Tyre Tread Groove Layout for Snow Compression and Trapping
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Solution Overview
Problem
Existing snow tires with T-points and zigzag circumferential grooves lack performance in snow compression, particularly in soft or mid-hardness snow conditions, affecting traction, braking, and handling.
Innovation Solution
The tire design features grooves with a minimum width of at least 2.0 mm at the snow compression zone, intersecting grooves to enhance snow compression, and specific groove dimensions and angles to optimize snow flow and trapping, including a groove starting width of about 3.4 mm for improved snow performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the groove width is less than 2.0mm, then the tread pattern can maintain structural integrity and reduce manufacturing complexity, but snow flow into the snow compression zone is insufficient leading to reduced snow compression performance
Solution Approach 1:
The patent specifies a minimum groove width of 2.0mm at the snow compression zone to optimize snow flow while maintaining structural integrity. This parameter change ensures sufficient snow can flow into the compression zone without compromising the tread's structural strength or manufacturing feasibility.
2Reliability
If grooves are made wider to increase snow flow, then snow compression performance improves, but the groove becomes too large compared to the snow compression zone size reducing compression efficiency
Solution Approach 1:
The patent optimizes the groove width parameter to a specific range (at least 2.0mm but at most 7.0mm) to achieve the right balance. This parameter optimization ensures the groove is wide enough to allow sufficient snow flow while remaining proportionate to the snow compression zone size, maintaining compression efficiency.
3Reliability
If grooves converge to form a snow compression zone, then snow trapping is enhanced, but the tread pattern complexity increases
Solution Approach 1:
The tread pattern is segmented into multiple grooves (6 or more) that converge to form a snow compression zone. This segmentation allows snow to be channeled through multiple pathways into the compression zone, enhancing snow trapping while distributing the complexity across multiple simple groove elements rather than one complex structure.
4Reliability
If T-points are used to compress snow, then snow compression is achieved through side wall obstruction, but performance is insufficient in soft or mid-hardness snow conditions
Solution Approach 1:
The patent transitions from T-point geometry to a snow compression zone formed by converging grooves with optimized width parameters (at least 2.0mm). This parameter change in groove geometry and dimensions enables better adaptation to soft and mid-hardness snow conditions by allowing sufficient snow flow into the compression zone, which T-points cannot achieve.
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 design significantly increases snow trapping and performance in both braking and traction, with actual testing confirming enhanced grip and handling on snowy surfaces compared to prior art tires.
Implementation Method 1
snow flowing along the first groove reaches the T-point it encounters the side wall of the second groove and is compressed, which completely or partly obstructs the flow of snow
Data Source
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AI summary
A tyre comprises a tread pattern portion (1) having 6 grooves (5-10) which converge and connect with each other to form a snow compression zone (15) defined by a line (16) linking the points on the groove side walls where each groove (5-10) ends. In each groove (5-10), the groove width where the groove (5-10) meets the snow compression zone (15) is at least 2.0 mm. When the groove axis (25, 26) of each groove (5-10) is extended into the snow compression zone (15), each groove axis (25, 26) intersects with each of the other groove axes (25, 26) at the same point within the snow compression zone (15). This can achieve higher snow compression which increases snow trapping and improves snow performance of the tyre.