Vehicle Impact Absorber with Breaking Induction for Stable Energy Dissipation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Vehicle impact absorbing members with hollow double-wall structures experience fluctuations in impact absorption performance due to air compression and temperature variations, affecting load values and stability.
Innovation Solution
A vehicle impact absorbing member is formed by blow molding with a hollow structure, featuring recessed columns and a breaking induction portion on its walls, facilitating early surface breaking to release internal air and maintain stable performance across a wide temperature range, using a thermoplastic resin polymer alloy of polyolefin and amorphous resins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a hollow double-wall structure is used to improve impact absorption, then energy absorption capacity is improved, but air compression inside the hollow portion causes fluctuations in load value and reduces impact absorption performance
Solution Approach 1:
The breaking induction portion is pre-formed on the wall surface to initiate controlled breaking at a specific location before the hollow portion is fully compressed. This preliminary structural feature ensures that the wall breaks open early in the impact process, allowing air to escape before compression can cause performance fluctuations.
Solution Approach 2:
The air trapped inside the hollow portion, which initially causes harmful pressure fluctuations, is converted into a beneficial element. By controlling the breaking location, the air escape process itself becomes part of the energy absorption mechanism, with the air rushing out creating a controlled pressure release that stabilizes the load curve during impact.
2Strength
If polypropylene resin with high bend elastic modulus is used to improve structural strength, then impact resistance is improved, but temperature variations cause stress variation and reduce impact absorption performance
Solution Approach 1:
The breaking induction portion changes the structural parameters of the wall by creating a localized weakness. This feature ensures that breaking occurs at a predictable location regardless of temperature-induced stress variations, making the impact absorption performance less sensitive to temperature changes while maintaining the high strength properties of the polypropylene resin.
3Strength
If the wall surface is made strong to improve impact resistance, then structural integrity is improved, but breaking becomes difficult and air compression influence increases
Solution Approach 1:
The wall structure is given non-uniform local quality through the breaking induction portion. The wall maintains high strength in most areas for impact resistance, while having a localized region with reduced strength or increased flexibility at the breaking induction portion. This allows the overall structure to remain strong while enabling controlled breaking at the specific location to release air compression.
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 ensures stable impact absorption performance by preventing air compression and maintaining consistent load values independent of temperature, enhancing the impact absorbing capability of vehicle structural members.
Implementation Method 1
a vehicle impact absorbing member... for absorbing impact from an interior portion of the vehicle
Implementation Method 2
the impact absorbing member is formed from a thermoplastic resin
Implementation Method 3
air present inside the hollow portion of the impact absorbing member is compressed thereby to increase internal pressure
Implementation Method 4
a breaking induction portion formed on a wall constituting the impact absorbing member... part of the wall surface of the impact absorbing member is early broken to be open
Data Source
AI summary
Provided is a shock absorber for a vehicle, which, when it is crushed, can break and open a part of the wall thereof earlier than the time of the break of an explosion inducing section, to thereby exclude the effect of the air being present inside a hollow portion and exhibit stable shock-absorbing capability and also maintain a satisfactory shock-absorbing capability over a wide range of temperature from a high temperature to a low temperature independently of the temperature of the open air. A shock absorber (1) is a hollow structure integrally molded through blow molding. The shock absorber (1) has at least one explosion inducing section (12). The explosion inducing section (12) comprises a protruded ridge (13) in a notch form formed on the surface of the wall of the shock absorber (1). The shock absorber (1) comprises a thermoplastic polymer alloy of a polyolefin type resin and an amorphous resin.