Tyre Electronic Device Rigidifying Casing and Transition Layer

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Solution Overview

Problem

Tyres with embedded electronic devices, such as RFID transponders, face mechanical endurance issues due to stress-induced strand breakage at the interface between the antenna and the rubber, leading to safety concerns.

Innovation Solution

An electronic device for tyres featuring a rigidifying casing overmoulded around the attachment parts of the conductor and support, along with intermediate and interface transition layers, which reduces stress and improves mechanical endurance by providing a progressive variation in rigidity and enhancing the reliability of electrical connections.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the electronic device is embedded directly in the rubber of the vulcanised tyre, then the device is integrated into the tyre structure, but the strands break due to stresses at the interface between the conductor and support

Engineering Contradiction:

Improvemechanical enduranceVSAvoidstrand attachment strength

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent applies composite materials by creating a multi-layer attachment structure consisting of the support, conductor, rigidifying casing, and intermediate transition layer. This composite structure distributes mechanical stresses across different material layers, preventing strand breakage at the conductor-support interface while maintaining integration with the rubber tyre structure.

Inventive Principle:

Principle #40Composite materials

2Reliability

If the casing material is made very rigid to hold the conductor and support, then the attachment reliability is improved, but the interface between materials of different rigidities creates critical zones subject to shearing forces

Engineering Contradiction:

Improveattachment reliabilityVSAvoidshearing forces at interface

Core Design Contradiction:

ReliabilityVSStress or pressure

Solution Approach 1:

The patent applies local quality by creating an intermediate transition layer with specific mechanical properties between the rigid casing and the rubber tyre. This layer has different rigidity characteristics than both the casing and the rubber, providing a gradual transition that reduces shearing forces at the interfaces while maintaining the structural integrity and attachment reliability of the overall assembly.

Inventive Principle:

Principle #3Local quality

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 solution enhances the mechanical endurance and safety of tyres by stabilizing the electronic device within the tyre, reducing the risk of strand breakage and ensuring consistent performance across varying temperatures and usage conditions.

Implementation Method 1

a rigidifying casing overmoulded at least over the part for attachment of the support and the part for attachment of the conductor

Methodology Applied

Scientific EffectOvermoulding:

Implementation Method 2

at least one intermediate transition layer at least partially overmoulded over the rigidifying casing

Methodology Applied

Scientific EffectOvermoulding:

Data Source

PatentUS9457628B2Method of manufacturing an electronic device for a pneumatic tyre

Publication Date: 2016.10.04 MICHELIN & CO (CIE GEN DES ESTAB MICHELIN)

AI summary

An electronic device, which is intended to be incorporated into a tire, includes an electronic comprises, a conductor, and a support for the electronic component. The support and the conductor are joined together by a first part for attachment of the support and a second part for attachment of the conductor. A rigidifying casing of the device is overmoulded over at least the first part for attachment of the support and the second part for attachment of the conductor. At least one intermediate transition layer is at least partially overmoulded over the rigidifying casing.