Pneumatic Tire Sound Absorber Cuts for Heat Dissipation

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Solution Overview

Problem

Existing pneumatic tires face issues with heat accumulation and durability of band-like sound absorbing members during high-speed travel and cornering, as they deform and get damaged due to stress and inadequate heat dissipation.

Innovation Solution

A pneumatic tire design featuring a band-like sound absorbing member with cuts on its end portions, angled between 40° and 90° relative to the tire's circumferential direction, which opens to relieve stress and enhance heat dissipation, improving durability and noise reduction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If the band-like sound absorbing member is directly adhered to the tire inner surface, then the adhesion is improved, but heat accumulation occurs and high-speed durability deteriorates

Engineering Contradiction:

ImproveadhesionVSAvoidheat accumulation

Core Design Contradiction:

Use of energy by moving objectVSTemperature

Solution Approach 1:

The band-like sound absorbing member is divided into multiple segments by forming cuts at regular intervals along its length. This segmentation creates gaps between segments that allow heat to dissipate from the inner surface, reducing heat accumulation while maintaining adequate adhesion through the remaining contact areas.

Inventive Principle:

Principle #1Segmentation

2Use of energy by moving object

If the band-like sound absorbing member is directly adhered to the tire inner surface, then the adhesion is improved, but the member cannot follow tire deflection during cornering and is damaged

Engineering Contradiction:

ImproveadhesionVSAvoidfollowability of tire deflection

Core Design Contradiction:

Use of energy by moving objectVSAdaptability or versatility

Solution Approach 1:

The cuts divide the band-like sound absorbing member into independent segments that can move relative to each other. This allows the segments to flex and follow the tire's deflection during cornering, reducing stress and preventing damage while maintaining adhesion through the adhered portions.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The band-like sound absorbing member is designed as a flexible structure with cuts that enable it to deform and adapt to the tire's shape changes during cornering. The flexible segments can bend and stretch to match the tire deflection, preventing damage from rigid adhesion.

Inventive Principle:

Principle #30Flexible shells and thin films

3Temperature

If cuts are formed on the band-like sound absorbing member, then heat dissipation is promoted, but the sound absorption effectiveness may be reduced

Engineering Contradiction:

Improveheat dissipationVSAvoidnoise

Core Design Contradiction:

TemperatureVSObject-generated harmful factors

Solution Approach 1:

The cuts are positioned specifically at the edges of the band-like sound absorbing member rather than uniformly across its entire surface. This local modification allows heat dissipation at the edges while preserving the continuous sound-absorbing material in the central regions, maintaining noise reduction effectiveness.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The band-like sound absorbing member utilizes porous material structure that allows heat to pass through and dissipate. The cuts enhance this effect by creating additional pathways for heat escape, while the porous nature of the material itself maintains sound absorption capabilities.

Inventive Principle:

Principle #31Porous materials

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 cuts on the band-like sound absorbing member allow for stress relief and increased heat dissipation, enhancing high-speed durability and noise reduction while maintaining effective adhesion and sound absorption.

Implementation Method 1

the heat dissipation area of the band-like sound absorbing member increases based on the cuts of the band-like sound absorbing member opening during cornering, and therefore, heat dissipation from the band-like sound absorbing member can be promoted

Methodology Applied

Scientific EffectHeat dissipation: Convection

Data Source

PatentUS11331966B2Pneumatic tire

Publication Date: 2022.05.17 THE YOKOHAMA RUBBER CO LTD

AI summary

A pneumatic tire includes: an annular-shaped tread portion extending in a tire circumferential direction; a pair of sidewall portions disposed on both sides of the tread portion; and a pair of bead portions disposed on an inner side in a tire radial direction of the sidewall portions; wherein a band-like sound absorbing member is adhered on an inner surface of the tread portion in the tire circumferential direction; and a plurality of cuts with an angle θ with regard to the tire circumferential direction within a range of 40°≤θ≤90° are formed on both end portions in a lateral direction of the band-like sound absorbing member, and the cuts are connected only to one end portion in the lateral direction of the band-like sound absorbing member.