Vehicle Body Bottom Structure with Triangular Crushing Space
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Solution Overview
Problem
Existing vehicle body structures face challenges in absorbing collision loads during narrow offset collisions, leading to deformation of the side sill, front pillar retraction, and increased weight due to reinforcing members, which complicates door operation and increases vehicle weight.
Innovation Solution
A vehicle body bottom structure featuring a dash lower, front pillar, and gusset forming a triangular crushing space to absorb collision loads, with a reinforcing frame and jack-up reinforcing plate to enhance absorption performance and reduce weight by optimizing the side sill's flexural rigidity and crushing load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reinforcing members are added to improve collision load absorption, then absorption performance is improved, but vehicle weight increases
Solution Approach 1:
The patent changes the geometric parameters of the side sill structure by introducing a crushing area with specific dimensional constraints (length L1 ≥ 100mm, width W1 ≥ 50mm) and controlling plate thickness variations. This allows the side sill to absorb collision loads through controlled deformation in the crushing area, eliminating the need for additional reinforcing members and reducing vehicle weight while maintaining safety performance.
2Strength
If the side sill is strengthened to prevent deformation, then structural strength is improved, but the side sill bends in a dogleg shape under collision load
Solution Approach 1:
The side sill is segmented into different functional areas: a crushing area at the front end designed to deform and absorb energy, and a non-crushing area with higher strength to maintain structural integrity. This segmentation allows the side sill to bend in a controlled manner within the crushing area while preventing unwanted dogleg deformation in the non-crushing area, resolving the contradiction between strength and shape maintenance.
3Stability of the object's composition
If the front pillar is reinforced to prevent retraction, then front pillar stability is improved, but door operation becomes difficult
Solution Approach 1:
The front pillar is designed with dynamic characteristics that allow controlled retraction during collision to absorb energy, while maintaining stability under normal conditions. The pillar's structural design includes features that enable it to deform in a predictable manner during impact, preventing excessive retraction that would interfere with door operation, thus balancing stability and ease of operation.
4Force
If diagonal members are added to disperse collision load, then load dispersion is improved, but device complexity increases
Solution Approach 1:
The side sill structure is designed to perform multiple functions: it serves as both a structural support element and a collision energy absorption mechanism. The crushing area with controlled geometric parameters enables the side sill to disperse collision loads effectively without requiring additional diagonal members, thus maintaining load dispersion performance while reducing structural complexity.
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 restricts front pillar retraction, reduces door operation difficulties, and minimizes vehicle weight while improving collision load absorption and flexural rigidity, maintaining door functionality and reducing weight through optimized design.
Implementation Method 1
a crushing space of a substantially triangular shape in a plan view is formed in a portion surrounded by the dash lower, the front pillar, and the gusset
Data Source
AI summary
A vehicle body bottom structure includes left and right side sills which are provided to extend in a vehicle front-rear direction along outside end portions of a vehicle body in a vehicle width direction, a dash cross member which is coupled to front ends of the left and right side sills, and extends in the vehicle width direction, an outrigger which is connected to a rear end of a front side frame, and coupled to each of the front ends of the left and right side sills, to extend in the vehicle width direction, and a dash lower having a wheel housing portion is clamped to be joined between the dash cross member and the outrigger.