JP2599189Y2 - Mounting structure of differential device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure in which a differential device of an automobile is elastically supported on a vehicle body via a cylindrical bush. More specifically, the weight of the mounting portion of the differential device is reduced to reduce vibration. The present invention relates to an improvement in a support structure capable of reducing the generation of noise and reducing the number of parts to reduce costs.

[0002]

2. Description of the Related Art A differential device absorbs a difference between left and right rotations when transmitting engine power to left and right wheels via a drive shaft. When the differential device is mounted on a vehicle body, the weight of the mount portion is reduced and the rigidity is increased to suppress the generation of noise due to vibration and the like. As an example of such a mounting structure, conventionally, for example,
No. 73427 and Japanese Utility Model Application Laid-Open No. 63-88530, which have the structure shown in FIG. A mounting member 32 extending in the vehicle width direction is fixed to a front portion 31a of the differential device 31 in the vehicle front-rear direction, and U-shaped brackets 33 are fixed to both ends of the mounting member 32. And elastically supported on the left and right side panels 35 through the. A bracket 33 is fixed to a rear portion 31b of the differential device 31, and the bracket 33 is elastically supported on a suspension member 36 via a cylindrical bush 34.

Each of the cylindrical bushes 34 has an inner cylinder inserted into an outer cylinder 37 via a rubber bush, and a bolt 38 is attached to the inner cylinder.
The bracket 33 is fixedly fastened to both ends of each bolt 38, and the outer cylinders 37 are fixed to the vehicle body. According to this structure, the differential device is supported at two points at the front and two points at the rear, so that the weight can be reduced as much as the number of mounts can be reduced as compared with a device supporting four points, and each cylindrical bushing can be reduced. The bolts are supported on both sides by brackets, so the rigidity of the mount can be improved.

[0004]

However, in the above-described conventional mounting structure, a bracket is attached to each mounting portion on the differential device side, and the bracket supports the bolts of the cylindrical bush at both ends.
There is a problem that the unsprung load is increased by the amount of the bracket, and noise due to vibration is easily generated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional situation, and has as its object to provide a mounting structure of a differential device which can reduce the weight of the mounting portion on the differential device side and further suppress the generation of noise due to vibration. The purpose is.

[0006]

According to the present invention, a left and right ends of a mounting member attached to one end in the front-rear direction of the differential device and extending in the vehicle width direction, and a front and rear end attached to the other end in the front-rear direction of the differential device. In the mounting structure of the differential device, the end portion of the mount member extending in the direction is elastically supported on the vehicle body through a cylindrical bush formed by inserting the inner cylinder with an elastic member interposed in the outer cylinder. Support shafts are protruded at the left and right ends of the mounting member and at the ends of the mounting member at the other end,
Each of the support shafts is inserted and fixed in each of the inner cylinders, and the differential device is supported by an inner cylinder cantilevered support in which the outer cylinders are fixed to a vehicle body.

[0007]

According to the mounting structure of the differential device according to the present invention, support shafts are protruded from the left, right and end portions of the mount member, and each of the support shafts is inserted and fixed in the inner cylinder of the cylindrical bush. Since the differential device is supported by the inner cylinder cantilever support with the outer cylinder fixed to the vehicle body, it is possible to eliminate the need for the conventional double-support bracket while securing the support rigidity of the mount. When the span is the same as that of the support, the entire mount member can be reduced in size, and the weight of the mount portion can be reduced correspondingly. As a result, the unsprung load can be reduced.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 to 7 are views illustrating a mounting structure of a differential device according to an embodiment of the present invention. In this embodiment, an example in which the present invention is applied to a rear differential device of a four-wheel drive vehicle will be described.

In FIG. 1, reference numeral 1 denotes a rear differential device to which the mounting structure of the present embodiment is applied. This differential device 1 is a suspension member 2 extending in the vehicle width direction.
And is supported by the member 2. The suspension member 2 is fixed by bridging both ends thereof to left and right side members (not shown), and a mounting bracket 2a projecting rearward is welded to the center of the member 2.

The differential device 1 includes a plurality of differential gears meshed and housed in a differential carrier 1a.
A propeller shaft (not shown) is provided at the front end of the vehicle body in the front-rear direction, and left and right drive shafts 3a and 3b are provided at left and right portions.
Are connected to each other, and rear wheels are attached to outer ends of the left and right drive shafts 3a and 3b. The differential device 1 transmits engine power from a propeller shaft to both rear wheels via drive shafts 3a and 3b, and absorbs a rotation difference between the two rear wheels.

A mounting member 4 having a closed cross section extending in the vehicle width direction is connected and fixed to the upper surface of a front end portion 1b of the vehicle body of the differential device 1, and both ends of the mounting member 4 are connected to each other via a front cylindrical bush 5 as described above. It is supported by the suspension member 2. A mounting bracket 6 is fixed to the rear end face 1c of the differential device 1 by bolts. The rear end of the bracket 6 is supported by the suspension member 2 via a rear cylindrical bush 25. Each of the cylindrical bushes 5 and 25 has an inner cylinder 9 inserted and fixed in the outer cylinder 7 via a rubber bush 8, and the outer and inner cylinders 7 and 9 can relatively swing.

The front cylindrical bush 5 on the mount member 4 side
Attachment portions 10 are welded to the outer cylinder 7, and both attachment portions 10 are fixed to the front end surface of the suspension member 2 with bolts (see FIGS. 3 and 4). Also, the outer cylinder 7 of the rear cylindrical bush 25 on the mounting bracket 6 side
A U-shaped mounting plate 11 is welded to the left and right sides of the suspension member 2. The mounting plate 11 is bolted and fixed to a mounting bracket 2a of the suspension member 2 (see FIGS. 5 and 6).

Support shafts 12, 12 projecting outward in the vehicle width direction are welded to the left and right ends of the mount member 4, respectively. At the base of the support shaft 12, a boss portion 12 a that is in contact with the end surface of the inner cylinder 9 is formed.
A male screw is formed at the tip of the. A support shaft 12 projecting rearward of the vehicle body is provided at the rear end of the mounting bracket 6.
Are welded, and the base of the support shaft 12 has a boss 1
2a is formed with a male screw at the tip.

Each of the support shafts 12 is provided with a cylindrical bush 5, 2.
The boss 12 a of the support shaft 12 is in contact with the end face of the inner cylinder 9. Each support shaft 1
A nut 15 is screwed into the end of the support shaft 2 via a washer 14, whereby each of the support shafts 12 is fastened and fixed to the inner cylinder 9. As a result, the differential device 1 is elastically supported by the suspension member 2 at two points at the front and two points at the rear.

Next, the operation and effect of this embodiment will be described. According to the mounting structure of the present embodiment, the support shafts 12 are welded to both ends of the mount member 4 of the differential device 1 and the rear portion of the mounting bracket 6, respectively, and these support shafts 12 are connected to the inner cylinders of the cylindrical bushes 5 and 25. 9, the differential device 1 is supported by the inner cylinder 9 in a cantilever manner, so that the rigidity of the mounting portion can be ensured, and the conventional bracket supported by the both ends can be eliminated. As a result, the weight of the mount part can be reduced by the amount that the bracket is unnecessary, so that the unsprung weight can be reduced, so that the generation of noise due to vibration can be further suppressed, and further, the cost can be reduced because the bracket is unnecessary. Can be reduced. In addition, since the differential device 1 is supported in a cantilever manner, as shown in FIG. 1, when the span of the two cylindrical bushes 5 and 5 is the same as the conventional span in the case of supporting in both ends (reference numeral in FIG. 9). 34, 34), the entire mount member 4 can be reduced in size, and in this regard, the unsprung weight can be reduced.

FIG. 8 is a characteristic diagram showing the relationship between the vehicle speed and the sound pressure level, which was performed to confirm the effect of the mount structure of the present embodiment, and measures the muffled sound of the front seat during acceleration. I went. In the figure, the broken line shows the characteristics of the conventional structure, and the solid line shows the characteristics of the structure of the present embodiment. As can be seen from the drawing, the sound pressure level at the vehicle speed of 40 to 100 km / h is 4 to 10 d in the structure of the present embodiment as compared with the conventional structure.
It can be seen that B can be reduced and the effect of suppressing noise is obtained.

[0017]

As described above, according to the mounting structure of the differential device according to the present invention, the outer cylinder of each cylindrical bush is fixed to the vehicle body side, and the inner cylinder is inserted into the outer cylinder via the elastic bush. Since each support shaft of the differential device is inserted and fixed to the cylinder and cantilevered, the bracket for double support can be eliminated, the mount member can be downsized, the unsprung load can be reduced, and vibration can be reduced. There is an effect that generation of noise can be reduced, and the number of parts can be reduced to reduce costs.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram illustrating a mounting structure of a differential device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a state where the differential device of the embodiment is mounted on a suspension member.

FIG. 3 is a front view showing a cylindrical bush of the mount member of the embodiment.

FIG. 4 is a sectional side view of the cylindrical bush of the embodiment.

FIG. 5 is a plan view of a mounting bracket of the suspension member of the embodiment.

FIG. 6 is a rear view of the mounting bracket of the embodiment.

FIG. 7 is a perspective view of the differential device of the embodiment.

FIG. 8 is a characteristic diagram showing the effect of the structure of the embodiment.

FIG. 9 is a schematic configuration diagram showing a conventional mount structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Differential device 1b Front end of differential device 1c Rear end of differential device 2 Suspension member (vehicle body) 4 Mounting member 5, 25 Cylindrical bush 7 Outer cylinder 8 Rubber bush 9 Inner cylinder 12 Support shaft

Claims (1)

(57) [Scope of request for utility model registration] 1. One end in the front-rear direction of a differential device
Left mount member extending mounted vehicle width direction to part, and the right end portion, in the longitudinal direction end portions of the differential unit
The end of the mounting member that is attached and extends in the front-rear direction ,
Do not insert the inner cylinder with an elastic member
That the mounting structure of a differential device for resiliently supporting the vehicle body via a cylindrical bush, the end portion Ma
The left and right ends of the und member and the mounting part at the other end
A support shaft is protruded from the end of the material, and each support shaft is inserted and fixed to each of the inner cylinders, and each of the outer cylinders is fixed to the vehicle body.
The above differential device is supported by the inner cylinder cantilever support.
A mounting structure for a differential device characterized by being supported .