Tyre Transponder Structure for Stress-Resistant RF Communication
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Solution Overview
Problem
Passive radio frequency transponders integrated into pneumatic envelopes face challenges due to severe thermo-mechanical stresses, which compromise their physical integrity and communication performance, and the rubbery nature of the envelopes affects radiocommunication.
Innovation Solution
A pneumatic envelope design with a passive radio frequency transponder featuring a conductive wire element with a diameter between 0.05 and 0.15 millimeters, a main core with lower rigidity than the wire, and an electrical insulation device with a relative dielectric permittivity less than 10, positioned to withstand stresses and maintain communication performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a passive radiofrequency transponder with a thin conductive wire element is integrated into a pneumatic envelope, then the manufacturing cost is reduced and miniaturization is achieved, but the physical integrity of the transponder is compromised under severe thermomechanical stresses
Solution Approach 1:
The patent applies composite materials by combining the thin conductive wire element (0.05-0.15mm diameter) with a flexible support structure made of elastomeric material having specific mechanical properties (modulus of elasticity between 0.1-10 MPa). This composite construction allows the delicate wire to be embedded in a protective matrix that distributes thermomechanical stresses, preventing wire breakage while maintaining the cost benefits of using thin wire for RFID functionality.
Solution Approach 2:
The patent utilizes flexible shells by employing an elastomeric support structure with low modulus of elasticity (0.1-10 MPa) that can deform elastically under thermomechanical stresses. This flexible matrix surrounds and protects the rigid conductive wire element, allowing the assembly to withstand bending, stretching, and compression forces during tire operation without compromising wire integrity, while the thin film nature maintains manufacturing efficiency.
2Reliability
If the transponder is integrated into the pneumatic envelope, then identification and tracking are enabled, but the radiocommunication performance is affected by the rubbery nature of the envelope
Solution Approach 1:
The patent introduces an intermediary elastomeric material with specific electromagnetic properties (dielectric constant between 2-20) that acts as a mediator between the conductive wire element and the surrounding pneumatic envelope. This intermediate layer minimizes electromagnetic interference and signal attenuation caused by the rubbery environment, allowing reliable radiofrequency communication while maintaining the benefits of integration within the tire structure.
3Volume of moving object
If the conductive wire element has a small diameter to connect to the electronic chip, then miniaturization is achieved, but the wire is more susceptible to damage from thermomechanical stresses
Solution Approach 1:
The patent applies the nested doll principle by placing the thin conductive wire element (0.05-0.15mm diameter) inside a protective elastomeric matrix. The wire is nested within this flexible support structure, which provides mechanical strength and damage protection. This nested configuration allows the use of very thin wire for miniaturization and chip connection while the surrounding elastomeric layer absorbs and distributes mechanical stresses, preventing wire failure.
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 enhances the physical integrity and communication distance of the transponder, allowing reliable operation under demanding conditions while minimizing mechanical stress on the conductive wire elements and maintaining radio frequency performance.
Implementation Method 1
an electrical insulation device with an average relative dielectric permittivity less than or equal to 10, preferably less than 5, over a thickness greater than or equal to one sixth of the winding diameter D
Data Source
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AI summary
The invention relates to a tyre having a transponder, comprising: - a crown which has a crown reinforcement having an axial end at each edge, joined at each of its axial ends to a bead, which has an inner end, by a sidewall; - a carcass reinforcement ply which is formed of parallel reinforcements and is anchored in each bead around a bead core to form a main part and a turn-up; - the transponder comprising a core defining a first axis, a first cover wire helically wound around the core and an electrical insulation device; - the first cover wire comprising at least two conductive wire elements galvanically connected to an electronic chip comprising a radiofrequency transceiver component, characterized in that the thickness of the elastomer mixture separating the outer cover wire, which is located furthest outwards from the first axis, and the reinforcements is greater than 0.5 millimeter.