Pneumatic Tire Bead Structure for RFID Signal and Steering Stability
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Solution Overview
Problem
Pneumatic tires with embedded RFID transponders face issues with steering stability and communication performance due to the displacement of reinforcing layers and misalignment of carcass lines, which also affect the durability of the transponder.
Innovation Solution
A pneumatic tire design featuring a reinforcing layer of organic fiber cords adjacent to the bead filler, with the transponder positioned between the carcass layer and the rubber layer, ensuring adequate distance and protection, and a coating layer with a relative dielectric constant of 7 or less to enhance communication performance and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a transponder is embedded in a tire with a metal reinforcing layer, then the tire structure is strengthened, but the metal layer blocks radio waves and degrades transponder communication performance
Solution Approach 1:
The patent extracts the reinforcing layer from metal material and replaces it with organic fiber cord material, removing the harmful property (radio wave blocking) while maintaining the useful property (structural reinforcement). This resolves the contradiction by taking out the problematic metal component and substituting it with a compatible organic material.
Solution Approach 2:
The patent changes the material parameter of the reinforcing layer from metal to organic fiber cord, fundamentally altering the electromagnetic properties of the tire structure. This parameter change eliminates radio wave blocking while preserving mechanical strength, thereby resolving the contradiction between structural strength and communication performance.
2Reliability
If the transponder is disposed between the reinforcing layer and carcass layer, then the transponder is protected, but carcass lines may be misaligned and steering stability degrades
Solution Approach 1:
The patent relocates the transponder from the radial position (between reinforcing layer and carcass layer) to the circumferential position (between bead filler and tire tread), changing the spatial dimension of placement. This dimensional shift allows the transponder to be protected while avoiding interference with carcass line alignment, thereby resolving the contradiction between protection and steering stability.
3Stability of the object's composition
If a reinforcing layer is disposed on the bead filler to improve steering stability, then the tire structure is strengthened, but the transponder communication performance may be degraded depending on transponder position
Solution Approach 1:
The patent uses composite materials by combining organic fiber cord reinforcing layer with the tire structure, creating a material composition that provides both mechanical strength and electromagnetic compatibility. This composite approach allows the reinforcing layer to improve steering stability while the organic material composition ensures radio wave transmission is not blocked, resolving the contradiction between stability and communication performance.
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 improves steering stability, communication performance, and durability of the transponder by preventing radio wave blocking and protecting it from damage, while maintaining effective radio wave transmittivity and ensuring a sufficient communication distance.
Implementation Method 1
a coating layer with a relative dielectric constant of 7 or less to enhance communication performance and durability
Data Source
AI summary
Included in a pneumatic tire are a tread extending in a circumferential direction and having an annular shape, sidewalls disposed on both sides of the tread, and beads disposed on an inner side of the sidewalls in a radial direction. A bead filler is disposed on an outer circumference of a bead core of each of the beads, a carcass layer is mounted between the beads, a reinforcing layer formed of an organic fiber cord is adjacent to an outer side of the bead filler in a width direction, a height of an upper end of the reinforcing layer is equal to or greater than a height of an upper end of the bead filler, and a transponderis between a position of an outer side in the radial direction by 15 mm from an upper end of the bead core and the upper end of the reinforcing layer.