Heavy-Duty Tire Bead Layout for Protected RFID Tag Placement
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Solution Overview
Problem
Heavy duty pneumatic tires with RFID tags placed in the bead portion face increased risk of breakage due to strain during load application, while placement in the side portion risks external damage.
Innovation Solution
A heavy duty pneumatic tire design featuring a tag assembly with an RFID tag covered by a specific type of covering rubber, positioned between the outer apex and the chafer in the axial direction, with a complex elastic modulus ratio of the inner apex to the outer apex between 10 and 21, and a specific installation height and thickness configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an RFID tag is placed in a side portion of the tire, then the tag is easily accessible and visible, but the risk of breakage due to external damage increases
Solution Approach 1:
The RFID tag is relocated from the traditional side portion (lateral dimension) to the bead portion (radial/axial dimension), changing the spatial dimension of tag placement. This dimensional shift allows the tag to be positioned in a location that is both protected from external damage and maintains functional accessibility through the tire structure.
Solution Approach 2:
The RFID tag is nested within the bead portion structure, specifically positioned between the inner apex and outer apex of the bead. The tag is embedded in the tire's internal structure rather than exposed on the exterior, creating a nested configuration that protects the tag while maintaining its functionality within the tire system.
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 tire design reduces the risk of RFID tag damage while maintaining the durability of the bead portion, ensuring effective strain management and ride comfort during load application.
Implementation Method 1
a ratio of a complex elastic modulus of the inner apex to a complex elastic modulus of the outer apex is not less than 10 and not greater than 21, wherein said complex elastic modulus is measured using a viscoelasticity spectrometer according to the standards of JIS K6394
Data Source
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AI summary
A heavy duty pneumatic tire 2 includes an apex 40 including an inner apex 40u and an outer apex 40s, and a tag assembly 28 including an RFID tag 78 and a covering rubber 80 covering the RFID tag 78. A ratio of a complex elastic modulus of the inner apex 40u to a complex elastic modulus of the outer apex 40s is not less than 10 and not greater than 21. The tag assembly 28 is located outward of the outer apex 40s in an axial direction, and a distance in a radial direction from a bead base line to the RFID tag 78 is not less than 120% and not greater than 145% of a distance in the radial direction from the bead base line to an end 54 of a turned-up portion 52 of a carcass 10.