Segmented Sound-Absorbing Member for Tire Noise Reduction

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Pneumatic tires face noise issues due to cavity resonance and shear strain on sound-absorbing members, leading to peeling problems when bonded to the tire's inner surface.

Innovation Solution

A belt-shaped sound-absorbing member is bonded to the tire's inner surface with a combination of bonded and unbonded regions, divided along the circumferential and widthwise directions, using an adhesive layer, to mitigate shear strain and prevent peeling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a sound-absorbing member is bonded to the inner surface of the tire, then noise reduction is achieved, but shear strain occurs on the bonding surface leading to peeling

Engineering Contradiction:

ImprovenoiseVSAvoidbonding durability

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The bonding surface is divided into multiple bonded regions separated by unbonded regions. This segmentation reduces the continuous shear strain on the bonding surface by breaking it into discrete segments, preventing peeling while maintaining noise reduction in each bonded region.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the bonding surface have different properties: bonded regions provide noise reduction through sound absorption, while unbonded regions provide stress relief by preventing shear strain accumulation. This local differentiation allows the system to simultaneously achieve noise reduction and bonding durability.

Inventive Principle:

Principle #3Local quality

2Speed

If the tire undergoes radial growth during inflation or high-speed travel, then the tire functions properly, but shear strain is generated in the bonding surface of the sound-absorbing member

Engineering Contradiction:

Improvetraveling speedVSAvoidshear strain

Core Design Contradiction:

SpeedVSStress or pressure

Solution Approach 1:

The bonding surface is segmented into multiple bonded regions separated by unbonded regions. This segmentation reduces the continuous shear strain on the bonding surface by breaking it into discrete segments, preventing peeling while maintaining noise reduction in each bonded region.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The bonding configuration changes from a continuous bonded surface to a segmented pattern with alternating bonded and unbonded regions. This parameter change allows the system to accommodate radial growth and shear strain while maintaining functional performance.

Inventive Principle:

Principle #35Parameter changes

3Ease of operation

If the tread section deforms during ground contact, then the tire provides traction, but shear strain is generated in the bonding surface of the sound-absorbing member

Engineering Contradiction:

ImprovetractionVSAvoidshear strain

Core Design Contradiction:

Ease of operationVSStress or pressure

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

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 effectively reduces shear strain and maintains noise-reducing effects over extended periods by preventing peeling of the sound-absorbing member.

Implementation Method 1

a belt-shaped sound-absorbing member is bonded via an adhesive layer to an inner surface of the tire

Methodology Applied

Scientific EffectAdhesive bonding: Adhesive

Implementation Method 2

cavity resonance caused by the vibration of air filling the tire is one cause of noise production

Methodology Applied

Scientific EffectSound absorption: Acoustic Absorption

Data Source

PatentUS11214101B2Pneumatic tire

Publication Date: 2022.01.04 THE YOKOHAMA RUBBER CO LTD

AI summary

A pneumatic tire according to the present technology is a pneumatic tire provided with a tread section, sidewall sections, and bead sections, a belt-shaped sound-absorbing member being bonded via an adhesive layer to an inner surface of the tire in a region corresponding to the tread section along the circumferential direction of the tire, wherein a bonding surface of the sound-absorbing member is provided with a bonded region that is bonded to the inner surface of the tire and an unbonded region that is not bonded to the inner surface of the tire, and the bonded region is divided by the unbonded region into a plurality of divisions along the circumferential direction of the tire.