Tire Tread Block Arrangement for Wear and Wet Traction
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Solution Overview
Problem
Heavy load tires experience excessive wear and deformation due to friction between the belt and tread portions, leading to reduced wear resistance and inadequate traction on wet surfaces, with existing solutions either increasing rigidity and risking breakage or failing to adequately suppress deformation.
Innovation Solution
The tire features a tread design with circumferential and lateral grooves that position block land portions to be displaced in the circumferential direction, with oblique groove portions and varying side wall angles to distribute stress and reduce sliding wear, while maintaining sufficient rigidity for improved traction on wet surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the rigidity of the block land portion is increased to suppress excessive collapsing and deformation, then wear resistance is improved, but the block land portion may break due to chip or crack
Solution Approach 1:
The groove portion is provided only between specific block land portions adjacent in the tire width direction, creating local structural differentiation. This allows the groove to reduce wear in critical areas while maintaining the integrity and rigidity of other block land portions, preventing breakage risk
Solution Approach 2:
The groove portion divides and separates adjacent block land portions in the tire width direction, creating independent stress zones. This segmentation prevents stress concentration across the entire tread width, allowing localized wear reduction without compromising overall structural strength
Data Source
AI summary
Provided is a tire exhibiting improved wear resistance, partial wear resistance, and traction performance on the wet road surface. The tire has block land portion arrays 5 defined on a tread portion 1. Between two block land portion arrays 5 located adjacent to each other while sandwiching a circumferential groove 2, a block land portions 4 constituting the block land portion arrays are arrange so as to be positionally displaced from each other, and a groove portion 6 located between the block land portions adjacent in the tire width direction extends obliquely with respect to tire width direction and the tire circumferential direction. At this time, a distance d2 between the block land portions adjacent in the tire width direction is shorter than a distance d1 between the block land portions adjacent in the circumferential direction. In the block land portion arrays 5 adjacent in the tire width direction, an inclined angle α of a side wall 9 of the block land portion 4 located on the groove portion 6 side with respect to the tire circumferential direction is larger than an inclined angle β of the other side wall 10 located on the opposite side to said groove portion 6 with respect to the tire circumferential direction.