Motorcycle Tire Groove Pattern for Drainage and Stiffness
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Tyres for front wheels of high-performance motor vehicles face challenges in balancing effective water drainage with structural stiffness, as numerous grooves for drainage weaken the tread band and reduce cornering stiffness.
Innovation Solution
The tyre design features a tread band with a limited number of grooves at the annular central portion, where grooves are spaced closer in the circumferential direction to prevent crossing the equatorial plane, maintaining effective water drainage while enhancing structural strength by reducing the empty/solid ratio and cornering stiffness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large number of grooves are provided in the annular central portion of the tread band to improve water drainage, then water drainage performance is improved, but the structural strength and cornering stiffness of the tread band are reduced
Solution Approach 1:
The groove pattern is segmented into different zones: the first groove crosses the equatorial plane to provide effective water drainage, while the second groove is positioned closer to the first groove (within 3.5% circumferential distance) and does not cross the equatorial plane, avoiding unnecessary structural weakening. This segmentation allows different portions of the tread band to serve different functions optimally.
Solution Approach 2:
Different groove configurations are applied to different local regions of the tread band. The first groove crosses the equatorial plane in regions where water drainage is critical, while the second groove is restricted from crossing the equatorial plane in regions where structural strength is prioritized. This local differentiation optimizes both drainage and strength characteristics.
2Reliability
If grooves extend across the equatorial plane to enhance water drainage, then water discharge capability is improved, but the empty/solid ratio increases reducing structural integrity
Solution Approach 1:
The groove system is divided into two distinct types: the first groove that crosses the equatorial plane for water drainage, and the second groove that approaches but does not cross the equatorial plane. The second groove is positioned within 3.5% circumferential distance from the first groove, creating a functional segmentation that maintains structural integrity while preserving drainage capability.
Solution Approach 2:
The second groove extends partially toward the equatorial plane but deliberately stops before crossing it. This partial action provides sufficient water drainage function without the excessive action of crossing the equatorial plane, which would unnecessarily increase the empty/solid ratio and compromise structural integrity.
Data Source
AI summary
A tire for motorcycles, has a tread band and includes an annular central portion and two annular shoulder portions. The tread band includes at least one first groove extending from one annular shoulder portion to the other annular shoulder portion and having a first vertex at the annular central portion, and at least one pair of second grooves arranged on opposite sides with respect to the equatorial plane, each groove of said at least one pair of second grooves being inclined with respect to the equatorial plane and extending from a respective annular shoulder portion up the annular central portion without intersecting the equatorial plane. The distance in the circumferential direction between an axially inner end of each groove of said at least one pair of second grooves and the first vertex is no greater than 3.5% of the circumferential extension of the tread band.