Segmented Shoe Sole for Cycling Walking Trade-off
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Solution Overview
Problem
Conventional cycling shoes with hard soles provide rigidity for pedaling but hinder flexion when walking, making them uncomfortable for walking.
Innovation Solution
A shoe sole comprising a first layer made of a deformable material, such as foam, and a second layer that is more rigid, with the second layer's forefoot part bonded to the first layer to maintain rigidity during pedaling and allow for flexibility when walking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the sole is made hard to increase rigidity for pedaling, then energy loss during pedaling is reduced, but flexion when walking is hindered making it uncomfortable
Solution Approach 1:
The sole is divided into multiple layers with different rigidity characteristics. The first layer (sole body) is made of a soft, deformable material that allows flexion during walking, while the second layer (forefoot part) is made of a rigid material that maintains stiffness during pedaling. This segmentation resolves the contradiction by allowing different regions of the sole to have different mechanical properties optimized for different functions.
Solution Approach 2:
Different regions of the sole are assigned different material properties: the forefoot part (second layer) uses rigid material for pedaling efficiency, while the rest of the sole body (first layer) uses soft, deformable material for walking comfort. This local differentiation of material quality allows the sole to simultaneously provide rigidity where needed and flexibility where required.
2Power
If a single rigid layer is used for the sole, then pedaling efficiency is improved, but the sole cannot bend appropriately when walking
Solution Approach 1:
The sole is segmented into a first layer (sole body) and a second layer (forefoot part) with different thicknesses and material properties. The first layer provides flexibility and bending capability, while the second layer provides rigidity for power transfer during pedaling. This segmentation allows the sole to exhibit both flexible and rigid characteristics as needed.
Solution Approach 2:
The sole uses a composite structure combining a soft, deformable material (first layer) with a rigid material (second layer). This composite construction allows the sole to integrate materials with contrasting mechanical properties, achieving both flexibility for walking and rigidity for pedaling efficiency within a single sole structure.
Data Source
AI summary
A shoe sole is basically provided with a first layer and a second layer. The second layer is coupled to the first layer. The second layer has a forefoot part and a tarsal part. The forefoot part extends along the first layer and the tarsal part is configured to be displaceable relative to the first layer.