S-Shaped Vehicle Door Beam for Crash Load Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicle door structures face challenges in effectively transmitting frontal crash loads from the front pillar to the center pillar during a frontal crash and absorbing side impact loads without obstructing internal components, such as the window regulator, and may deform laterally, preventing the reinforcement beam from functioning as intended.
Innovation Solution
A vehicle door structure featuring a beam member with a C-shaped cross section, forming an S-shaped configuration that allows for efficient collapse and energy absorption during side crashes, and includes an engagement mechanism to prevent lateral shifting during frontal crashes, ensuring the beam can transmit loads effectively while maintaining space for internal components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a reinforcement beam with closed cross section is used to transmit frontal crash load, then the load transmission function is improved, but the side crash energy absorption capability deteriorates due to inability to collapse
Solution Approach 1:
The beam member is divided into multiple channel sections (first channel section, second channel section, third channel section, fourth channel section) arranged in sequence. This segmentation allows different sections to perform different functions: some sections provide structural strength for frontal crash load transmission, while others with open cross sections enable collapsing deformation for side crash energy absorption.
Solution Approach 2:
The beam member employs asymmetric cross section configuration where channel sections have different orientations and positions. The first and third channel sections extend in the fore-aft direction providing frontal strength, while the second and fourth channel sections are positioned to enable lateral collapsing. This asymmetric arrangement optimizes both frontal load transmission and side crash energy absorption simultaneously.
2Strength
If a reinforcement beam is added to the door structure, then the crash resistance is improved, but the internal space for components deteriorates
Solution Approach 1:
The beam member is strategically positioned and configured with channel sections at specific locations rather than using a uniformly thick beam throughout. The channel sections are arranged to provide reinforcement where crash forces are applied (frontal and side impact areas) while minimizing intrusion into the internal door space where components like window regulators are located.
Solution Approach 2:
The beam member utilizes a three-dimensional configuration with channel sections extending in different directions (fore-aft and laterally). This spatial arrangement allows the beam to provide comprehensive crash resistance in multiple directions while maintaining clearance in the internal door volume for component placement.
3Force
If the beam member is positioned to support bending moment, then the reaction force requirement deteriorates, but the lateral shifting prevention capability improves
Solution Approach 1:
The beam member is pre-configured with channel sections positioned to automatically engage and prevent lateral shifting between the door structure and front pillar during a frontal crash. The first channel section is specifically positioned to restrict lateral movement before the main impact force is fully applied, preparing the structure to better handle the subsequent loading.
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 S-shaped beam member effectively absorbs side crash energy and supports bending moments during frontal crashes with minimal reaction force, preventing door deformation and ensuring the reinforcement beam functions as designed, while maintaining space for internal components and optimizing load path efficiency.
Implementation Method 1
absorb the impact load at the time of a side crash by a collapsing deformation of the cross section
Implementation Method 2
transmit the frontal crash load from the front pillar to a center pillar (B pillar)
Implementation Method 3
serve as a reaction force member for supporting a bending moment created around the connecting part between the lower end of the front pillar lower member and the front end of the side sill
Data Source
AI summary
The frontal crash load is transmitted from a front pillar to a center pillar in a reliable manner so that a bending moment caused by the frontal crash load is favorably supported, and the deformation of the door is avoided. A beam member attached to an inner panel includes a S shaped cross section member. An upper channel section of the S shaped cross section member extends along the lower edge of a window opening, and a lower channel section extends adjacent to and in parallel to the lower edge of a window opening in a rear part of the door and is offset toward a lower part of the vehicle body in a rear part of the door, with a front end being located at a same elevation as an upper door hinge.