RFID Tag Mounting in Tire Bead to Mitigate Stress
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Solution Overview
Problem
Conventional tires with embedded electronic components, such as RFID tags, face functional failure due to stress and distortion during deformation, as these components are often positioned at boundaries where stress concentrations occur.
Innovation Solution
The tire design positions the electronic component, like an RFID tag, between a rubber sheet and a pad member, with the rubber sheet covering the folding end of the carcass ply from the inner side, and a pad member configured to mitigate stress concentrations, using a coating rubber sheet with a lower modulus to protect the RFID tag from deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electronic component is arranged at the boundary surface of two different substances (carcass ply free edge), then the component is positioned within the tire structure, but stress and distortion occur upon tire deformation causing functional failure
Solution Approach 1:
The electronic component is extracted from the high-stress boundary region between carcass plies and repositioned to a low-stress region on the bead core surface. This removes the component from the harmful stress concentration zone while maintaining its functional integration within the tire structure.
Solution Approach 2:
A dedicated mounting structure consisting of a mounting portion and cover portion is introduced as an intermediary between the electronic component and the tire structure. This intermediary provides a protected, low-stress environment for the component while maintaining structural integration with the tire.
2Reliability
If the electronic component is positioned in a region with lower strain energy, then the component maintains functionality, but the positioning becomes more complex within the tire structure
Solution Approach 1:
The mounting portion and cover portion are merged into an integrated mounting structure that combines structural support and protective functions. This integration reduces the number of separate components while achieving the dual goals of low-stress positioning and functional protection.
Solution Approach 2:
The mounting structure serves multiple functions: it positions the electronic component in a low-stress region, provides mechanical support, and protects the component from environmental factors. This multi-functionality reduces overall system complexity despite the specialized positioning requirements.
Data Source
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AI summary
Provided is a tire capable of maintaining the performance of an embedded electronic component, by arranging the electronic component at a position in the tire structure which hardly receives the influences of stress and strain. A tire (1) includes: a bead core (21); a bead filler (22) which extends to an outer side in a tire-radial direction of the bead core (21); a carcass ply (23) which extends from the bead core (21) to another bead core (21), and is folded back around the bead core (21); a pad member (34) which is disposed at an outer side in a tire-width direction of the bead filler (22); and a rubber sheet (34) which is disposed between the bead filler (22) and the pad member (34) in a state covering a folding end of the carcass ply (23) which has been folded back, in which an RFID tag (40) serving as an electronic component is provided between the rubber sheet (37) and the pad member (34) .