Vehicle Bumper Beam Displacement Promoting Parts Offset Collision
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Solution Overview
Problem
Existing vehicle body structures are insufficient in managing tensile loads on the non-collision side of the bumper beam during an offset collision, leading to a risk of separation from the skeleton members.
Innovation Solution
A vehicle body structure featuring a bumper beam with displacement promoting parts at its mounting points, allowing for controlled displacement under collision loads, and a bumper beam mounting member with specific extensions and displacement promoting features to absorb and distribute collision forces effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the bumper beam is rigidly fixed to the skeleton members, then the bumper beam maintains strong connection and positioning accuracy, but the non-collision side cannot withstand tensile loads during offset collision causing separation
Solution Approach 1:
The mounting structure is divided into multiple mounting members (first and second mounting members) distributed across the bumper beam. Each mounting member independently handles local loads, preventing concentrated stress that would cause separation. The segmentation allows the structure to maintain rigidity where needed while accommodating displacement elsewhere.
Solution Approach 2:
The patent introduces a displacement promoting part that enables controlled dynamic movement of the bumper beam during collision. This dynamic capability allows the non-collision side to deform and absorb tensile loads through controlled displacement rather than rigid resistance, preventing separation while maintaining overall structural integrity.
2Stability of the object's composition
If the bumper beam is made more rigid to prevent separation, then connection stability improves, but the ability to absorb collision loads through controlled displacement decreases
Solution Approach 1:
The bumper beam structure employs local quality differentiation through the displacement promoting part, which is specifically designed to be more deformable only at critical mounting locations. The rest of the bumper beam maintains its rigid structure for stability, while the localized soft zone absorbs collision energy through controlled deformation, resolving the contradiction between overall rigidity and local energy absorption.
3Strength
If multiple mounting members are used to distribute loads, then the bumper beam can withstand tensile loads better, but the device complexity increases
Solution Approach 1:
Each mounting member is designed with multi-functionality, serving both as a structural support element and as part of the load distribution system. The mounting members incorporate both rigid connection features for stability and integrated displacement promoting capabilities for energy absorption, reducing the need for additional specialized components and thereby limiting complexity increase.
Data Source
AI summary
A vehicle body structure includes a bumper beam extending in a vehicle width direction, and a pair of right and left bumper beam mounting members each disposed at an outer side in the vehicle width direction of a back face of the bumper beam and mounting the bumper beam on a front side frame. The bumper beam includes a first displacement promoting part that is provided at a mounting part for the bumper beam and the bumper beam mounting members and capable of promoting displacement of the bumper beam by a collision load. The bumper beam mounting member includes a second displacement promoting part that is provided at the mounting part and capable of promoting displacement of the bumper beam by a collision load.