Pneumatic Tire Recess Design for Heat Dissipation and Rigidity

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Solution Overview

Problem

Existing pneumatic tires with recesses in the tread portion for heat dissipation often compromise the rigidity of the land portions, leading to insufficient heat dissipation and potential rigidity loss.

Innovation Solution

A pneumatic tire design featuring a land portion with a recess that has three or more sides forming a polygon opening on the ground contact surface, with side surfaces that approach a bottom point as they extend inward, improving heat dissipation while maintaining rigidity, and optionally incorporating a connection groove for enhanced heat release and drainage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If a narrow groove including groove wall surfaces and a groove bottom surface is formed in the land portion, then heat dissipation of the land portion is improved, but rigidity of the land portion is lowered

Engineering Contradiction:

Improveheat dissipationVSAvoidrigidity

Core Design Contradiction:

TemperatureVSStrength

Solution Approach 1:

The patent applies curvature by forming the recess with side surface portions that are inclined surfaces rather than right-angled surfaces. The side surface portions approach the bottom point as they extend inward, creating a pyramidal or conical shape that reduces stress concentration and maintains structural integrity while still providing effective heat dissipation pathways.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The patent changes the geometric parameters of the recess by defining specific angle ranges for the side surface portions (30° to 60° relative to the ground contact surface). This parameter optimization ensures sufficient heat dissipation capability while maintaining adequate rigidity of the land portion.

Inventive Principle:

Principle #35Parameter changes

2Ease of manufacture

If the side surface portions extend at a right angle from the ground contact surface inward, then manufacturing is simpler, but heat dissipation is insufficient and rigidity decreases

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidheat dissipation

Core Design Contradiction:

Ease of manufactureVSTemperature

Solution Approach 1:

The patent replaces right-angled surfaces with inclined surfaces that approach the bottom point. This curved/pyramidal configuration enhances heat dissipation by creating more effective airflow paths and reducing heat accumulation, while the specific angle ranges (30° to 60°) are chosen to balance manufacturing feasibility with performance requirements.

Inventive Principle:

Principle #14Spheroidality (Curvature)

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 enhances heat dissipation and maintains the rigidity of the land portion, preventing rigidity loss while improving drainage performance, especially on wet surfaces.

Implementation Method 1

the heat dissipation of the land portion provided in the tread portion can be improved

Methodology Applied

Scientific EffectHeat conduction: Conduction (thermal)

Implementation Method 2

a decrease in the rigidity of the land portion can be suppressed

Methodology Applied

Scientific EffectStress distribution:

Data Source

PatentUS11554611B2Pneumatic tire

Publication Date: 2023.01.17 TOYO TIRE CORP

AI summary

A pneumatic tire includes a land portion provided in a tread portion and including a recess recessed inward in a tire radial direction. The recess includes three or more sides defining an opening that opens to a ground contact surface of the land portion and forming a polygon, and three or more side surface portions defined by the sides and line segments connecting respective vertexes of the sides and a bottom point provided on an inner side of the ground contact surface in the tire radial direction. The side surface portions are formed so as to approach the bottom point as the side surface portions extend inward in the tire radial direction from the ground contact surface.