Pneumatic Tire Tread Pattern for Wear and Stability Balance
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Solution Overview
Problem
All-season tires face challenges in achieving a balance between wear resistance on dry roads and steering stability on wet and snowy surfaces, with existing designs not adequately addressing these requirements simultaneously.
Innovation Solution
A pneumatic tire with a tread pattern featuring two outer circumferential main grooves, shoulder land portions with closed-off shoulder lug grooves, shoulder sipes, and narrow circumferential grooves, which provide a balanced design for wear resistance and steering stability across various road conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If shoulder lug grooves are made deeper to improve steering stability on wet and snowy roads, then steering stability is improved, but wear resistance on dry road surfaces deteriorates
Solution Approach 1:
The shoulder lug grooves are designed with different groove depths in different regions: deeper in the outer region (from tire edge to 50% of groove length) for improved steering stability on wet/snowy roads, and shallower in the inner region (from 50% to 100% of groove length) for improved wear resistance on dry roads. This local differentiation allows each region to optimize for its specific functional requirement.
Solution Approach 2:
The shoulder lug grooves are segmented into two distinct depth regions along their length. The outer region maintains deeper grooves to enhance steering stability in adverse conditions, while the inner region transitions to shallower grooves to reduce wear on dry surfaces. This segmentation enables the single groove structure to serve multiple conflicting functions simultaneously.
2Reliability
If shoulder lug grooves extend fully to outer circumferential main grooves to improve water evacuation, then wet steering stability is improved, but block rigidity deteriorates
Solution Approach 1:
The shoulder lug grooves extend partially toward the outer circumferential main grooves but terminate at 50-100% of their length rather than connecting fully. This partial extension is sufficient to evacuate water and improve wet steering stability while avoiding the complete connection that would compromise block rigidity. The grooves provide adequate drainage function without excessive action that would harm structural integrity.
Data Source
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AI summary
Provided is a pneumatic tire that exhibits a superior balance between wear resistance on dry road surfaces, and wet steering stability and steering stability on snow. A tread pattern includes two first circumferential main grooves, shoulder land portions, shoulder lug grooves, shoulder sipes, and narrow circumferential grooves, the shoulder lug grooves being closed off midway in the region of the shoulder land portions without connecting with the first circumferential main grooves and including first regions and second regions that are disposed in the regions closer to the first circumferential main grooves than the first regions and have a groove depth that is less than that of the first regions. The shoulder sipes are connected with the second regions and extend toward the first circumferential main grooves. The narrow circumferential grooves extend in the tire circumferential direction and have a groove width that is less than the groove width of the shoulder lug grooves. The narrow circumferential grooves intersect with the second regions of the shoulder lug grooves.