JP3365172B2 - Support structure of rear differential case of vehicle - 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 a rear differential case support provided with a pair of left and right center members for extending the front and rear cross members for supporting the rear differential case. Regarding the structure.

[0002]

2. Description of the Related Art FIGS. 5 and 6 schematically show a typical example of a conventional rear differential case support portion structure. As shown in FIG. 5, a rear differential case 1 arranged in the front-rear direction (left and right in the figure) of the vehicle.
, One end of the propeller shaft 13 extending from the front is inserted, and the output is transmitted to the axle shaft 14 protruding from the left and right side surfaces through the differential gear built in the rear differential case 1, and the wheel W at the tip of the axle shaft 14 is driven. Excuse me.

A pair of front and rear cross members 4A and 4B are provided between the left and right side members 3A and 3B. A rear differential case 1 is arranged in the vehicle front-rear direction between a front cross member 4A and a rear cross member 4B, and a front end 11 thereof is supported by the front cross member 4A via a differential support member 6. A stay 7 extending in the vehicle width direction is fixed to the rear end 12, and the left and right ends of the stay 7 are mounted on the lower surface of the rear cross member 4B to the differential mount 5 (FIG. 4).
Supported through. The differential mount 5 is shown in FIGS.
As shown in FIG. 5, it is fastened and fixed to the reinforcement 8 which is a reinforcing member provided on the cross member 4B.

On the left and right sides of the rear differential case 1, there are provided a pair of center members 2C and 2D extending between the front and rear cross members 4A and 4B in an eight-character shape in which the distance between them extends toward the rear side. The center member 2C has a shape gently curved from the front end to the rear end, and the front end is fixed near the supporting portion of the differential support member 6 of the front cross member 4A. On the other hand, the rear end is fixed to a position outside the differential mount 5 provided on the rear cross member 4B.
That is, as shown in FIG. 6, the rear end edge of the center member 2C is fixed to the front surface of the cross member 4B located outside the differential mount attachment portion of the rear cross member 4B. Further, the center member 2D is similar to the center member 2C and has a symmetrical structure.

[0005]

SUMMARY OF THE INVENTION In the above conventional structure,
Due to an input load in the front-rear direction applied from the rear differential case 1 to the differential mount 5, the cross member 4B may be deformed in cross section and the center members 2C and 2D may be bent and deformed. When such deformation occurs, vehicle noise,
Vibration (NV) performance is reduced.

[0006] Therefore, the present invention has been made to solve the problems to prevent the occurrence of deformation and improve the noise and vibration (NV) performance of the vehicle by making the supporting portion of the rear differential case to have a simple structure and high strength. is there.

[0007]

The present invention, as shown in FIGS. 1, 2 and 3, includes left and right side members 3 of a vehicle.
The rear differential case 1 is arranged between the front and rear cross members 4A and 4B installed between A and 3B, and the front end 11 of the rear differential case 1 is supported by the front cross member 4A by the differential support member 6 extending forward from the front end. At the same time, the rear end 12 is supported on the rear cross member 4B through the differential mount 5 by the stay 7 extending from the rear end to the left and right, and the front and rear cross members 4A and 4B are provided on both left and right sides of the rear differential case 1. In the support portion structure of the rear differential case 1 provided with a pair of center members 2A and 2B that extend over the center members 2A and 2B, the center members 2A and 2B are linearly provided in the vehicle front-rear direction, and the rear ends of the center members 2A and 2B are provided.
It is connected to the rear cross member 4B at a position where the center of B coincides with the center of each diff mount 5.

The rear cross member 4B is provided with a reinforcement 8 which reinforces a mounting portion to the differential mount 5, and the rear ends of the center members 2A and 2B are integrally formed with the reinforcement 8 to the rear cross member. Fix to 4B.

Since the center members 2A, 2B are provided linearly in the front-rear direction of the vehicle , the center members 2A, 2B are
Since it receives the longitudinal vibration transmitted from the rear differential case 1 to the cross member 4B in the axial direction, no bending occurs. Also, the linear center members 2A, 2B
Since the center of the cross member is directly connected to the vibration input point from the rear differential case 1 of the cross member 4B, the rigidity of the cross member 4B against vibration in the front-rear direction can be effectively improved. Further , the center members 2A and 2B can maintain sufficient strength even if the plate thickness thereof is thinned, which is advantageous in terms of weight and cost.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIG. 1, a pair of cross members 4 extending between left and right side members 3A and 3B.
A rear differential case 1 having the same structure as the conventional one already described is arranged between A and 4B in the front-rear direction of the vehicle. The rear end of the rear differential case 1 is fixed to the rear end of the differential support member 6 extending forward. The tip of the differential support member 6 is connected to a bracket 43 provided on the front cross member 4A via a vibration isolator. On the other hand, at the rear end 12 of the rear differential case 1, the cross member 4B is provided.
A stay 7 extending in the vehicle width direction is fixed, and both ends of the stay 7 are supported on the lower surface of the cross member 4B via a differential mount 5. In the figure, 14 is an axle shaft, and W is a wheel.

The cross member 4A is provided with a stay 4 on the outer side of the bracket 43 provided on the lower surface thereof so as to be adjacent to the bracket 43.
4A is provided. Further, a stay 44B is provided on the lower surface of the cross member 4A at a position symmetrical to the stay 44A via the propeller shaft 13. The stays 44A and 44B support a suspension arm (not shown), and the front ends of a pair of center members 2A and 2B arranged on both left and right sides of the rear differential case 1 are joined to these. Center member 2
The front ends of A and 2B are slightly bent so as to correspond to the stays 44A and 44B, but are substantially linear, and are parallel to each other along the inside of the left and right side members 3A and 3B. The rear end is connected to the rear cross member 4B.

The connecting structure of the rear end of the center member 2A and the cross member 4B will be described with reference to FIGS. As shown in FIGS. 2A and 2B, the cross member 4
B has a U-shaped cross section, and outwardly corrugated flanges 47 are formed on the upper edges of the front and rear side surfaces 45, 46. Also,
A hole 49 is formed on the bottom surface 48 of the cross member 4B, and a reinforcement 8 is provided at a position corresponding to the hole 49 inside the cross section. Reinforcement 8
Is the tube nut 8 in the standing direction that communicates with the hole 49.
1 has a structure in which a bottom panel 82 to which the lower end of 1 is fixed, and a top panel 83 having a trapezoidal cross section to which the upper end of the tube nut 81 is fixed are coupled. As shown in FIG. 2B, the reinforcement 8 has its bottom panel 82 welded and fixed to the bottom surface 48 of the cross member 4B, and the flange 84 on the side surface of the top panel 83 is attached to the front and rear side surfaces 45, 46 of the cross member. It is welded and fixed inside.

The center member 2A has a U-shaped cross section, and the left and right side surfaces 21 and 22 of the center member 2A have outwardly formed flanges 2 at the rear end edges thereof.
3 is formed, and the bottom surface 24 is also formed with a flange 25 projecting rearward. Then, as shown in FIGS. 2 (B) and 3, the rear end of the center member 2A is arranged at a position where the center of the cross section of the linear center member 2A and the central axis of the tube nut 81 match. Flange 23
Are brought into contact with the front side surface 45 of the cross member 4B, and the flange 25 is brought into contact with the bottom surface 48, and they are fixed by welding. The flange 25 has a triple-structure welded connection in which the bottom panel 82 of the reinforcement 8 and the bottom surface 48 of the cross member 4B are overlapped with each other, and the center member 2A has a structure in which the reinforcement 8 and the cross member 4B are integrally formed. is there.

As shown in FIG. 4, a differential mount 5 for supporting the stay 7 at the rear end 12 of the rear differential case 1 is fixed to the bottom surface 48 of the cross member 4B on which the reinforcement 8 is provided. The diff mount 5 has a main body made of a vibration-proof member 51 fastened to the hole 49 and the tube nut 81 of the bottom surface 48 of the cross member 4B with bolts 52, and supports one side end of the stay 7. There is.

The center member 2B also has a cross end at its rear end .
The center member 2 via the rear differential case 1 to the number 4B.
The center member 2A is connected to the rear end of A at a position symmetrical with respect to the center member 2A, and the other side end of the stay 7 at the rear end 12 of the rear differential case 1 is supported by the differential mount 5.

In the above structure, the vibration of the rear differential case 1 is input to the rear cross member 4B. The vibration force is particularly large in the front-rear direction, but front and rear cross members 4A, 4B
Since the center members 2A and 2B connecting the two are linearly provided in the front-rear direction, vibration in the front-rear direction acts in the axial direction, and the center members 2A and 2B exhibit strong rigidity. Moreover,
The center members 2A and 2B have their centers at the rear
Vibration from the case 1 is passed through the stay 7 to the cross member.
Match these vibration input points to 4B
Is connected to the cross member 4B, the reinforcing effect of the center members 2A, 2B against the vibration of the cross member 4B is maximized, and the deformation of the cross member 4B together with the center members 2A, 2B is prevented.

[0017]

According to the present invention, in the structure for supporting the rear differential case, the strength of the supporting part for the rear differential case can be improved as compared with the conventional structure without increasing the number of parts. Therefore, the noise and vibration performance of the vehicle can be improved. Further, the plate thickness of the center member that reinforces the front and rear cross members can be reduced, and the weight and cost can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing a support structure of a rear differential case according to the present invention.

2A and 2B show an essential part of the present invention. FIG. 2A is an exploded perspective view of a supporting portion structural member, and FIG. 2B is a perspective view of the supporting portion.

FIG. 3 is a plan view of the support portion of the present invention shown in FIG.

FIG. 4 is a sectional view taken along a line IV-IV in FIG.

FIG. 5 is a schematic plan view showing a conventional support structure of a rear differential case.

6A is a perspective view of a conventional structure corresponding to FIG. 2B, and FIG. 6B is a plan view of a conventional structure corresponding to FIG.

[Explanation of symbols]

1 Rear differential case 11 Front end of rear differential case 12 Rear end of rear differential case 13 Differential support members 2A, 2B Center members 3A, 3B Side member 4A Front cross member 4B Rear cross member 5 Differential mount 7 Rear differential case stay 8 Reinforcement

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP 59-67175 (JP, A) JP 7-179111 (JP, A) JP 4-292224 (JP, A) Actual flat 4- 7926 (JP, U) Actually open 59-72125 (JP, U) Actually open 3-17980 (JP, U) Actually open 1-59778 (JP, U) Actually open 4-28122 (JP, U) Actual development Sho 59-188725 (JP, U) Actual development 2-107526 (JP, U) Actual development 6-65048 (JP, U) Actual public 3-13052 (JP, Y2) (58) Fields investigated (Int.Cl. ⁷ , DB name) B62D 21/00 B62D 21/02 B60K 17/16 B62D 25/20

Claims (2)

(57) [Claims] 1. A rear differential case is arranged between front and rear cross members installed between left and right side members, and a front end of the rear differential case is supported by a front cross member by a differential support member extending forward from the front end. The rear differential is supported by a rear cross member via a diff mount by stays extending from the rear end to the left and right, and a pair of center members are provided on both left and right sides of the rear differential case to bridge the front and rear cross members. In the support structure of the case, the center member is provided in a straight line in the vehicle front-rear direction, and the rear end of the center member is located in the center member.
Heart support part structure of the rear differential case of a vehicle, characterized in that ligated to the rear cross member at a position that matches with the center of the respective differential mount. 2. The rear cross member is provided with a reinforcement for reinforcing a mounting portion to the differential mount, and a rear end of the center member is fixed to the rear cross member integrally with the reinforcement. 1
The structure for supporting the rear differential case of the vehicle described above.