JPH02225184A - Suspension device for vehicle - Google Patents

Abstract

PURPOSE:To improve riding comfortability and operation stability by supporting a differential gear case, a tray ring member and lateral links by means of two suspension members on the front and rear sides, and at the same time, placing interveniently an elastic body between each of the suspension members and a car body. CONSTITUTION:The outer end portions of lateral links 2-4 arranged in a car width direction, and the rear end portion of a tray ring member (a swing arm) 5 arranged in a car body front and rear direction, are respectively connected to a carwheel support member supporting a rear wheel 1. Also, a front side suspension member 7 at a front portion upper part as a connection portion side with the propeller shaft 8 of a differential gear case 6 and a rear side suspension member 10 at the rear portion upper part of the differential gear case 6 are respectively arranged to be placed extendingly in the car width direction. And both right and left end portions of these are fitted to the car body through elastic bodies 9, 11. In this instance, the elastic body 9 on the front side is set to be softer than the elastic body 11 on the rear side. Also, an elastic body 14 is interveniently placed between the differential gear case 6 and the rear side suspension member 10.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a suspension device for a vehicle, and particularly to the structure of a subframe that supports a differential case and suspension members.

(Prior art) In general, this type of subframe is, for example,
As disclosed in Japanese Patent No. 59108, it consists of a pair of left and right side members that extend in the longitudinal direction of the vehicle body and whose front and rear ends are respectively attached to the vehicle body via elastic bodies, and a cross member that connects the both side members. Then, this subframe is configured to support the differential case as well as the inner end of the lateral link as a suspension member, the front end of the trailing member, etc., and these members are individually assembled to the vehicle body. This eliminates the need for this to improve ease of assembly.

On the other hand, in vehicle suspension systems, longitudinal force (
The wheels are supported softly so that they can be displaced relatively easily in response to (mainly rearward-facing loads) to improve ride comfort, and the wheels are firmly supported in response to lateral forces (cornering forces) to improve steering stability. That is required. For this reason, conventionally, a soft elastic body is interposed between the trailing member that receives the longitudinal force and the vehicle body side member (subframe, etc.), while a hard elastic body is interposed between the lateral link that receives the lateral force and the vehicle body side member. Interventions have been made.

(Problem to be Solved by the Invention) However, both the trailing member and the lateral link swing up and down with the bump and rebound of the wheel, and when swinging up and down, these members and the vehicle body side member A large torsional force or the like acts on the elastic body interposed between the two. For this reason, the elastic body must have sufficient strength, and the degree of freedom in setting its softness and hardness, that is, setting its stiffness, is extremely limited, so it is difficult to achieve both improved riding comfort and improved handling stability. The reality is that nothing has been done.

The present invention has been made in view of this point, and its purpose is to focus on an elastic body interposed between the subframe and the vehicle body, and to use this elastic body to control the wheels against longitudinal force. The purpose is to sufficiently achieve both improved riding comfort and improved steering stability by being soft and supporting hard against lateral forces.

(Means for Solving the Problem) In order to achieve the above object, the solving means of the present invention includes a front suspension member that supports the front end of the trailing member and the front end of the differential case, and the inner end of the lateral link and the front suspension member that supports the front end of the trailing member and the front end of the differential case. and a rear suspension member that supports the rear end of the differential case.

An elastic body is interposed between the front suspension member and the vehicle body and between the rear suspension member and the vehicle body, and the elastic body between the front suspension member and the vehicle body is interposed between the rear suspension member and the vehicle body. Set it to be softer than the elastic body between the two. Further, an elastic body is also interposed between the rear end portion of the differential case and the rear suspension member.

(Function) With the above configuration, in the present invention, when longitudinal force acts on the wheel, this longitudinal force is supported by the vehicle body via the trailing member and the front suspension member, but the front suspension member and the vehicle body are supported by the longitudinal force. Since the elastic body interposed therebetween is set to be soft, longitudinal displacement of the wheel is allowed, resulting in good riding comfort.

On the other hand, when a lateral force acts on the wheel, this lateral force is supported by the vehicle body via the lateral link and the rear suspension member, but the elastic body interposed between the rear suspension member and the vehicle body Since the wheels are set to be stiff, the wheels are firmly supported without being displaced in the vehicle width direction.
Maneuvering stability is improved.

Moreover, the front and rear suspension members mentioned above do not swing up and down like trailing members or lateral links, but are fixed to the vehicle body in an immovable state, so the elasticity between the suspension members and the vehicle body No large torsional force is applied to the body, and a sufficient degree of freedom in setting the rigidity is ensured, making it possible to effectively achieve both the above-mentioned improvements in ride comfort and handling stability. can.

Furthermore, since an elastic body is also interposed between the rear suspension member and the differential case,
Even though the elastic body between the rear suspension member and the vehicle body is hard, vibrations from the differential case (so-called differential noise) can be prevented from being transmitted to the vehicle body via the rear suspension member.

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

FIG. 1 shows a rear suspension device for a vehicle according to a first embodiment of the present invention, in which 1 is a rear wheel, 2, 3 and 4 are arranged in the vehicle width direction, and lateral links 1 and 5 are arranged in the longitudinal direction of the vehicle body. The swing arm is a disposed trailing member, and the outer ends of the latera rubber links 2 to 4 and the rear end of the swing arm 5 are connected to a wheel support member (not shown) that supports the rear wheel 1. There is.

Reference numeral 6 denotes a differential case housing a differential gear, and 7 denotes a front suspension member extending in the vehicle width direction above the front portion of the differential case 6 on the side where it connects to the propeller shaft 8. Both left and right end portions of the front suspension member 7 are attached to the vehicle body via elastic bodies 9. Reference numeral 10 denotes a rear suspension member disposed above the rear part of the differential case 6 to extend in the vehicle width direction, and both left and right ends of the rear suspension member 10 are attached to the vehicle body via elastic bodies 11 and 11. There is.

The front end of the differential case 6 is attached to a fastening bolt 12 in the center of the front suspension member 7.
At the same time, the front end of the swing arm 5 is connected to and supported via an elastic body 21 so as to be able to swing up and down. On the other hand, each of the lateral links 2 to 4 is provided at the end of the rear suspension member 10.
The inner end portions of each are connected and supported via elastic bodies 22 so as to be vertically swingable. Further, a bracket 13 extending in the vehicle width direction along the rear suspension member 10 is fixed to the rear end of the differential case 6, and both ends of the bracket 13 are connected to the rear suspension through elastic bodies 14. is connected to member 10,
Therefore, the rear end portion of the differential case 6 is supported by the rear suspension member 10.

The elastic body 9 between the front suspension member 7 and the vehicle body is made up of a rubber 9c filled between an inner cylinder 9a and an outer cylinder 9b, and the rubber 9c has hollow parts 9d, 9d. . In addition, the front suspension member 10
Similarly to the elastic body 9, the elastic body 11 between the inner cylinder and the vehicle body is formed by filling a space between the inner cylinder, lla, and the outer cylinder 11b with rubber 11c. However, the elastic body 11 does not have a hollow part like the elastic body 9, and is set to be smaller overall than the elastic body 9. Therefore, the elastic body 9 is
It is set to be softer than that.

Next, the functions and effects of the first embodiment will be explained.

When a rearward external force acts on the rear wheel 1, such as when the rear wheel 1 runs over a road protrusion, this external force is transmitted to the vehicle body via the swing arm 5 and the front suspension member 7, and is supported. Ru. At this time, since the elastic body 14 between the front suspension member 7 and the vehicle body is set to be soft, the elastic deformation of the elastic body 14 easily allows for longitudinal displacement of the rear wheel 1, thereby preventing the vehicle from running over. Shocks are prevented from occurring, and riding comfort can be improved.

On the other hand, when a lateral force (cornering force) acts on the rear wheel 1 during cornering, etc., this lateral force is transmitted to the vehicle body via the lateral links 2 to 4 and the rear suspension member 10, and is supported. Ru. At this time, since the elastic body 11 between the rear suspension member 10 and the vehicle body is set to be hard, the rear wheel 1 is firmly supported without being displaced in the vehicle width direction, thereby improving steering stability. be enhanced.

Moreover, the above two suspension members 7.10
are all fixed immovably to the vehicle body, so the lateral links 2 to 4 or the swing arm that swing up and down are connected to the elastic bodies 9, 11 between the suspension member 7.10 and the vehicle body. 5 and the suspension member 7.10, no large torsional forces act as in the case of the elastic body 21.22. Therefore, there is no particular restriction on the rigidity setting of the elastic bodies 9 and 11 from the viewpoint of strength, and the degree of freedom is large, so it is possible to achieve both the above-mentioned improvement in ride comfort and improvement in handling stability. , can be effectively achieved by appropriately setting the stiffness of each elastic body 9.11.

Furthermore, since the elastic body 14 is also interposed between the rear suspension member 10 and the differential case 6, even if the elastic body 11 between the rear suspension member 10 and the vehicle body is set to be hard, It is possible to prevent differential noise from the differential case 6 from being transmitted to the vehicle body via the rear suspension member 10.

In addition, the sub-frame structure consisting of two front and rear suspension members 7°10 has fewer members and is lighter than the conventional sub-frame structure consisting of a pair of left and right side frames connected by a cross member. can contribute. Moreover, both suspension members 7, 10 are connected by the differential case 6, and together with this, are integrally assembled to the vehicle body, and have the original function of the subframe. That is, a suspension member 7. in which suspension members such as the lateral links 2 to 4 and the swing arm 5 are integrated with the differential case 6.
If the suspension members are attached to the vehicle body and then assembled to the vehicle body, the assembly can be performed more easily and quickly than when the suspension members are individually attached to the vehicle body.

FIG. 2 shows a rear suspension device for a four-wheel steering vehicle according to a second embodiment of the present invention. In this embodiment, the lateral force acting on the rear wheel 1 is caused by two upper and lower lateral links 31.3.
2, the longitudinal force acting on the rear wheel 1 is transmitted to the vehicle body and supported by the two upper and lower trailing links 33 and 34 as trailing members.

That is, the outer ends of both lateral links 31 and 32 are connected to a wheel support member (not shown) that supports the rear wheel 1, and the inner ends are connected to the rear suspension member 1.
0 through elastic bodies 35 so as to be vertically swingable. In addition, both of the trailing links 33.
34 are both connected and supported to the front suspension member 7 via an elastic body 36 so as to be able to swing up and down, and the rear end of the upper trailing link 33 is connected to the upper lateral link 31, and the lower The rear end portions of the trailing links 34 are connected to the lower lateral links 32, respectively.

Further, a rear wheel steering device 38 having a gear box 37 etc. is attached to the rear suspension member 10.
The steering force of the rear wheel steering device 38 is transmitted to the rear wheel 1 side via a tie rod 39. Incidentally, the mounting structure of the two front and rear suspension members 7.10 and other configurations of the suspension device are the same as in the first embodiment, so the same members are given the same reference numerals and their explanations will be omitted.

In the second embodiment, in addition to having the effect of being able to effectively achieve both improvement in ride comfort and improvement in handling stability as in the case of the first embodiment, the rear wheel The steering device 38 is provided to the rear suspension member 10 attached to the vehicle body with a hard elastic body 11 interposed therebetween, and has high support rigidity, thereby preventing fluctuations in the steering angle of the rear wheels 1. It also has the effect of being able to.

(Effects of the Invention) As described above, according to the vehicle suspension device of the present invention, the two front and rear suspension members are used for both the differential case and the trailing link, with an elastic body interposed between each suspension member and the vehicle body. This allows flexibility in setting the rigidity of the elastic body while supporting the wheels softly against longitudinal forces and firmly supporting them against lateral forces, improving ride comfort. It is possible to effectively achieve both improved handling stability and also to prevent differential noise from being transmitted to the vehicle body.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, and FIG. 1 is a plan view of a rear suspension device showing the first embodiment, and FIG.
The figure is a diagram corresponding to FIG. 1 showing the second embodiment. 2 to 4, 31. 32... Lateral link, 5... Swing arm (trailing link), 6... Differential case, 7... Front suspension member, 9.11.14... Elastic body , 10... Rear suspension member, 33.34...
・Trailing link (trailing member).

Claims (1)

[Claims] (1) It includes a front suspension member that supports the front end of the trailing member and the front end of the differential case, and a rear suspension member that supports the inner end of the lateral link and the rear end of the differential case. An elastic body is interposed between the front suspension member and the vehicle body and between the rear suspension member and the vehicle body, and the elastic body between the front suspension member and the vehicle body is interposed between the rear suspension member and the vehicle body. A suspension device for a vehicle, characterized in that the elastic body is set to be softer than the elastic body, and is interposed between the rear end portion of the differential case and the rear suspension member.