JP2000255455A - Car body structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve riding comfort by suppressing vibration in a rear floor panel or the like having a tire well formed therein in a vehicle. SOLUTION: Both ends of a rear cross member 4 extended in a car width direction are welded to left and right rear side members 2, ends of lower suspension arms 9 are pivoted on both ends of the rear cross member 4, and reinforcing ribs 12 and 12 welded to the rear cross member 4 and extended in the back and forth direction of a vehicle are also welded to the lower surface of a tire well 11 formed in a rear floor panel and welded to the upper surface of the rear cross member 4 in a wide range.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear structure of a vehicle body, and more particularly to a structure around a rear floor panel.

[0002]

2. Description of the Related Art In a rear suspension of a vehicle, a lower arm having one end pivotally supported by a vehicle body and arranged substantially in the vehicle width direction has the other end supporting a rear wheel via a hub carrier or the like. The lower arm resonates in the vehicle front-rear direction due to the vibration applied from the rear wheels while the vehicle is running, so that both ends are connected to the lower arm. The above-mentioned vibration is transmitted to the rear floor panel provided in the vehicle, and the rear floor panel is likely to vibrate substantially in the vertical direction. Therefore, there is a possibility that vibration or abnormal noise is generated on the vehicle body side and the ride comfort of the vehicle is hindered. .

As shown in Japanese Utility Model Publication No. 6-28382, a reinforcement is applied between a spare tire pan recessed in a rear floor panel and a rear side frame, and a curved rear side frame is mounted on the vehicle body. It is conventionally known to suppress bending inward due to a large collision load on the rear part. In this case, however, the reinforcement is joined only to the narrow side of the spare tire pan, and the reinforcement is The support of the spare tire pan is extremely localized, so it is difficult to suppress the occurrence of substantially vertical vibration on the rear floor panel, and again, vibration and abnormal noise occur on the vehicle body side and hinder ride comfort It is inevitable that there is a danger.

[0004]

SUMMARY OF THE INVENTION The present invention suppresses vibration of a rear floor panel or the like in which a tire well is formed,
It is intended to improve the riding comfort of the vehicle.

[0005]

Therefore, a vehicle body structure according to the present invention has a rear cross member extending in the vehicle width direction and connected to a lower arm of a rear suspension, and a tire well formed by the rear cross member. And a reinforcing rib extending in the vehicle front-rear direction and connected to the rear cross member and the lower surface of the tire well, respectively.

That is, reinforcing ribs extending in the vehicle front-rear direction are respectively connected to the rear cross member and the lower surface of the tire well, and the rear cross member to which the lower arm of the rear suspension is connected, and the tire well formed to be supported by the rear cross member. The rigidity with the rear floor panel has been greatly increased, so that even if a vibration load is applied to the rear cross member from the lower arm, the vibration of the vehicle body such as the rear cross member and the rear floor panel is reliably suppressed. Occurrence of vibration and abnormal noise on the vehicle body side can be easily prevented.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention shown in the drawings will be described below. Front end portions of left and right rear side members 2 and 2 each having a hat-shaped cross section that are open upward;
The left and right ends of the cross member 3 extending in the vehicle width direction are connected to each other, and both ends of the rear cross member 4 extending in the vehicle width direction with a hat shape in a cross section opened upward are respectively connected to the intermediate portions of the left and right rear side members 2, 2. Welded.

[0008] The rear cross member 4 has both ends proximate to the left and right rear side members 2, 2 bent downward, and a central portion 5 in the vehicle width direction is disposed below the rear side member 2. A bracket 6 having a substantially U-shaped cross section extending in the vehicle width direction is integrally fixed to a lower portion,
A pivot shaft (not shown) having an axial center 8 in the vehicle front-rear direction is attached to holes 7 which form a part of the rear cross member 4 and are formed at both ends of the bracket 6 on the outer side in the vehicle width direction. One end of each of lower suspension arms 9, 9 extending in the vehicle width direction is pivotally supported on the pivot shaft via a rubber bush, and the other end of each of lower suspension arms 9, 9 supports left and right rear wheels (not shown). ing.

A rear floor panel 1 welded to the upper surfaces of the left and right rear side members 2 and 2 and the cross member 3 is provided.
0 is formed integrally with a tire well 11 projecting downward at the center in the vehicle width direction and storing a spare tire (not shown);
The lower surface of the tire well 11 is welded to the upper surface of the rear cross member 4, while the reinforcing ribs 12, 12 which are substantially triangular in a side view and extend in the vehicle front-rear direction, are respectively close to the axis 8 of the rear cross member 4. Welded to the rear wall of the vehicle,
Further, it is welded to the lower surface of the tire well 11 over substantially the entire length of the lower surface of the tire well 11 in the vehicle longitudinal direction.

In the above-mentioned vehicle body structure, when a vibration load is applied to the rear cross member 4 from the rear wheels via the respective lower suspension arms 9 during running of the vehicle, the tires extend over a wide range substantially over the entire length of the lower surface of the tire well 11 in the vehicle longitudinal direction. Reinforcing ribs 12, 12 welded to the lower surface of the well 11
However, since each is welded to the rear cross member 4 to increase the rigidity of the rear cross member 4, the vibration of the rear cross member 4 is effectively suppressed, and substantially the lower surface of the tire well 11 in the vehicle front-rear direction. Since the reinforcing ribs 12 and 12 are welded to the lower surface of the tire well 11 over a wide range over the entire length, the rigidity of the rear floor panel 10 on which the tire well 11 is formed is increased, and the rear floor panel 10 vibrates substantially vertically. Is effectively suppressed, and the pivot shaft 8 of the lower suspension arm 9 is
The reinforcing ribs 12 are provided near the rear cross member 4
Since the offset A between each axis 8 and each reinforcing rib 12 in the vehicle width direction is small, vibration is hardly transmitted from the lower suspension arm 9 to the rear floor panel 10 from this surface as well. Therefore,
Vibration of the vehicle body such as the rear cross member 4 and the rear floor panel 10 is reliably suppressed, and at the same time, generation of abnormal noise is prevented, so that the riding comfort of the vehicle can be easily improved.

Further, a bracket 6 is integrally fixed to a lower portion of the rear cross member central portion 5, and each reinforcing rib 12 is attached to the central portion 5 of the rear cross member 4 and the bracket 6.
Are welded, the vertical offset B between the center of gravity O of each reinforcing rib 12 and the lower suspension arm pivot 8 is easily reduced, and vibration is transmitted from each lower suspension arm 9 to each reinforcing rib 12. For this reason, the tire well 11
Vibration of the rear floor panel 10 to which the lower surface is welded is suppressed, and vibration and abnormal noise on the vehicle body side can be easily prevented.

In the above embodiment, the reinforcing ribs are connected to the lower surface of the tire well in a particularly wide range over the substantially entire length of the lower surface of the tire well in the longitudinal direction of the vehicle. It is preferable that the reinforcing ribs are connected to the lower surface of the tire well over approximately 1/2 or more. Needless to say, the number of the reinforcing ribs may be appropriately increased or decreased.

[0013]

In the vehicle body structure according to the present invention, the reinforcing rib is connected to the rear cross member and is connected to the lower surface of the tire well.
Since the rigidity of the rear cross member and the rear floor panel is greatly increased, even if a vibration load is applied to the rear cross member from the lower arm, the transmission of the vibration to the rear floor panel is reliably suppressed. , The occurrence of vibrations and abnormal noises can be easily prevented, and the riding comfort of the vehicle can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view of an embodiment of the present invention.

FIG. 2 is a top view of a main part of the embodiment.

FIG. 3 is a perspective view of a main part of the embodiment.

[Explanation of symbols]

 2 Rear side member 4 Rear cross member 5 Central part 6 Bracket 9 Lower suspension arm 10 Rear floor panel 11 Tire well 12 Reinforcing rib

Claims (1)

[Claims] 1. A rear cross member extending in a vehicle width direction and connected to a lower arm of a rear suspension, a rear floor panel supported by the rear cross member and having a tire well formed therein, and the rear cross member extending in a vehicle front-rear direction. A vehicle body structure having a reinforcing rib connected to a member and a lower surface of the tire well, respectively.