Tire Tread Sipe Density Layout for Snow Grip and Dry Rigidity
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Solution Overview
Problem
Existing all-season tires face a challenge in improving on-ice/on-snow performance without compromising dry performance, as increasing sipe density can reduce tread rigidity and impair dry performance.
Innovation Solution
A tire design featuring specific arrangements of oblique and longitudinal grooves with varying sipe densities in crown, shoulder, and middle blocks, ensuring SDc>SDs and SDm>SDs, maintains rigidity in shoulder blocks for dry performance while enhancing friction in middle and crown blocks for on-ice/on-snow performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If more sipes are provided in the land regions of the tread portion, then on-ice/on-snow performance is improved, but rigidity of the land regions is excessively decreased, impairing dry performance
Solution Approach 1:
The patent applies local quality by differentiating sipe density across different block regions. Crown blocks have higher sipe density for snow/ice grip, while shoulder blocks have lower or zero sipe density to maintain rigidity for dry performance. This localized differentiation allows each region to optimize for its specific function without compromising overall tire performance.
Solution Approach 2:
The tread portion is segmented into distinct block regions (crown blocks, shoulder blocks, middle blocks) with different sipe density characteristics. This segmentation allows independent optimization of each region - crown blocks can have aggressive siping for snow performance while shoulder blocks maintain structural integrity for dry road stability.
2Reliability
If sipe density is increased to improve on-ice/on-snow performance, then traction on snow and ice is enhanced, but dry performance is impaired due to excessive rigidity decrease
Solution Approach 1:
Different sipe densities are assigned to different functional zones: crown blocks (high density) for snow/ice traction, shoulder blocks (low/zero density) for dry road stability. This local quality approach ensures that sipe density optimization for one condition does not degrade performance in another condition.
3Reliability
If uniform high sipe density is applied across all blocks, then on-ice/on-snow performance is maximized, but uneven wear occurs and dry performance deteriorates
Solution Approach 1:
The patent implements non-uniform sipe density distribution across different block types. Crown blocks have high sipe density for snow performance, while shoulder blocks have reduced or zero siping. This deliberate non-uniformity prevents uneven wear patterns and maintains performance stability across different road conditions.
Solution Approach 2:
The tread is divided into functional segments with differentiated sipe characteristics. This segmentation prevents the uniform high sipe density that causes uneven wear, allowing each segment to contribute appropriately to overall tire performance and wear characteristics.
Data Source
AI summary
A tire has a tread portion provided with grooves including first oblique grooves, second oblique grooves, first shoulder longitudinal grooves, and first crown longitudinal grooves. Each first oblique groove terminates in conjunction with one of the second oblique grooves. Each second oblique groove terminates in conjunction with one of the first oblique grooves. The blocks include crown blocks, first shoulder blocks, and first middle blocks. Each block has a ground contacting surface provided with sipes. A sipe density SDc of each crown block, a sipe density SDm of each first middle block, and a sipe density SDs of each first shoulder block satisfy SDc>SDs and SDm>SDs.