Bumper Reinforcement Joint Structure for Vehicle Crash Load Transmission
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Solution Overview
Problem
Existing vehicle body structures face challenges in efficiently transmitting collision loads from bumper reinforcements to side members without hindering compression deformation, leading to reduced bending rigidity and ineffective load absorption.
Innovation Solution
A joint structure is introduced, featuring a bumper reinforcement with a vertical wall and horizontal walls that are fastened to side members via extensions, preventing horizontal wall deformation and maintaining bending rigidity, while allowing compression deformation of the side members, and optionally using a bracket or dividing the bumper reinforcement into sections for optimized performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the bumper reinforcement is fastened to the front side member at multiple points to suppress deformation, then the bending rigidity is improved, but the compression deformation of the side member is hindered
Solution Approach 1:
The invention changes the fastening arrangement from multiple points along the side member to points distributed across the bumper reinforcement's cross-section. By fastening at both horizontal walls and the vertical wall of the bumper reinforcement, the structure achieves rigidity suppression of horizontal wall separation while avoiding interference with the side member's compression deformation in the vehicle front-rear direction.
Solution Approach 2:
The bumper reinforcement is divided into multiple fastening regions: both horizontal walls and the vertical wall. This segmentation allows different parts of the bumper reinforcement to serve different functions - the horizontal walls are fastened to prevent separation deformation, while the vertical wall fastening maintains load transmission paths without interfering with side member compression.
2Ease of operation
If the horizontal walls of the bumper reinforcement are allowed to deform, then the compression deformation of the side member is enabled, but the bending rigidity is reduced and collision load cannot be sufficiently transmitted
Solution Approach 1:
The fastening strategy targets the horizontal walls of the bumper reinforcement specifically, preventing their separation deformation while allowing the side member to undergo compression deformation in the vehicle front-rear direction. This dimensional differentiation resolves the contradiction between maintaining bumper reinforcement rigidity and enabling side member deformation.
3Ease of manufacture
If the bumper reinforcement uses a hat-shape open cross-section, then the manufacturing cost is reduced, but the collision load transmission is insufficient due to wall separation deformation
Solution Approach 1:
The horizontal walls of the bumper reinforcement are pre-fastened to the side member at specified positions before collision occurs. This preliminary fastening prevents the horizontal walls from separating during collision, maintaining the structural integrity and load transmission capability of the hat-shape open cross-section bumper reinforcement.
Solution Approach 2:
The fastening is applied at multiple locations across the bumper reinforcement cross-section (both horizontal walls and vertical wall), preventing deformation in the width direction while maintaining the open cross-section structure's manufacturing advantages.
Data Source
AI summary
A joint structure of a bumper reinforcement and a side member, the joint structure comprising: a bumper reinforcement that is provided at a vehicle front-rear direction end portion of a vehicle so as to extend in a vehicle width direction, and that includes: a vertical wall and a pair of horizontal walls; a left and right pair of side members that are respectively provided at the vehicle inner side of the bumper reinforcement so as to extend in the vehicle front-rear direction with leading ends of the side members fastened to the vertical wall of the bumper reinforcement; and fastening extensions that are provided at the respective leading ends of the side members, that project out toward a vehicle width direction outer side with respect to a respective side member, and that are fastened to at least one of the horizontal walls of the bumper reinforcement.