Asymmetric Tread Land Layout for Dry-Road Steering Stability
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Solution Overview
Problem
Existing tires face challenges in maintaining steering stability on dry roads, particularly due to the configuration of crown land and middle land portions which do not effectively distribute contact pressure.
Innovation Solution
A tire design featuring a tread portion with specific land portion configurations, including a crown land portion and two middle land portions, where the widths of these land portions follow a specific ratio (W1m > Wc > W2m) and the outer ground contact surface is wider than the inner surface, enhancing rigidity and cornering force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the crown land portion and middle land portions are made wider to improve steering stability, then the contact pressure distribution improves, but the tire noise increases due to larger ground contact area
Solution Approach 1:
The patent applies local quality by creating asymmetric width distribution among different land portions. Specifically, the first middle land portion has a larger width than the crown land portion, which in turn is wider than the second middle land portion (W1m > Wc > W2m). This localized variation in width allows optimized contact pressure distribution for steering stability while controlling overall noise generation.
Solution Approach 2:
The patent employs asymmetry in the land portion configuration, particularly making the first middle land portion (on the outer side) wider than the second middle land portion (on the inner side). This asymmetric design (W1m > W2m) optimizes the contact pressure distribution during cornering, enhancing steering stability while managing noise characteristics.
2Force
If the outer ground contact surface is made wider than the inner surface to enhance cornering force, then steering response improves, but the rigidity distribution becomes unbalanced
Solution Approach 1:
The patent applies local quality by creating asymmetric width distribution among different land portions. Specifically, the first middle land portion has a larger width than the crown land portion, which in turn is wider than the second middle land portion (W1m > Wc > W2m). This localized variation in width allows optimized contact pressure distribution for steering stability while controlling overall noise generation.
Solution Approach 2:
The patent employs asymmetry in the land portion configuration, particularly making the first middle land portion (on the outer side) wider than the second middle land portion (on the inner side). This asymmetric design (W1m > W2m) optimizes the contact pressure distribution during cornering, enhancing steering stability while managing noise characteristics.
Data Source
AI summary
A tire includes a tread portion including first and second tread edges, circumferential grooves, and land portions. The land portions include a crown land portion, a first middle land portion, and a second middle land portion. Under a 50% loaded condition, the first middle land portion, the crown land portion, and the second middle land portion respectively have axial widths W1m, Wc, and W2m of ground contact surfaces, the widths satisfying the following formula, W1m>Wc>W2m. The crown land portion includes an outer ground contact surface and an inner ground contact surface. The outer ground contact surface and the inner ground contact surface respectively have widths Wco and Wci in the tire axial direction, the widths satisfying the following formula, Wco>Wci.