Vehicle Rear Floor Double Panel Shear Deformation
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Solution Overview
Problem
Conventional vehicle body rear part structures rely on deformation or crushing of the rear bumper beam for impact load absorption, leading to ineffective energy absorption when impact is applied biasedly and increased vehicle weight due to extended rear side frames.
Innovation Solution
A vehicle body rear part structure featuring a double panel structure with an upper and lower wall extending beyond the rear side frames, combined with inclined support parts, allowing for shear deformation and energy absorption across a wider area without increasing vehicle weight, and incorporating a bumper beam for enhanced energy absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the rear side frames extend to the rear end part of the vehicle body, then the structure provides sufficient support, but the vehicle weight increases
Solution Approach 1:
The invention extracts the extended rear side frames from the vehicle body structure and replaces them with a double panel structure that extends to the rear end. This removes the unnecessary frame material while maintaining structural support through the newly designed panel configuration.
Solution Approach 2:
The invention transitions from a frame-based support system (one-dimensional linear extension) to a panel-based support system (two-dimensional surface extension). The double panel structure provides support through its planar configuration rather than through extended linear frames, reducing material usage while maintaining strength.
2Weight of moving object
If the rear bumper beam is made lighter or thinner, then the vehicle weight decreases, but the energy absorption capability is reduced
Solution Approach 1:
The invention segments the energy absorption function across multiple components: the double panel structure, the inclined support parts, and the rear bumper beam. This allows the bumper beam to be lighter while the overall system maintains adequate energy absorption through the coordinated deformation of all segments.
Solution Approach 2:
The invention changes the structural parameters of the rear floor panel by introducing a double panel configuration with specific thickness distributions. This creates regions of different stiffness that work together with the bumper beam to provide controlled energy absorption, allowing the bumper beam itself to be lighter.
3Ease of manufacture
If the rear floor panel uses a conventional single panel structure, then the manufacturing is simpler, but the energy absorption when impact is applied biasedly is ineffective
Solution Approach 1:
The invention transitions from a single panel (two-dimensional surface) to a double panel structure (three-dimensional layered configuration). This adds a vertical dimension to the panel structure, creating the inclined support parts that provide effective energy absorption when impact is applied biasedly to one side.
Solution Approach 2:
The invention introduces asymmetry in the panel structure through the inclined support parts that slope toward the front side toward the inner side in the vehicle width direction. This asymmetric configuration creates differential stiffness and deformation characteristics that effectively absorb energy during biased impact while maintaining manufacturing feasibility.
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
The structure effectively absorbs impact loads by shear deformation of the double panel structure, preventing weight increase and ensuring efficient energy absorption across a wide range, even when the bumper beam is made lighter or thinner.
Implementation Method 1
when an impact load is applied to one of the left and right sides of the vehicle body rear part, the load is applied as a load in the shear direction to the upper wall and the lower wall of the double panel structure
Implementation Method 2
the energy of the impact load can be absorbed by deformation or crushing of the rear bumper beam
Implementation Method 3
the energy of the impact load can be absorbed by deformation or crushing of the rear bumper beam
Data Source
AI summary
A vehicle body rear part structure includes a pair of rear side frames on left and right sides that extend substantially along a vehicle front-rear direction; and a rear floor panel to whose front part region, where a rear seat is disposed, the pair of rear side frames are combined. A rear part region of the rear floor panel is configured by a double panel structure having an upper wall and a lower wall. The rear part region of the rear floor panel extends further to a vehicle rear side than the pair of rear side frames. Each rear end part of the pair of rear side frames includes an inclined support part that inclines toward a vehicle front side toward an inner side in a vehicle width direction. The double panel structure is combined to the inclined support part of each of the rear side frames.