Fiber-Reinforced Crash Box Guide Section for Jamming Prevention
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Solution Overview
Problem
Conventional vehicular energy absorption structures face challenges in maintaining stable energy absorption characteristics due to positional misalignment and jamming of crushed portions during vehicle collisions, which impede progressive deformation and reduce energy absorption efficiency.
Innovation Solution
A vehicular energy absorption structure featuring a hollow tubular body made from fiber-reinforced resin with a guide section that includes an abutting section contacting the inner wall, separated by an opening, allowing crushed portions to escape and preventing jamming, thereby ensuring stable energy absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a guide section is provided inside the crash box to suppress positional misalignment, then positioning stability is improved, but crushed portions become jammed between the guide section and crash box wall, impeding progressive deformation and reducing energy absorption
Solution Approach 1:
The guide section is segmented into multiple parts: a guide portion with guide protrusions for positioning, and a separation portion with openings that allow crushed portions to pass through. This segmentation enables the guide section to perform multiple functions - maintaining positioning stability while preventing jamming of crushed portions, thus resolving the contradiction between positioning stability and energy absorption
Solution Approach 2:
The separation portion acts as an intermediary between the guide portion and the crushed portions. The openings in the separation portion provide escape paths for crushed portions, mediating between the positioning function of the guide protrusions and the need to prevent jamming, thereby maintaining both positioning stability and energy absorption capability
2Reliability
If the abutting section contacts the crash box wall directly without openings, then positioning is more effective, but crushed portions cannot escape and jam between the abutting section and wall, creating orthogonal load
Solution Approach 1:
The abutting section is segmented to include both contact surfaces for positioning and openings for crushed portion escape. This segmentation allows the abutting section to maintain reliable positioning through wall contact while simultaneously providing escape paths that prevent jamming and orthogonal load generation
Solution Approach 2:
Different regions of the abutting section have different qualities: some regions have solid contact surfaces with the crash box wall for reliable positioning, while other regions have openings to allow crushed portion passage. This local differentiation of quality enables the abutting section to fulfill both positioning and anti-jamming functions simultaneously
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 solution effectively suppresses positional misalignment and jamming, enabling stable energy absorption characteristics by allowing crushed portions to pass through openings, thus preventing load input orthogonal to the axis and maintaining progressive deformation.
Implementation Method 1
During a vehicle collision, the energy absorption body is crushed from the axial direction end portion. Collision energy is absorbed thereby.
Implementation Method 2
Collision energy is absorbed thereby
Data Source
AI summary
A vehicular energy absorption structure includes a hollow tubular energy absorption body made from a fiber reinforced resin, an opposing face (e.g., an attachment plate) that is provided facing an axial direction end portion of the energy absorption body, and against which the energy absorption body is crushed from the axial direction end portion during a vehicle collision, and a guide section (e.g., peripheral wall, ribs) that projects from the opposing face and that is disposed in an interior of the energy absorption body. The guide section includes an abutting section (e.g., abutting walls) that contacts a wall of the energy absorption body from the inner side of the wall during the vehicle collision, the abutting section being separated from the opposing face by an opening in the axial direction of the energy absorption body.