Pneumatic Tire Transponder Communication via Resistive Release Agent
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Solution Overview
Problem
Pneumatic tires with embedded transponders face communication performance issues due to the reflection of radio waves by carbon-based release agents used to prevent bonding between the tire and bladder, leading to reduced communication distances.
Innovation Solution
A pneumatic tire design with a release agent layer on the inner surface having a specific surface electric resistivity range (10^9 to 10^15 Ω·cm) and a minimal amount of carbon, ensuring reduced radio wave cancellation and improved communication performance, along with strategic placement of the transponder and use of insulators like silicone to enhance communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a carbon-based release agent is applied to the tire inner surface to prevent bonding between the green tire and bladder, then the release from the bladder is improved, but radio wave communication performance deteriorates due to reflection and cancellation of radio waves
Solution Approach 1:
The patent changes the surface electric resistivity parameter of the release agent layer from conductive (carbon-based, low resistivity) to insulating (high resistivity of 10^9 to 10^15 Ω·cm). This parameter change eliminates radio wave reflection while maintaining the release function, as the insulating property prevents electromagnetic interference without affecting the mechanical release capability from the bladder.
Solution Approach 2:
The patent uses composite release agent materials that combine insulating properties with release functionality. By selecting materials such as silicone, mica, or titanium oxide instead of pure carbon, the release agent layer becomes both functionally effective for bladder release and electromagnetically transparent for radio wave communication.
2Ease of manufacture
If a thick release agent layer is applied to ensure complete prevention of bonding, then the release function is enhanced, but communication performance worsens due to increased radio wave reflection
Solution Approach 1:
The patent changes the thickness parameter of the release agent layer to 100 μm or less. This thickness optimization ensures sufficient bonding prevention during vulcanization while minimizing radio wave reflection and absorption, thereby maintaining adequate communication distance for transponder operation.
3Ease of manufacture
If carbon-based release agent is used for its release properties, then the release function is achieved, but communication performance deteriorates due to radio wave cancellation
Solution Approach 1:
The patent converts the harmful radio wave reflection property of carbon-based materials into a beneficial insulating property. By selecting release agents with high electric resistivity, the material that would normally reflect radio waves instead becomes transparent to electromagnetic waves, eliminating the harmful effect while preserving the release function.
Solution Approach 2:
The patent employs composite or alternative materials (silicone, mica, titanium oxide) that inherently possess both release agent functionality and electromagnetic transparency, thereby eliminating radio wave cancellation effects while maintaining effective bladder release capability.
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 communication performance by minimizing radio wave interference and maintaining tire durability and air retention properties, ensuring reliable communication and durability of the transponder.
Implementation Method 1
carbon has the characteristics of being likely to reflect radio waves
Implementation Method 2
the tire inner surface in which the release agent layer is formed having a surface electric resistivity R ranging from 109 Ω·cm to 1015 Ω·cm
Implementation Method 3
the release agent includes materials such as carbon, mica, and silicone
Data Source
AI summary
A pneumatic tire includes a transponder extending along a circumferential direction embedded between a position (P1) located on an outer side of and 15 mm away from an upper end of a bead core in a radial direction and a position (P2) located on an inner side of and 5 mm away from an end of a belt layer in the radial direction, and a tire inner surface in which a release agent layer made of a release agent is formed has a surface electric resistivity of 109 Ω·cm to 1015 Ω·cm. The transponder extending along the circumferential direction is embedded between the position (P1) and the position (P2), and the amount of silicon of the release agent at least in the tire inner surface corresponding to an embedment section for the transponder is 10.0 wt % or less or a thickness of the release agent is 100 μm or less.