Pneumatic Tire Noise Damper Segmentation and Coating
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Solution Overview
Problem
Pneumatic tires face issues with thermal failures and vibrations due to noise dampers under high-speed conditions, particularly because existing dampers can absorb water, leading to rotational imbalances and heat-related issues.
Innovation Solution
The use of small, spongelike multi-cellular noise dampers with a water-impermeable outer coating, strategically positioned within the tire cavity to extend circumferentially, helps prevent water absorption and heat accumulation, while maintaining effective noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a noise damper made of spongelike material is disposed in the tire cavity to reduce resonance noise, then noise reduction is improved, but water absorption occurs leading to rotational imbalance and vibrations
Solution Approach 1:
The noise damper is divided into a plurality of small dampers arranged circumferentially in the tire cavity. Each small damper has a volume of 0.0005 to 0.05 m³, and the total volume of all dampers is 0.4 to 20% of the tire cavity volume. This segmentation prevents water accumulation that would cause rotational imbalance while maintaining effective noise reduction through distributed damping elements.
Solution Approach 2:
A water-impermeable coating is applied to the surface of the spongelike noise damper material. This thin film barrier prevents water from penetrating into the porous structure of the damper, eliminating the risk of water absorption导致的 rotational imbalance and vibrations while allowing the underlying spongelike material to continue absorbing noise effectively.
2Object-affected harmful factors
If a noise damper is used in the tire cavity, then noise reduction is improved, but heat generation and heat accumulation occur under very high speed conditions
Solution Approach 1:
The noise damper is divided into a plurality of small dampers arranged circumferentially in the tire cavity. Each small damper has a volume of 0.0005 to 0.05 m³, and the total volume of all dampers is 0.4 to 20% of the tire cavity volume. This segmentation reduces heat accumulation by distributing the heat generation across multiple smaller elements with increased surface area for heat dissipation, while maintaining effective noise reduction through distributed damping elements.
Solution Approach 2:
The total volume of noise dampers is controlled to be within 0.4 to 20% of the tire cavity volume, and each small damper is sized at 0.0005 to 0.05 m³. This parameter optimization ensures sufficient noise damping while limiting heat generation and improving heat dissipation. The specific volume ratios balance noise reduction effectiveness with thermal management under high-speed conditions.
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
This solution effectively prevents thermal failures and vibrations during high-speed operations by ensuring the dampers remain dry and reducing noise levels by 2 dB or more, enhancing durability and stability.
Implementation Method 1
a water-impermeable outer coating to prevent water from infiltrating into the spongelike multi-cellular material
Implementation Method 2
a noise damper made of a spongelike multi-cellular material... reducing noise levels by 2 dB or more
Implementation Method 3
a noise damper made of a spongelike material which is disposed in the tire cavity so as to extend circumferentially of the tire... reduce their noise
Data Source
AI summary
A pneumatic tire with a noise damper made of a spongelike multi-cellular material is disclosed. The noise damper is divided into small dampers to improve the high-speed durability of the tire. The noise damper is provided with a water-impermeable outer coating to prevent water from infiltrating into the spongelike multi-cellular material during transporting, store keeping and the like.