Pneumatic Tire Tread Groove Layout for Wet Traction and Block Rigidity
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Solution Overview
Problem
Heavy-duty pneumatic tires face challenges in maintaining block rigidity and heal-and-toe wear resistance due to the degradation of traction performance on wet road surfaces.
Innovation Solution
The pneumatic tire design includes circumferential main grooves in the inner half of the tread developed width, shoulder lug grooves that divide shoulder land portions, and center lug grooves that divide the center land portion into block portions. The center lug grooves feature end groove portions and a center groove portion on the tire equator line, with specific angles and depths to maintain block rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lug grooves extending in the tire lateral direction are provided to improve traction performance on wet road surfaces, then traction performance is improved, but block rigidity in the tire circumferential direction is degraded and heal-and-toe wear resistance performance deteriorates
Solution Approach 1:
The lug grooves are segmented into multiple parts: end groove portions extending in the tire lateral direction and a center groove portion extending in the tire circumferential direction. This segmentation allows the groove to provide drainage functionality while the angled configuration maintains block rigidity by preventing excessive deformation of the block portions.
Solution Approach 2:
The center groove portion is configured to extend at an angle different from the end groove portions, creating an asymmetric groove structure. This asymmetric design optimizes both drainage performance and block rigidity by directing water flow effectively while maintaining structural integrity of the tread blocks.
2Reliability
If deep grooves are provided to improve drainage performance, then traction performance on wet road surfaces is improved, but block rigidity is reduced leading to increased heal-and-toe wear
Solution Approach 1:
The groove configuration dynamically adapts to different regions of the tread: the end groove portions provide deep drainage channels at the edges, while the center groove portion has a different angle and depth to maintain block rigidity in the central region where heal-and-toe wear is most likely to occur.
Solution Approach 2:
Different portions of the lug grooves have different characteristics: the end groove portions are configured for maximum drainage, while the center groove portion is configured to balance drainage with block rigidity maintenance. This local differentiation allows optimization of both drainage performance and wear resistance.
Data Source
AI summary
A pneumatic tire includes two circumferential main grooves disposed in an inner half of a tread developed width in a tire lateral direction; shoulder lug grooves that divide shoulder land portions into shoulder block portions and that each include a see-through portion in the tire lateral direction; and center lug grooves that divide a center land portion into a plurality of center block portions. The center lug grooves each include: two end groove portions opening to the innermost circumferential main grooves and one center groove portion that extends between the end groove portions, has at least a part disposed on a tire equator line, and has an angle θ1 with respect to the tire equator line satisfying −45°≤θ1≤+15°.