Scooter Tire Tread Pattern for Wet Grip and Low Rolling Resistance
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Solution Overview
Problem
The challenge is to design motorcycle tires, particularly for scooters and maxi scooters, that balance low rolling resistance with effective wet ground performance, grip, and stability, as conventional low rolling resistance tires compromise on drainage and grip due to limited groove arrangements.
Innovation Solution
A tire tread pattern featuring a combination of substantially longitudinal and transversal grooves, with a void-to-rubber ratio of 12% or less, where the grooves are arranged to optimize even contact pressure and water drainage, ensuring improved handling and wet ground performance without excessive rolling resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large number of grooves are arranged on the tread to improve water drainage and grip on wet ground, then drainage performance and wet grip are improved, but rolling resistance increases due to extensive deformation of the tread
Solution Approach 1:
The tread pattern is segmented into distinct functional zones: longitudinal grooves (extending circumferentially) for water evacuation and grip, transversal grooves (extending radially) for additional drainage channels, and intermediate grooves for supplementary water removal. This segmentation allows each groove type to perform its specific function efficiently while maintaining overall low rolling resistance through optimized groove distribution and dimensions
Solution Approach 2:
Different regions of the tread band are assigned different groove configurations tailored to local requirements. The longitudinal grooves are positioned to handle primary water evacuation, transversal grooves are placed to assist drainage in specific zones, and intermediate grooves are distributed to provide additional drainage capacity where needed. This local optimization ensures effective water removal without excessive groove coverage that would increase rolling resistance
2Loss of energy
If a limited number of grooves are arranged on the tread to reduce rolling resistance, then rolling resistance is reduced, but drainage performance and grip on wet ground deteriorate
Solution Approach 1:
The tread pattern incorporates grooves of varying lengths and configurations that dynamically adapt to different operating conditions. Longitudinal grooves provide continuous water evacuation paths during straight-line travel, while transversal and intermediate grooves activate during cornering or high-speed wet conditions to enhance drainage. This dynamic response allows the tread to maintain low rolling resistance during normal operation while providing excellent drainage performance when needed
Solution Approach 2:
The invention adds a third dimension to traditional tread patterns by incorporating grooves that extend in multiple directions (circumferential, radial, and intermediate angles) rather than just circumferentially. This multi-dimensional groove arrangement creates a three-dimensional water evacuation network that efficiently removes water from the contact patch without requiring excessive groove volume, thus maintaining low rolling resistance while improving wet ground performance
Data Source
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AI summary
Tyre for motorcycles comprising a tread band on which a tread pattern (10) is formed, the tread pattern (10) comprising a plurality of grooves arranged so as to define on said tread band a void to rubber ratio lower than or equal to about 12%, wherein said tread pattern (10) comprises a pair of first longitudinal grooves (11, 12) arranged on opposite sides of the equatorial plane (X-X), one pair of second substantially longitudinal grooves (13, 14) arranged in an axially outer position with respect to said pair of first substantially longitudinal grooves (11, 12);, and a plurality of first transversal grooves (20, 21) arranged on at least 50% of the lateral extension of portions (15, 16) comprised between said the first and the second substantially longitudinal grooves (11, 12, 13, 14).