Vehicle Collision Energy Absorber with Shear Guide Mechanism
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Solution Overview
Problem
Existing collision energy absorbing apparatuses fail to effectively suppress peak loads at the initial stage of a collision and subsequent load drops, as demonstrated by the load variation curve in Japanese Unexamined Patent Application Publication No. 2011-63191.
Innovation Solution
A collision energy absorbing apparatus is designed with a guide part that directs a pressure member to enter a hole in an absorbing member, causing the pressure member's tip to shear the inner wall of the hole, thereby absorbing collision energy. This apparatus includes an alignment member, a pressure member with a larger diameter than the hole, and a guide rod, ensuring proper alignment and energy absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a hollow part is formed by providing a reinforcing plate on the inner surface of a rectangular steel cylinder, then the load drop immediately after peak load is suppressed, but the peak load at the initial stage of collision increases
Solution Approach 1:
The absorbing member is divided into multiple hollow parts (first hollow part, second hollow part, etc.) with different cross-sectional shapes along the longitudinal direction. This segmentation allows each hollow part to contribute differently to load absorption, suppressing peak load while maintaining load stability during collision.
Solution Approach 2:
Different sections of the absorbing member have different local structures - some sections have hollow parts while others have solid portions, and the hollow parts have varying cross-sectional shapes. This local quality variation enables the structure to suppress peak load at critical locations while maintaining overall load stability.
2Stability of the object's composition
If the hollow part diameter is reduced to suppress load drop, then load stability improves, but the peak load at initial collision stage increases
Solution Approach 1:
The absorbing member is divided into multiple hollow parts with different cross-sectional shapes (circular, rectangular, elliptical, etc.) arranged along the longitudinal direction. This segmentation allows the structure to achieve load stability through varied deformation characteristics while maintaining adequate volume distribution to control peak load.
Solution Approach 2:
The hollow parts have asymmetric cross-sectional shapes rather than uniform circular sections. This asymmetry creates different deformation modes in different sections, enabling the structure to suppress load drop and stabilize the load curve while optimizing volume utilization to prevent excessive peak load.
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 apparatus successfully suppresses peak loads at the initial stage of a collision and prevents load drops immediately after, achieving efficient collision energy absorption while maintaining a compact and lightweight design.
Implementation Method 1
the tip part of the pressure member enters the hole formed in the absorbing member so as to shear an inner wall of the hole, to thereby absorb collision energy
Data Source
AI summary
The present disclosure provides a collision energy absorbing apparatus capable of suppressing a peak load at the initial stage of a collision and a load drop immediately after it. The collision energy absorbing apparatus is an apparatus that absorbs collision energy, the apparatus being mounted on a vehicle and including a pressure member, an absorbing member, and a guide part that guides, a moving direction of the pressure member, in which a hole through which the pressure member guided and moved by the guide part enters is formed in the absorbing member, and in an event of a collision, the pressure member is guided by the guide part and a tip part of the pressure member enters the hole formed in the absorbing member while shearing an inner wall of the hole, to thereby absorb collision energy.