Pneumatic Tire Land Portions With Segmented Groove Units
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Solution Overview
Problem
Pneumatic tires face a trade-off between wet performance and dry performance, as increasing groove area for better wet traction reduces tire rigidity and dry traction.
Innovation Solution
A pneumatic tire design featuring circumferential main grooves and land portions with sets of three grooves (first, second, and third grooves) that are radially spaced from 90 to 150 degrees, ensuring both wet and dry performance by maintaining land portion rigidity and effective drainage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the groove area of the land portion is increased to improve drainage effect and wet performance, then wet performance is improved, but the rigidity of the land portions decreases causing a decrease in dry performance
Solution Approach 1:
Each land portion is divided into multiple groove units, and each groove unit contains a set of three grooves (first, second, and third grooves) arranged at specific intervals. This segmentation allows the drainage function to be distributed across multiple smaller grooves rather than one large groove, maintaining land portion rigidity while ensuring effective water evacuation for wet performance
Solution Approach 2:
The patent applies different groove configurations to different regions of the tire tread. The first groove has a specific width range (1.5mm to 4.0mm) and semi-closed structure optimized for drainage, while the second and third grooves complement it to provide both wet traction through drainage and dry traction through maintained land portion rigidity. This local optimization allows different parts of the tread to serve different functions simultaneously
Data Source
AI summary
A pneumatic tire comprises circumferential main grooves extending in the tire circumferential direction and land portions defined by the circumferential main grooves. The land portions are each provided with a plurality of groove units which are sets including a first groove, a second groove, and a third groove. The first groove, the second groove, the third groove are disposed without meeting one another, and radially extend at intervals from each other ranging from 90 degrees to 150 degrees. Additionally, the first groove is a lug groove with the groove width ranging from 1.5 mm to 4.0 mm and has a semi-closed structure, opening to the circumferential main groove or the tire ground contact edge at a first end portion and terminating within the land portion at a second end portion.