Front Pillar Structure with Intermediary Bulkheads for Collision Load Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicle front pillar structures face challenges in suppressing the separation of the joint portion between the outer and inner flange parts during front collisions, as the collision load causes deformation and potential separation at the spot welds.
Innovation Solution
The front pillar structure incorporates an outer bulkhead and an inner bulkhead disposed between the front pillar outer and inner panels, forming closed cross-sectional shapes that absorb collision loads through plastic deformation, reducing the load on the joint parts and preventing separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the outer flange part and inner flange part are directly joined together at the vehicle rearward side, then the structure is simple, but the joint portion separates during front collision due to deformation and retraction
Solution Approach 1:
A buffer member is introduced as an intermediary component between the outer flange part and inner flange part at the vehicle rearward side. This buffer member absorbs collision loads through plastic deformation, preventing direct transmission of force that would cause separation of the joined flange parts. The buffer member acts as a mediator that protects the joint portion while maintaining structural integrity during front collisions including small overlap collisions.
2Force
If the cowl top side panel, cowl top panel, bulkhead, and door belt line reinforcement are arranged in a straight line, then collision load transmission is improved, but the joint portion between outer and inner flange parts still separates due to deformation
Solution Approach 1:
The buffer member is positioned at the vehicle rearward side between the outer and inner flange parts to serve as a mediator. It absorbs collision loads through controlled plastic deformation, preventing the direct force transmission that would otherwise cause separation of the joined flange parts. This allows the straight-line arrangement for load transmission to be maintained while protecting the joint portion.
Solution Approach 2:
The buffer member is designed to undergo plastic deformation during collision, changing its physical state from rigid to deformed. This parameter change allows it to absorb energy and reduce the load transmitted to the joint portion between the outer and inner flange parts, preventing separation while maintaining the overall load transmission path.
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 effectively suppresses the separation of the joint parts between the outer and inner flange parts by distributing and absorbing the collision load, enhancing the structural integrity during front collisions.
Implementation Method 1
by plastic deformation of the outer bulkhead and the inner bulkhead, at least a part of the collision load is absorbed
Data Source
AI summary
A front pillar structure, includes: a front pillar outer panel having an outer flange part at a vehicle forward side and a vehicle rearward side; a front pillar inner panel having an inner flange part joined to the outer flange part at each of the vehicle forward side and the vehicle rearward side; an outer bulkhead joined to the front pillar outer panel so as to configure a closed cross-sectional shape with the front pillar outer panel; an inner bulkhead that is joined to the front pillar inner panel so as to configure a closed cross-sectional shape with the front pillar inner panel, and that is disposed at a vehicle rearward side of the outer bulkhead, so as to overlap with the outer bulkhead in a vehicle width direction; and a cowl top side panel disposed at a vehicle forward side of the front pillar outer panel.