Heavy Vehicle Tire Tread Venting Structure for Wear and Crack Resistance
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Solution Overview
Problem
Heavy civil engineering vehicle tires face a trade-off between resistance to mechanical attack from stony ground and thermal venting, with existing treads either compromising on wear life or insufficiently effective in temperature management.
Innovation Solution
The tire tread design features a median portion with optimized thicknesses of radially outer and inner portions in longitudinal and transverse cut-outs, ensuring a balance between crack resistance and thermal venting by limiting the volume of cut-outs and maintaining sufficient air circulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the volume of cut-outs is increased to improve thermal venting, then temperature management is enhanced, but the wear life of the tread is reduced
Solution Approach 1:
The cut-outs are segmented into multiple stages with varying thicknesses. The first stage has a smaller thickness to maintain structural integrity and wear resistance, while the second stage has a larger thickness to provide effective thermal venting. This segmentation allows the tread to achieve both long wear life and good thermal management by distributing the venting function across different depth zones.
Solution Approach 2:
Different regions of the cut-outs have different thickness characteristics. The radially outer portion (first stage) has a smaller thickness optimized for mechanical strength, while the radially inner portion (second stage) has a larger thickness optimized for thermal venting. This local differentiation of properties allows simultaneous optimization of wear resistance and thermal management.
2Strength
If the thickness of cut-out walls is increased to improve crack resistance, then mechanical strength is enhanced, but thermal venting effectiveness is reduced
Solution Approach 1:
The wall thickness is segmented into two stages: a first stage with smaller thickness near the running surface that provides adequate crack resistance, and a second stage with larger thickness deeper in the tread that enhances thermal venting. This segmentation resolves the contradiction by assigning different thickness functions to different depth zones.
Solution Approach 2:
The solution moves from a uniform two-dimensional thickness parameter to a three-dimensional variable thickness profile. By introducing radial depth as an additional dimension, the cut-out thickness can vary continuously or in stages from the running surface downward, allowing optimization of both strength (near surface) and thermal venting (deeper zones) simultaneously.
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
This design significantly improves resistance to mechanical attack and thermal management, preventing cracking and maintaining effective venting, thereby extending the tread's service life and ensuring safer operation.
Implementation Method 1
ensuring a balance between crack resistance and thermal venting by limiting the volume of cut-outs and maintaining sufficient air circulation
Data Source
AI summary
A tire tread 1 for a heavy civil-engineering vehicle to provide trade-off between resistance to mechanical attacks and thermal venting. The tread has a medial portion 11 with at least one longitudinal row of blocks 3, each being delimited transversely by two longitudinal channels 41 having a radially outer portion 411 and a radially inner portion 412, and longitudinally by two inter-block transverse cut-outs 42, having a radially outer portion 421 and a radially inner portion 422. The maximum thickness (E11max, E21max) of each outer portion (411, 421) is, at most, equal to 20% of the depth (P1, P2) of the cut-out (41, 42) and strictly less than the maximum thickness (E12max, E22max) of the inner portion (412, 422), and the minimum thickness (E11min, E21min) of each outer portion (411, 421) is at least equal to 5% of the depth (P1, P2) of the cut-out (41, 42).