JPS6144011A - Rear suspension system of car - Google Patents

Abstract

PURPOSE:To generate a couple which offsets a couple acting on a differential case at the time of rapid acceleration and prevent a squat phenomenon by placing the front end of a rear suspension arm in an upper position than the center of a suspension mount frame supporting part. CONSTITUTION:At the time of rapid acceleration as in the case of starting a car, etc., a couple in the opposite direction to the rotating direction of a rear wheel 6, acts on a differential case as the reaction force to the driving force of an engine which is transmitted from the differential gears in said case to the rear wheel 6. And, axial force which is directed from a wheel supporting member 5 side to an arm member 4b side, acts on a rear suspension arm 3 due to the driving force of the rear wheel 6. In this case, the front end part of the arm member 4b of the arm 3 on the outside of the car body, is connected to a mounting bracket 17 provided on the end part of the suspension mount frame 1, in an upper position than the center P of the supporting part 2 of the frame 1. Thereby a couple in the same direction as the rotating direction of the rear wheel 6 is generated in the frame 1 due to the axial force of the arm 3.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a rear suspension device installed in an FR (front engine/rear drive) type automobile.

(Prior art) Conventionally, this type of automobile glue A7't Subensimi/v
41HIT, for example, as disclosed in Utility Model No. 11 (50-15288%), a suspension mount frame arranged in the vehicle width direction and supported near both ends by the vehicle body, and a A pair of left and right rear suspension arms are arranged in the longitudinal direction of the vehicle, the front ends of which are rotatably connected to the suspension mount frame, and the rear ends of which support the rear wheels.
It is known that the vehicle includes a differential 7/renial case, the front part of which is supported near the center of the suspension mount frame, and the rear part of which is supported by the vehicle body.

(Problems to be Solved by the Invention) Conventionally, when an FR type vehicle accelerates rapidly such as when starting, the differential case acts as a reaction force of the driving force transmitted from the differential device in the differential case to the rear wheels. When a large force couple acts in the direction opposite to the direction of rotation of the rear wheels, a so-called scott phenomenon occurs in which the rear side of the vehicle body slowly sinks, resulting in a problem in which safety, acceleration, etc. are impaired. For this reason, there is a need for a means to prevent the occurrence of the Skott phenomenon, but at present no one has yet been proposed that satisfactorily meets this demand.

In view of the above, the present invention provides a rear suspension device for an automobile that includes a suspension mount frame, a rear suspension arm, and a differential case as described above. The purpose of this invention is to focus on the fact that an axial force is generated from the rear end of the barrel toward the front end, and to utilize this axial force to prevent the occurrence of the Skott phenomenon.

(Means for Solving the Problems) In order to achieve the above object, the solution means of the present invention includes a suspension mount frame arranged in the vehicle width direction and supported on the vehicle body by support portions near both ends; A pair of left and right rear suspension arms that are arranged approximately in the front-rear direction of the vehicle at the rear of the end of the frame and support the rear wheels at their rear ends;
A differential device is built in to transmit driving force to the rear wheels, and the front part is supported near the center of the above-mentioned suspension mount frame, and the rear part is supported by the vehicle body.The differential case is installed at both ends of the above-mentioned suspension mount frame. A mounting bracket is provided and extends upward, and the front end of each of the rear suspension arms is connected to the mounting bracket at a position above the center of the suspension mount frame support portion.

(Function) With the above configuration, in the present invention, during sudden acceleration, the forward axial force acting on the rear suspension arm generates a couple force in the same direction as the rotational direction of the rear wheel at the center of the support part of the suspension mount frame. This couple and the couple acting on the differential case cancel each other out to prevent the Skott phenomenon from occurring.

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

1 and 2 show an FR type rear suspension device for a moving vehicle as an embodiment of the present invention, in which reference numeral 1 denotes a suspension mount frame arranged in the vehicle width direction, and both ends of the suspension mount frame 1 are shown in FIG. The parts are respectively a rubber member 2,
2 is elastically supported by a main frame (not shown) which is a strength member of the vehicle body, and each of the rubber members 2 has an elastic body 2c such as rubber filled and fixed between the inner tube 2a and the outer tube 2b. It will be done. 3.3 is the above suspension mount frame 1
A pair of left and right rear suspension arms are disposed substantially in the longitudinal direction of the vehicle body at the rear of both ends thereof, and each rear suspension arm 3 connects two arm members 4a and 4b and a wheel support member 5 in the front and back. The rear wheel 6 is formed into a bifurcated shape, and the rear wheel 6 is rotatably supported by the wheel support member 5.

Reference numeral 7 denotes a differential 71 differential case disposed at the rear of the central portion of the suspension mount frame 1, and inside the differential case 7, an engine is inputted via a pump (not shown). A differential device is provided for transmitting driving force to the left and right rear wheels 6, 6 via the drive shaft.

A cross member 8 extending in the vehicle width direction is connected to the rear upper surface of the differential case 7 at its longitudinal center, and both ends of the cross member 8 are attached to the vehicle body via rubber members 9 and 9. Elastically supported by the main frame. Each of the above-mentioned rubber members 9, like the above-mentioned rubber member 2 for elastically supporting the suspension mount frame 1 on the main frame, is made by filling and fixing an elastic body 9C between the inner cylinder 9a and the outer cylinder 1!19b. Become. Further, the front portion of the differential armature case 7 extends above the central portion of the suspension mount frame 1 and is connected to the suspension mount frame 1 via a rubber member 10.

The rubber member 10 is attached to a case bracket 11 attached to one side of the front part of the differential case 7 (on the left side of the vehicle body in the figure) and to the center of the suspension mount i-frame 1. The frame brackets 12 face each other with a predetermined gap in the width direction, and each bracket 1 has both end surfaces between the above-mentioned both brackets 11 and 12.
1.12 and an elastic body 13 made of rubber or the like, which elastically supports the front part of the differential case 7 on the suspension mount frame 1.

On the other hand, an extending portion 14 is formed in the center of the suspension mount frame 1 and extends rearward from the frame bracket 12 attachment portion along the sides of the differential case 7. A link member 15 extending in the vertical direction is arranged near the tip. The link member 15 has its lower end connected to the tip of the extension part 14 and its upper end connected to the vehicle body through elastic bushings i5a and 16b, respectively, and is capable of rotational displacement around an axis connecting both ends of the suspension mount frame 1. We are trying to regulate.

As a feature of the present invention, each of the suspension mount frames 1 is provided at both ends of the suspension mount frame 1.
Mounting bracket 17.17 extending upwardly from the rear side
is installed. Further, the front end portion of the arm member 4a on the inside of the vehicle body of each of the rear suspension arms 3 is connected to the suspension mount frame 1 by a rubber member 2 serving as its support portion.
The arm member 4b on the outside of the vehicle body is rotatably connected via a support shaft 18a at approximately the same height as the center P of the
The front end portion of is rotatably connected to the mounting bracket 17 at a position above the center P of the rubber member 2 via a support shaft 18b.

Next, to explain the effects of the above embodiment, during sudden acceleration such as when starting, the reaction of the engine driving force is transmitted from the differential device in the differential case 7 to the rear wheels 6 via the dry shaft 11. A force couple acts on the differential case 7 around the drive shaft in the direction opposite to the rotational direction of the rear wheels 6, and an external force (driving force/progressive force) acting in the forward direction of the vehicle body acts between the rear wheels 6 and the ground contact surface. As a result, the rear suspension arm 3 is moved from the wheel support part U5 side <W end side) to the arm parts 444a, 4b side (
An axial force is applied toward the front end (front end side).

In this case, the front end of the arm member 4b on the outside of the vehicle body of the rear suspension arm 3 is connected to the suspension mount frame 1.
Since it is connected to the mounting bracket 17 provided at the end at a position above the center P of the support part (rubber member 2) of the suspension mount frame 1, the mounting bracket 17 is attached to the arm due to the axial force of the rear suspension arm 3. A couple is generated in the suspension mount frame 1 as a member around the center P of its support portion in the same direction as the rotational direction of the rear wheel. As this couple cancels out the couple acting on the differential case 7 as described above, it is possible to prevent the occurrence of the scott phenomenon caused by the couple acting on the differential case 7, thereby improving safety. It is possible to improve acceleration performance and the like.

Moreover, the structure of the rear suspension device in the above embodiment is such that, compared to the conventional structure, a mounting bracket 17 that extends upward is simply provided at the end of the suspension mount frame 1, and the end of the mounting bracket 17 is attached to the arm of the rear suspension arm 3 on the outside of the vehicle body. The first embodiment is simple in that it only connects the front ends of the members 4b, and is advantageous in terms of implementation, such as being inexpensive and easy to implement.

It should be noted that the present invention is not limited to the above embodiments, but includes various other modifications.

For example, in the above embodiment, the present invention is implemented as the V suspension arm 3, which includes two arm portions U4a.

4b and a wheel support member 5, the case where the rear suspension device is applied to a rear suspension device using a bifurcated structure consisting of the arm member 4b and the wheel support member 5 has been described. Of course, the present invention can also be applied to the rear suspension device of.

(Effects of the Invention) As described above, according to the rear suspension device for an automobile according to the present invention, a mounting bracket extending upward is provided at the end of the suspension mount frame, and the front end of the rear suspension arm is connected to the mounting bracket. With a simple structure that connects the rear suspension arm at a position above the center of the suspension mount frame support, when driving at a sudden acceleration such as when starting, the axial force of the rear suspension arm allows the differential to be connected to the center of the suspension mount frame support. Since it is possible to generate a force couple that cancels out the couple acting on the case, it is possible to reliably and effectively prevent the occurrence of the Skott phenomenon, and it is possible to improve safety, acceleration, etc.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a plan view;
FIG. 2 is a schematic side view. 1... Suspension mount frame, 2... Rubber part (
Support part>, 3... Rear suspension arm, 6...
・Rear wheel, 7...Differential case, 17...
Mounting bracket, P...Center of the rubber part.

Claims (1)

[Claims] (1) A suspension mount frame that is arranged in the vehicle width direction and supported by the vehicle body at support parts near both ends, and a suspension mount frame that is arranged approximately in the longitudinal direction of the vehicle body at the rear of the end of the suspension mount frame and supports the rear wheel at the rear end. It has a pair of left and right rear suspension arms to support it, and a built-in differential device to transmit driving force to the rear wheels.The front part is supported near the center of the suspension mount frame, and the rear part is supported by the vehicle body. and mounting brackets that are provided at both ends of the suspension mount frame and extend upward, and the front ends of each of the rear suspension arms are connected to the mounting brackets at positions above the center of the suspension mount frame support. An automobile rear suspension device characterized by: