JPS6137508A - Car rear suspension device - Google Patents

Abstract

PURPOSE:To restrain a differential case from winding up by positioning the pitching center of a differential gear in front of its center of gravity so as to allow the weight of the differential gear to act as an inertial force. CONSTITUTION:A suspension mount frame is installed in a form of a suspension from the floor of a body of a car at its right and left end points 1a and 1b through an elastic member 2a. While, a differential case 4 which is located in the rear of the frame 1, is installed on the body at its rear point 4a through an elastic member 2c. The hardness value of the elastic member 2c that supports the rear point 4a of the differential case, and the elastic member 2b that supports the front point 4b, is determined in such a manner that the center P of pitching motion of the case 4 which relies on the relative relatiol of the hardness value between both the elastic members 2a and 2b, is positioned in the forward side of the body as much as lo from the center of gravity of the differential gear.

Description

DETAILED DESCRIPTION OF THE INVENTION (II. Field of Industrial Application) The present invention relates to a rear suspension device for an automobile incorporating a differential, and particularly to a support structure for the differential.

(Prior Art) Automobiles equipped with trailing arm suspension devices usually include a suspension mount frame that is disposed laterally across the vehicle body and supported by the vehicle body at both left and right ends.
A structure is adopted in which a trailing arm that supports the rear wheel is swingably connected to this frame. Furthermore, if such a vehicle is an FR (front engine/rear wheel drive) vehicle, the differential gear and the differential are usually located behind the suspension mount frame.

Therefore, for example, a trailing arm suspension
Conventionally, in cars of the type where the differential is located behind the suspension mount frame, such as FR cars with A-type suspension, the differential case has been placed ( The rear part of the suspension is supported by the vehicle body through an elastic material, and the front part is fixed to the center of the suspension mount frame.
-In fact, in such a conventional rear suspension arrangement, the front part of the differential case and the suspension mount 1-
Since the middle heat section of the frame is solidified, the vibration of the differential is directly transmitted to the suspension mount frame and trailing arm →) "It has a negative impact on the suspension system, and the differential There is a disadvantage that the heat is easily transmitted to the vehicle body via the suspension mount frame.

As a method to solve this inconvenience, the front part of the differential case and the center part of the suspension mount frame are connected through an elastic material, so that the elastic material absorbs the iIi% of the farencittle in 1. (There are 172 people who block Nosmountf 1 from being transmitted to Norm.

On the other hand, the differential case, for example,
Pitching motion is performed by wind-up, etc. In this case, if the pitching center of the differential case can be positioned a desired amount forward (!I! forward in the front-back direction of the body) from the center of gravity of the differential,
This is advantageous because the stacking of the differential can be used as a mass, suppressing differential windup and reducing muffled noise caused by differential vibration.

However, setting the center of the pitching movement lI3 of the differential case to be located at the desired position M (in front of the center of gravity) above is not at all easy as there is a ladder rule in reality. 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, the differential will be supported by both elastic materials. By appropriately setting the hard skin, the pitching center of the differential case can be positioned at any desired location, and the pitching center can also be positioned a desired amount forward of the center of gravity of the differential. This is convenient because it can be easily achieved in the first step by simply setting the hardness of both elastic materials appropriately.

Jj, Japanese Patent Publication No. 58-24290 describes a differential arrangement (・ru) in which the front part of the differential 7 renial case is placed in the direction of the vehicle body 1a? A technique is disclosed in which an elastic member is attached to a glue member exclusively for supporting the base through an elastic material.

However, this publication does not disclose a technique for appropriately setting the VJ and degree of the elastic material so as to position the pitching center of the C differential case in the direction of 1) from the center 1.

(Object of the invention) Tree J'! ! The purpose of the system is to isolate the vibrations of the 7-range differential by connecting the front part of the differential range handle case to the central part of the exposed suspension mount frame via an elastic material. As a result, the disadvantages of conventional fixed connections are that the vibration of the differential arrangement 1P is directly transmitted to the suspension system, causing an adverse effect on the suspension system, or that the vibration of the differential is transmitted to the vehicle body. To provide a rear suspension device for an automobile that is positioned further forward and utilizes the weight of a differential as a mass.

(Structure of the Invention) In order to achieve the above object, the automobile carrier pension system according to the present invention is arranged in the lateral direction of the vehicle body, and the left and right trailing arms swing. The vehicle is equipped with a suspension mount frame that can be connected to the suspension mount frame, and the rear part of the differential 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 case is connected via a front elastic member. Connect to the center of the above suspension mount frame,
The hardness of the front elastic member and the rear elastic member is set so that the pitching center of the differential case determined by the hardness is located forward of the center of gravity n of the differential.

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

1 to 1 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 the arrow in FIG. 1). FIG. 3 is a right side view, and FIG. 4 is an enlarged right side view taken from the line IV--IV in FIG.

As shown in the figure, this rear suspension device has J5,
! '1! The suspension mount frame 1 disposed on the resting lateral force body (in the direction of arrow C, arrow F indicates the front of the vehicle body 1J) has elastic members 2a at both left and right ends (including the vicinity of both ends) 1a and Ib. A mounting number is attached in a suspended manner to the floor part of the vehicle body (not shown) through the suspension mount frame 1, and left and right I/railing arms 3 (right trailing arm not shown) are attached to the suspension mount frame 1 with a swinging 8T. On the other hand, the differential case 4 located behind the suspension mount frame 1 is attached to the vehicle body via an elastic material 2C at its rear part 4a, and the front part 4b of the case is connected to the Central portion 1ck of suspension mount frame 1: Connected via elastic material 2b.

The above 1 to railing arm 3 are suspension mount frame 1
It consists of an arm part 3a connected to the rear wheel W, and a wheel support part 3b that supports the rear wheel W.
is supported by the vehicle body via a damper device 6, as particularly shown in FIG. The damper device 6 includes a damper main portion 6a and a coil spring portion 6b.

Car lll extending from the above differential 7 rental case 4
ll17 is therefore supported by the trailing arm wheel support portion 3b in the vicinity of its end 7a connected to the rear wheel Wlfi.

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

Above differential arrangement 1? The attachment to the vehicle body via the elastic material 2C at the rear part 4a of the case is not a fixed arrangement, but an elastic attachment using an elastic material such as rubber that provides the desired elasticity. For example, a known rubber mount support structure can be used. 4
r, in the oral example, case 1 (part 4a is the differential mount 1
~ It is fixed to the frame 8, and is attached to the 14 body through elastic material 2C at two places on both right ends Qa and Qb of this frame, but the rear part 4a of the case is attached at one place through the elastic material 2C. It may be attached to the vehicle body, and in that case, it may be attached directly without going through the differential machine 1 and the frame 8 as described above (1).

Similarly to the above, the connection between the differential shaft front portion 4b and the suspension mount 1-frame center portion 1C via the elastic material 2b is not fixed, but is performed by interposing an elastic material such as rubber. Any elastic connection is sufficient, and in the illustrated embodiment, the bracket 1-10 is fixed to the front part of the denoncial case.
and a fixedly installed bushing 111 of the suspension mount frame are connected by an elastic material 21). In addition, the differential 7 differential case is connected to the center part 1C of the front beam mount frame, but in this case, the center part 1C
This means a range extending to the right of the culm spread including the center point in the left-right direction, for example, between the connecting parts of the left and right trailing arms 3 in the suspension mount frame 1.

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
so that the center point of the pitching movement of the differential case 4 (pitching center) P, which is determined by the relative relationship between the hardnesses of a and 2b, is located toward the front of the vehicle body by a desired distance of ω52,0 from the position of m4JIG of the differential, respectively. The hardness is set.

That is, the differential 7 rental case 4 has a front portion 4b.
By appropriately selecting k-, which is supported via both the elastic members 2b and 2G in the rear part 4a, and therefore corresponds to the stiffness and spring constant of both elastic members, the pitching of the case 4 described in ■- It is possible to position the center at any desired 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 , the distance between the center of the front elastic member 2b and the desired pitching center P position is 9. b, When the distance between the center of the rear elastic member 2C and the desired pitching center P position is Lc, kl)X, Ql)'' kcX 9
By setting kb and kc to (Jc holds true), the biting eyelid interpolation P in case 4 is brought to the center of gravity G and the desired r5'i response is achieved. It is configured to be located only at the front.

<'t I'), J3 in this embodiment (the intermediate heat part 1C of the suspension mount frame moves up and down in the center part 1C (arrow 1 in FIG. 3)). Indicated by the arrow in Figure 3, Mr. 1J, Suspension Mount 1 - Rotary up and down movement centered on the horizontal @ 13 connecting the centers of the attachment points of both left and right frames to the vehicle body, and the above-mentioned pitching movement. including)
In order to suppress this, a vertical movement suppressing member 5 is connected to the vehicle body.

By connecting the central part 1C of the squirrel mount frame and the differential case rfE7fi4b via the elastic material 2b, the central part 1C of the squirrel mount frame can move up and down more easily than in the case of a conventional fixed connection. If the medium heat section 1c continues to move up and down, the suspension system becomes unstable and running stability deteriorates. The above-mentioned vertical movement restraining member 5 is intended to restrict the central portion 1C to be in a fixed positional relationship or a positional relationship within a predetermined range with respect to the vehicle body, and is necessary in the present invention. It is a good idea to set it up accordingly.

In this embodiment, a single 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 elastically attached to the suspension mount frame central portion 1C. It is rotatably attached via the material 2d. The attachment of the lower end 5b is as shown in Figure 1.
As shown in FIG. 5, which is a plan view, the outer tube 18 is attached to the suspension mount frame, and the inner and outer tubes 1117 and 18 are connected by an elastic member 412d made of rubber or the like.

hsal: The immobility suppressing member 5 is a member that restricts the central portion 1c to have a fixed positional relationship with respect to the weight 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 thereof is fixed. It is also possible to connect the rods in a rotatable manner, but this is not preferable because vibrations from the respension system will be transmitted directly to the car body via this rod. For example, as in this embodiment, at least one of the upper and lower ends of the rod is connected via an elastic material, and the eggplant pension type It is preferable to prevent vibrations from being transmitted directly to the vehicle body.

(7) This vertical movement restraining member 5 is not limited to the 1st part as in the embodiment, for example, it is located between the suspension mount frame 1. [1a is low and is located directly above the frame 1. It is also possible to use an elastic material i and C provided between the two, and it is also possible to use a damper. In addition, in the case of 114 tree nuts, this vertical movement +111 it, II
Bugetsu 5 is a differential arrangement 1! Although it is installed only on the right side of the suspension case 4 (the right side when viewed from the first side), it can be installed on the left side or on both the left and right sides. The torsional rigidity of the frame 1 will be 5? on the left side, and as a result, there is a possibility that the eggplant characteristics will be different between the left and right sides.To avoid this, it is preferable to arrange the frame on both sides if possible.

(Effects of the Invention) In the rear suspension mounting for an automobile according to the present invention, as described above, the front part of the differential case and the central part of the suspension mount frame are connected through an elastic material.

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

In other words, most of the vibrations in each system are absorbed by the elastic material of this elastic connection part and are not transmitted to the other system. It is possible to eliminate inconveniences such as vibrations being directly transmitted to the suspension system and destabilizing the suspension system, and also to prevent vibrations in the suspension system caused by road noise, etc. FJJ t) Ji
"IL": It is possible to prevent ILν from being absorbed by the second bullet member and being transmitted to the differential arrangement system.

In the present invention, the hardness of the elastic members supporting the front and rear parts of the differential case is set so that the pitching center of the differential case, which is determined by the elastic members, is located forward of the center of gravity of the differential arrangement cell. It consists of Therefore, differential 7, range 1! It is possible to use the fO of Le as a mass, and as a result, the following effects can be obtained.

In other words, change the pitching center of the differential arrangement cell to
When positioned in front of the center of gravity of the range torque, the weight E of the differential moves in wind-up and inner wind-up motions, thereby suppressing wind-up of the differential. Also, the differential ff! If the river can be used as a mass for a dynamic damper and the high-frequency vibrations of the differential case can be suppressed, the resonance frequency can be lowered significantly, making it possible to reduce crowding.

[Brief explanation of drawings]

1 to 4 are open views of an embodiment of the suspension device according to the present invention, FIG. 1 is a plan view, and FIG. 2 is a front view (a view seen from the six directions of arrows in FIG. 1). , FIG. 3 is a side view, FIG. 4 is an enlarged right side view taken from the line IV--IV in FIG. 1, and FIG. 5 is a cross-sectional view taken along line V--V in FIG. 1... Suspension mount 1 - Frame 1a, lb... Both left and right ends 1C... Center part 2a, 2b, 2c - fW property u3...]・Railing arm 4...Differential arrangement cell case 5・・Vertical movement suppression member

Claims (1)

[Claims] The differential case includes a suspension mount frame that 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 that is located behind the suspension mount frame. Its rear part is supported by the vehicle body via a rear elastic member, and its front part is supported by the suspension mount frame via a front elastic member, and the front elastic member and the rear elastic member are A rear suspension device for an automobile, characterized in that its stiffness is set so that a pitching center of the supported differential case is located forward of a center of gravity of the differential.