Shock absorber, shoe sole and shoe
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Solution Overview
Problem
Conventional shock absorbers with increased compressive stiffness face challenges of increased weight and stress concentration due to added thickness, which compromises their durability and weight reduction goals, especially when trying to enhance local stiffness or use in various applications.
Innovation Solution
A shock absorber with a three-dimensional structure composed of unit structures arranged in a specific pattern, featuring a differently shaped portion in the shock absorbing region to enhance compressive stiffness without increasing overall weight, and incorporating a triply periodic minimal surface with a meandering portion and reinforcement at turning points to mitigate stress concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If wall thickness is increased to achieve large compressive stiffness, then compressive stiffness is improved, but weight is significantly increased
Solution Approach 1:
The patent applies local quality by providing a differently shaped portion at specific locations within the unit structure. This allows certain regions to have enhanced compressive stiffness without requiring the entire structure to have increased wall thickness, thereby achieving local reinforcement while maintaining overall lightweight characteristics.
Solution Approach 2:
The patent introduces a differently shaped portion that extends in a direction intersecting the axial direction (the primary compression direction). This dimensional approach allows the structure to achieve enhanced stiffness through geometric configuration rather than simply increasing wall thickness, effectively utilizing spatial arrangement to improve mechanical properties without proportional weight increase.
2Strength
If wall thickness is increased to achieve large compressive stiffness, then compressive stiffness is improved, but the shock absorber's weight is significantly increased
Solution Approach 1:
The patent applies local quality by providing a differently shaped portion at specific locations within the unit structure. This allows certain regions to have enhanced compressive stiffness without requiring the entire structure to have increased wall thickness, thereby achieving local reinforcement while maintaining overall lightweight characteristics.
Solution Approach 2:
The patent introduces a differently shaped portion that extends in a direction intersecting the axial direction (the primary compression direction). This dimensional approach allows the structure to achieve enhanced stiffness through geometric configuration rather than simply increasing wall thickness, effectively utilizing spatial arrangement to improve mechanical properties without proportional weight increase.
3Strength
If thickness is added to triply periodic minimal surface to achieve large compressive stiffness, then compressive stiffness is improved, but stress concentration is locally caused
Solution Approach 1:
The patent applies curvature by designing the differently shaped portion with rounded surfaces rather than sharp corners. This geometric modification eliminates stress concentration points that would otherwise occur at sharp edges or corners, thereby improving durability while maintaining the enhanced compressive stiffness provided by the additional thickness.
Solution Approach 2:
The patent applies local quality by providing a differently shaped portion at specific locations within the unit structure. This allows certain regions to have enhanced compressive stiffness without requiring the entire structure to have increased wall thickness, thereby achieving local reinforcement while maintaining overall lightweight characteristics.
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 results in a lightweight shock absorber with excellent shock absorption and durability, suitable for various applications, by achieving high compressive stiffness without weight increase and reducing stress concentration through its unique structural design.
Implementation Method 1
a shock absorber which is lightweight and has an excellent shock absorbing function... achieved large compressive stiffness more easily than a shock absorber including a part having a lattice structure
Implementation Method 2
a shock absorber which has an excellent shock absorbing function and is also excellent in durability... due to the structure, stress concentration is locally caused when an external force is received. The local stress concentration causes a decrease in durability
Data Source
AI summary
A shock absorber includes a three-dimensional structure composed of a unit structure repeatedly, regularly and continuously arranged in at least one direction, the unit structure being a three-dimensional shape formed by a wall having an external shape defined by a pair of parallel planes or curved surfaces. In the shock absorber, a differently shaped portion which does not correspond to the wall defining the unit structure is locally provided in a shock absorbing region which is a region in which the three-dimensional structure has the unit structure disposed.