Elongated Lobe Wear Indicator for Heavy-Load Tire Sidewall
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing sidewall wear indicators for heavy-load vehicle tires, particularly those for buses and minibuses, suffer from localized stress concentrations that can lead to cracks due to their design, which compromises the structural integrity and reduces the tire's lifespan.
Innovation Solution
The implementation of an elongated lobe-shaped wear indicator with a reduced width portion in a direction perpendicular to the elongation direction, distributing stress over a wider area and reducing combined bending and twisting stresses, thereby minimizing the risk of crack formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional hole-shaped or circumferential groove wear indicators are used, then sidewall wear can be monitored, but stress concentrations occur leading to cracks and reduced tire lifespan
Solution Approach 1:
The wear indicator is segmented into multiple discrete openings arranged in a radial pattern, allowing stress to be distributed across multiple smaller discontinuities rather than concentrated in a single large indicator, thereby reducing crack propagation risk while maintaining wear monitoring capability
Solution Approach 2:
The openings are strategically positioned in specific angular intervals around the sidewall, creating localized measurement points that provide sufficient wear information without requiring continuous large-area indicators that would cause excessive stress concentrations
2Measurement precision
If wear indicator size is increased to improve visibility and wear detection, then wear monitoring becomes more effective, but stress concentrations increase and compound thickness available to absorb cyclic stresses decreases
Solution Approach 1:
Instead of using one large wear indicator, the design segments the indicator into multiple smaller openings distributed around the sidewall. Each opening is small enough not to create excessive stress concentrations, yet collectively they provide comprehensive wear monitoring coverage
Solution Approach 2:
The wear indicator transitions from a single large two-dimensional area to multiple small openings distributed in a radial/angular pattern, adding the angular dimension to the design. This distribution strategy reduces the stress impact on any single location while maintaining overall monitoring effectiveness
Data Source
Figure 1
Figure 2A~2
Figure 3
AI summary
Tire (1) for heavy-load vehicle wheels comprising a tread band (2) and two sidewalls (3) opposed with respect to the said tread band (2); at least one of said sidewalls (2) comprising a sidewall portion (4) provided with at least one wear indicator (5) obtained in the sidewall, wherein the sidewall wear indicator (5) comprises at least one lobe shape (6) elongated in a first direction (Di) and a reduced width portion (7) in a second direction (D2) substantially perpendicular to said first direction.