Pneumatic Tire Tread Groove Configuration for Wet Grip and Wear
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Solution Overview
Problem
Existing pneumatic tires face challenges in achieving compatible good steering stability, wear resistance, and wet performance due to the trade-off between groove area ratio and tire rigidity, where increasing groove area ratio for wet performance can lead to decreased steering stability and wear resistance.
Innovation Solution
A pneumatic tire design featuring a tread portion with specific main and narrow grooves configurations, including vehicle center and side main grooves, land portions with narrow grooves that open and terminate at strategic angles, and communicate with each other, maintaining a balanced groove area ratio to enhance drainage and rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the groove area ratio is increased to improve wet performance, then drainage properties are improved, but the rigidity of the land portion decreases
Solution Approach 1:
The patent applies local quality by creating different groove configurations in different regions of the tread surface. Specifically, the grooves in the shoulder land portion have different characteristics (depth, width, orientation) compared to grooves in the center land portion, allowing each region to be optimized for its specific functional requirements while maintaining overall tire performance balance
Solution Approach 2:
The tread surface is segmented into multiple land portions (shoulder land portion and center land portion) with distinct groove patterns. This segmentation allows independent optimization of drainage characteristics in different areas, enabling the tire to achieve good wet performance without compromising overall structural rigidity
2Reliability
If the groove area ratio is increased to improve wet performance, then drainage properties are improved, but steering stability decreases
Solution Approach 1:
Different groove configurations are implemented in different tread regions to balance wet performance and steering stability. The shoulder land portion features grooves optimized for water evacuation, while the center land portion maintains a pattern that preserves steering response and stability, thus achieving both wet performance and steering stability simultaneously
3Reliability
If the groove area ratio is increased to improve wet performance, then drainage properties are improved, but wear resistance decreases
Solution Approach 1:
The patent implements local quality by varying groove depth, width, and orientation in different tread regions. The shoulder land portion has grooves configured for effective water drainage, while the center land portion uses a different configuration that maintains wear resistance, thereby achieving good wet performance without compromising overall tire durability
Data Source
AI summary
A pneumatic tire comprises main grooves extending in the tire circumferential direction. Grooves in vehicle inner and outer side center land portions are all narrow grooves. Vehicle inner side center land portion narrow grooves open to a vehicle center main groove at a first end, open to a vehicle inner side main groove at a second end, and bend in a tire circumferential direction. The narrow grooves in the vehicle outer side center land portion comprise vehicle outer side center land portion outer narrow grooves that open to a vehicle outer side main groove at a first end and terminate within the vehicle outer side center land portion at a second end and vehicle outer side center land portion inner narrow grooves that open to the vehicle center main groove at a first end and terminate within the vehicle outer side center land portion at the second end.