Pneumatic Tire Tread Wear Monitoring via Variable Sipe Depth
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Solution Overview
Problem
Current solutions for monitoring tire tread wear only provide a qualitative indication of when replacement is necessary, lacking a continuous, quantitative assessment of wear levels, which hinders effective maintenance and performance on wet and snow-covered surfaces.
Innovation Solution
A tread design featuring sipes with varying depths and conformations along the direction of wear, allowing for continuous wear monitoring without compromising performance, with sections that change shape as wear increases, enhancing traction and snow entrapment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wear indicator elements are incorporated into the tread at a certain depth to indicate when replacement is needed, then the user is alerted of wear limits, but only a qualitative indication is provided rather than continuous quantitative monitoring
Solution Approach 1:
The tread is segmented into multiple tread components (tread blocks) arranged in a pattern, with each component containing sipes at different depths. This segmentation allows different portions of the tread to wear at different rates, providing continuous visual information about wear progression rather than a single binary indicator.
Solution Approach 2:
Different regions of the tread are given different local qualities through varying sipe depths and configurations in different tread components. The sipes in various tread blocks have different initial depths, creating zones that wear at different rates and become exposed at different times, providing continuous quantitative wear information.
2Reliability
If sipes are designed to improve performance on wet and snow-covered surfaces, then traction is enhanced, but the tread structure becomes more complex
Solution Approach 1:
The tread pattern is divided into multiple tread components arranged in repeating units, with each component containing sipes. This segmentation allows the complex siped structure to be systematically organized and manufactured while maintaining performance benefits across the entire tread surface.
Solution Approach 2:
The sipes are designed to dynamically open and close based on tread wear and operating conditions. As the tread wears, sipes at different depths become exposed sequentially, allowing the tread to adapt its characteristics over time. The sipes can also flex and open under load to enhance traction on wet and snowy surfaces.
3Reliability
If the tread components are made more pliable to improve performance on wet surfaces, then the wiping effect is enhanced, but the rigidity of the structural component is compromised
Solution Approach 1:
Different portions of the tread components have different local qualities - the siped regions are designed to be more pliable to enhance wiping effect and flex under load, while the overall tread component maintains sufficient rigidity through its structural design and material properties. This local differentiation allows simultaneous optimization of both flexibility for wet surface performance and rigidity for structural integrity.
Solution Approach 2:
The tread components exhibit dynamic mechanical properties that adapt to loading conditions. Under normal conditions, the components maintain rigidity for structural support, but under operational loads, the siped regions can flex and open to provide the wiping effect needed for wet surface traction, effectively transitioning between rigid and pliable states as needed.
Data Source
AI summary
Tread for a pneumatic tyre comprising a sipe having a sipe extension (L) and a sipe depth (P) along a direction of wear (U), wherein said sipe has at least two sections (S1, S2) along said direction of wear (U) having respective differentiated conformations, such that an intersection profile (P1, P2) between the sipe and a surface (T1, T2) parallel to the contact surface of the tread is different for each of said at least two sections (S1, S2), wherein at least one surface section (S1) of said at least two sections (S1, S2) has a depth (PS) that is variable along said sipe extension (L), said two sections (S1, S2) being connected by a transition section (S3) defining a transition line (TL) between the respective sections (S1, S2), said variable depth (PS) of said surface section, presenting a maximum depth (PSMAX) and a minimum depth (PSMIN), and wherein the surface section (SI) has a twisted configuration.