JPS6137507A - Car rear suspension device - Google Patents

Abstract

PURPOSE:To prevent torque stair and others from taking place so as to enhance the controllability and stability of a car by setting the hardness in such a manner that the pitching center of a differential gear is positioned around the center of the axle that extends fron a differential case. CONSTITUTION:A device consists of a bracket 10 firmly secured at the front of a differential case, a bracket 11 firmly secured at the center 1c of a suspension mount frame, and an elastic member 2b which connects both the brackets together. The differential case 4 is supported at its front section 4b and rear section 4a through two elastic members 2b and 2c allowing the pitching center of the case 4 to be positioned at a given point as desired by selecting the hardness value K of the above said two elastic members. Simultaneously, the pitching center is to be positioned aroung the center of an axle 7 in such a manner that kb and kc are determined so as to satisfy an equation kbXlb=kcXlc, where lc is the distance between the center of the elastic member 2b and the center of the axle 7, lc is the distance between the center of the elastic member 2c and the center of the axle 7.

Description

[Detailed description of the invention] (Industrial application field) Book y! ! For use in automobile rear suspensions with built-in differentials! ! The present invention relates to ITl, and particularly to a support structure for a differential.

(Prior art) Automobiles equipped with trailing arm type suspension devices usually include a suspension mount I-frame that is disposed laterally on the vehicle body and is supported by the vehicle body at both left and right ends, and the rear A structure is adopted in which trailing arms supporting the wheels are connected in a swingable manner.Also, when such a car is an FR (front engine, rear wheel drive) car, the differential is usually located behind the suspension mount frame. Therefore, in a type of vehicle where the differential is located at the rear of the suspension mount frame, such as an FR vehicle equipped with a trailing 7-arm suspension device, conventionally, the differential is located at the rear of the suspension mount frame. As disclosed, the rear portion of the differential case is supported by the vehicle body via an elastic material, and the front portion thereof is fixed to the intermediate portion of the squirrel mount frame.
゛However, such conventional rear suspension devices
5, the front part of the differential 7 differential case and the middle part of the suspension mount frame are solidly connected, so the vibration of the differential is directly transmitted to the suspension mount frame and trailing arm, causing negative effects on the suspension system. In addition, there is a disadvantage that the disturbance of the differential arrangement 11 is easily transmitted to the vehicle body via the suspension mount frame.

As a way to solve this problem, by connecting the front part of the differential case and the center part of the suspension mount frame through an elastic material, the vibrations of the differential are absorbed by this elastic material and are not transmitted to the 4-nos mount frame. I can think of people who would block it so that it doesn't exist.

On the other hand, the differential case performs a pitching motion, for example, due to wind-up during a sudden start. In this case, if the pitching center of the differential 7 differential case can be located near the center of the axle (drive shaft) extending from the case, the position of the axle will not change even if the differential case makes a pitching motion. This is preferable because torque steer and the like can be prevented.

However, setting the center of the pitching motion of the differential case to be located near the center of the axle is not at all easy as there are actually various υ1 coefficients.

However, as mentioned above, if both the front and rear parts of the differential differential case are configured to be supported via elastic materials, the differential will be mostly supported by both of these elastic materials, and therefore both By appropriately setting the hardness of the elastic material, the pitching center of the differential case can be located at an arbitrary location, and the pitching center can also be located near the center of the axle extending from the differential case. This is convenient because it can be achieved extremely easily simply by appropriately setting the hardness of the material.

Na a3, equity 111j 58-24290 Yumiko 9'fJ
24i, 7" 77 L' The front part of the case is supported via an elastic material by a cross member dedicated to supporting the case. A technology has been disclosed.

However, in this publication, the pitching center of the differential arrangement 11 case is adjusted by appropriately setting the hardness of the elastic material.
171 techniques have been shown that will cause death if placed at the 1st breath position (
not present.

(Objective of the Invention) In view of the above circumstances, the object of the present invention is to isolate the vibration of the differential by connecting the front part of the differential 7 differential case to the central part of the suspension mount frame via an elastic material. By doing so, the vibration of the struck differential is directly transmitted to the suspension system, which is a disadvantage in the case of a conventional fixed connection. In addition to solving the inconvenience that the +J'' suspension system requires maintenance costs or that the vibration of the differential is easily transmitted to the vehicle body, the pitching center of the differential case is located at or near the center of the axle extending from the case. To provide a rear suspension device for an automobile in which the position of the axle does not change even when the case performs a pitching motion.

(Structure of the Invention) In order to achieve the above object, the rear suspension device for an automobile according to the present invention is provided with a suspension mount l disposed in the lateral direction of the vehicle body and to which left and right A7 suspension trailing arms are swingably connected. - A frame is provided, and the rear part of the differential case located at the rear of the frame is connected to the vehicle body via a rear elastic member, and the front part of the cough case λ is connected to the center part of the suspension mount frame via a front elastic member. The pitching center of the differential 7 renial case is located near the center of the axle extending from the case! ! It is characterized in that the hardness of the ly1 portion and the rear elastic material is set so as to satisfy f.

(Embodiments) Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 4 are dimensional drawings of one embodiment of the suspension device according to the present invention, FIG. 1 is a plan view, and FIG. 2 is a front view (as seen from the direction of arrow Ah in FIG. 1). FIG. 3 is a right side view, and FIG. 4 is an enlarged right side view taken from the rV-IV line position in FIG. 1.

As shown in the figure, in this rear suspension device, the vehicle body (&11 direction (arrow C direction);
The suspension mount frame 1 disposed on
The suspension mount frame 1 is attached in a suspended manner to the floor part of the vehicle body (not shown in the figure) via an elastic member 2a, and the left and right trailing arms 3 (the right trailing arm is not shown in the figure) can swing on this suspension mount frame 1. ,! I! On the other hand, a differential case 4 located at the rear of the vehicle body from this suspension mount frame 1 is attached to the vehicle body at its rear part 4a via an elastic material 2C, and the front part 4b of the case is located at the center of the suspension mount frame 1. It is connected to the portion 1C via an elastic member 2b.

The trailing 7-m 3 consists of an arm part 3a connected to the suspension mount frame 1 and a wheel support part 3b that supports the rear wheel W, and the wheel support part 3b is particularly shown in FIG. Like, a damper device? ff6
It is supported by the vehicle body through. The damper @46 is composed of a damper main part 6a and a coil spring part 6b. The axle 7 extending from the differential case 4 has an end 7a to which the rear wheel W is connected.
The trailing arm wheel support section 3b supports the trailing arm wheel support section 3b near the trailing arm wheel support section 3b.

The trailing arm 3 may be a so-called full trailing arm or a semi-trailing arm.

The attachment to the vehicle body via the elastic material 2C applied to the rear portion 4a of the differential case is not a fixed attachment, but an elastic attachment using an elastic material such as rubber having the desired elasticity. For example, a known rubber mount support structure can be adopted. In addition,
In the illustrated embodiment, the rear part 4a of the case is fixed to the differential mount frame 8, and is attached to the vehicle body through elastic members 2C at both left and right ends aa and ab of this frame. It may be attached to the vehicle body via the elastic member U2c, and in that case, it may be attached directly to the vehicle body without using the differential mount frame 8 as described above.

The above differential case m part 4b and suspension mount 1-
The connection with the frame center portion 1c via the elastic material 2b is also
Similarly to the above, instead of a fixed connection, an elastic connection using an elastic material such as rubber may be sufficient, and in the illustrated embodiment, the bracket 1-10 fixedly attached to the differential case 1y1 and the center of the suspension mount frame Part 1C r! It is formed by connecting one bracket 11 with an elastic member 2b. The front part of the differential case is connected to the central part 1c of the squirrel mount frame, but in this case, the central part 1C is the area that extends to a certain extent including the center point in the left and right direction, for example, the squirrel mount frame. This means between the connecting parts of the left and right trailing arms 3 in J3.

The elastic member 2C that supports the rear portion 4a of the differential 7 renial case and the elastic member 2b that supports the front portion 4b are both elastic members 2
The center point (pitting center) of the pitching motion of the differential case 4, which is determined by the relative relationship between the hardnesses of a and 2b, is located near the center of the axle (drive shaft) 7 extending from the case 4. The hardness is set for each.

That is, the differential case 4 has a front portion 4b.
The case 4 is
It is possible to position the pitting center at any location, and in the present invention, the hardness kb of the front elastic member 2b and the hardness kc of the rear elastic member 2c are appropriately determined. As shown in FIG. 4, the center of the front elastic member 2b and the 1i axis 7
The distance from the center of is 5! , b, If the distance between the center of the rear elastic member 2c and the center of the axle 7 is 9Jc, then kbX9
Jb-・kcXI2. kb, k so that c holds true
By setting c and doing 1, the groove is formed so that the center of the beading of the case 4 is located at the center of the width axis 7. .

'l 113, in this embodiment, the central part 1C of the suspension mount frame moves vertically (as indicated by the arrow in FIG. 3, i0 line II9), and The rotational movement centered on the horizontal axis 13 connecting the center of the attachment part to the middle rest on both the left and right ends of the suspension mount frame, as shown by the arrow [
In order to suppress vertical movement (including the above-mentioned pitching movement), the vertical movement suppressing member 5 is applied to the vehicle body. P-tied.

When the intermediate fire part 1C of the suspension mount frame and the differential case #alI4b are connected via the elastic material 2b, the suspension mount frame center part 1C can move up and down more easily than in the case of a conventional fixed connection, and the line center part 1G If it moves up and down, the suspension system becomes unstable and driving stability decreases. The above-mentioned vertical movement restraining member 1-1 is intended to restrict the medium flame rl 1 c so that it is in a certain positional relationship with respect to the vehicle body or within a predetermined range w, 11114M, In the present invention, if necessary,
It is a good idea to set it up as soon as possible.

In this embodiment, one rod is used as the vertical movement suppressing member 5, and the upper end 5a of this rod is rotatably attached to the vehicle body, and the lower end 5b is attached to the suspension mount frame central part 1G with an elastic material 2d. It is rotatably mounted through. To attach the lower end 5b, as shown in FIG. 5, which is a cross-sectional view taken along the line v-v in FIG. 16, the outer 1i18 is fixed to the lower end 5b of the rod, and both the inner and outer cylinders 17 and 18 are connected by an elastic material 2d such as rubber.

The vertical movement restraining member 5 is a member that restricts the central portion 1C to be at a constant position 00 with respect to the vehicle body, for example, the upper and lower ends of the rod are fixed to the vehicle body and the suspension mount frame central portion 1C, or at least one end of the rod is fixed. It is also possible to connect the rods in a rotatable manner, but this is not preferable because the vibrations of the suspension system will be transmitted directly to the car body through this rod. Elastically regulating the positional relationship,
For example, as in this embodiment, at least -h of the upper and lower ends of the rod
It is preferable to form M4 so that they are connected via an elastic material to prevent vibrations of the suspension system from being directly transmitted to the vehicle body.

<K J3, this member 5 is limited to 1" rad as in the embodiment, 1f1, for example, the upper part of the suspension mount frame 1 is low, and is located directly above the frame 1. The sharpener may be a simple elastic material disposed between the two, or it is also possible to use a damper. Moreover, in this embodiment, this vertical movement suppressing member 5 LU differential? Although they are disposed only on the right side of the range cell case 4 (the right side when viewed from the front), they may be disposed on the 1E side or on both the left and right sides. If J is provided only on one side, the torsional rigidity of the suspension mount frame 1 will be different between the left and right sides, and as a result, the suspension characteristics may be different between the left and right sides.To prevent this, it is preferable to arrange J on both sides if possible.

(Effects of the Invention) As described above, in the automobile V-suspension device according to the present invention, the front part of the differential 7 differential case and the central part of the first frame are connected via an elastic material.

Therefore, the vibrations of the differential system and the vibrations of the suspension system can be reduced by this elastic coupling portion, and the inconvenience that the vibrations of the differential system adversely affect the suspension system can be eliminated.

In other words, most of the imaging of each system is absorbed by the elastic material of this elastic connection part and is not transmitted to the other system, so unlike the differential system of the prior art in which both systems are fixedly connected and integrated, It is possible to eliminate inconveniences such as destabilization of the suspension system due to direct transmission of the photographed image to the suspension system, and vibrations of the suspension system caused by road noise etc. are also absorbed by the elastic material. , f muj in ffurncial system? You can prevent being attacked by 1 point.

However, in the present invention, the pitching center of the differential case is determined by the hardness of the elastic materials that support the front and rear parts of the differential case. Since the position is set to be approximately 1 force near the center of the vehicle, even if the differential differential case makes a pitching motion during a sudden start, the position of the center axis extending from the case will not change. Therefore, it is possible to prevent torque steer, etc., and improve steering stability.

[Brief explanation of the drawing]

Figures 1 to 4 are diagrams showing an embodiment of the suspension system according to the present invention. Figure 1 is a plan view, and Figure 2 is a front view (as seen from the direction of the arrow in Figure 1). Fig. 3 is a right side view, Fig. 4 is an enlarged right side view taken from the line IV-IV in Fig. 1, and Fig. 5 is a V-VFAIgi plane view of Fig. 1. 1... Eggplant mount frame 1a, lb... Left and right ends 1C... Medium heat section 2a, 2b, 2c =... Elastic material 3... Trailing arm 4... Differential case 5... Vertical movement suppression member

Claims (1)

[Claims] The suspension mount frame is arranged in the lateral direction of the vehicle body and to which the trailing arms of the left and right rear suspensions are swingably connected, and a differential case is located behind the suspension mount frame. is supported by the vehicle body via a rear elastic member, and its front portion is supported by the suspension mount frame via the front elastic member, and the front elastic member and the rear elastic member are supported by them. A rear suspension device for an automobile, wherein the hardness of the differential case is set so that the pitching center of the differential case is located near the center of an axle extending from the differential case.