Tread Block Corner Geometry for Wet Steering Stability
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Solution Overview
Problem
Existing tires lack improved wet steering stability performance on wet road surfaces, as their design does not effectively manage contact pressure and water drainage.
Innovation Solution
A tire design featuring a tread portion with specific block arrangements, including a leading-side corner with distinct first and second portions, varying groove widths, and chamfered features to enhance ground contact pressure uniformity and water drainage, thereby improving hydroplaning resistance and steering stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If chamfer portions are formed on block corner portions, then uniformity of ground contact pressure is improved, but wet steering stability performance deteriorates
Solution Approach 1:
The invention applies different chamfer configurations to different regions of the block corner portions. Specifically, the leading side corner portions have chamfer portions with first dimensions while the trailing side corner portions have chamfer portions with second dimensions that are smaller than the first dimensions. This local differentiation allows the leading side to achieve uniform ground contact pressure while the trailing side maintains better wet steering stability.
Solution Approach 2:
The block corner portions are segmented into distinct leading side and trailing side regions, each with independently optimized chamfer characteristics. This segmentation allows separate optimization of ground contact pressure uniformity (leading side) and wet steering stability (trailing side) without compromising either performance aspect.
2Reliability
If groove widths are increased for water drainage, then hydroplaning resistance is improved, but manufacturing complexity increases
Solution Approach 1:
The lateral grooves have different groove widths at different locations: the first groove widths at the leading side are larger than the second groove widths at the trailing side. This local differentiation optimizes water drainage efficiency at the leading side where hydroplaning risk is highest, while maintaining simpler manufacturing requirements at the trailing side.
Data Source
AI summary
A tire includes a tread portion including a row of blocks arranged in a tire circumferential direction divided by lateral grooves. Each block includes a block tread surface, a first block sidewall surface located on a leading side in a rotation direction of the block, and a leading-side corner portion between the block tread surface and the first block sidewall surface. The leading-side corner portion includes a first portion and a second portion extending in a tire axial direction. The first portion is formed sharper than the second portion. In a plan view of each block, an angle θ1 of the first portion to the tire circumferential direction is larger than an angle θ2 of the second portion to the tire circumferential direction. Each lateral groove has a groove width (A) at the first portion that is larger than a groove width (B) at the second portion.