Tire Tread Groove Width Variation for Snow Traction
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Solution Overview
Problem
Existing tire designs with outboard lateral grooves do not adequately enhance on-snow performance, as they fail to effectively manage snow traction and steering stability on both snowy and dry roads.
Innovation Solution
A tire with an asymmetrical tread pattern featuring outboard and inboard shoulder main grooves, outboard and inboard crown main grooves, and outboard lateral grooves that are inclined and have varying widths, which form continuous snow blocks for improved traction and prevent snow clogging, while maintaining steering stability on dry roads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If outboard lateral grooves are added to improve on-snow performance, then snow traction is enhanced, but the tread pattern rigidity decreases
Solution Approach 1:
The groove width varies along the axial direction, being wider at the axially outer end and narrower at the axially inner end. This local variation in groove dimensions allows the outer portion to effectively evacuate snow and improve traction, while the inner portion maintains sufficient land width to preserve tread rigidity and steering stability.
Solution Approach 2:
The groove width parameter is changed continuously along the axial direction, transitioning from a wider width at the outer end to a narrower width at the inner end. This parameter gradient enables the groove to perform multiple functions: snow evacuation where width is beneficial, and rigidity maintenance where narrower dimensions are advantageous.
2Reliability
If continuous snow blocks are formed to improve traction, then on-snow performance increases, but snow clogging occurs
Solution Approach 1:
The continuous snow block is segmented into multiple discrete snow blocks by the inclined groove portions. Each groove segment creates individual snow blocks rather than one continuous mass, allowing snow to be progressively evacuated and preventing clogging while still providing effective traction through the distributed block structure.
Solution Approach 2:
The inclined groove portions create dynamic snow block formation and evacuation as the tire rotates. The inclination angle causes snow blocks to be pushed forward and ejected rather than accumulating, creating a dynamic clearing action that prevents clogging while maintaining traction during the rolling motion.
3Reliability
If groove width is increased to enhance snow evacuation, then on-snow traction improves, but steering stability on dry roads deteriorates
Solution Approach 1:
The groove width is locally optimized for different functions: wider at the axially outer end for effective snow evacuation and traction, and narrower at the axially inner end to maintain sufficient land width for steering stability on dry roads. This local differentiation resolves the contradiction between snow performance and dry road handling.
Solution Approach 2:
The groove provides partial snow evacuation capability through its varied width design, achieving sufficient snow management without the excessive width that would compromise steering stability. The gradual width reduction allows adequate snow clearance while preserving the structural integrity needed for stable steering.
Data Source
AI summary
A tire comprises a tread portion having an outboard tread edge To and an inboard tread edge Ti. The tread portion is provided with: an outboard shoulder main groove extending continuously in the tire circumferential direction; an outboard crown main groove extending continuously in the tire circumferential direction and disposed between the outboard shoulder main groove and a tire equator; and outboard lateral grooves extending from the outboard crown main groove to the outboard tread edge To. The groove width of each of the outboard lateral grooves is decreased toward the outboard crown main groove 4.