Tire Side Section Recess for Bead Heat Management

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Solution Overview

Problem

Conventional tires face challenges in suppressing temperature increases in the bead section due to heat generation, leading to rubber deterioration and increased production costs, particularly in off-the-road radial and truck bus radial tires, where friction with the rim flange and upthrust deform the tire side section, accelerating heat buildup.

Innovation Solution

A tire design featuring a circumferential recess on the outer surface of the tire side section, formed along specific arc curves to reduce the distance between high-temperature areas and heat release surfaces, combined with strategically placed blocks to enhance airflow and turbulence for improved heat dissipation, thereby reducing rubber deformation and production costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If protrusions are formed in the tire side section to facilitate heat release, then heat dissipation is improved, but the volume of rubber increases leading to more heat generation and higher production costs

Engineering Contradiction:

Improvetemperature of tire side sectionVSAvoidamount of rubber

Core Design Contradiction:

TemperatureVSQuantity of substance

Solution Approach 1:

Instead of adding protrusions to the outer surface to increase heat release area, the invention inverts the approach by forming recesses that remove rubber material. This reduces the overall rubber volume in the tire side section while creating surfaces that facilitate heat dissipation, thereby solving both the temperature control and rubber quantity issues simultaneously

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The invention changes the geometric parameters of the tire side section by forming circumferential recesses with specific depths and widths. These parameter changes reduce the rubber volume while maintaining structural integrity, thereby reducing heat generation from rubber deformation and lowering production costs

Inventive Principle:

Principle #35Parameter changes

2Temperature

If protrusions are formed to increase heat release surface area, then heat dissipation is improved, but production cost increases due to more rubber required

Engineering Contradiction:

Improvetemperature of bead sectionVSAvoidproduction cost

Core Design Contradiction:

TemperatureVSEase of manufacture

Solution Approach 1:

The invention inverts the conventional approach of adding material (protrusions) to increase heat release area. Instead, it removes rubber material to form recesses, which reduces both the rubber quantity and production cost while still achieving improved heat dissipation through the created surfaces and turbulence effects

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The invention extracts rubber material from the tire side section to form circumferential recesses. This extraction reduces the total rubber volume required, thereby lowering production costs while the recesses themselves serve as heat release surfaces that improve thermal management

Inventive Principle:

Principle #2Taking out (Extraction)

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 design effectively suppresses temperature increases in the tire side section, particularly the bead section, by facilitating heat release and reducing rubber deformation, while also lowering production costs through reduced rubber volume and improved airflow turbulence.

Implementation Method 1

a distance between a high-temperature section inside of the tire (particularly, inside of the bead section) and a heat release surface (outer surface of the circumferential recess) can be reduced by forming the circumferential recess. Thus, an effect of suppressing an increase in temperature of the rubber can be enhanced.

Methodology Applied

Scientific EffectHeat release: Conduction (thermal)

Implementation Method 2

the rotation of the tire allows the air flowing along the rim-side outer surface of the tire side section to smoothly flow into the circumferential recess along the curved sidewall surface. In other words, an increase in temperature of the rubber can be suppressed by increasing the amount of air flowing into the circumferential recess.

Methodology Applied

Scientific EffectTurbulence: Turbulence

Implementation Method 3

air flowing into the circumferential recess... increasing the amount of air flowing into the circumferential recess... suppress an increase in temperature

Methodology Applied

Scientific EffectConvection: Convection

Data Source

PatentUS10611194B2Tire

Publication Date: 2020.04.07 BRIDGESTONE CORP

AI summary

A circumferential recess is formed on the outer surface of a tire side section, the circumferential recess being depressed inward in a tread width direction and extending in a tire circumferential direction. In a cross section along the tread width direction of the tire and the tire radial direction, a rim-side outer surface formed in an area from a rim separation point, which is the outermost point in the tire radial direction that is in contact with a rim flange, to an inner end of the circumferential recess in the tire radial direction, is formed along a first arc curve having a center of a curvature radius on the inside in the tread width direction. In the cross section, a sidewall surface formed in an area from the inner end of the circumferential recess in the tire radial direction to a bottom surface of the circumferential recess is formed along a second arc curve having a center of a curvature radius on the outside in the tread width direction.