Rear Body Structure With Bracket Reinforcement for Impact Load Absorption
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Solution Overview
Problem
The existing vehicle body rear structure is bulky and heavy at the connecting portion between the rear side frame and the side sill, which hinders weight reduction while maintaining high energy absorption performance for impact loads.
Innovation Solution
A vehicle body rear structure design that incorporates a bracket reinforcement member connected to the arm attachment bracket and the cross member, which efficiently transmits impact loads to the cross member and absorbs energy, while minimizing the size and weight of the connecting portion by using a L-shaped bracket reinforcement member and a bulkhead to support the rear side frame and side sill.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the inner region of the side sill is supported by the cross member and extension portion in the upward/downward direction, then energy absorption performance is improved, but the structure around the connecting portion increases in size and weight
Solution Approach 1:
The patent transitions from single-direction (upward/downward) support to multi-directional support by adding lateral connection through the bracket reinforcement member. This connects the cross member to the side sill not only vertically but also laterally, creating a three-dimensional support structure that improves energy absorption without requiring increased vertical support dimensions
Solution Approach 2:
The support function is divided into multiple components: the cross member provides primary support, while the bracket reinforcement member provides additional lateral and diagonal support. This segmentation allows each component to be optimized independently, reducing overall weight while maintaining or improving energy absorption performance
2Force
If the inner region of the side sill is supported by the cross member and extension portion, then impact load transmission is improved, but the structure around the connecting portion increases in size
Solution Approach 1:
The bracket reinforcement member introduces lateral and diagonal dimensions to the support structure, connecting the cross member to the side sill through a three-dimensional configuration. This allows impact loads to be transmitted through multiple paths and directions, improving load transmission efficiency without extending the vertical or horizontal dimensions of the connecting portion
Solution Approach 2:
The bracket reinforcement member acts as an intermediary component that mediates between the cross member and the side sill. It provides a compact connection structure that efficiently transmits impact loads while maintaining a small footprint, avoiding the need for large direct connections between the cross member and side sill
Data Source
AI summary
A vehicle body rear portion includes a side sill, a rear side frame, a cross member, a side door, a trailing arm, an arm attachment bracket, and a bracket reinforcement member. The side door includes a door beam disposed at a position overlapping an outer side of the side sill in a vehicle width direction. The trailing arm has a front end portion that is swingably supported by a front region of a rear side frame via a mounting member. The bracket reinforcement member has an outer end portion in the vehicle width direction that is directly or indirectly coupled to an internal angle portion above the side sill, and an inner end portion in the vehicle width direction that is directly or indirectly coupled to an outer end portion of the cross member in the vehicle width direction.