Tire Inner-Cavity Sensor Mounting for Impact Peel Resistance
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Solution Overview
Problem
The concern with existing tire pressure monitoring systems (TPMS) is that electronic components, being metal, tend to peel off when subjected to large impacts during high-speed running, particularly over road irregularities.
Innovation Solution
A tire design with an electronic component mounting member that includes an electronic component storage portion and a joint portion, where the complex elastic modulus of the joint portion is softer than the tread rubber, ensuring the center of the joint surface avoids circumferential grooves, and specific viscoelasticity ratios are maintained to minimize peeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If electronic components are directly attached to rubber tire surface, then mounting simplicity is improved, but peeling resistance deteriorates under large impact during high-speed running
Solution Approach 1:
An electronic component mounting member is introduced as an intermediary between the electronic component and the tire inner member. This mounting member includes a joint portion that bonds to the tire inner member and a storage portion that holds the electronic component, thereby preventing direct attachment while ensuring reliable bonding under impact conditions
Solution Approach 2:
The electronic component mounting member is made of rubber material with specific viscoelasticity characteristics (complex elastic modulus E* between 1-10 MPa at 30°C), creating a composite structure that combines the flexibility of rubber with the functional requirements of electronic component mounting and impact resistance
2Strength
If the joint portion uses stiffer material for stronger bonding, then bond strength is improved, but peeling resistance under impact deteriorates
Solution Approach 1:
The complex elastic modulus E* of the joint portion is specifically controlled to be between 1-10 MPa at 30°C, which is softer than the tread rubber (E* > 10 MPa). This parameter optimization ensures the joint portion can deform under impact to absorb stress while maintaining adequate bond strength
Solution Approach 2:
Different portions of the electronic component mounting member have different material properties: the joint portion has lower stiffness (E* = 1-10 MPa) for impact absorption, while the storage portion can have different characteristics for component protection, creating localized quality variations within the same component
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 provides excellent peeling resistance, preventing the electronic component mounting member from detaching even under high-impact conditions during high-speed running.
Implementation Method 1
the complex elastic modulus E* r (MPa) of the joint portion at 30°C and the complex elastic modulus E* t (MPa) of the tread rubber constituting the tread portion at 30°C satisfy the following (formula 1)
Data Source
Figure 1
Figure 2(A)~2(B)
Figure 3(A)~4
AI summary
Provided is a tire having excellent peeling resistance such that it is unsusceptible to having an electronic component peel off from the surface of the tire, even when a large impact is exerted on the tire during high-speed travel. An electronic component attachment member for embedding an electronic component is attached to a surface of a tire inner member disposed in a tire inner cavity. The electronic component attachment member comprises an electronic component storage part for storing an electronic component, and a bonding part having a bonding surface for attaching the electronic component attachment member to the surface of the tire inner member. A line that passes through the center point of the bonding surface of the electronic component attachment member with the tire inner cavity surface and that is perpendicular to the surface profile of a tread part does not pass through a circumferential-direction groove formed in the surface of the tread part, and the complex elastic modulus E*t (MPa) of tread rubber constituting the tread part at 30°C satisfy E*r/ E*t.