Pneumatic Tire Radial Protrusions Heat Dissipation
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Solution Overview
Problem
Pneumatic tires experience temperature rises during high-speed driving, leading to durability issues, particularly in off-the-road radial tires and run-flat tires, where existing solutions either cause separation of reinforcing members or degrade steering stability and ride quality.
Innovation Solution
The implementation of radial protrusions with varying heights and inclined faces on the tire surface, which enhance airflow interaction with the tire, allowing for effective heat exchange and reducing temperature rise without compromising tire stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If reinforcing members are provided to the carcass layer and bead portions to suppress deformation, then the temperature rise in the pneumatic tire is suppressed, but the reinforcing members may separate under load and cause other damage
Solution Approach 1:
The patent removes the reinforcing members from the tire structure and replaces them with radial protrusions on the tread surface. These protrusions generate airflow turbulence to cool the tire through convective heat transfer, eliminating the separation problem while maintaining temperature control
Solution Approach 2:
The patent uses airflow (pneumatics) generated by the rotating tire to cool the tire surface. The radial protrusions create turbulence in the air flow, enhancing convective heat transfer from the tire surface to the surrounding air, thereby suppressing temperature rise without mechanical reinforcing members
2Temperature
If reinforcing members are provided to the tire side portions to suppress deformation, then the temperature rise is suppressed, but the rigidity of the tire side portions increases making the pneumatic tire more bouncy and degrading steering stability and ride quality
Solution Approach 1:
The patent removes the reinforcing members that caused excessive rigidity and replaces them with radial protrusions that cool the tire through airflow turbulence. This maintains tire flexibility for good ride quality while suppressing temperature rise through convective cooling
Solution Approach 2:
The patent changes the approach from mechanical reinforcement (increasing rigidity) to thermal management through airflow modification. The radial protrusions alter the airflow parameters to enhance heat dissipation, achieving temperature control without affecting tire mechanical properties
3Temperature
If the surface area of the pneumatic tire is increased by providing ridges to improve radiation performance, then heat radiation is improved, but the outer surface is preferably made of rubber material having low heat conductivity which prevents conduction of friction heat
Solution Approach 1:
The patent uses airflow (pneumatics) to transfer heat from the tire surface to the surrounding air through convection. The radial protrusions enhance this convective heat transfer by creating turbulence, bypassing the need for high thermal conductivity materials and directly addressing the heat dissipation need
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 solution effectively suppresses temperature rise in tire side portions, improving durability by promoting active heat exchange between airflow and the tire surface while maintaining ride quality and steering stability.
Implementation Method 1
airflow crosses over the radial protrusion and then flows toward the tire surface in the direction substantially perpendicular thereto at a position behind the radial protrusion in the tire rotation direction, actively exchange heat with each other
Data Source
AI summary
The aspect of the present invention is a pneumatic tire comprising a plurality of radial protrusions 60 each extending in a tire radial direction on a tire surface 31 and having a shape protruding from the tire surface outward in a tire width direction, wherein the plurality of radial protrusions 60 are provided radially with a tire rotation axis as a center, the plurality of radial protrusions 60 each have a low protrusion portion 63 and a high protrusion portion 64, and a height of the low protrusion portion measured in the tire width direction hs is lower than a maximum height of the high protrusion portion h measured in the tire width direction.