in the vertical direction elastically support the vehicle body B, extend in the longitudinal direction of the vehicle body B, and have their base ends connected to the vehicle body B. A trailing arm 30 supported so that its tip can swing vertically is provided, and a bucking plate 8 of a brake device attached to the rear wheel is fixed to the rear end of the trailing arm 30. An independent suspension type rear suspension characterized in that the wheel support body 3 is supported by the trailing arm 30 via the bearing 40 so as to be relatively rotatable.