Tire Inner Liner Layout for RFID Communication Near Bead Cores
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Solution Overview
Problem
Conventional tires with embedded electronic components, such as RFID tags, face communication performance issues due to the adverse effects of metal bead cores, leading to potential flaws and detachment during deformation.
Innovation Solution
A tire design with an electronic component unit placed at least 5.0 mm radially outward from the bead core's outer end, covered by a resin film, and secured with a thin vulcanizing adhesive, ensuring moderate flexibility and reduced stress on the component.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the electronic component unit is embedded near the bead core, then the tire structure is compact and simple, but communication performance deteriorates due to adverse effects of the metal bead core
Solution Approach 1:
The electronic component unit is extracted from the bead core region and relocated to a position at least 5.0 mm radially outward from the bead core's outer end. This separation removes the electronic component from the adverse electromagnetic environment created by the metal bead core, thereby improving communication performance while maintaining relatively simple tire structure
Solution Approach 2:
A resin film is introduced as an intermediary layer between the electronic component unit and the inner liner. This resin film acts as a protective barrier that further isolates the electronic component from potential interference sources and provides mechanical protection, enhancing communication reliability
2Volume of moving object
If the electronic component unit is placed close to the bead core, then the tire inner cavity space is efficiently utilized, but the component experiences high stress and potential detachment during tire deformation
Solution Approach 1:
The electronic component unit is relocated from the high-stress bead core region to a position at least 5.0 mm radially outward. This extraction removes the component from areas experiencing intense deformation and stress concentration during tire usage, thereby preventing detachment and improving durability while still utilizing the tire inner cavity space efficiently
Solution Approach 2:
A vulcanizing adhesive layer is applied beforehand to the inner liner surface where the electronic component unit will be mounted. This adhesive layer is specifically designed with moderate flexibility to cushion and absorb deformation stresses, protecting the electronic component from direct mechanical stress and preventing detachment during tire deformation
3Strength
If a thick vulcanizing adhesive is used to secure the electronic component unit, then bonding strength is improved, but flexibility is reduced causing stress concentration on the component
Solution Approach 1:
The thickness of the vulcanizing adhesive layer is precisely controlled within the range of 0.1 mm to 0.5 mm. This parameter optimization achieves a balance where the adhesive provides sufficient bonding strength to secure the electronic component unit while maintaining moderate flexibility to accommodate tire deformation without causing stress concentration or component damage
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 configuration enhances communication performance by minimizing the impact of metal bead cores and improves durability by distributing stress, preventing detachment and maintaining communication integrity during tire deformation.
Implementation Method 1
a resin film which covers at least part of the electronic component
Implementation Method 2
A thickness of the vulcanizing adhesive is no more than 30 μm
Data Source
Figure 1
Figure 2
Figure 3A~3C
AI summary
A tire (1) includes: a pair of beads (11) having a bead core (21) and bead filler (22) extending to an outer side in a tire-radial direction of the bead core (21); a carcass ply (23) extending from one bead (11) to another bead (11); an inner liner (29) arranged at a tire inner cavity side of the carcass ply (23); and an electronic component unit (50) pasted to a tire inner cavity side (29C) of the inner liner (29), in which the electronic component unit (50) is arranged at a tire-radial direction position distanced at least 5.0 mm to the outer side in the tire-radial direction from a tire-radial direction outside end (21A) of the bead core (21). The tire (1) further comprises a vulcanizing adhesive (60) which joins the inner liner (29) and the electronic component unit (50). The electronic component unit (50) has an electronic component (40), and a resin film (45) which covers at least part of the electronic component (40). A thickness of the vulcanizing adhesive (60) is no more than 30 µm.