JPH0352566Y2 - - Google Patents

Description

[Detailed explanation of the idea] Industrial applications The present invention relates to a rear wheel suspension system.

Conventional technology and its problems Conventionally, as a rear wheel suspension system, for example,
As described in Japanese Patent No. 90710, a wheel support that rotatably supports a rear wheel is connected to the vehicle body via a pair of links extending in the vehicle width direction, and a tension rod extending in the front-rear direction is connected to the wheel support. It is known to be connected to the vehicle body through a cable.

However, in the above structure, play in the joint of the link member installed between the rear wheel and the vehicle body and deflection of the rubber bushings interposed at the end of each link member are accumulated, and the alignment value changes greatly. , there was a problem where the occurrence of compliance steer was noticeable.

In order to solve this problem, the present applicant attached one end of a trailing arm 50 extending in the longitudinal direction to the vehicle body, and attached the other end to a wheel support 52 via a bearing 51, as shown in FIG. proposed a system in which the wheel support 52 was supported relatively rotatably (Japanese Patent Application No. 59-93343).
-236812). As a result, the wheel support 52
is not displaced or rattled with respect to the trailing arm 50, and compliance steer can be suppressed.

By the way, in order to connect the bearing 51 and the trailing arm 50, the bearing 51 is
A hub 53 is fitted onto the outer ring of the hub 53, and a flange 53a provided on the hub is connected to the trailing arm 50 by bolts 54 and nuts 55.
This requires a separate part called the hub 53, which has the disadvantage of increasing the number of parts.

In order to improve this, it is possible to form a flange 51a integrally on the outer ring of the bearing 51 and connect it to the trailing arm 50 by this flange, as shown in FIG. 51 must be specially processed, which poses a problem of high cost.

Purpose of the invention The present invention was devised in view of these conventional problems, and its purpose is to provide a rear wheel suspension system that does not require separate parts and can be constructed at low cost when attaching a bearing to one end of a trailing arm. Our goal is to provide the following.

Structure of the Invention In order to achieve the above object, the present invention has a cylindrical portion integrally formed at the other end of the trailing arm, and the cylindrical portion is fitted and fixed to the outer ring of the bearing.

That is, since the other end of the trailing arm is directly fitted to the outer ring of the bearing, separate parts such as a hub are not required, and a standard product can be used as the bearing, so it can be constructed at low cost.

DESCRIPTION OF THE EMBODIMENTS The drawing shows an example of a strut type independent suspension type rear wheel suspension system applied to a front engine front drive vehicle, in which 1 is a wheel hub integrally formed with a brake drum 2; It is rotatably supported by a wheel support 3 consisting of a spindle via wheel bearings 4, 4, while a disc wheel 6 with a tire 5 assembled thereon is removably attached to the wheel hub 1 with bolts 7, 7. . Further, brake shoes 9, 9 attached to a bucking plate 8 are incorporated in the brake drum 2.

10 is a carrier 3 provided integrally with the wheel support 3
A strut-type second structure installed between a and vehicle body B
The second support member 10 includes an outer shell 11, a piston rod 12 slidably inserted into the outer shell 11, and a suspension spring 1.
3, the lower end of the outer shell 11 is connected to the carrier 3a via a bracket 11a.
is combined with An inner cylinder 14 is bolted to the upper end of the piston rod 12, and an outer cylinder 16 connected to the inner cylinder 14 via an elastic rubber 15 is attached to the vehicle body B.
is fixed. Further, the suspension spring 13 is interposed between spring receivers 17, 17 attached to the outer shell 11 and the piston rod 12, respectively.

Reference numeral 20 denotes a first support member consisting of one side rod extending in the vehicle width direction;
One end of the first support member 20 is pivotally attached to the lower end of the carrier 3a of the wheel support 3 via a rubber bushing 19, and the other end of the first support member 20 is attached to a bracket 21 fixed to the vehicle body B via a rubber bushing. They are connected via 22.

Reference numeral 30 denotes a highly rigid trailing arm extending in the longitudinal direction of the vehicle body B, and one end of which is attached to a support bracket 23 fixed to the vehicle body B with a rubber bush 2.
4, and is pivotable in the vertical direction. The other end of the trailing arm 30 is attached to the wheel support 3 via a bearing 40 so as to be relatively rotatable. That is, as shown in FIG. 2, the other end of the trailing arm 30 is formed with a cylindrical portion 31 and an inwardly bent portion 32 at the tip of the cylindrical portion 31. 31
The bearing 40 is attached to the other end of the trailing arm 30 by being press-fitted into the outer ring 41 of the bearing 40 until the bent portion 32 abuts the end surface of the outer ring 41. A flange portion 33 is integrally formed around the cylindrical portion 31, and the flange portion 33 and the backing plate 8 are closely fixed by bolts 43 and nuts 44.

Next, the operation of the rear wheel suspension system having the above structure will be explained with reference to FIGS. 3 and 4.

In general, the ground contact part of the tire 5 is attached in the front-rear direction (arrow X direction in Figure 3) or in the lateral direction (the third
External forces are applied in the direction of arrow Y in the figure) or in the vertical direction (direction of arrow Z in figure 3), and various moments act on the rear wheels due to these external forces. Specifically, a moment mainly acts in the direction of arrow MY or MZ in FIG. 3 due to an external force in the longitudinal direction, and a moment mainly acts in the direction MX in FIG. 3 due to an external force in the lateral or vertical direction.

In the rear wheel suspension system with the above structure, the moment in the MZ direction is mainly handled by the trailing arm 3.
0, and the moment in the MY direction is mainly supported by the second support member 10. The wheel support 3 is rigidly supported by the trailing arm 30 via a bearing 40. Therefore, the wheel support 3 is not angularly displaced with respect to the trailing arm 30, and the joint portion between the wheel support 3 and the trailing arm 30 is not shaken. In addition, even if a moment in the MZ direction is applied, vehicle body B and trailing arm 3
The input to the rubber bushing 24 interposed at the connection with 0 is very small, and therefore the change in the rear wheel alignment value as a whole is very small.

Note that the moment in the MX direction is mainly supported by the second support member 10 and the first support member 20, as in the conventional case.

In the case of the above embodiment, when the brake is operated, the bucking plate 8 is moved by the reaction force shown by the arrow S in FIG.
However, as the bucking plate 8 rotates, the front end side of the trailing arm 30 connected to the plate 8, that is, the side connected to the vehicle body B, rotates around the wheel support 3 as a fulcrum. Since it swings in the direction of arrow S in the figure, it has a so-called anti-lift effect that prevents the rear part of the vehicle body B or the rear wheels from lifting up.

In addition, in the above embodiment, the trailing arm 30
Although the case is shown in which the end of the wheel support 3 is directly connected to the bucking plate 8, the present invention is not limited to this. For example, as shown in FIG. 5, one end of the wheel support 3 may be extended inward in the vehicle width direction. , one end of the trailing arm 30 may be attached to this extended shaft portion 3b via a bearing 40 so as to be relatively rotatable. In this case as well, a cylindrical portion 31 is integrally formed at one end of the trailing arm 30, and this cylindrical portion 31 is fitted onto the outer ring of the bearing 40.

The rear wheel suspension system according to the present invention is applicable to the strut-type independent suspension type rear wheel suspension system as in the above embodiment, as well as the Wissbone type independent suspension type rear wheel suspension system and the Japanese Patent Laid-Open No. 59 It can also be applied to the trailing link type beam suspension shown in Publication No. 29506, and especially in the latter, one of the two trailing arms is rotatably connected to one end of the axle beam via a bearing. In such cases, the structure of the present invention can be applied.

Further, the present invention can be applied not only to front-drive vehicles in which the rear wheels are non-driving wheels, but also to rear-wheel suspension systems for rear-drive vehicles in which the rear wheels are driving wheels.

Effects of the invention As is clear from the above explanation, according to the invention, a cylindrical part is integrally formed at the end of the trailing arm, and this cylindrical part is directly fitted and fixed to the outer ring of the bearing. Therefore, separate parts such as a hub are not required, and standard products can be used as bearings, so it can be constructed at an extremely low cost.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an example of the rear wheel suspension system according to the present invention, Fig. 2 is a partially enlarged view thereof, Fig. 3 is a diagram showing the force relationship when an external force is applied, and Fig. 4 is a brake operation. FIG. 5 is a sectional view of another embodiment, and FIGS. 6 and 7 are sectional views of a conventional structure. 3... Wheel support body, 5... Tire, 10... Second support member, 20... First support member, 30... Trailing arm, 31... Cylindrical part, 40...
Bearing, 41...outer ring.

Claims (1)

[Scope of utility model registration request] A wheel support body that rotatably supports a rear wheel is elastically supported on the vehicle body by a first support member extending in the vehicle width direction and a second support member extending in the vertical direction, and also extends in the front-rear direction and has one end. A vehicle body is provided with a trailing arm supported so as to be swingable in the vertical direction, and the wheel support body is supported at the other end of the trailing arm so as to be relatively rotatable via a bearing, in which A rear wheel suspension system, characterized in that a cylindrical part is integrally formed at an end, and the cylindrical part is fitted and fixed to an outer ring of a bearing.