S-Shaped Tire Tread Sipes for Stone Capture and Wear
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Solution Overview
Problem
Tire treads with sipes face issues of irregular wear and stone capture, which reduce traction effectiveness, cause damage, and pose safety hazards due to the traditional radially-oriented, straight sipes that allow stones to easily enter and lodge within the tread.
Innovation Solution
The implementation of sipes with an S-shaped geometry that varies in amplitude and wavelength along their radial height, featuring upper and lower vertical sections and curvilinear portions, which creates a more complex path that prevents stones from entering and reduces wear by increasing tread block stiffness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional straight sipes are added to increase traction, then more surface edges are created to engage the roadway, but block stiffness is reduced causing irregular wear patterns
Solution Approach 1:
The sipes are designed with a curvilinear or S-shaped geometry instead of straight lines. This curvature allows the sipes to provide multiple surface edges for traction while the curved path distributes stress more evenly across the tread block, preventing the excessive flexibility and irregular wear that occurs with straight sipes.
2Reliability
If traditional straight sipes are added to increase traction, then more surface edges are created to engage the roadway, but stones are easily captured in the sipes causing damage and safety hazards
Solution Approach 1:
The curvilinear or S-shaped geometry of the sipes creates a more complex internal path that is less likely to capture stones. The curved walls of the sipes deflect stones rather than providing a straight channel for them to lodge in, reducing stone capture while maintaining the traction-enhancing surface edges.
3Reliability
If sipes with constant wavelength are used, then traction is improved, but the design does not optimize both stone capture resistance and wear reduction simultaneously
Solution Approach 1:
The sipe geometry is designed with varying characteristics at different locations and depths. The wavelength and amplitude of the curvilinear or S-shaped sipes change along their length, allowing different sections to optimize for different functions: some sections provide traction edges while other sections are designed to deflect stones and reduce wear, creating locally optimized performance throughout the sipe structure.
Data Source
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AI summary
Various embodiments of a tire tread having at least one sipe comprising an S-shaped geometry are disclosed.