JP2580956Y2 - Support structure for vehicle rear differential case - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support structure for a rear differential case of a vehicle, and more particularly to an improvement of a support structure having a simple structure and excellent vibration damping characteristics.

[0002]

2. Description of the Related Art FIG. 3 shows an example of a conventional rear differential case support structure. One end of a propeller shaft 13 extending from the front of the vehicle is inserted into a rear differential case 1 disposed in the front-rear direction (left and right in the drawing), and protrudes from left and right side surfaces via a differential gear in the case 1 (only one is shown). The output is transmitted to the axle shaft 14.

In the rear differential case 1, two rear right and left portions are supported by a cross member 72 disposed in the vehicle left and right direction via rear mounts 81 and 82, and one side surface of a front end is connected to a front mount 83. It is supported by another cross member 73 through the intermediary.

[0004] Brackets 4 and 5 are provided on the suspension member 3 extending in the left-right direction of the vehicle at intervals on the left and right.
The base ends 61 and 62 of the lower suspension arm 6 which are divided into two parts are connected to the first and the first ends 51, respectively, and the front ends thereof reach a wheel W mounted on the front end of the axle shaft 14.

[0005]

In the conventional differential case supporting structure, the front end of the case 1 is supported on the cross member 73 by the front mount 83, so that relatively large vibration is applied to the cross member 73. Noise vibration harshness (NVH) may be deteriorated by inputting. Further, since the exclusive cross member 73 is required, the frame structure becomes complicated and the weight increases.

The present invention solves such a problem, and realizes simplification and weight reduction of a frame structure and NV
It is another object of the present invention to provide a support structure for a vehicle rear differential case in which H is also improved.

[0007]

To explain the structure of the present invention, a bracket 4 is provided on a suspension member 3 arranged in the lateral direction of the vehicle, and a support shaft 4 mounted on the bracket 4 is provided.
1, the rear end of the rear differential case 1 is supported by a cross member 72 disposed in the vehicle left-right direction, and one end is fixed to the front end of the rear differential case 1. A differential support member 2 extending in the vehicle front-rear direction is provided, and the distal end thereof is connected to another support shaft 42 provided on the bracket 4.

[0008]

In this configuration, the vibration of the rear differential case 1 is input to the bracket 4 of the cross member 3 via the differential support member 2. However, the suspension member 3 provided with the bracket 4 is usually of a rigid structure, so that the input vibration Does not deteriorate the NVH.

In addition, since the distance from the rear differential case 1 to the suspension member 3 at the support point is sufficient, the intensity of the vibration input to the suspension member 3 is reduced, thereby preventing the deterioration of NVH.

Since there is no need to provide a cross member exclusively for supporting the differential case, the frame structure is simple and lightweight, and the bracket for connecting the differential support member 2 is shared with the bracket 4 for connecting the suspension arm 6. Thus, the installation space and the number of parts can be reduced.

[0011]

In FIG. 1, a rear differential case 1 having the same structure as that of the conventional case described above has mounts 81, 8 having well-known stays 11, 12 protruding at two positions on the left and right sides at the rear end (right end in the figure).
2 is supported on a cross member 72 bridged between the side members 71 (only one is shown), and a wide rear end 21 of the differential support member 2 extending in the vehicle front-rear direction is provided on an upper surface of a front end portion thereof. Is bolted.

A suspension member 3 is disposed in front of the differential case 1 in the vehicle width direction, and brackets 4 and 5 are provided at two places on the left and right sides of the suspension member 3, respectively.
The lower suspension arm 6 reaching the wheel W is bifurcated at the support shafts 41 and 51, which are installed on the base shafts 61 and 62.
Are connected via known anti-vibration bushes. The bracket 5 protrudes forward of the vehicle, while the bracket 4 has a portion provided with a support shaft 41 protrudes rearward of the vehicle, and an arm rotation axis P connecting the support shafts 41 and 51 intersects with the suspension member 3.

As shown in detail in FIG. 2, the bracket 4 is formed by bending a metal plate, and has parallel side walls 43 and 44 projecting obliquely rearward to support the support shaft 41, and one of the side walls. And a side wall 45 facing in parallel with 44. A support shaft 42 is provided between the side walls 44 and 45, and the front end 22 of the differential support member 2 reaching the support shaft 42 from the rear is connected via a known vibration-proof bush.

In this structure, the differential case 1 has a rear end supported by the mounts 81 and 82 and a front end supported by the differential support member 2 and the support shaft 42. The vibration of the differential case 1 is input from the differential support member 2 to the suspension member 3. However, since the suspension member 3 usually has a sufficiently strong structure, the NVH does not deteriorate due to the vibration input from the differential case 1. In this case, since there is a sufficient distance between the front end of the differential case 1 and the suspension member 3, the input vibration intensity to the support shaft 42 (that is, the suspension member 3) is reduced by the principle of leverage, which also deteriorates the NVH. Can be avoided.

Further, only the relatively lightweight and small differential support member 2 is provided, and the conventional cross member 73 (see FIG. 3) dedicated to supporting the differential case is not required, so that the vehicle frame structure is simple and lightweight. Become.

Furthermore, since the bracket for connecting the suspension arm and the bracket for connecting the differential support member are integrated, the number of parts and the labor for mounting are reduced.
It also saves space.

[0017]

As described above, according to the support structure for a vehicle rear differential case according to the present invention, simplification and weight reduction of the frame structure can be realized, and NVH is also improved.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of a support structure showing an embodiment of the present invention.

FIG. 2 is an enlarged plan view of a bracket, and is an enlarged view of a portion A in FIG. 1;

FIG. 3 is a schematic plan view of a support structure showing a conventional example.

[Description of Signs] 1 Rear differential case 2 Differential support member 3 Suspension member 4 Bracket 41, 42 Support shaft 6 Suspension arm 61 Base end 72 Cross member

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B62D 21/02 B62D 21/11

Claims (1)

(57) [Scope of request for utility model registration] 1. A bracket is provided on a suspension member disposed in a vehicle left-right direction, and a base end of a suspension arm is connected to a support shaft provided on the bracket, while a rear end portion of a rear differential case is disposed in a vehicle left-right direction. A differential support member extending in the vehicle front-rear direction with one end fixed to the front end of the rear differential case, and the distal end thereof is connected to another support shaft provided on the bracket. A support structure for a vehicle rear differential case.