Variable Width Sipe Geometry for Winter Tire Traction
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Solution Overview
Problem
Current vehicle tire tread profiles face challenges in achieving improved winter properties, wet and dry braking performance, as existing fine incisions do not effectively accommodate snow and water, leading to suboptimal traction and braking capabilities.
Innovation Solution
A tread profile with Ω-shaped fine incisions featuring alternating sections of normal and greater width, ensuring interlocking and deformation that maintains open areas for snow accommodation and water absorption, enhancing snow-snow friction and wet braking, while maintaining edge integrity for dry braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fine incisions with uniform width are used in tread blocks, then the structure is simple and manufacturing is easy, but snow accommodation and water drainage capabilities are insufficient
Solution Approach 1:
The fine incisions feature variable width along their longitudinal extent, with at least one section having greater width than others. This local variation creates specific functional zones: narrower sections provide structural integrity while wider sections enhance snow accommodation and water drainage capabilities, directly improving winter and wet driving performance without requiring complete geometric redesign
Solution Approach 2:
The fine incisions are divided into multiple sections along their longitudinal extent, with each section having different width characteristics. This segmentation allows different portions to perform specialized functions - some sections optimized for snow retention while others facilitate water evacuation, thereby improving overall reliability across multiple driving conditions
2Reliability
If fine incisions close during deformation, then edge integrity is maintained, but snow and water accommodation is lost
Solution Approach 1:
Specific sections of the fine incisions are designed with greater width to prevent complete closure during tread deformation. These wider zones act as permanent channels that maintain snow and water accommodation capabilities even when the tread block is under load, while narrower sections maintain sufficient structural strength
Solution Approach 2:
The variable width geometry is pre-designed into the fine incisions before the tire encounters snow or water. The wider sections are positioned and dimensioned in advance to ensure they remain open during deformation, proactively maintaining accommodation capability rather than relying on post-deformation recovery
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 enhanced tread profile provides improved winter driving characteristics, increased snow adhesion, and superior wet and dry braking properties by maintaining open areas for snow and water absorption, and ensuring edge integrity during deformation.
Implementation Method 1
As the tire passes over the road surface, the profile elements of the tread strip deform. The type and intensity of this deformation is determined, among other things, by the geometry of the fine incisions arranged in this profile element.
Implementation Method 2
Snow can be accommodated in this opening for good driving characteristics on wintry roads, as a result of which the advantageous snow-snow friction and thus advantageous adhesion is achieved.
Implementation Method 3
the openings are advantageous on wet roads because water can be absorbed in these openings
Implementation Method 4
The interlacing is obtained through mutual supporting effects, in particular the bulging, of opposing sipe walls.
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
The tread profile (1) has the profile blocks or tread strip bands (3) that are provided with the fine incision portions (2). The two axial sections (5,6) are formed in the fine incision portions along a common imaginary straight line at spacing (a). A central protrusion portion (7) with maximum extension (b), is formed between the axial sections. The spacing is set less than the maximum extension so that the undercuts are formed. The fine incision portions are provided with large width at specific regions.