Pneumatic Tire Tread Pattern for Snow and Dry Stability
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Solution Overview
Problem
Conventional pneumatic tires face a trade-off between achieving good snow performance and maintaining steering stability on dry roads, as features that enhance snow traction often compromise dry road handling and steering stability.
Innovation Solution
The pneumatic tire design incorporates specific tread patterns with five land parts, including middle and shoulder land parts with sub-grooves and lug grooves that intersect the tire's circumferential direction, providing both drainage characteristics for snow and increased rigidity for improved steering stability on dry roads, along with auxiliary grooves to enhance drainage and noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sub-grooves and sipes are formed in land parts to improve snow performance, then drainage characteristics for snow are enhanced, but block rigidity decreases and steering stability performance on dry roads deteriorates
Solution Approach 1:
The invention segments the grooves into two distinct types: main grooves that extend in the tire circumferential direction to maintain block rigidity and steering stability, and sub-grooves that extend in the tire width direction to provide drainage characteristics for snow. This segmentation allows each groove type to fulfill its specific function without compromising the other.
Solution Approach 2:
The invention applies different groove configurations to different regions of the tread. Land parts are provided with both main grooves (circumferential) and sub-grooves (width direction), creating local variations in groove density and orientation that optimize both snow drainage and dry road steering stability.
2Strength
If groove surface area ratio is decreased in center and shoulder land parts to improve steering stability on dry roads, then rigidity of these land parts is enhanced, but snow performance may be compromised
Solution Approach 1:
The groove system is segmented into main grooves for structural integrity and sub-grooves for snow drainage. By separating these functions into different groove orientations, the invention maintains rigidity while preserving snow performance.
Solution Approach 2:
The invention adds a new dimension to the groove configuration by introducing sub-grooves that extend in the tire width direction, perpendicular to the main grooves. This dimensional addition enables snow drainage functionality without compromising the circumferential groove structure that provides rigidity.
Data Source
AI summary
A pneumatic tire with five land parts formed by four circumferential main grooves wherein middle land parts each include a first sub groove and a second sub groove that are formed independently and arranged alternately in the tire circumferential direction on two sides of the middle land part in the tire width direction, the first sub groove being formed by the lug groove having one end thereof opening to one of the circumferential main grooves and the other end terminating in the middle land part, the second sub groove being formed by the lug groove having one end thereof opening to one of the circumferential main grooves and the other end terminating in the middle land part, and the middle land part further includes a concave part on a wall on an outer side of the middle land part in the tire width direction and spaced by each sub groove.