Vehicle Rear Side Member Buckling for Collision Avoidance
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Solution Overview
Problem
Conventional vehicle rear structures face challenges in stably buckling and deforming to avoid collisions during rear collisions, as the input direction, magnitude, and randomness of collision loads make it difficult to maintain a desired deformation form.
Innovation Solution
The vehicle rear structure incorporates rear side members with a hat sectional shape, featuring a fragile section on the upper plate further forward than the center axis of the fastening member, which buckles first under compression loads, allowing the rear suspension member to tilt forward and avoid collisions with the battery module, along with a load-dispersing bracket and reinforcing member to manage stress distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the rear side member is designed to buckle under compression load to prevent collision, then collision avoidance is improved, but the stability of deformation form deteriorates due to random load input
Solution Approach 1:
The rear side member is divided into a deformation section with a specific cross-sectional shape that is designed to buckle in a controlled manner. This segmentation allows the structure to collapse into a predetermined deformation form that tilts the fastening member forward, preventing collision with the battery module while maintaining stable deformation characteristics despite random load inputs.
Solution Approach 2:
The cross-sectional shape parameters of the rear side member are specifically designed to control buckling behavior. By adjusting geometric parameters such as wall thickness distribution and cross-sectional geometry in the deformation section, the structure achieves stable forward tilting deformation under compression loads, ensuring consistent collision avoidance performance.
2Object-affected harmful factors
If the rear side member buckles to tilt the rear suspension member forward, then collision with battery module is avoided, but the structural strength deteriorates
Solution Approach 1:
The rear side member is segmented into a deformation section and a non-deformation section. The deformation section has a cross-sectional shape designed for controlled buckling, while the non-deformation section maintains high structural strength. This segmentation allows the structure to sacrifice localized strength in the deformation zone to achieve overall collision avoidance while preserving structural integrity in critical areas.
Solution Approach 2:
Different sections of the rear side member have different structural qualities. The deformation section has optimized cross-sectional geometry for stable buckling, while other sections maintain higher strength characteristics. This local differentiation allows the structure to achieve both collision avoidance through controlled deformation and sufficient structural strength for normal operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enables stable downward buckling of the rear side member, facilitating a forward tilting posture of the rear suspension member, effectively preventing collisions and managing load transmission during rear collisions.
Implementation Method 1
a fragile section on the upper plate further forward than a center axis of a fastening member fastening a vehicle length direction rearward of the rear suspension member upward to the rear side member. When a so-called rear collision, in which an obstacle collides with a vehicle rear surface, occurs, a shock load is transmitted to the rear side member 200... a compression load is mainly input to the rear side member 200. The rear side member 200 buckles when the compression load exceeds a withstanding load
Data Source
AI summary
A rear side member rear includes a bottom plate, an upper plate, and a side plate that connects the bottom plate and the upper plate. On the bottom plate, a body mount bracket rear is provided. A fastening member fastens a vehicle length direction rearward of a rear suspension member upward to the body mount bracket rear. On the upper plate, a step structure, which is a fragile section, is formed further forward than a center axis of the suspension member bolt fastened to the body mount bracket rear.