Tire Tread Groove Structure Balancing Snow Grip and Uneven Wear
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Solution Overview
Problem
Conventional tires face challenges in improving snow performance while maintaining uneven wear resistance, as increasing groove volume to enhance snow traction leads to reduced land portion rigidity and increased uneven wear.
Innovation Solution
A tire design featuring three circumferential main grooves, lug grooves, and land portions with narrow shallow grooves that open to the main grooves, having specific depth and width ratios, and a zigzag shape to enhance snow traction while minimizing uneven wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If groove volume is increased to improve snow performance, then snow column shear force increases, but land portion rigidity decreases
Solution Approach 1:
The invention segments the groove structure into multiple types (circumferential main grooves, radial grooves, lateral grooves, and sipes) with different functions and depths. The circumferential main grooves have greater depth for snow retention, while radial and lateral grooves have smaller depths to preserve land portion rigidity. This segmentation allows the tire to achieve snow performance through distributed groove structures rather than uniform deep grooves.
Solution Approach 2:
The invention applies different groove depths and configurations to different regions of the tread. The circumferential main grooves extending in the tire circumferential direction have greater depth for effective snow retention, while radial grooves and lateral grooves have smaller depths. This local differentiation optimizes snow performance in critical areas while maintaining overall land portion rigidity.
2Reliability
If groove volume is increased in block pattern, then snow performance improves, but block rigidity decreases remarkably
Solution Approach 1:
The invention segments the groove system into circumferential main grooves that define block patterns and radial/lateral grooves that provide additional drainage. The circumferential main grooves with greater depth retain snow within block patterns, while the smaller radial and lateral grooves provide drainage without significantly reducing block rigidity. This segmented approach allows snow performance improvement while preserving block structural integrity.
Solution Approach 2:
The invention applies partial action by providing sufficient groove depth in circumferential main grooves for effective snow retention, while using smaller depths for radial and lateral grooves. This partial differentiation ensures that snow performance is achieved through the primary circumferential grooves without the excessive groove volume that would significantly reduce block rigidity.
Data Source
AI summary
A tire includes circumferential main grooves, lug grooves, and land portions defined by the circumferential main grooves and the lug grooves. The circumferential main grooves extend in a circumferential direction. The lug grooves extend in a width direction, include shoulder and center lug grooves, and have an end opening to a circumferential main groove. Narrow shallow grooves in center and shoulder land portions have an end opening to a circumferential main groove and have a groove depth of 10-40% of a circumferential main groove depth. The shoulder lug grooves are on an outer side of a shoulder main groove in the width direction and have an end opening to the shoulder main groove. The center lug grooves are between the center and shoulder main grooves, have both ends opening to circumferential main grooves, and have a minimum width wider than a minimum width of the shoulder lug groove.