Polyester Carcass Tire Layout for RFID Signal and Steering Stability
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Solution Overview
Problem
Pneumatic tires embedded with RFID transponders face challenges in achieving both steering stability and communication performance due to the trade-offs between using rayon and polyester fiber cords, where rayon provides stability but degrades communication due to high moisture absorption, and polyester offers poor stability with low rigidity.
Innovation Solution
A pneumatic tire design featuring a carcass layer made of polyester fiber cords with specific elongation and moisture absorption properties, strategically positioning the transponder between the carcass layer and rubber layers to minimize metal interference, and using a coating layer with a relative dielectric constant of 7 or less to enhance communication and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a transponder is embedded in a pneumatic tire with a carcass layer made of rayon fiber cord, then steering stability is improved, but communication performance of the transponder is degraded
Solution Approach 1:
The patent changes the material parameter from rayon fiber cord to polyester fiber cord for the carcass layer, while also adjusting the transponder positioning parameters (radial position between 15mm from bead core upper end and 5mm from belt layer end) to resolve the contradiction between steering stability and communication performance
Solution Approach 2:
The patent introduces a coating layer with specific dielectric properties as an intermediary between the transponder and the surrounding tire structures, mediating the interaction between the transponder and moisture to protect communication performance while maintaining steering stability
2Reliability
If a transponder is embedded in a pneumatic tire with a carcass layer made of polyester fiber cord, then communication performance may be maintained, but steering stability is insufficient
Solution Approach 1:
The patent specifies precise parameter ranges for the polyester fiber cord (elongation at break: 20-30%, intermediate elongation: 4.0-6.0%, twist coefficient: 1800-2200) to ensure both communication performance and steering stability are achieved simultaneously
Solution Approach 2:
The patent optimizes the dynamic mechanical properties of the polyester fiber cord by controlling elongation and twist parameters, enabling the material to provide both the moisture resistance needed for communication and the rigidity needed for steering stability
3Device complexity
If the transponder is disposed close to the bead core or belt layers, then device complexity is reduced, but metal interference occurs and communication performance is degraded
Solution Approach 1:
The patent defines a specific radial position parameter range for the transponder (between 15mm from bead core upper end and 5mm from belt layer end) that optimizes communication performance while maintaining practical manufacturing simplicity
Solution Approach 2:
The patent positions the transponder in a specific radial dimension of the tire structure, utilizing the radial space between the bead core and belt layers to achieve optimal communication performance without complicating the overall device design
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 design ensures improved steering stability comparable to rayon fiber cords while maintaining effective communication performance by reducing moisture absorption and metal interference, and enhancing durability through proper positioning and coating of the transponder.
Implementation Method 1
the coating layer has a relative dielectric constant of 7 or less, thus radio wave transmittivity is enhanced
Data Source
AI summary
In a pneumatic tire in which a carcass layer is turned up from a tire inner side to a tire outer side around a bead core, the carcass layer is formed of a reinforcing cord made of a polyester fiber cord, elongation at break of the reinforcing cord of the carcass layer ranges from 20% to 30%, and a transponder is disposed between a position of an outer side in a tire radial direction by 15 mm from an upper end of the bead core and a position of an inner side in the tire radial direction by 5 mm from an end of a belt layer.