Heavy Vehicle Tire Tread Edge Corner Ratios
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Solution Overview
Problem
Heavy-duty vehicle tires for civil engineering applications face challenges in achieving optimal longitudinal and transverse grip on uneven and wet surfaces while maintaining satisfactory wear resistance and thermal endurance.
Innovation Solution
The tire tread design incorporates specific ratios of longitudinal and transverse edge corners, overall volume voids ratios, and circumferential groove configurations to enhance grip on wet and muddy surfaces, with a focus on the distribution and depth of cuts and grooves to ensure effective edge corner lengths and volume voids ratios, promoting mud removal and wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the tread comprises a high number of cuts and edge corners to improve grip on wet and muddy surfaces, then longitudinal and transverse grip are improved, but wearing performance deteriorates due to increased material removal
Solution Approach 1:
The tread design implements different volume voids ratios for different zones: the lateral portions have a higher volume voids ratio (15-30%) to enhance grip and mud ejection, while the central portion maintains a lower volume voids ratio (5-15%) to preserve wear resistance. This spatial differentiation of structural properties resolves the contradiction between grip improvement and wear protection.
2Reliability
If the circumferential grooves are deep and wide to improve mud removal and grip, then traction and braking are enhanced, but the volume of wearable material decreases
Solution Approach 1:
The circumferential grooves are positioned specifically in the lateral portions of the tread where mud accumulation is most problematic. By concentrating groove features in lateral zones rather than distributing them uniformly across the entire tread width, the design achieves effective mud removal and grip enhancement while preserving wearable material in the central load-bearing region.
Solution Approach 2:
The tread is segmented into functional zones (lateral portions with grooves for mud ejection, central portion with more material for wear resistance and load bearing). This segmentation allows each zone to optimize its properties for its specific function, resolving the contradiction between mud removal capability and material preservation.
3Reliability
If the tread has high edge corners ratios to improve grip on uneven ground, then longitudinal and transverse grip are enhanced, but thermal endurance deteriorates due to increased heat generation from friction
Solution Approach 1:
The high edge corners ratios are concentrated in the lateral portions where grip enhancement is most needed for steering and stability on uneven ground. The central portion maintains a more moderate structure that generates less friction heat during rolling, thus locally optimizing the balance between grip and thermal management.
Data Source
AI summary
Tire (1) for a heavy-duty vehicle of civil engineering type, and more particularly to the tread (2) thereof, and seeks to improve the grip thereof, while at the same time ensuring a satisfactory compromise with wearing and thermal endurance. The tread (2) comprises cuts (3, 4, 5) distributed, in a circumferential direction (XX′) of the tire, among circumferential grooves (3) and, in an axial direction (YY′) of the tire, transverse sipes (4) and transverse grooves (5), the cuts (3, 4, 5) delimiting elements in relief (6), each cut (3, 4, 5) being delimited by two faces facing one another and each face intersecting the tread surface (21) along an edge corner (311, 321; 411, 421; 511, 521). The tread (2) having a longitudinal edge corners ratio TAX equal to the ratio LX/S between the sum LX of the projections, on to the circumferential direction (XX′), of the effective edge corner lengths, contained in an elementary tread surface portion of surface area S, and the surface area S, and a transverse edge corners ratio TAY equal to the ratio LY/S between the sum LY of the projections, onto the axial direction (YY′), of the effective edge corner lengths, contained in an elementary tread surface portion of surface area S, and the surface area S, the longitudinal edge corners ratio TAX is at least equal to 4 m−1 and the transverse edge corners ratio TAY is at least equal to 6 m−1.