Winter Tire Tread Groove Projections for Snow Release and Grip
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Solution Overview
Problem
Existing tire treads struggle to achieve a high level of both snow-on-snow friction and milling behavior, particularly when compacted snow blocks the leading edges of tread blocks, impairing traction in snowy conditions.
Innovation Solution
A projection is positioned with its radially outer end at a specific distance from the tread base surface, separating the upper snow layer from the lower snow reservoir in the groove, allowing the upper layer to fall out and expose block edges for milling while maintaining a snow reservoir for friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If snow accumulation in tread grooves is promoted to enable snow-on-snow friction, then snow retention is improved, but milling behavior is reduced because snow blocks the leading edges of tread blocks
Solution Approach 1:
The tread groove is segmented into multiple depth zones by projections at different radial positions. The groove has a first section with a first projection and a second section with a second projection, creating distinct functional zones: an upper zone for snow release and a lower zone for snow retention, enabling both milling behavior and snow-on-snow friction to occur simultaneously in different spatial regions
Solution Approach 2:
Different sections of the tread groove are given different local properties through the projections. The first projection (at 5-30% depth) creates a local feature for snow release at the leading edge, while the second projection (at 40-70% depth) creates a local snow reservoir. This local differentiation allows the groove to perform multiple functions: releasing snow to expose tread block edges for milling, while simultaneously retaining snow for friction
2Reliability
If the tread groove is completely filled with snow to maximize snow-on-snow friction, then traction is improved, but the leading edge of adjacent tread blocks is blocked and cannot mill into the snow cover
Solution Approach 1:
The projections are positioned and sized to perform preliminary snow management actions before the tread block fully engages the snow cover. The first projection at 5-30% depth preemptively releases a layer of snow from the upper groove section, ensuring that when the tread block edge enters the ground contact patch, it is already exposed and ready to mill into the snow cover without being blocked by accumulated snow
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
This design enhances milling performance by exposing block edges for traction while preserving snow-on-snow friction, achieving a balanced compromise between the two mechanisms.
Implementation Method 1
The upper layer of snow can then fall out of the tread groove, exposing the tread block edges adjacent to the tread groove to mill into a wintry surface
Data Source
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AI summary
A tread for a vehicle tire, wherein the tread has at least one transverse or oblique groove with a first groove flank and a second groove flank, wherein at least on this first groove flank a projection is formed. The projection is arranged with its radially outer end at a distance of between 5% and 30% of the depth of the transverse or oblique groove from a radially outer base surface of the tread.