Motorcycle Tire Tread Pattern for Off-Road and Road Stability
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Solution Overview
Problem
Motorcycle tires designed for both on-road and off-road use face challenges in achieving optimal traction and stability across varying terrains without compromising performance in terms of kilometers traveled, noise, and vibrations, as well as controllability and steerability on slippery surfaces.
Innovation Solution
A tread pattern featuring blocks that extend circumferentially in the central zone for traction and water drainage, with transverse grooves providing lateral stability and grip, particularly when accelerating out of bends and braking, while a continuous transverse portion ensures stability during roadway travel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the tread pattern is designed with blocks extending circumferentially in the central zone for optimal off-road traction, then traction on cross-country terrain is improved, but road-holding and stability during roadway travel deteriorate
Solution Approach 1:
The tread pattern is divided into distinct zones with different block configurations: the central zone (30%) has circumferentially extending blocks for off-road traction, while the outer zones (70%) have transverse blocks for road-holding. This local differentiation allows each zone to optimize its function without compromising the other.
Solution Approach 2:
The tread band is segmented into multiple functional zones along the circumferential direction, with the central zone dedicated to off-road performance and outer zones dedicated to on-road performance. This segmentation resolves the contradiction by assigning different tread characteristics to different spatial locations.
2Reliability
If the tread pattern prioritizes grip and traction on slippery terrain, then controllability on muddy surfaces is improved, but braking performance and lateral stability on dry roads deteriorate
Solution Approach 1:
The outer zones of the tread band (70% of width) are equipped with transverse blocks specifically designed for dry road braking and cornering, while the central zone maintains circumferential blocks for slippery terrain traction. This spatial differentiation of block orientations allows simultaneous optimization of both functions.
3Reliability
If the tread pattern is optimized for maximum grip on varied terrain, then acceleration out of bends is improved, but tire wear and vibrations increase
Solution Approach 1:
The central zone (30% of tread width) contains circumferential blocks that provide acceleration grip while being positioned away from the outer edges where vibrations are most problematic. The outer zones with transverse blocks handle steering and lateral forces, separating the acceleration function from the vibration-prone regions.
Data Source
AI summary
A motorcycle tire includes: a tread band with a tread pattern including, in a zone symmetrically arranged on either side of the equatorial plane, a first module repeatedly duplicated in a direction of circumferential extension of the tire. The module has at least two first longitudinal grooves inclined in an oppositely arranged manner relative to the equatorial plane; and at least two substantially transverse grooves designed to intersect the two longitudinal grooves so as to define at least one block. The zone has a width in the axial direction of between 20% and 65% of the width of the tread band and a solids/voids ratio equal to at least 0.20. The tread pattern also has at least one substantially transverse continuous portion which extends over the entire width of the tread band delimiting at least one end of the module in the circumferential direction.