Slanted Transverse Groove Tread Pattern for Winter Tire
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Solution Overview
Problem
Winter tires face challenges in balancing traction and braking performance on snow and ice with wet and dry roads while maintaining low noise and regular wear, as existing tread patterns compromise stiffness and noise levels when transitioning between conditions.
Innovation Solution
A tread pattern featuring slanted transverse grooves that intersect at intermediate points, maintaining geometric homogeneity and creating alternating rubber blocks for improved traction and braking on all road conditions, with a directional design that keeps the tread center stiff and reduces noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If large and deep grooves are used in the tread pattern, then traction and braking on snow is improved, but tread stiffness is reduced and noise increases on wet or dry roads
Solution Approach 1:
The tread pattern is segmented into multiple groove types (longitudinal grooves, transverse grooves, and diagonal grooves) with different orientations and functions. This segmentation allows each groove type to serve specific purposes: longitudinal grooves for water drainage, transverse grooves for snow traction, and diagonal grooves for enhanced grip, thereby resolving the contradiction between snow performance and tread stiffness.
Solution Approach 2:
Different regions of the tread are assigned different groove densities and patterns. The shoulder portions have specific groove configurations optimized for snow traction, while the central portions maintain higher rubber density for stiffness and stability on wet or dry roads. This local differentiation allows the tread to exhibit context-dependent properties.
2Reliability
If high void-to-rubber ratio is used to improve snow traction, then grip in deep snow is enhanced, but tread wear rate increases and dry road performance deteriorates
Solution Approach 1:
The tread pattern implements local quality by concentrating higher void content in specific regions (shoulder portions with transverse and diagonal grooves) where snow traction is most needed, while maintaining lower void content in the central regions for durability and dry road performance. This spatial variation in void-to-rubber ratio allows the tread to optimize snow grip without sacrificing overall service life.
Solution Approach 2:
The tread is divided into functional zones with different groove densities. Snow-specific grooves (transverse and diagonal) are segmented and placed strategically in shoulder areas, while the central tread maintains a more compact structure. This segmentation enables the tread to achieve high snow performance in critical regions while preserving durability in high-wear areas.
3Reliability
If broad transverse grooves are used to improve snow traction, then grip on snow is enhanced, but noise and block mobility increase on dry roads
Solution Approach 1:
Transverse grooves are localized to the shoulder portions of the tread where they provide snow traction benefits without significantly impacting overall tread stiffness or generating excessive noise. The central portion of the tread maintains a more continuous rubber structure for stable dry road performance and lower noise generation. This spatial localization of transverse grooves resolves the contradiction between snow grip and dry road comfort.
Data Source
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AI summary
Tyre for vehicle wheels comprising a tread pattern (10) defined by modules (M) arranged circumferentially along the tread, each of said modules (M) comprising: a) a first slanted transverse groove (11) extending from a first shoulder portion in the first half of the tread to a first end (15) located in the second half of the tread; b) a second slanted transverse groove (12) extending from a second shoulder portion in the second half of the tread to a second end (16) located in the first half of the tread; c) a third slanted transverse groove (13) extending from the first shoulder portion to a third end (17) located in the first half of said tread; d) a fourth slanted transverse groove (14) extending from the second shoulder portion to a fourth end (18) located in the second half of said tread; wherein: e) the first end (15) is substantially located at an intermediate portion of the second slanted transverse groove (12); and f) the second end (16) is substantially located at an intermediate portion of the first slanted transverse groove (11) of a circumferentially adjacent module.