Heavy Duty Tire Tread Lug Segmentation for Heat Dissipation
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Solution Overview
Problem
Very large off-road tires face premature failure due to excessive heat buildup, high strain, and bead failure under extreme dynamic and static loads, especially in oil sands environments, where high-speed operation and thick viscous sand conditions lead to tire bouncing and deflection.
Innovation Solution
A heavy-duty tire design featuring a carcass with a multi-radius tread, specific lug and groove patterns, wider belts, reduced bead apex height, and a more rounded footprint to enhance stability, reduce heat buildup, and distribute load evenly, including a center groove with a tie bar for added stiffness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the tire operates at high speed under extreme loading conditions, then productivity is improved, but excessive heat buildup occurs causing premature tire failure
Solution Approach 1:
The tread is segmented into multiple rows of lugs (first row, second row, center row) separated by grooves (shoulder grooves, center groove). This segmentation allows each lug row to independently deform and dissipate energy, reducing heat buildup while maintaining traction at high speeds
Solution Approach 2:
The tire design incorporates a multi-radius tread profile with different radii in the shoulder region versus the center region. This dimensional variation in the tread profile allows the shoulder lugs to better conform to uneven terrain while the center maintains stability, distributing heat generation across different operational zones
2Ease of manufacture
If the tire uses a conventional tread design, then manufacturing is simpler, but traction and load distribution are insufficient under extreme conditions
Solution Approach 1:
Different regions of the tread have different lug configurations optimized for their specific functions: shoulder lugs are positioned to maximize lateral traction and stability, while center lugs are arranged for longitudinal traction. Each region's lug pattern is locally optimized rather than using a uniform design across the entire tread
Solution Approach 2:
The tread design features asymmetric lug arrangements where the first and second rows of lugs extend at different angles relative to the centerline, with shoulder grooves positioned to create asymmetric stress distribution that enhances traction in dominant driving directions while maintaining manufacturing feasibility
3Ease of manufacture
If the tire has a standard footprint shape, then manufacturing is easier, but stability and heat distribution are insufficient under dynamic loading
Solution Approach 1:
The tire employs a multi-radius tread profile with curved transitions between different radius zones. The shoulder region has a different radius of curvature than the center region, creating a rounded, contoured footprint that distributes contact pressure more evenly across the terrain, enhancing stability while maintaining manufacturability through standard molding techniques
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
A heavy-duty tire (10) is disclosed comprising a carcass and a tread (12) located radially outward of the carcass. The tread (12) has a plurality of lugs (30, 40, 50, 60, 70), the lugs (30, 40, 50, 60, 70) extending radially outward from an inner tread area and being located between a first and a second lateral tread edge (13, 14). The lugs form a first row of lugs (30) extending from the first tread lateral edge (13) axially inwards toward the center plane, and a second row of lugs (40) extending from the opposite second lateral tread edge (14) and axially inwards toward the center plane. The lugs (30, 40) of the first and the second row are separated by a plurality of shoulder grooves (22, 24). The lugs (30) of first row of lugs are aligned with the lugs (40) of the second row of lugs. A center row of lugs (50) is located between a first and second offset row of lugs (60, 70). All of the lugs (30, 40, 50, 60, 70) in each row are aligned circumferentially.