Heavy-Duty Tire Bead Layout for RFID Signal and Strain Protection
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Solution Overview
Problem
In heavy duty tires, the placement of RFID tags near metal components like steel cords can disturb radio waves and increase the risk of damage due to strain concentration, especially with the addition of fiber reinforcing layers.
Innovation Solution
The RFID tag is positioned between the turned-up portion and the outer end of the apex, with the steel reinforcing layer wrapping the inner portion of the bead and the fiber reinforcing layer's ends spaced apart to reduce strain concentration and maintain durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the RFID tag is placed near metal components such as steel cords to ensure proper positioning in the bead portion, then the tag can be securely located, but radio waves may be disturbed affecting communication quality
Solution Approach 1:
The RFID tag is extracted from the immediate vicinity of metal components (steel cords) and repositioned to a location where it can still be securely mounted in the bead portion but at a sufficient distance from metal components to avoid radio wave interference, thus separating the tag from the harmful metallic environment
Solution Approach 2:
A non-metallic intermediary structure or material is introduced between the RFID tag and metal components (steel cords), such as a non-conductive adhesive layer or positioning structure made of polymer material, which allows the tag to be securely mounted while blocking or reducing the electromagnetic interference from metal components
2Strength
If the fiber reinforcing layer is added to the steel reinforcing layer to increase carrying capacity and reduce uneven wear, then durability is improved, but strain concentration occurs at the ends of the reinforcing plies increasing damage risk
Solution Approach 1:
The end portions of the fiber reinforcing layer are positioned to overlap with the end portions of the steel reinforcing layer, creating a localized reinforcement zone where the fiber layer provides additional strength precisely where strain concentration is most likely to occur, rather than uniformly distributing the reinforcement
Solution Approach 2:
The fiber reinforcing layer is positioned in advance to overlap with the steel reinforcing layer at the critical end portions, providing a cushioning effect that prevents strain concentration and potential damage before it can occur during tire operation
Data Source
AI summary
A tire 2 includes a pair of beads 10, a carcass 12, a pair of steel reinforcing layers 20, a pair of fiber reinforcing layers 26, and a tag member 28. Each bead 10 includes an apex 40. A carcass ply 48 included in the carcass 12 includes a ply body 50 and a pair of turned-up portions 52. An outer end PR1 of each fiber reinforcing layer 26 is located between an end PF of the turned-up portion 52 and an outer end PA of the apex 40. An RFID tag 62 of the tag member 28 is located between the end PF of the turned-up portion 52 and the outer end PA of the apex 40. In the fiber reinforcing layer 26, an outer end 60f of a second reinforcing ply 60 is located radially outward of an outer end 58f of a first reinforcing ply 58.