JPS59130712A - Rear suspension of automobile - Google Patents

Abstract

PURPOSE:To enable a rear wheel to be effectively changed in the toe-in direction, by setting the connection point between a front side lateral link and a wheel supporting member to a position lower than that of the connection point between a rear side lateral link and the wheel supporting member. CONSTITUTION:Ends of front and rear lateral links 3, 4 in an almost equal length, mounted to a car body through bushes 5, 6 of elastic material, are turnably connected to front and rear parts of a wheel supporting member 1 respectively through bushes 7, 8 of elastic material. Here a connection point 7 between the front lateral link 3 and the wheel supporting member 1 is set to a position lower than that of a similar connection point 8 of the rear lateral link 4. In this way, when lateral force acts on a rear wheel, its front part largely changes to the inner of the car body than its rear part, and the rear wheel can be effectively changed in the toe-in direction.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rear suspension installed in an automobile.

In general, car glue! 2 suspension, while driving, loads act on the rear wheels in various directions, such as rearward braking force, upward bump force, and lateral force toward the center. It is known that it is preferable to control from 1 to roll so that the toe-in changes gradually in order to improve running stability.

Therefore, in the past, the rear wheels were changed toe-in in response to the above-mentioned braking force, and as an A7 suspension, a wheel support member that rotatably supported the rear wheels and the front and rear of the wheel support members were connected to the inside of the vehicle body. The above-mentioned vehicle is equipped with two front and rear lateral links that can swing vertically and in the front-rear direction, and a radius link that elastically connects the assembly consisting of the wheel support member and the lateral link to the vehicle body so that it can be slightly displaced in the vehicle front-rear direction. The distance between the connection portions of both lateral links with the wheel support member is set smaller than the distance between the connection portions with the vehicle body, and the wheel support member is moved rearward when a braking force is applied to the rear wheel. Therefore, it has been proposed to displace the front part of the wheel support member more inward in the vehicle body when viewed from the rear than the rear part, thereby changing the toe-in of the rear wheels (see Japanese Patent Laid-Open No. 153422/1982). There is.

In addition, as a rear suspension that changes the toe-in of the rear wheel in response to the bump force, we also provide a wheel support member that rotatably supports the rear wheel, similar to the above-mentioned V suspension, and a front and rear part of the wheel support member, respectively. Two parallel front and rear lateral links that are connected to the inside of the vehicle body and can swing in the vertical direction, and a radius link that restricts movement of the wheel support member in the vehicle body longitudinal direction,
The front lateral link and the rear lateral link are arranged so that the inclination angles are different from each other, and when a bump force is applied to the rear wheel (during a bump), the connection part between the front lateral link and the wheel support member is placed on the rear side. The JZ Ushichinoku U.S. Patent No. 3,759.5428 (see specifications and drawings) changes the toe-in of the rear wheels by displacing the lateral link and the wheel support member to a greater extent inward than the connection portion between the lateral link and the wheel support member. Proposed.

However, with a simple structure similar to the V-suspension described above, no system has yet been proposed that effectively changes the toe-in of the rear wheels (during turns when lateral forces are applied to the rear wheels). is the current situation.

The present invention has been made in view of the above circumstances, and has a simple structure so that when a lateral force acts on the rear wheel, the front part of the wheel support member is displaced more inward in the vehicle body than the rear part when viewed in plan. The purpose is to obtain a 1-1 inch change in the rear wheel by doing so.

For this purpose, the configuration of the present invention includes a wheel support member that rotatably supports a rear wheel, and a wheel support member that is arranged in the left-right direction of the vehicle body, and each base end is rotatably attached to the vehicle body via an elastic bush. , two front and rear lateral links whose tips are rotatably connected to the wheel support member via an elastic bushing, a radius link that restricts and covers the movement of the wheel support member in the longitudinal direction of the vehicle body, and an upper end portion. is attached to the vehicle body and has a lower end connected to the wheel support member, and the height of the connection point between the front lateral link and the wheel support member is the same as that of the rear lateral link and the wheel support member. This means that when a lateral force is applied to the rear wheel, the rear lateral link is positioned lower than the connection point between the front lateral link and the wheel support member. A larger external force acts on the connecting portion between the wheel supporting member and the wheel supporting member, greatly deforming the elastic bushing of the connecting portion, and displacing the front part of the wheel supporting member more inward than the rear part of the vehicle body. be.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below based on embodiments shown in the drawings.

1 and 3 show the Ruri A7 suspension according to the present invention, where 1 is a wheel support member that rotatably supports the rear wheel 2, and 3 d3 and 4 are two front and rear lateral links extending in the left-right direction of the vehicle body. The lengths of both lateral links 3.4 are set to be approximately equal. The air ends of each of the lateral links 3 and 4 are rotatably attached to the vehicle body via elastic bushings 5.6 each having an axis parallel to the longitudinal direction of the vehicle body.
An elastic bushing 7 is provided at the front end of the wheel support member 1, and at the rear end of the rear lateral link 4, the axis parallel to the longitudinal direction of the vehicle body is aligned to the right.
．． 8 and are rotatably connected. Further, the above-mentioned lateral links 3 and 4 are arranged at different levels from each other, and the height of the connection point between the front lateral link 3 and the wheel support member 1 is the same as the height of the connection point between the rear side lateral link 4 and the wheel support member 1. It is set to be lower than the

Further, 10 is a trailing link as a radius link extending in the longitudinal direction of the vehicle body, and the 1-railing link 10 has its front end attached to the vehicle body and its rear end attached to the inner side surface of the wheel support member 1. Elastic bushing 11.1
2, and is rotatably connected to a vertical plane in the longitudinal direction of the vehicle body, thereby restricting movement of the wheel support member 1 in the longitudinal direction of the vehicle body.

Roughly speaking, numeral 13 is a strut for cushioning the rise and fall of the rear wheel 2, and the upper end of the strut 13 is rubber-mounted to the vehicle body 14, while the lower end is connected to the upper part of the wheel support member 1. ing.

The structure of the elastic bushing used to connect the two parts as described above is, for example, in the case of an elastic bushing core for connecting the front lateral link 3 and the wheel support member 1, as shown in FIG. An elastic tube 17 is filled between the tube 15 and the outer tube 16, the outer tube 16 is fixed to the front lateral link 3, and the inner tube 15 is rotatably attached to the wheel support member 1 via the support shaft 18. This is how it was done.

Next, the effects of the above embodiment will be explained with reference to FIG. 5. When a lateral force Q toward the turning center acts on the grounding point P1 of the rear wheel 2 during turning, each lateral link 3, 4
The connection point Py between and the wheel support member 1, R3i! 5J:
Histra h 13 (1) I body 14 He 0) Tori A' point P
4, reaction forces R+, R2, and R3 are generated, respectively.

In this case, the height a of the connection point P2 between the front lateral link 3 and the wheel support member 1 is set lower than the height 1 of the connection point P3 between the rear lateral link 4 and the wheel support member 1. , the front lateral link 3 and the wheel support member 1
The reaction force [(ratio with 2 is R1/R2= (h - a )/ (
h −b ) >1.

However, 11 refers to the attachment of struts 1 to 13 to the vehicle body 1'l.
” is the height of point P4.

Therefore, the elastic bushing 7 on the front lateral link 3 side is affected by the lateral force more strongly than the elastic bushing 8 on the rear lateral link 4 side, and deforms to a greater degree by U degrees. It is possible to change the toe-in so that the rear wheel 2 faces inward of the vehicle body with respect to the traveling direction by displacing the rear wheel 2 more inward of the vehicle body in plan view than the rear portion.

In addition,] 2) Just like a book ■ → Compared to the conventionally known structure, the horizontal 3rd part of the bus suspension simply increases the height of the connection point between the front lateral link 3 and the wheel support member 1 by adjusting the height of the connection point between the rear lateral link 4 and the wheel support member 1. Since the connection point with the support member 1 is simply set at a low position, it can be implemented at low cost.

In the above embodiment, the trailing link 10 whose front end is connected to the vehicle body and whose rear end is connected to the 11-wheel support member 1 is used as a radius link that restricts the movement of the wheel support member 1 in the longitudinal direction of the vehicle body. However, in place of the trailing link 10, it is of course possible to use a leading link whose front end is connected to the wheel support member and whose rear end is connected to the vehicle body.

According to the present invention, the two front and rear lateral link tips are connected to the wheel support member via elastic bushings, and the front lateral link and the wheel support member are connected to each other. The height of the connection point is set to be lower than the connection point between the rear lateral link and the wheel support member.
C, the elastic bushing on the front lateral link side is more strongly influenced by the lateral force than the elastic bushing on the rear lateral link side, and deforms to a greater extent, causing the front part of the wheel support member to be more difficult to move than the rear part of the vehicle. It is possible to effectively change the toe-in of the rear wheel by largely displacing it inward of the body, thereby improving running stability.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, so Fig. 1 is a side view showing the overall structure of the rear suspension, Fig. 2 is a plan view thereof, Fig. 3 is a rear view thereof, and Fig. 4 is a front view. FIG. 5 is a partially cutaway plan view showing the connecting portion between the lateral link and the wheel support member, and is a diagram for explaining the load state of lateral force ++:'J. 1... Wheel support member, 2... Rear wheel, 3. /I...
Lateral links, 5, 6, 7.8... Elastic bushings, 10... Trailing links, 13... Scratches, 14... Vehicle body.

Claims (1)

[Claims] (1) A wheel support member that rotatably supports the rear wheel, and a wheel support member arranged in the left-right direction of the vehicle body, the base end of each of which is rotatably attached via an elastic bushing, and the tip end attached to the wheel support member. Two front and rear lateral links rotatably connected via elastic bushings, a radius link that restricts the movement of the wheel support member in the longitudinal direction of the vehicle body, an upper end portion of which is attached to the vehicle body, and a lower end portion of which is attached to the vehicle body. a strut connected to the wheel support member, and the height of the connection point between the front lateral link and the wheel support member is lower than the connection point between the rear lateral link and the wheel support member. A car rental space characterized by being set as follows.