Rear Body Impact Absorber Layout Around Hydrogen Fuel Tanks
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Solution Overview
Problem
In vehicles using hydrogen gas as fuel, the impact absorbing member cannot be disposed along the lower surface of the floor panel due to the presence of the fuel tank, leading to insufficient impact absorption and potential deviation during collisions, which compromises occupant safety.
Innovation Solution
A vehicle body rear structure with a detachable impact absorbing member attached to the floor panel via a bracket, featuring a first extending portion along the floor panel and a second extending portion forward, and an extension member above it, ensuring contact with the subframe and contact objects, while being fixed to the bracket and floor panel for enhanced stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the impact absorbing member is disposed along the lower surface of the floor panel in a vehicle with a fuel tank, then the fuel tank can be protected, but the impact absorbing member cannot be properly positioned leading to insufficient impact absorption
Solution Approach 1:
The impact absorbing member is configured with a first extending portion along the lower surface of the floor panel and a second extending portion that protrudes forward, creating a three-dimensional arrangement that navigates around the fuel tank while maintaining impact absorption capability. This spatial reconfiguration allows the member to adapt to the fuel tank's presence without compromising its protective function.
2Reliability
If the front end portion of the impact absorbing member is disposed close to the subframe, then contact reliability is improved, but the overlap with contact objects behind may be reduced
Solution Approach 1:
The impact absorbing member is divided into multiple portions: a first extending portion along the floor panel, a second extending portion protruding forward, and an extension member above it. This segmentation allows different parts to serve different functions - the forward-protruding portions ensure subframe contact while the vertically extended portions maintain overlap with contact objects behind, resolving the spatial conflict.
3Force
If the impact absorbing member is positioned to ensure contact with subframe, then impact load transmission is improved, but positional deviation during collision may occur
Solution Approach 1:
Different portions of the impact absorbing member have different spatial characteristics optimized for their specific functions. The second extending portion and extension member are positioned to ensure contact with the subframe for load transmission, while the overall configuration maintains stability by distributing contact points and preventing positional deviation during collision.
Data Source
AI summary
A vehicle body rear structure includes a floor pan 13, a subframe, an impact absorbing member 4 provided behind the subframe, a bracket 5 for detachably attaching the impact absorbing member 4, and an extension member 6 provided to face a rear end portion 39 of the impact absorbing member 4. The impact absorbing member 4 has a first extending portion 47 along a lower surface 13a of the floor pan 13 and a second extending portion 48 that extends forward with respect to the floor pan 13. The extension member 6 extends above the impact absorbing member 4 in the vertical direction.