Running Shoe Midsole Isolation Cavities Arch Support
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Solution Overview
Problem
Modern running shoes face challenges in balancing cushioning, support, and energy return, particularly in controlling overpronation, which increases manufacturing costs and makes them unsuitable for normal running due to excessive firmness in the arch area.
Innovation Solution
A midsole design featuring a single material with a front isolation cavity, side cavity, and rear isolation cavity that allows the recessed arch portion to deform and regain shape, providing support for both normal and pronating feet without specialized equipment, using materials like PEBA, EVA, or TPU.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple materials are combined in the midsole to provide cushioning, support, and energy return, then the performance characteristics are improved, but the manufacturing cost increases
Solution Approach 1:
The patent changes the physical parameters of a single material (EVA) by controlling its density and durometer values in different regions of the midsole. The heel area uses higher density (0.30-0.40 g/cm³) and durometer (40-60 Shore A) for cushioning, while the arch area uses lower density (0.20-0.30 g/cm³) and durometer (30-50 Shore A) for support. This parameter variation within a single material system achieves multi-functional performance without the complexity and cost of multi-material construction.
2Ease of operation
If firm materials are used in the arch area to control overpronation, then the support function is improved, but the shoe becomes unsuitable for normal foot running
Solution Approach 1:
The patent applies local quality by creating region-specific material properties within the midsole. The arch area has reduced density (0.20-0.30 g/cm³) and durometer (30-50 Shore A) to provide gentle support that accommodates both normal and pronating feet, while the heel area maintains higher density (0.30-0.40 g/cm³) and durometer (40-60 Shore A) for impact absorption. This localized differentiation allows the single-material midsole to adapt to various foot types without excessive firmness in the arch region.
3Use of energy by moving object
If the midsole is designed with deep cutouts and recessed portions to allow bending and deformation, then the flexibility and energy return are improved, but the manufacturing complexity increases
Solution Approach 1:
The patent segments the midsole into distinct functional zones through deep cutouts and recessed portions rather than using multiple materials. The heel area, arch area, and forefoot area are separated by isolation cavities and recessed portions that allow independent deformation and energy storage/release cycles. This segmentation achieves the energy return function through geometric division of a single-material structure, avoiding the complexity of multi-material bonding and assembly processes.
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
Enhances athletic performance by offering desired cushioning and support for both normal and pronating feet, reducing manufacturing costs and maintaining flexibility, thus addressing the need for a cost-effective solution that functions for various running styles.
Implementation Method 1
The resiliency of the material of the midsole and the cavity surrounding the recessed arch portion allows the recessed arch portion to deform from a concave shape up to a flat profile under external pressure and regain its shape when the external pressure is removed
Data Source
AI summary
A midsole for sports shoes having a front isolation cavity, a side cavity, and a rear isolation cavity partially separating the recessed arch portion of the midsole from the rest of the midsole.