Studless Tire Tread Groove Layout for Snow Grip and Steering Stability
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Solution Overview
Problem
Existing studless tires face challenges in achieving both good performance on snow and steering stability on ice and snow in a compatible manner, as increasing groove area improves snow performance but decreases steering stability, and vice versa.
Innovation Solution
A pneumatic tire design featuring a first main groove with a bent portion and second land portion lug grooves that connect to the first main groove, allowing for increased snow compaction and improved steering stability by optimizing the groove area and intersection points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the groove area of the tread pattern is increased to improve performance on snow, then snow performance is improved, but steering stability deteriorates
Solution Approach 1:
The first main groove is segmented into multiple groove sections along the tire circumferential direction, with each section having a different bent portion configuration. This allows different regions to contribute differently to snow performance while maintaining overall steering stability through the distributed groove structure.
Solution Approach 2:
Different groove sections have locally optimized bent portion configurations (different positions, angles, and depths) to create varying degrees of snow compaction capability in different tire regions, while the overall groove area is controlled to maintain steering stability.
2Stability of the object's composition
If the groove area is decreased to improve steering stability, then steering stability is improved, but performance on snow deteriorates
Solution Approach 1:
The bent portions are configured to provide dynamic snow compaction capability during tire rotation and deformation, allowing the groove structure to adaptively engage with snow during braking and turning while maintaining steering stability during normal operation.
Solution Approach 2:
The groove depth, width, and bent portion angles are optimized within specific parameter ranges to maximize snow compaction efficiency per unit groove area, thereby improving snow performance without requiring excessive groove area that would compromise steering stability.
3Reliability
If a bent portion with acute bend angle is formed in the first main groove to increase shear force in snow, then performance on snow is improved, but block rigidity may be reduced
Solution Approach 1:
The bent portions are positioned at specific locations within the groove sections rather than uniformly throughout, providing localized snow compaction action where most needed while preserving block rigidity in other critical regions of the tread pattern.
Solution Approach 2:
The groove structure combines rigid land portions with flexible bent portion configurations, creating a composite tread pattern that exhibits both the snow compaction capability of flexible elements and the steering stability of rigid structural components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The tire achieves enhanced performance on snow and improved steering stability on ice and snow by increasing the shear force in snow without reducing block rigidity, thus providing a compatible solution to the traditional trade-offs.
Implementation Method 1
allowing for increased snow compaction and improved steering stability by optimizing the groove area and intersection points
Implementation Method 2
To increase the adhesive friction force, a flexible rubber is used in the studless tire
Data Source
AI summary
A pneumatic tire includes: a center main groove extending in a tire circumferential direction; a center land portion defined by the center main groove; a second land portion adjacent to the center land portion across the center main groove; and a second lug groove extending from the center main groove toward the second land portion in a tire lateral direction and defining the second land portion together with the center main groove; the center main groove including a center side edge portion corresponding to an edge portion on the center land portion side, the center side edge portion including a bent portion formed bent in a direction outwards in a groove width direction of the center main groove with an acute bend angle; and the second lug groove including an opening portion to the center main groove connected to the center main groove at a position opposing the bent portion.