Rear Floor Annular Structure for Multi-Path Crash Load Transfer
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Solution Overview
Problem
Conventional vehicle rear floors suffer from single force transmission paths, leading to excessive stress on components during collisions, poor structural rigidity due to welding defects, and inadequate buffering, with shelves and spare tire cabins having low bearing capacity and stability.
Innovation Solution
The rear floor is integrally formed with connecting plates, forming an annular reinforcing structure, and the spare tire cabin is mounted within a defined space by a curled edge and reinforced with injection-molded parts, enhancing structural compactness and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multiple sheet metal parts are welded together by spot welding process, then the rear floor structure can be assembled, but the local structural connection quality is poor and overall rigidity is insufficient
Solution Approach 1:
The patent integrates multiple sheet metal parts (rear floor panel, longitudinal beams, cross beams) into a一体化 structure through self-riveting connections, replacing traditional spot welding to achieve both manufacturing ease and connection reliability
Solution Approach 2:
The patent replaces the welding process with a self-riveting mechanical connection system, where rivets automatically form interlocking connections between parts, eliminating welding defects while maintaining structural integrity
2Device complexity
If force transmission relies mainly on rear floor longitudinal beam assembly and front floor doorsill beam, then the structure is simple, but the force transmission path is single and stress concentration occurs during collision
Solution Approach 1:
The patent segments the force transmission function across multiple structural paths by adding transverse beams and reinforcing connections, distributing collision forces through several independent load paths rather than relying on a single beam assembly
Solution Approach 2:
The patent adds transverse dimensions to force transmission by incorporating cross beams and transverse reinforcing members, creating a three-dimensional force distribution network that prevents stress concentration in any single direction
3Ease of operation
If shelf and spare tire cabin are mounted by simple clamping or screws, then the assembly is easy, but the bearing capacity is low and damage or falling off may occur
Solution Approach 1:
The patent integrates the shelf and spare tire cabin mounting structures with the rear floor structural beams, combining support and mounting functions into a unified load-bearing system that maintains ease of assembly while significantly increasing bearing capacity
Data Source
Figure 1
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AI summary
A lower vehicle body rear structure and a vehicle. The lower vehicle body rear structure comprises a rear floor integrally formed in a die-casting mode, rear floor longitudinal beam rear sections (103) fixedly connected to the rear floor, a shelf (15), and a spare tire cabin (16). Rear floor longitudinal beams (1) arranged on two sides of the rear floor, and a rear floor middle cross beam (2) and a rear floor rear cross beam (6) which are connected between the rear floor longitudinal beams (1) are formed on the rear floor, and rear wheel covers (3) connected to the rear floor longitudinal beams (1) are respectively arranged on the two sides of the rear floor. The shelf (15) is located above the rear floor, and the two ends of the shelf (15) are connected to the rear wheel covers (3) by means of connecting plates (14); and the rear floor, the shelf (15) and the two connecting plates (14) are connected to form an annular structure. Two rear floor longitudinal beam rear sections (103) are provided to be connected to the rear ends of the rear floor longitudinal beams (1) on the two sides, a rear supporting plate (11) is connected between the rear ends of the two rear floor longitudinal beam rear sections (103), and the spare tire cabin (16) is arranged in a mounting space defined by the rear floor, the rear supporting plate (11), and the rear floor longitudinal beam rear sections (103) on the two sides. According to the lower vehicle body rear structure of the present disclosure, improvement of the overall arrangement structure of a vehicle body framework of the rear portion of the vehicle, the shelf, and the spare tire cabin is facilitated.