Pneumatic Tire Projections Laminar Flow Heat Dissipation
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Solution Overview
Problem
Existing pneumatic tire designs do not effectively enhance heat radiation properties beyond turbulence creation in air flow, which limits tire durability.
Innovation Solution
A pneumatic tire with projections on the side portions, where the thickness is less than the width, promoting a laminar flow that increases the velocity gradient and enhances heat radiation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If projections are formed on tire side portions to create turbulence in air flow, then heat radiation property is enhanced, but device complexity increases
Solution Approach 1:
The invention changes the geometric parameters of the projections, specifically setting the thickness to be smaller than the width (thickness/width ratio < 1), which fundamentally alters the flow regime from turbulent to laminar. This parameter change resolves the contradiction by achieving enhanced heat radiation through laminar flow without requiring complex turbulent flow generation structures.
Solution Approach 2:
Instead of following the conventional approach of creating turbulence to enhance heat radiation, the invention inverts the approach by deliberately creating and maintaining laminar flow. This inversion of the conventional wisdom allows for effective heat radiation enhancement while avoiding the complexity associated with turbulent flow structures.
2Temperature
If projection width is increased to ensure enough heat radiation area, then heat radiation efficiency is improved, but tire side portion space is consumed
Solution Approach 1:
By changing the thickness/width ratio parameter to be less than 1, the invention optimizes the projection geometry to maximize heat radiation area within the available tire side portion space. This parameter optimization allows sufficient heat radiation area without excessive consumption of tire side portion area.
Solution Approach 2:
The invention applies local quality by creating projections with specific dimensional characteristics (thickness < width) at specific locations on the tire side portions. This localized geometric optimization ensures effective heat radiation while minimizing the overall space consumption on the tire side portions.
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 promotes heat radiation through laminar flow, enhancing tire durability by ensuring a sufficient heat radiation area and maintaining efficiency even at high speeds.
Implementation Method 1
an air flow in the vicinity of the tope surface of the projection forms a laminar flow. An air flow made of a laminar flow (a laminar-flow boundary) has a large velocity gradient and, hence, heat radiation due to air cooling of the top surface of the projection can be effectively promoted
Implementation Method 2
a speed of the fluid is rapidly lowered in the vicinity of a surface of the object due to viscosity of the fluid. Outside a region where the speed of the fluid rapidly changes (a boundary layer), a region where the speed of the fluid is not influenced by viscosity is formed
Implementation Method 3
heat radiation due to air cooling of the top surface of the projection can be effectively promoted
Data Source
AI summary
A pneumatic tire includes a projection formed on a surface of a tire tread portion. A thickness of the projection, which is a distance from the surface of the tread portion to a top surface of the projection, is smaller than a width of the projection, which is a size of the top surface in a tire circumferential direction. The width of the projection is equal to or more than 10 mm.