RFID-Embedded Tire Covering Layer for Stress and Peeling Control
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Solution Overview
Problem
Existing pneumatic tires with embedded RFID tags face durability issues due to inadequate covering layer properties, leading to stress concentration, peeling, and impaired protective effects on the transponder, especially in varying temperature conditions.
Innovation Solution
The pneumatic tire is designed with a covering layer that sets specific modulus and storage modulus ranges for different temperatures, along with optimal placement and composition to ensure transponder durability and tire durability, using a rubber or elastomer with a relative dielectric constant of 7 or less and a thickness of 0.5 mm to 3.0 mm, and embedding the transponder on the outer side of the carcass layer to improve communication performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the elastic modulus of the covering layer is increased to improve protective effect on the transponder, then transponder protection is improved, but stress concentration is generated at or near the edge of the covering layer, causing damage to the tire
Solution Approach 1:
The patent applies parameter changes by precisely controlling the elastic modulus of the covering layer within the range of 0.5 MPa to 5.0 MPa. This parameter optimization allows the covering layer to provide sufficient protective effect on the transponder while avoiding excessive stiffness that would cause stress concentration at the edges, thereby resolving the technical contradiction between protection and stress prevention.
2Stability of the object's composition
If the temperature dependency of the modulus of the covering layer in a low temperature range is decreased to maintain stability, then stability is improved, but stress concentration is generated at or near the edge of the covering layer with a rise in tire temperature, causing peeling and tire damage
Solution Approach 1:
The patent applies parameter changes by optimizing the temperature dependency of the modulus of the covering layer. Specifically, the ratio of the modulus at -20°C to the modulus at 0°C is controlled to be within a specific range, and the modulus at 0°C is maintained within 0.5 MPa to 2.0 MPa. This parameter optimization ensures that the covering layer maintains sufficient stability in low-temperature environments while allowing appropriate flexibility changes with temperature rise, preventing stress concentration and peeling.
3Stability of the object's composition
If the temperature dependency of the modulus of the covering layer in a normal to high temperature range is decreased to maintain stability, then stability is improved, but stress concentration is generated at or near the edge of the covering layer at high temperature, causing peeling and tire damage
Solution Approach 1:
The patent applies parameter changes by controlling the temperature dependency of the modulus in the normal to high temperature range. The ratio of the modulus at 20°C to the modulus at 100°C is maintained within a specific range, and the modulus at 20°C is controlled to be within 0.4 MPa to 1.5 MPa. This parameter optimization ensures that the covering layer maintains sufficient stability at normal temperatures while allowing appropriate flexibility at high temperatures, preventing stress concentration and peeling.
4Object-affected harmful factors
If the elastic modulus of the covering layer is decreased to reduce stress concentration, then stress concentration is reduced, but the protective effect on the transponder is impaired
Solution Approach 1:
The patent applies parameter changes by precisely controlling the elastic modulus of the covering layer within the range of 0.5 MPa to 5.0 MPa. This parameter optimization ensures that the covering layer maintains sufficient protective effect on the transponder while avoiding excessive stiffness that would cause stress concentration, thereby resolving the technical contradiction between protection and stress prevention.
5Strength
If the covering layer thickness is increased to improve transponder protection, then protective effect is improved, but manufacturing complexity and material usage increase
Solution Approach 1:
The patent applies parameter changes by optimizing the elastic modulus of the covering layer within the range of 0.5 MPa to 5.0 MPa. This parameter optimization allows the covering layer to achieve sufficient protective effect on the transponder with an appropriate thickness, avoiding excessive material usage and manufacturing complexity while maintaining adequate protection.
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 solution effectively improves transponder durability by preventing stress concentration and peeling, ensuring tire durability, and enhancing communication performance by optimizing the covering layer's properties and placement.
Implementation Method 1
the secant modulus of elasticity at 10% deformation at 20° C. of the covering layer is in a range of from 0.5 MPa to 5.0 MPa
Data Source
AI summary
A pneumatic tire includes: a tread portion extending in a tire circumferential direction and having an annular shape; a pair of sidewall portions disposed on both sides of the tread portion; and a pair of bead portions disposed on an inner side in a tire radial direction of the sidewall portions. The tire is embedded with a transponder covered with a covering layer. A modulus M50 (0° C.) at 50% deformation at 0° C. of the covering layer is in a range of from 0.5 MPa to 2.0 MPa, and a modulus M50 (−20° C.) at 50% deformation at −20° C. of the covering layer and the modulus M50 (0° C.) at 50% deformation at 0° C. of the covering layer satisfy a relationship 1.0<M50 (−20° C.)/M50 (0° C.)≤2.5.