JPS6053414A - Rear suspension of car - Google Patents

Abstract

PURPOSE:To improve the traveling stability of a car by supporting a wheel bearing member with a swing arm extending along the car body and three lateral links extending across the car body and by specifying the fitting points to the wheel bearing member of the two links which are arranged on the lower side. CONSTITUTION:A swing arm 18 is provided, which is plate-shaped and extending along the car body and which is fixed, at one end, to the car body via a horizontal transverse shaft 38 in such a manner as to permit free rotation about this shaft and also fixed, at the other end, to a wheel bearing member 12 with a bolt 30. Also the first through third lateral links 20, 22, 24 are provided, each of which is fixed, at one end, to the wheel bearing member 12 via a horizontal shaft extending practically along the car body in such a manner as to permit free rotation about this shaft and also fixed, at the other end, to the car body in the same manner, permitting free rotation. In this case, the fitting points to the wheel bearing member of the links 20 and 24, which are set on the lower side than the fitting point of the link 22, are arranged on the front and rear sides of the line connecting the fitting point of the link 20 and the receiving point P of the transverse force to a wheel 10. Additionally, the distances 11, 12 from that line to the fitting points of each link are set to be 11<12.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to improvements in rear suspensions for automobiles.

(Prior Art) A system called a trailing arm type or a semi-trailing arm type has been known as an independent rear suspension for automobiles.

This rear suspension system has a trailing arm that extends in the longitudinal direction of the vehicle and is attached to the vehicle body so that its front end can swing vertically, and a hub support member that supports the wheel center at the rear end of the trailing arm. is fixed. Further, a Danno 4- is arranged between the rear end of the trailing arm and the vehicle body above it. This type of rear suspension has a simple structure and is lightweight, but in order to sufficiently increase the lateral rigidity of the trailing arm, its cross-sectional shape must be made large and the attachment points to the vehicle body must be The lateral spacing must be wide, and the trailing arm becomes large, which is disadvantageous in terms of weight.

The structure that solves these problems is Jikaisho & 4-1.12
0! ; proposed by No. In this proposed structure, the front end of the trailing arm extending in the longitudinal direction of the vehicle body is swingably attached to the vehicle body, the wheel hub is supported at the rear end, and the trailing arm has a
The outer ends of the vertically arranged A-tree lateral links are connected to a rotating member, and the inner ends of the lateral links are rotatably connected to the vehicle body. This type of rear suspension is advantageous in that it does not require the rigidity of the trailing arm to be very high, but when the wheels move vertically relative to the vehicle body, even during upward movement, that is, when bumping, Even during downward movement or axle pounding, there is a tendency for the wheels to move in the toe-out direction, resulting in unstable steering such as oat R-steer while driving on a curved road.

(Objective of the present invention) An object of the present invention is to suppress the toe-out tendency caused by the vertical movement of the wheel in a rear suspension having a swing arm extending in the longitudinal direction of the vehicle body and a lateral link extending in the lateral direction. Moreover, it is an object of the present invention to provide a rear suspension for an automobile that can cause an appropriate toe angle change even in response to a lateral force applied to a wheel when turning, and can therefore further improve running stability.

(Configuration of the present invention) In order to achieve the above object, the present invention is configured as follows. That is, the present invention extends in the longitudinal direction of the vehicle body, has one end attached to the vehicle body so as to be swingable in the vertical direction, supports a wheel support member at the other end, and applies a force in the longitudinal direction and a rotational force in the wheel rotation direction to the wheel support member. It comprises a swing arm configured to be able to transmit transmission, and three lateral links extending in the lateral direction of the vehicle body independently of each other, one end of each lateral link being rotatably attached to the wheel support member, and the other end being rotatably attached to the vehicle body. , the attachment point of one lateral link on the wheel support member is arranged above the attachment point of the other two 2-chiral links, and the attachment point of the two lateral links is located above the attachment point of the seven lateral links. Distance between the attachment point of the lateral link placed on the front side of the two lateral links to the wheel support member and the straight line, which are arranged in front and behind the straight line connecting the point and the point where lateral force is applied to the wheel. The distance between the attachment point of the lateral link disposed on the rear side and the straight line is also shorter. In a preferred aspect of the present invention, the attachment point of the upper lateral link to the wheel support member is above and in front of the wheel center, and the attachment point of the lower front side of the lateral link is below the wheel center. and in front,
Attachment points of the lateral links arranged on the lower rear side are arranged below and rearward of the wheel center.

According to this configuration of the present invention, the posture of the wheel support member, and therefore the wheel, is regulated only by the three lateral links, and the arrangement of the three lateral links, that is, the vertical and vertical directions of each lateral link. The angle of inclination in the longitudinal direction, the length, the mounting position to the wheel support member, and the lateral rigidity at the mounting position must be determined appropriately. It becomes possible to control the toe change and can/S angle change of the wheel to a desired tendency during ramping, rebound, and when lateral force or longitudinal force is applied to the wheel.

In the present invention, one of the three lateral links is attached to the wheel support member above the other two, and the one lateral link attached below is located at the front and rear of the wheel center. Therefore, toe changes when a wheel bump or rebound occurs or when a lateral force is applied to a wheel are controlled by these two lower lateral links.

The swing arm only needs to have the strength and rigidity to transmit force in the longitudinal direction of the vehicle body and rotational force in the wheel rotation direction.
It is necessary to avoid constraining the attitude control of the wheels by the three lateral links. To achieve this, it is necessary to reduce the lateral rigidity of the swing arm so that the swing arm can flex laterally during bangs, rebounds, etc., or to attach the swing arm so that it can be displaced laterally relative to the vehicle body, or to The swing arm may be configured to allow lateral displacement of the wheel support member by, for example, arranging the arm and the wheel support member such that relative displacement is possible.

(Effects of the Invention) According to the present invention, three lateral links extending in the lateral direction of the vehicle body are provided, and the attachment points of these lateral links to the vehicle body support member are positioned higher than the other one. , and the lower one lateral link is located at
The distance between the wheel-side attachment point of the front link and the straight line is also shorter than the distance between the rear attachment point and the straight line. Therefore, when a lateral force acts on a wheel during a turn, the reaction force on the front link increases, and as a result, the amount of deformation of the bushings, etc. on the front side becomes larger than on the rear side. relatively large displacement inward. That is, the wheels tend to slightly toe-in. Therefore, running stability can be improved. In addition, since the three lateral links are arranged at regular intervals, the reaction force of the lateral force can be dispersed and supported, which is advantageous in ensuring rigidity against the lateral force.

(Description of Embodiments) Referring to FIGS. 1 to 5, a wheel 10 is rotatably supported by a wheel support member 12, and a suspension device 1
4 to the vehicle body 16. Suspension device 14H, swing arm 18, first lateral link 20, second lateral link 22, third lateral link 2
4 and shock azosoba 26.

The swing arm 18 has a vertically wide plate shape and extends in the longitudinal direction of the vehicle body, and the front end has a rubber bush 39 fixed to the swing arm 18 and a bolt 38 passing through the rubber bush.
It is attached to a bracket 29 provided on the main frame 28 of the vehicle body so as to be rotatable around a horizontal axis in the lateral direction of the vehicle body, and its rear end is attached to the wheel support member 12. Ruto 30 has a fixed anus. The first lateral link 20 extends substantially transversely to the vehicle body, and has one end attached to the wheel support member 12 via a rubber bushing 20a so as to be rotatable around a horizontal axis in the longitudinal direction of the vehicle body, and the other end to the vehicle main frame 28. Similarly, it is mounted via a rubber bushing so as to be rotatable around a horizontal axis extending approximately in the longitudinal direction of the vehicle body. The second lateral link 22 and the third lateral link 24 each have one end connected to the rubber bush 22.
It is rotatably attached to the wheel support member 12 via a and 24a'e on a horizontal axis extending approximately in the longitudinal direction of the vehicle body, and is similarly mounted substantially in the longitudinal direction of the vehicle body to the rear subframe 32 on the vehicle body side via rubber bushes 22b and 24b. It is mounted so that it can rotate around its horizontal axis. The shock azo soaper 26 includes a coil spring 34 and a damper 36, extends in the vertical direction, has a lower end rotatably attached to the wheel support member 12, and an upper end rotatably attached to the vehicle body 16. It is being Referring to FIG. 5, each lateral link 20,
22, the link 24 is located below the wheel support member 12 from the wheel center 40.
are installed in each. Then, the attachment point of the twelfth tilt link 20, that is, the bush 20a, is connected to the straight line connecting the attachment point of the twelfth tilt link 22 to the wheel support member 12, that is, the center of the push seat 122a, and the point P where the lateral force is applied to the wheel. The distance 11 between the center of the bush 24a and the straight line is shorter than the distance 12 between the attachment point of the 32nd chiral link 24, that is, the center of the bush 24a and the straight line.

When the wheel 10 receives a force in the vertical direction, the wheel 10 is displaced in the vertical direction, and the swing arm 18 swings around a gel 38 for attaching its front end to the vehicle body.

Therefore, the wheel center 40 is displaced along an arcuate trajectory centered on the bolt 38 at the front end of the swing arm 18. In this case, since the wheel support member 12 is laterally supported by the three lateral links 20.22.24, the lateral links 20.22.24 also swing vertically, and their outer ends swing. Displaces laterally with movement. In the lateral link arrangement of the illustrated embodiment, the first lateral link 20 is laterally outwardly inclined slightly rearwardly and downwardly and has the longest length among the three lateral links. It's short. The third lateral link 22 is inclined slightly forward and upward toward the outer side in the lateral direction, and the third lateral link 24 is inclined slightly downward toward the outer side in the lateral direction. With this arrangement, for example, if the wheel is displaced upward, the outer end of the first lateral link 20 will be slightly displaced outward, but since the link 20 has a rearward inclination, it will not move outward. The amount of displacement is small. The outer end of the lateral link 22 is displaced inwardly as the wheel is displaced upward.

Further, the outer end of the third lateral link 24 is displaced outward,
The amount of displacement is also larger than the amount of displacement of the outer end of the first lateral link 20. Since the outer ends of the third lateral links 20 and 22 are located forward of the outer ends of the third lateral links 24, a slight toe-in tendency occurs as a whole, and the camber angle decreases.

A downward displacement or rebound of the wheel results in a slight toe-out and a slight increase in camber angle. In other words, for the vertical displacement of the wheel, curve I is shown in Figure 6.
The toe angle changes as shown by Ja, and the camber angle changes have a similar tendency. The curve in Figure 6 is Jitsukai Showa 3A-A
, 2.20! This figure shows the toe angle change in the suspension of No.

With this change in the attitude of the wheel, the swing arm 1
The rubber bushing 39 that attaches the swing arm 18 to the vehicle main frame 28 has an axial deviation, so that the swing arm 18
produces the required amount of lateral displacement.

When a lateral force is applied to the wheel, such as when traveling on a curve, the attachment point ij[,
However, the attachment points of the third lateral links are separated by 12, and there is a relationship of 12>Ill between them. Therefore, the third
The reaction force generated on the lateral link 24 is greater than the reaction force generated on the seventh lateral link 20, and the amount of lateral displacement caused by deformation of the bushing is also greater on the first lateral link 20. . Therefore, the wheel 10 undergoes slight toe-in liquefaction due to the difference in displacement of the links 20,24.

Furthermore, with this arrangement, there is almost no change in toe angle in the front and rear directions.

FIG. 7 shows another embodiment of the present invention, in which the same parts as in the previous example are denoted by the same reference numerals. In this example, the arrangement of three lateral links 20, 22, and 24 is changed. ! Referring to FIG. 4
the second lateral link 22 is located above and in front of the axle 40;
The 32nd chiral links 24 are provided several times below and at the rear of the axle 4o. Even with this arrangement, the effect is the same as the previous example. In addition, as shown in the example shown, if one 2-chiral link is placed above the wheel center and the other two are placed below the wheel center, front and rear, the axial forces of the 2-chiral links can be approximately equalized.
It's advantageous.

The present invention is not limited to the arrangement of the above-mentioned embodiments, and the present invention is not limited to the arrangement of the embodiments described above.
By varying the arrangement of the bichral link, the location and stiffness of the attachment point to the wheel support member, it is possible to create desirable trends in the camber and toe angle changes of the wheel.

[Brief Description of the Drawings] Fig. 1 is a plan view of an embodiment of the suspension of the present invention;
FIG. 2 is a rear view of an embodiment of the suspension of the present invention, FIG. 3 is a perspective view thereof, FIG. FIG. 7 is a diagram showing changes in toe angle when @ is subjected to vertical force. FIG. 7 is a side view of a suspension according to another embodiment. Explanation of symbols 10...Wheel, 12...Wheel support member, 14...Suspension device, 18...Swing arm, 20...Happy/Lateral link- 22.・・Conflict/No. 1 Chiral Link, 24...-・32nd Chiral Link, 26... Shock absorption, 28... Vehicle main frame. Patent applicant: Toyo Kogyo Co., Ltd. Figure 3 Figure 4 Figure 5

Claims (2)

[Claims] (1) Extends in the longitudinal direction of the vehicle body, one end is attached to the vehicle body so as to be swingable in the vertical direction, and the other end supports the wheel support member and is capable of transmitting force in the longitudinal direction and rotational force in the wheel rotation direction to the wheel support member. and three lateral links extending independently from each other in the lateral direction of the vehicle body, one end of each lateral link being rotatably attached to the wheel support member and the other end rotatably attached to the vehicle body,
The attachment points of the seven lateral links on the wheel support member are arranged above the attachment points of the other two lateral links, and the attachment points of the other two-way link are arranged above the attachment points of the other two lateral links. They are arranged in front and behind a straight line connecting the attachment point and the point of applying lateral force to the wheel, and the attachment point of the lateral link placed on the front side of the two lateral links to the wheel support member is connected to the straight line. An automobile suspension, characterized in that the distance is shorter than the distance between the attachment point of the lateral link arranged on the rear side to the wheel support member and the straight line. (2) The attachment point of the lateral link placed above to the wheel support member is located above and in front of the wheel center, and the lateral link placed on the front side of the other two lateral links is attached to the vehicle Item 1 above, characterized in that the side weir attachment points are located below and in front of the wheel center, and the wheel side attachment points of the rear side lateral link are located below and rear of the wheel center. Automatic 7TJ rear suspension injection.