Vehicle Tyre Casing Retreading via Fluid Injection Separation

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Solution Overview

Problem

Conventional retreading methods often damage the tire carcass or tread during removal, making it difficult to separate them without causing harm and limiting the reuse of worn treads.

Innovation Solution

A method involving the injection of a fluid, such as air or liquid, between the tread and carcass to create a separation without damaging either component, allowing for easy removal and potential reuse of the tread.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If conventional machining methods are used to remove the worn tread, then the tread can be removed, but the casing is damaged in the process

Engineering Contradiction:

Improvetread removalVSAvoidcasing damage

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

A fluid intermediary (air or liquid under pressure) is introduced between the tread and casing to facilitate separation. The fluid acts as a mediator that pushes the tread away from the casing, enabling removal without direct mechanical contact that would cause damage.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The invention utilizes pneumatic or hydraulic pressure to separate the tread from the casing. By injecting fluid under pressure into the interface between the tread and casing, the method employs fluid mechanics to achieve separation without mechanical damage to the casing.

Inventive Principle:

Principle #29Pneumatics and hydraulics

2Ease of operation

If heat is applied to soften the envelope layer, then the tread separation is facilitated, but energy consumption increases

Engineering Contradiction:

Improvetread separationVSAvoidenergy consumption

Core Design Contradiction:

Ease of operationVSUse of energy by moving object

Solution Approach 1:

The invention changes the physical parameters of the envelope layer by heating it to a softened state. This parameter change (temperature increase) makes the material more compliant and easier to separate from the tread, reducing the mechanical force required and potentially lowering overall energy consumption compared to forceful mechanical separation.

Inventive Principle:

Principle #35Parameter changes

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

Facilitates the separation of the tread and carcass without damaging either, enabling the reuse of treads with minimal wear and allowing for efficient retreading of vehicle tires while preserving the integrity of the carcass.

Implementation Method 1

a fluid is injected into a casing between a tread and a support for this tread to keep them away from each other

Methodology Applied

Scientific EffectFluid pressure: Pressure Increase

Implementation Method 2

prior to the injection, a layer of the envelope is softened. After this softening, which can take place by induction heating, the fluid is injected into the softened layer.

Methodology Applied

Scientific EffectInduction heating: Induction Heating

Data Source

PatentEP2931510B1Method for retreading a vehicle tyre casing

Publication Date: 2019.08.14 MICHELIN & CO (CIE GEN DES ESTAB MICHELIN)

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AI summary

In the method for retreading a vehicle tire casing, a fluid is injected into a casing between a tread and a tread backing in order to space them apart.