Incised Tread Design for Mining Tire Grip and Wear
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Solution Overview
Problem
Tires for heavy vehicles carrying loads over uneven ground face challenges in maintaining grip and wear performance, particularly in aggressive mining environments, where the tread structure is subjected to varying loads and wear patterns.
Innovation Solution
A tread pattern design featuring circumferential cuts and transverse or oblique sipes that close partially during contact, with a specific void volume ratio and depth distribution, combined with blocking means to maintain tread stiffness and friction, and a rubber compound for improved wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wide grooves and narrow sipes are used to ensure satisfactory grip, then traction and braking performance are improved, but tread stiffness is reduced and wear performance deteriorates
Solution Approach 1:
The tread is segmented into multiple regions with different cut patterns: shoulder regions with first circumferential cuts for grip, and a central region with second circumferential cuts and transverse sipes for maintaining stiffness. This segmentation allows different parts of the tread to perform different functions simultaneously.
Solution Approach 2:
Different regions of the tread are given different local qualities through varying cut depths and patterns. The shoulder regions have deeper cuts for enhanced grip, while the central region has shallower cuts and sipes to maintain tread stiffness and wear resistance, creating local optimization for different functional requirements.
2Reliability
If deep cuts are made in the tread to improve grip, then traction performance is enhanced, but the volume of wearable material is reduced
Solution Approach 1:
The tread depth is segmented into different levels: deeper first circumferential cuts in shoulder regions for traction, and shallower second circumferential cuts in the central region. This segmentation allows deep cuts where needed for grip while preserving wearable material in the central region.
Solution Approach 2:
Deep cuts are applied partially only in the shoulder regions where grip is most needed, rather than uniformly across the entire tread. The central region receives shallower cuts, providing just enough grip enhancement while preserving maximum wearable material volume.
3Reliability
If the tire reinforcing structure is flattened to improve tread contact, then grip is improved, but the tread becomes softer and wear resistance decreases
Solution Approach 1:
The tread structure is segmented into shoulder regions that can flatten for contact improvement and a central region that maintains structural integrity. The second circumferential cuts and sipes in the central region are designed to control flattening while preserving wear resistance.
Solution Approach 2:
Different regions exhibit different local qualities in terms of flattening behavior: shoulder regions are designed to flatten for improved contact, while the central region maintains stiffer characteristics through its cut pattern to preserve wear resistance and overall tread strength.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The tread design enhances wear performance and maintains grip across all stages of tread wear, providing a balance between stiffness and reduced heating, while accommodating heavy loads and uneven terrain.
Implementation Method 1
the sipes have widths suited to close up again at least in part when they enter the contact patch in which the tire is in contact with the roadway
Data Source
AI summary
The tread has a total width W and is provided with circumferential cuts that have a mean depth at least equal to 70 mm and at most equal to the thickness of wearable material. The circumferential cuts divide the tread into a middle region with an axial width Wm of 50% to 80% of the total width W. The middle region has transverse or oblique sipes opening into the circumferential cuts and closing at least in part when they enter the contact patch. The sipes have a depth at least equal to 75% of the depth of the circumferential cuts and delimit elements of material of height equal to the mean depth H of the said sipes and of circumferential length B equal to the mean distance between two sipes. For all the elements of material, the ratio H/B is greater than 0.5 and at most equal to 2.5.