Rear Body Structure With Longitudinal Members for Impact Energy Absorption
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Solution Overview
Problem
Current rear structures of hybrid electric vehicles are inadequate in absorbing high-speed rear shocks efficiently, often increasing mass and complexity while being costly to maintain, and do not effectively distribute energy absorption across the vehicle frame.
Innovation Solution
A rear vehicle structure featuring lateral lanes and longitudinal members that are not attached to each other, with each member connected to transverse structures, allowing for simultaneous energy absorption during longitudinal shocks, reducing the need for additional fixation boxes and simplifying assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional energy absorption systems with crash boxes are used, then high-speed impact energy can be absorbed, but the mass increases and production complexity increases
Solution Approach 1:
The energy absorption function is segmented between two independent longitudinal members (side members) that are spaced apart in the transverse direction. Each member independently absorbs impact energy through its connection to transverse structural elements, eliminating the need for a single complex crash box system.
Solution Approach 2:
The energy absorption mechanism transitions from a single-point absorption system to a distributed spatial system. By positioning longitudinal members at a distance in the transverse direction and connecting them to transverse structural elements, the absorption occurs across multiple dimensions (longitudinal and transverse), improving efficiency without increasing complexity.
2Strength
If longitudinal members are added to the rear structure, then impact resistance improves, but the mass increases
Solution Approach 1:
The longitudinal members serve multiple functions: they provide structural support for the vehicle body, enable energy absorption during impact through their connection to transverse elements, and contribute to the overall rigidity of the rear structure. This multi-functionality reduces the need for additional dedicated components that would increase mass.
Solution Approach 2:
The energy absorption function is merged into the existing longitudinal members and transverse structural elements rather than being implemented through separate dedicated components. This integration allows the structure to perform both load-bearing and energy absorption functions using the same components, avoiding additional mass.
3Strength
If side members are spaced apart in the transverse direction, then energy distribution improves, but the structural compactness decreases
Solution Approach 1:
The transverse space is segmented by positioning longitudinal members at a predetermined distance apart. This segmentation allows impact energy to be distributed across multiple connection points with transverse structural elements, improving energy distribution while maintaining reasonable structural compactness through optimized spacing.
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention concerns a structure (1) of a motor vehicle body rear part having a longitudinal direction and a transverse direction perpendicular to the longitudinal direction, the structure comprising two lateral side members (10, 11) extending in the longitudinal direction, each lateral side member having an end connected to a front transverse structure element (12) and another end connected to a rear transverse structure element (13), each transverse structure element (12, 13) extending in the transverse direction, characterised in that it comprises, between the two side members (10, 11), two longitudinal members (14, 15) extending in the longitudinal direction and each located at a distance from a side member (10, 11) in the transverse direction, each longitudinal member (14, 15) having an end connected to the front transverse structure element (12) and another end connected to the rear transverse structure element (13).