Heavy Load Tyre Tread Block Deformations for Wear and Traction
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Solution Overview
Problem
Tyres for heavy load vehicles face challenges in balancing traction, steerability, and wear evenness while minimizing rolling resistance and noise, as deep transverse sipes improve traction but can lead to uneven wear and vibrations.
Innovation Solution
A tread pattern with a central row of blocks separated by deep sipes, featuring first and second deformations that constrain adjacent blocks in the circumferential and radial directions, respectively, to enhance traction and wear evenness without hindering drainage and controllability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If deep transverse sipes are provided to improve traction and water draining features, then traction and drainage performance are improved, but excessive and uneven wear phenomena and disturbing vibrations occur
Solution Approach 1:
The patent applies local quality by providing deformations only on the transverse walls of blocks in specific regions (central row of blocks) rather than uniformly across all blocks. The deformations are localized to areas where mutual constraint is most needed to prevent excessive wear and vibrations while maintaining traction performance.
Solution Approach 2:
The patent employs asymmetry by creating non-symmetric deformations on the transverse walls of blocks. The first and second deformations have different geometries and orientations, with the first deformation having a first geometry and the second deformation having a second geometry, allowing differential constraint in different directions to optimize both traction and wear characteristics.
2Force
If transverse sipes with high depth and proper meshing are provided to improve traction, then traction and pickup performance are improved, but mileage performance deteriorates
Solution Approach 1:
The patent applies parameter changes by modifying the geometric parameters of the block deformations. The deformations are designed with specific dimensions and orientations that allow the blocks to maintain mutual constraint during operation, reducing wear and extending mileage while preserving the deep sipe structure needed for traction.
Data Source
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AI summary
The present invention relates to a method for increasing the performance of a tyre for heavy load vehicle wheels by varying the constraint formed between adjacent blocks. The invention further relates to a tyre (1) having a tread (2) comprising a central annular portion (L1) across an equatorial plane (X-X) and two shoulder annular portions (L2, L3), located on axially opposite sides relative to the central annular portion (L1). The central annular portion is separated from each shoulder annular portion by a respective first circumferential groove (3, 4). The central annular portion (L1) comprises a plurality of blocks (20), arranged in at least one circumferential row comprised between two circumferential grooves (3, 4, 5, 6, 7), and at least one transverse sipe (8) adapted to define two circumferentially consecutive blocks (20). The blocks are provided with at least one first deformation, adapted to define respective portion of mutual constraint in adjacent blocks, and with a secondary deformation grafted on the first deformation in the circumferential direction.