Pneumatic Tire Transponder Covering Layer Tg Optimization
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Solution Overview
Problem
Pneumatic tires with embedded RFID transponders face durability issues due to inadequate physical properties of the covering layer, particularly at low temperatures, leading to transponder damage and tire degradation.
Innovation Solution
A pneumatic tire design with a covering layer having a glass transition temperature between −70° C. and −45° C., a storage modulus of 3 MPa to 17 MPa at −20° C., and a relative dielectric constant of 7 or less, made from rubber or elastomer with 20 phr or more of white filler, ensuring transponder durability and communication performance while maintaining tire durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the glass transition temperature of the covering layer is too high, then the protective effect is improved, but cracking in the covering layer during travel in low-temperature environment occurs
Solution Approach 1:
The patent resolves this contradiction by changing the key parameter of glass transition temperature to fall within the specific range of −70°C to −45°C. This parameter adjustment ensures the covering layer remains flexible and crack-free at low temperatures while maintaining adequate protective strength at high temperatures.
Solution Approach 2:
The patent applies local quality by optimizing the physical properties of the covering layer material specifically for the transponder protection function. The covering layer is formulated with particular rubber or elastomer types and white filler content to achieve localized properties that prevent cracking while providing protection.
2Reliability
If the relative dielectric constant of the covering layer is high, then the protective effect is improved, but the radio wave transmissivity of the transponder deteriorates and communication performance decreases
Solution Approach 1:
The patent uses composite materials by incorporating 20 phr or more of white filler into the rubber or elastomer matrix of the covering layer. This composite formulation reduces the relative dielectric constant of the covering layer to 7 or less, thereby improving radio wave transmissivity and transponder communication performance while maintaining adequate protective properties.
Solution Approach 2:
The patent applies parameter changes by controlling the relative dielectric constant of the covering layer to be 7 or less through material selection and formulation. This parameter optimization ensures sufficient radio wave penetration for transponder communication while maintaining the covering layer's protective function.
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 prevents cracking in the covering layer at low temperatures, ensures protective effects at high temperatures, and enhances communication performance, improving both transponder and tire durability without compromising the tire's surface smoothness.
Implementation Method 1
A glass transition temperature Tg of the covering layer is in a range of from −70° C. to −45° C.
Implementation Method 2
The covering layer preferably has a relative dielectric constant of 7 or less. This can ensure the radio wave transmissivity of the transponder and improve the communication performance of the transponder.
Data Source
AI summary
Provided is a pneumatic tire that can provide improved transponder durability while ensuring tire durability. The pneumatic tire includes: a tread portion (1) extending in a tire circumferential direction and having an annular shape; a pair of sidewall portions (2) disposed on both sides of the tread portion (1); and a pair of bead portions (3) disposed on an inner side in a tire radial direction of the sidewall portions (2). The tire is embedded with a transponder (20) covered with a covering layer (23). A glass transition temperature (Tg) of the covering layer (23) is in a range of from −70° C. to −45° C.