Pneumatic Tire Groove Offset Design for Winter Traction
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Solution Overview
Problem
Conventional winter tires experience partial wear, inadequate drainage, and compromised driving and braking performance due to timing discrepancies between adjacent block land portions and limited lateral grooves, which affect ground contact area and on-snow performance.
Innovation Solution
A pneumatic tire design featuring a rib-like central land portion row with circumferential grooves, lateral grooves extending between the central land portion and tread ends, and intermediate land portion rows with strategically positioned longitudinal grooves that reduce timing discrepancies and enhance ground contact, drainage, and on-snow performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the first block land portion and second block land portion have significantly different circumferential lengths, then the tire can be provided with lateral grooves at restricted positions, but the second block land portion is pulled by the first block land portion causing deformation and reducing ground contact area
Solution Approach 1:
The patent applies parameter changes by carefully controlling the circumferential lengths of block land portions and the spacing between them. Specifically, the first and second block land portions are designed with circumferential lengths and spacing that ensure their edge portions are released from the ground surface at substantially the same timing during tire rotation, preventing deformation and maintaining reliable ground contact area.
2Device complexity
If lateral grooves are extended from the tire equatorial plane side to each tread end at restricted positions, then the tire structure is simplified, but on-snow performance and drainage performance are insufficient
Solution Approach 1:
The patent applies segmentation by dividing the tread surface into multiple functional regions with different groove configurations. Lateral grooves are extended from the tire equatorial plane side to each tread end, while additional grooves are strategically positioned in intermediate regions. This segmentation allows the tire to achieve both structural simplicity and enhanced on-snow performance and drainage performance through optimized groove distribution.
Data Source
AI summary
A pneumatic tire, having in a tread surface thereof a pair of circumferential grooves formed on respective sides of the tire equatorial plane in the middle, a rib-like central land portion row demarcated by the circumferential grooves, and a plurality of lateral grooves extending between the central land portion row and each tread end, comprises in each half region of the tread: a row of first intermediate blocks each having a circumferential length D2 and demarcated by the lateral grooves, the corresponding circumferential groove, and first longitudinal grooves; and a row of second intermediate blocks demarcated by the lateral grooves, the first longitudinal grooves, and second longitudinal grooves, wherein facing openings of the first/second longitudinal grooves adjacent in the tire circumferential direction are offset from each other, and provided that D1 represents a circumferential distance between adjacent ends of the adjacent first and second intermediate blocks, D1≦D2/2.