Tire Electronic Member Positioning for RFID Interference
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Solution Overview
Problem
The existing positioning of electronic members, such as RFID transponders, in tires is not optimal for radio frequency data transmission due to the proximity of metal masses, particularly metal wires in the carcass ply, which causes interference and affects the mechanical endurance of the tire.
Innovation Solution
The electronic member is positioned in a tire with an annular bead wire and a toroidal carcass ply, where the interface between a rubber mass and the electronic member extends radially from the free edge of the folded carcass ply portion to a circumferential junction, avoiding the volume between the folded and facing portions of the carcass ply, and is offset from metal reinforcing wires and edges to minimize interference and stress, using a rubber coating with a lower dielectric constant to enhance data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the electronic member is positioned in the volume between the folded portion of the carcass ply and the facing portion, then it is easier to integrate into the tire structure, but the data transmission is disturbed by proximity to metal masses
Solution Approach 1:
The electronic member is extracted from the problematic volume between the folded and facing carcass portions and repositioned in the bead region. This removes the source of interference with data transmission while maintaining integration into the tire structure through the bead wire assembly.
Solution Approach 2:
The electronic member is repositioned from the radial dimension (between carcass layers) to the axial dimension (in the bead region along the tire's axis). This dimensional shift places it away from interfering metal masses while maintaining structural integration.
2Device complexity
If the electronic member is positioned close to the free edge of the folded carcass ply, then it simplifies positioning, but it increases stress and reduces mechanical endurance
Solution Approach 1:
The bead wire assembly serves as an intermediary structure that holds the electronic member at an optimal distance from the free edge of the folded carcass ply. This intermediary positioning reduces stress concentration while maintaining simple integration through the bead region.
3Strength
If metal masses are placed close to the electronic member for structural support, then structural strength is improved, but interference with radio frequency transmission increases
Solution Approach 1:
The bead region is designed with specific local quality characteristics - it provides structural support through the bead wire while creating a localized zone that is radially offset from the electronic member. This allows structural strength without radio frequency interference in the critical transmission zone.
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
This optimized positioning improves data transmission efficiency while maintaining the mechanical endurance of the tire by reducing stress and interference from metal masses and protecting the electronic member from external stresses.
Implementation Method 1
using a rubber coating with a lower dielectric constant to enhance data transmission
Data Source
AI summary
A tire is disclosed that includes at least one annular bead wire forming a body of revolution about a reference axis. A carcass ply of generally toroidal shape about the same axis as the bead wire has a portion that is folded around the wire. A materials interface is defined at least in part by the junction between a rubber first mass and a second mass that includes an electronic member. By way of example, the electronic member is a passive radiofrequency identification transponder. The interface extends from a free edge of the folded portion of the carcass ply radially away from the reference axis to a circumferential junction line between the interface and the carcass ply.