Zigzag Center Tread Groove Layout for Wet Grip and Wear
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Solution Overview
Problem
Existing tire designs face challenges in achieving both wet performance and uneven wear resistance simultaneously, as configurations that improve drainage often compromise on rigidity and vice versa.
Innovation Solution
A tire design featuring a pair of shoulder main grooves and center main grooves with center land portions that include a circumferential narrow groove with a zigzag shape, connected by lateral grooves, enhancing drainage and rigidity while maintaining even wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a center land portion includes a circumferential narrow groove and lateral grooves to improve drainage, then wet performance is improved, but the rigidity of the center land portion deteriorates
Solution Approach 1:
The circumferential narrow groove is designed with a zigzag shape instead of a straight line, creating curved segments that improve drainage pathways while the angular geometry maintains structural rigidity. The zigzag pattern with alternating long and short portions provides drainage channels without compromising the land portion strength.
Solution Approach 2:
The groove configuration is optimized locally within the center land portion, with the zigzag circumferential narrow groove providing drainage specifically where needed while maintaining rigidity in other areas. The lateral grooves are positioned to connect at specific points along the zigzag pattern, creating localized drainage channels that do not compromise overall structural integrity.
2Ease of manufacture
If both first and second lateral grooves connect to one long portion from the left and right, then manufacturing is simplified, but the rigidity of the center land portion deteriorates and uneven wear resistance decreases
Solution Approach 1:
The first and second lateral grooves are configured to connect to different long portions of the zigzag circumferential narrow groove, creating an asymmetric pattern that enhances rigidity by distributing stress more effectively. This asymmetric configuration prevents concentration of weakness at a single connection point while maintaining manufacturability through standardized groove formation processes.
3Reliability
If the circumferential narrow groove has a zigzag shape with short portions between lateral groove connections, then drainage properties are improved, but the complexity of the groove configuration increases
Solution Approach 1:
The zigzag circumferential narrow groove is segmented into alternating long portions and short portions, with lateral grooves connecting at specific points. This segmentation creates multiple drainage pathways through the short portions while the long portions maintain structural continuity. The pattern is repetitive and systematic, making it manufacturable despite the increased geometric complexity.
Data Source
AI summary
Center land portions of a tire each include a circumferential narrow groove extending in a tire circumferential direction, and a first lateral groove opening to one edge portion of each of the center land portions at one end and connecting to the circumferential narrow groove at the other end, and a second lateral groove opening to the other edge portion of the center land portion at one end and connecting to the circumferential narrow groove at the other end. Further, the circumferential narrow groove has a zigzag shape formed by repeatedly connecting a first long portion, a first short portion, a second long portion, and a second short portion. Furthermore, the first lateral groove connects to the first long portion of the circumferential narrow groove having the zigzag shape, and the second lateral groove connects to the second long portion of the circumferential narrow groove having the zigzag shape.