US-12617475-B2 - Vehicle body rear structure

Abstract

An embodiment rear structure for a vehicle body includes a rear floor panel and a rear floor side member mounted on both sides of an upper portion of the rear floor panel along a length direction of the vehicle body and defining a side closed section together with the rear floor panel.

Inventors

• Chang Hak Kang
• Chan Woong Jeon
• SANG KYOUNG HAN
• HaeHoon Lee

Assignees

• HYUNDAI MOTOR COMPANY
• KIA CORPORATION

Dates

Publication Date

20260505

Application Date

20230905

Priority Date

20221213

Claims (20)

1. 1 . A rear structure for a vehicle body, the rear structure comprising: a rear floor panel; a rear floor side member mounted on both sides of an upper portion of the rear floor panel along a length direction of the vehicle body and defining a side closed section together with the rear floor panel; a cross member disposed in a width direction of the vehicle body and connected with a front of the rear floor side member; and a center floor panel, wherein a part of the center floor panel is inserted between the cross member and the rear floor panel, wherein the cross member comprises a cross lower flange and a cross upper flange connected to the center floor panel, and the cross member and the center floor panel define a cross closed section between the cross lower flange and the cross upper flange.
2. 2 . The rear structure of claim 1 , wherein the rear floor panel comprises a rear floor front flange configured to be welded integrally with the cross lower flange and the center floor panel at a front portion corresponding to the cross lower flange.
3. 3 . The rear structure of claim 2 , wherein the rear floor panel further comprises a rear floor bent portion bent toward the cross lower flange.
4. 4 . The rear structure of claim 1 , wherein the rear floor side member comprises a side member front flange configured to be integrally welded with the cross upper flange and the center floor panel at a position corresponding to the cross upper flange at a front portion thereof.
5. 5 . The rear structure of claim 4 , wherein the rear floor side member further comprises a rear side member bent portion bent toward the cross upper flange.
6. 6 . The rear structure of claim 1 , further comprising a rear wheel arch member connected to an end of the cross member and provided on both sides of the vehicle body, respectively.
7. 7 . The rear structure of claim 6 , further comprising a side sill connected to a front of the rear wheel arch member and the center floor panel and provided on both sides of the vehicle body, respectively.
8. 8 . A vehicle comprising: a vehicle body; a rear floor panel at a rear of the vehicle body; a rear floor side member mounted on both sides of an upper portion of the rear floor panel along a length direction of the vehicle body and defining a side closed section together with the rear floor panel, wherein the rear floor side member comprises: a side member lower flange; and a side member upper flange; a cross member disposed in a width direction of the vehicle body and connected with a front of the rear floor side member, wherein the cross member comprises a cross lower flange and a cross upper flange connected to the center floor panel; and a center floor panel, wherein a part of the center floor panel is inserted between the cross member and the rear floor panel, wherein the cross member and the center floor panel define a cross closed section between the cross lower flange and the cross upper flange.
9. 9 . The vehicle of claim 8 , further comprising: a back panel connected with a rear of the rear floor side member; a chamfer provided at a rear of the rear floor panel toward an inside of the vehicle body; and a side member rear flange disposed at the rear of the rear floor side member, wherein the chamfer, the side member rear flange, and the back panel are integrally welded.
10. 10 . The vehicle of claim 8 , wherein the rear floor panel comprises: a rear floor front flange configured to be welded integrally with the cross lower flange and the center floor panel at a front portion corresponding to the cross lower flange; and a rear floor bent portion bent toward the cross lower flange.
11. 11 . The vehicle of claim 10 , wherein the rear floor side member comprises: a side member front flange configured to be integrally welded with the cross upper flange and the center floor panel at a position corresponding to the cross upper flange at a front portion thereof; and a rear side member bent portion bent toward the cross upper flange.
12. 12 . The vehicle of claim 8 , further comprising a rear wheel arch member connected to an end of the cross member and provided on both sides of the vehicle body, respectively.
13. 13 . The vehicle of claim 12 , further comprising a side sill connected to a front of the rear wheel arch member and the center floor panel and provided on both sides of the vehicle body, respectively.
14. 14 . A vehicle comprising: a vehicle body; a rear floor panel at a rear of the vehicle body; a rear floor side member mounted on both sides of an upper portion of the rear floor panel along a length direction of the vehicle body and defining a side closed section together with the rear floor panel; a cross member disposed in a width direction of the vehicle body and connected with a front of the rear floor side member; and a center floor panel, wherein a part of the center floor panel is inserted between the cross member and the rear floor panel, wherein the cross member comprises a cross lower flange and a cross upper flange connected to the center floor panel, and the cross member and the center floor panel define a cross closed section between the cross lower flange and the cross upper flange.
15. 15 . The vehicle of claim 14 , wherein the rear floor panel comprises a rear floor front flange configured to be welded integrally with the cross lower flange and the center floor panel at a front portion corresponding to the cross lower flange.
16. 16 . The vehicle of claim 15 , wherein the rear floor panel further comprises a rear floor bent portion bent toward the cross lower flange.
17. 17 . The vehicle of claim 14 , wherein the rear floor side member comprises a side member front flange configured to be integrally welded with the cross upper flange and the center floor panel at a position corresponding to the cross upper flange at a front portion thereof.
18. 18 . The vehicle of claim 17 , wherein the rear floor side member further comprises a rear side member bent portion bent toward the cross upper flange.
19. 19 . The vehicle of claim 14 , further comprising a rear wheel arch member connected to an end of the cross member and provided on both sides of the vehicle body, respectively.
20. 20 . The vehicle of claim 19 , further comprising a side sill connected to a front of the rear wheel arch member and the center floor panel and provided on both sides of the vehicle body, respectively.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application claims the benefit of Korean Patent Application No. 10-2022-0173931, filed on Dec. 13, 2022, which application is hereby incorporated herein by reference. TECHNICAL FIELD The present invention relates to a vehicle body rear structure. BACKGROUND Generally, a rear floor side member is disposed under the rear floor, and the rear floor side member plays a major role in the crash and strength of the vehicle. In general, seats and cargo are mounted on the upper part of the rear floor, and additional parts are required to be mounted. Recently, the demand for environment-friendly vehicles such as electric vehicles and hydrogen vehicles is increasing, and research on autonomous vehicles is expanding. Parts necessary for such an environment-friendly and/or autonomous driving vehicle, such as high-weight materials (HPC) or parts that may be sensitive to vibration, for example, autonomous driving control equipment, and parts that are vibration sources (compressor of sensor cleaner) or water pump, etc. are mounted on the rear floor. However, since the rear floor side member is disposed under the rear floor, the height of the rear floor side member is limited, which causes a problem in that the strength of the rear floor side member is insufficient. That is, interference with lower chassis parts occurs in terms of the body on frame characteristic, and in order to avoid this, the cross-section of the rear floor side member, particularly the height direction of the cross-section, is limited. In order to secure the cross-section of the height direction of the rear floor side member, the cargo loading space must be reduced. In addition, in the case of a rear collision of a vehicle, damage to autonomous driving equipment may occur due to the insufficient strength of rear floor side members, and in the floor structure of a delivery vehicle, the engagement robustness of autonomous driving parts that are relatively sensitive to vibration/collision may be insufficient. The above information disclosed in this background section is only for enhancement of understanding of the background of embodiments of the invention, and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. SUMMARY The present invention relates to a vehicle body rear structure. Particular embodiments relate to a vehicle body rear structure capable of enhancing collision response performance at the rear of the vehicle body and securing an indoor space behind the vehicle body. Embodiments of the present disclosure provide a vehicle body rear structure capable of enhancing crash response performance at the rear of the vehicle body and securing an indoor space at the rear of the vehicle body. A vehicle body rear structure according to an exemplary embodiment of the present invention may include a rear floor panel and a rear floor side member mounted on both sides of an upper portion of the rear floor panel along the length direction of the vehicle body and forming a side closed section together with the rear floor panel. The vehicle body rear structure according to an exemplary embodiment of the present invention may further include a back panel connected with the rear of the rear floor side member. The vehicle body rear structure according to an exemplary embodiment of the present invention may further include a chamfer formed at the rear of the rear floor panel toward the inside of the vehicle body and a side member rear flange formed at the rear of the rear floor side member, and the chamfer, the side member rear flange, and the back panel may be integrally welded. The vehicle body rear structure according to an exemplary embodiment of the present invention may further include a cross member disposed in the width direction of the vehicle body and connected with the front of the rear floor side member. The vehicle body rear structure according to an exemplary embodiment of the present invention may further include a center floor panel, a part of which is inserted between the cross member and the rear floor panel. The cross member may include a cross lower flange and a cross upper flange connected to the center floor panel, and the cross member and the center floor panel may form a cross closed section between the cross lower flange and the cross upper flange. The rear floor panel may include a rear floor front flange formed to be welded integrally with the cross lower flange and the center floor panel at the front portion corresponding to the cross lower flange. The rear floor panel may further include a rear floor bent portion bent toward the cross lower flange. The rear floor side member may include a side member front flange formed to be integrally welded with the cross upper flange and the center floor panel at a position corresponding to the cross upper flange at the front portion thereof. The floor side member may further i