Tire Inner Member Mounting Structure to Prevent High-Speed Cracking

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Solution Overview

Problem

Tire inner members crack during high-speed running when electronic components, such as TPMS sensors, are directly attached, leading to air leakage and peeling issues due to the difference in hardness between the electronic component mounting member and the tire inner member.

Innovation Solution

The electronic component mounting member is designed with a higher acetone extraction amount than the tire inner member, ensuring a larger content of softening agents that migrate to the tire inner member, reducing the likelihood of cracking and air leakage by maintaining flexibility and adhesion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If an electronic component mounting member is directly attached to a rubber tire inner member, then the electronic component can be mounted, but cracks occur in the tire inner member during high-speed running

Engineering Contradiction:

Improvemounting of electronic componentVSAvoidcrack resistance of tire inner member

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent introduces an electronic component mounting member as an intermediary component between the electronic component and the tire inner member. This mounting member is made of a material with specific physical properties (hardness between 40-90 on the JIS A scale, acetone extraction amount of 5-20% by mass) that serves as a buffer, preventing direct stress concentration on the tire inner member and eliminating cracks during high-speed running.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Strength

If the electronic component mounting member is made of harder material for structural integrity, then the electronic component is protected, but peeling occurs at the interface with the tire inner member

Engineering Contradiction:

Improvestructural integrity of mounting memberVSAvoidadhesion between mounting member and tire inner member

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent precisely controls the material parameters of the electronic component mounting member, specifically setting the hardness to 40-90 on the JIS A scale and the acetone extraction amount to 5-20% by mass. These parameter optimizations ensure the mounting member has sufficient structural integrity while maintaining appropriate adhesion to the tire inner member, preventing peeling during operation.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If the tire inner member is made softer to prevent cracks, then crack resistance improves, but air leakage occurs due to peeling of the mounting member

Engineering Contradiction:

Improvecrack resistance of tire inner memberVSAvoidair leakage from tire

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The electronic component mounting member acts as a protective intermediary layer that prevents direct contact and stress concentration between the tire inner member and the electronic component. This intermediary structure eliminates the root cause of peeling and subsequent air leakage, allowing the tire inner member to maintain its integrity without requiring excessive softening.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Adaptability or versatility

If high-speed running is performed with directly mounted electronic components, then TPMS functionality is achieved, but cracks and air leakage occur

Engineering Contradiction:

ImproveTPMS functionalityVSAvoiddurability during high-speed running

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent introduces the electronic component mounting member as a specialized intermediary component designed to enable TPMS functionality while preventing the harmful effects of direct mounting. This mounting member absorbs and distributes stresses during high-speed running, preventing cracks and air leakage, thereby ensuring both functionality and durability.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 design effectively prevents cracks in the tire inner member and suppresses air leakage and peeling during high-speed operations by ensuring sufficient softening agent migration and adhesion, enhancing the durability of the tire.

Implementation Method 1

the acetone extraction amount AEr (% by mass) of the electronic component mounting member and the acetone extraction amount AEi (% by mass) of the tire inner member satisfy the following (formula 1): AEr/AEi>1

Methodology Applied

Scientific EffectDiffusion: Diffusion

Data Source

PatentUS20240123765A1tire

Publication Date: 2024.04.18 SUMITOMO RUBBER INDUSTRIES LTD

AI summary

Provided is a tire in which cracks do not occur in the tire inner member during high-speed running and the occurrence of tire air leakage and detachment of electronic component mounting members is suppressed. A tire in which an electronic component mounting member for a built-in electronic component is mounted on the surface of a tire inner member, wherein the electronic component mounting member has an electronic component storage portion for storing an electronic component and a joint portion equipped with a joint surface for mounting the electronic component mounting member on the surface of the tire inner member, and the acetone extraction weight AEr (mass %) of the electronic component mounting member and the acetone extraction weight AEi (mass %) of the tire inner member satisfy (formula 1).AEr/AEi>1 (formula 1)