Heavy Duty Tire Tread With Segmented Cavity Design
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Solution Overview
Problem
Heavy-duty tire treads face challenges in maintaining performance and mechanical strength due to foreign body penetration through cavities formed at the intersection of incisions, which can lead to wear and potential damage to the tire's crown reinforcement.
Innovation Solution
The tire tread design features a plurality of cutouts opening onto the surface, with each cutout extending radially into a channel and intersecting incisions forming a well with varying sections, where the reduced section area limits foreign body introduction and the maximum section area facilitates manufacturing and protection, ensuring foreign bodies are blocked during contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If incisions intersect to form cavities at well locations, then manufacturing and demolding are facilitated, but foreign bodies can penetrate through these cavities and attack the tire structure
Solution Approach 1:
The cavity is segmented into two distinct zones: a first zone with a larger cross-sectional area that facilitates manufacturing and demolding, and a second zone with a reduced cross-sectional area that acts as a barrier to foreign body penetration. This segmentation allows the cavity to simultaneously serve manufacturing needs while preventing harmful foreign body intrusion into the tire structure.
Solution Approach 2:
Different zones of the cavity are assigned different geometric properties: the first zone has larger dimensions optimized for mold insertion and extraction, while the second zone has reduced dimensions specifically designed to block foreign bodies. This local differentiation of geometric quality enables the cavity to fulfill dual functions of ease of manufacture and foreign body protection.
2Use of energy by moving object
If groove depths are reduced when new, then energy dissipation is reduced and consumption is improved, but tire performance may be compromised
Solution Approach 1:
The tread geometry is designed to evolve dynamically with wear. When new, the tread has reduced groove depths that minimize energy dissipation and improve fuel consumption. As the tire wears, the geometry naturally transforms to deeper grooves that enhance water evacuation and maintain traction performance. This dynamic adaptation allows the tire to optimize for energy efficiency during early life and for performance during later stages.
Solution Approach 2:
The tread is pre-configured with specific geometric characteristics when new that are optimized for energy efficiency. The reduced groove depths and specific block configurations are established beforehand to minimize energy dissipation during the initial service period, before wear transforms the geometry toward performance optimization.
3Reliability
If the tread geometry evolves with wear, then tire performance is maintained throughout use, but the complexity of the tread design increases
Solution Approach 1:
Multiple functional requirements are merged into a single integrated tread geometry design. The same geometric features that provide initial energy efficiency also contain embedded elements (such as the multi-zone cavity structure) that will transform with wear to provide performance maintenance. This merging eliminates the need for separate systems and allows natural wear to drive the performance evolution.
Solution Approach 2:
The tread geometry utilizes parameter changes through wear to achieve performance maintenance. Specific geometric parameters (groove depths, block dimensions, cavity sizes) are initially set to values optimized for energy efficiency, and wear naturally transforms these parameters toward values optimized for traction and water evacuation. The design leverages wear-induced parameter evolution rather than requiring active control mechanisms.
Data Source
AI summary
Tread (1) for heavy vehicle tyre, this tread having a tread surface (10) in the new state, this tread comprising a plurality of cuts opening onto the tread surface in the new state and at least one canal (30) internal to the tread, this canal (30) being intended to form a new groove when the tread becomes partially worn; furthermore, each canal (30) is extended radially toward the tread surface (10) by a sipe (4) having the same orientation as said canal and of width L4, and in addition a plurality of sipes (3) of width L3 intersect the sipe that extends each canal to form a well (50), this well opening both onto the tread surface (10) in the new state and into a canal (30), the tread according to the invention being such that, at least for a plurality of wells (50), each well has, in a direction extending from the tread surface (10) toward the canal (30), at least one part of maximum cross section (51) and one part of smaller cross section (52), the part of smaller cross section (52) having a cross-sectional area smaller than the cross-sectional area of the part of maximum cross section (51) so as to limit the ingress of foreign bodies of determined dimensions into this well and as far as a canal.