Pneumatic Tire Electronic Component Silica Rubber

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Solution Overview

Problem

Integrating electronic components into pneumatic tires for monitoring purposes poses challenges in maintaining sufficient reading performance and tire durability, as existing methods either lead to the component falling off or decreased tire durability.

Innovation Solution

The electronic component is positioned outside the tire carcass in the axial direction, with a rubber member containing 20 parts or more of silica by mass per 100 parts of rubber, specifically in the sidewall or clinch, to enhance reading range and ozone resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the electronic component is integrated with the tire by vulcanization adhesion after molding the green tire, then the electronic component does not fall off, but the reading performance is insufficient and tire durability decreases

Engineering Contradiction:

Improveelectronic component retentionVSAvoidreading performance

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The patent applies local quality by positioning the electronic component in a specific region (sidewall or clinch) with distinct material properties. The rubber member containing 20 parts or more of silica per 100 parts of rubber component is specifically formulated for this location to optimize both retention and reading performance, rather than uniformly treating the entire tire structure.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the material composition parameter by specifying that the rubber member contains 20 parts by mass or more of silica with respect to 100 parts by mass of the rubber component. This parameter change in silica content modifies the dielectric constant and physical properties to simultaneously achieve secure electronic component retention and sufficient reading performance.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If the electronic component is integrated with the tire by vulcanization adhesion, then the electronic component does not fall off, but the tire durability decreases

Engineering Contradiction:

Improveelectronic component retentionVSAvoidtire durability

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent uses composite materials by formulating the rubber member with a specific composition including 20 parts by mass or more of silica with respect to 100 parts by mass of the rubber component. This composite material structure provides both the adhesion needed for electronic component retention and the durability required for long-term tire performance.

Inventive Principle:

Principle #40Composite materials

3Ease of manufacture

If the electronic component is adhered to the tire surface after vulcanization, then the electronic component can be easily replaced, but the electronic component falls off while traveling

Engineering Contradiction:

Improveelectronic component installationVSAvoidelectronic component retention

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent merges the electronic component with the tire structure by integrating it into the rubber member during the vulcanization process. This combining approach ensures that the electronic component becomes an integral part of the tire, preventing it from falling off while traveling, unlike surface adhesion methods.

Inventive Principle:

Principle #5Merging (Combining)

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 ensures sufficient reading performance and maintains tire durability by reducing the dielectric constant and improving ozone resistance, preventing damage to the electronic component.

Implementation Method 1

contains 20 parts by mass or more of silica with respect to 100 parts by mass of the rubber component, wherein the rubber member having the largest thickness in the tire axial direction is a clinch

Methodology Applied

Scientific EffectDielectric constant reduction: Dielectric

Implementation Method 2

improving ozone resistance, preventing damage to the electronic component

Methodology Applied

Scientific EffectOzone resistance: Ozone

Data Source

PatentEP3677439B1Pneumatic tire

Publication Date: 2022.11.02 SUMITOMO RUBBER INDUSTRIES LTD

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AI summary

Provided is a tire structure technology with which sufficient reading performance can be ensured and tire durability does not decrease, even in the case of a tire having an electronic component provided therein. A pneumatic tire having an electronic component provided therein, wherein: the electronic component is provided farther outward in a tire axial direction than a carcass; and among rubber members disposed farther outward in the tire axial direction than the electronic component, the rubber member having the greatest tire-axial-direction thickness contains silica in an amount of 20 or more parts by mass per 100 parts by mass of a rubber component.