RF Tire Transponder Structure for Stress Resistance and Signal Range
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Solution Overview
Problem
Passive radiofrequency transponders integrated into tyre casings face challenges due to high thermo-mechanical stresses, which compromise their physical integrity and radiocommunication performance, and existing designs may impair the tyre's physical integrity or require costly materials to maintain performance.
Innovation Solution
A tyre casing design with a passive radiofrequency transponder featuring a helically wound conductive filamentary element with a low stiffness main core, electrical insulation, and a specific elastomer compound configuration to enhance mechanical strength and communication range, while minimizing stress on the conductive elements and ensuring robust physical integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a small diameter conductive filamentary element is used to connect the electronic chip, then the transponder can be miniaturized and production is simplified, but the physical integrity of the transponder is compromised under severe tyre operation stresses
Solution Approach 1:
The patent uses a composite structure combining a conductive filamentary element (metal) with an elastomeric compound (polymer). The conductive element provides electrical connectivity for the transponder, while the elastomeric compound provides mechanical strength and flexibility to withstand tyre operation stresses. This composite approach allows the transponder to maintain both miniaturization and physical integrity.
2Reliability
If a passive radiofrequency transponder is integrated into the tyre casing, then product identification and tracking are enabled, but the radiocommunication performance is influenced by the rubbery nature and diversity of elastomer compounds
Solution Approach 1:
The patent optimizes the dielectric properties of the elastomer compound by controlling its relative dielectric permittivity to be less than or equal to 10. This parameter change in the material properties reduces electromagnetic wave attenuation and improves radiocommunication performance while maintaining the necessary mechanical properties of the elastomer.
3Strength
If the transponder is positioned in the bead region, then it is protected within the tyre structure, but communication distance and range are reduced
Solution Approach 1:
The patent creates a localized region with optimized dielectric properties around the transponder by using an elastomeric compound with specific dielectric characteristics. This local quality improvement in the immediate vicinity of the transponder enhances signal strength and communication range, compensating for the position within the tyre structure.
4Ease of manufacture
If conventional elastomer compounds are used in the tyre casing, then manufacturing is simplified, but the radiocommunication performance of the transponder is degraded
Solution Approach 1:
The patent modifies the elastomer compound formulation to achieve a relative dielectric permittivity less than or equal to 10. This parameter change in the material properties reduces electromagnetic wave attenuation and improves radiocommunication performance while maintaining the necessary mechanical properties of the elastomer.
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 provides improved physical integrity and communication performance of the radiofrequency transponder within the tyre casing, allowing it to withstand high thermo-mechanical stresses and maintain reliable communication over long distances, while being cost-effective and durable.
Implementation Method 1
The electrical insulation device has a mean relative dielectric permittivity less than or equal to 10, preferably less than or equal to 5, over a thickness greater than or equal to one-sixth of the winding diameter D of the first primary cover filament
Data Source
AI summary
A tire having a transponder comprises: a crown which has a crown reinforcement with 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 which is formed of adjacent first wires and is anchored in each bead around a spiral formed by second wires; the transponder comprising a core defining a first axis, a first cover wire helically wound around the core and an electrical insulation device; and the first cover wire comprising at least two conductive wire elements galvanically connected to an electronic chip comprising a radiofrequency transceiver component. 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.