Rear Side Frame Reinforcement for Side-Collision Load Distribution
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Solution Overview
Problem
Conventional rear part structures of vehicle bodies fail to effectively prevent deformation of the rear side frame during side collisions, especially with the increasing weight of vehicles due to large batteries, leading to potential entry of the frame into the vehicle interior.
Innovation Solution
A rear part structure featuring a rear side frame with a reinforcing member extending between connection points of front and rear cross members, along with additional partition and wheelhouse gussets, to distribute and transmit collision loads, enhancing rigidity and preventing deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the vehicle is equipped with large batteries to increase power, then the power of the vehicle is improved, but the weight of the vehicle increases and the load during side collision increases
Solution Approach 1:
The rear side frame is divided into multiple sections with a reinforcing member positioned between the first connection part (front cross member connection) and the second connection part (rear cross member connection). This segmentation allows the reinforcing member to specifically strengthen the vulnerable middle section without adding weight to the entire frame structure.
Solution Approach 2:
The reinforcing member is strategically placed only in the section between the first and second connection parts where the load is most concentrated during side collisions. This local reinforcement provides targeted strength improvement without globally increasing the frame weight, resolving the contradiction between power requirements and weight constraints.
2Device complexity
If the conventional rear side frame structure is used, then the device complexity is low, but the rear side frame deforms under excessive collision load
Solution Approach 1:
The reinforcing member is pre-installed in the rear side frame between the connection parts before any collision occurs. This preliminary structural preparation ensures that when side collision loads are applied, the reinforcing member is already in position to distribute and resist the forces, preventing deformation without requiring complex active response systems.
Solution Approach 2:
The reinforcing member creates a composite structural system within the rear side frame, combining the original frame members with the additional reinforcing element. This composite structure achieves enhanced strength and load distribution capability while maintaining relatively simple construction methods and avoiding excessive complexity.
3Stability of the object's composition
If the reinforcing member is added between the connection parts, then the rigidity of the rear side frame is improved, but the device complexity increases
Solution Approach 1:
The reinforcing member extends in the vehicle width direction, adding a transverse dimension of stiffness to the primarily longitudinal rear side frame structure. This dimensional addition creates a grid-like reinforcement pattern that significantly improves rigidity while using a simple linear member geometry that does not substantially increase manufacturing or assembly complexity.
Data Source
AI summary
A rear part structure of a vehicle body includes: a rear side frame, extending in a front-rear direction of the vehicle body outside a floor of a rear part of the vehicle body in a vehicle width direction; a front cross member, connected to a first connection part of the rear side frame and extending inward in the vehicle width direction; a rear cross member, connected to the rear side frame by a second connection part positioned on a rear side of the first connection part and extending inward in the vehicle width direction; an arm attachment part, provided on the rear side frame and connecting a trailing arm; and a reinforcing member, extending in the vehicle width direction within a section of the rear side frame. The reinforcing member is positioned between the first connection part and the second connection part in the front-rear direction of the vehicle body.