Pneumatic Tire Sound Absorber Width Ratio for Noise and Heat Control
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Solution Overview
Problem
Pneumatic tires face challenges in reducing tire noise through sound absorbing members, as existing solutions lead to heat buildup at high speeds, degrading high-speed durability.
Innovation Solution
A pneumatic tire design featuring a band-shaped sound absorbing member attached to the inner surface, with a center cover layer and specific width ratios to maintain durability and quietness, includes a center cover layer made from organic fiber cords and a missing portion for deformation resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a band-shaped sound absorbing member is bonded to the tire inner surface, then tire noise is reduced, but heat builds up at high speeds causing degradation of high-speed durability
Solution Approach 1:
The sound absorbing member is designed with a segmented structure including a band-shaped portion and a center portion with different width ratios relative to the belt layers. This segmentation allows optimization of noise reduction effectiveness while controlling heat buildup by adjusting the coverage area and positioning of different segments.
Solution Approach 2:
The patent applies different width ratios (SW/BW = 0.3 to 0.8) for the band-shaped sound absorbing member relative to the belt layers, creating local variations in sound absorption capacity. This local quality approach allows noise reduction in critical areas while minimizing heat buildup in other regions, resolving the contradiction between noise reduction and thermal management.
2Object-affected harmful factors
If the sound absorbing member width is increased to improve noise reduction, then quietness is enhanced, but heat buildup increases reducing high-speed durability
Solution Approach 1:
The patent optimizes the width ratio parameter (SW/BW) of the sound absorbing member to fall within 0.3 to 0.8 relative to the belt layers. This parameter change achieves the optimal balance between noise reduction effectiveness and heat buildup control, maintaining high-speed durability while providing sufficient quietness.
3Object-affected harmful factors
If the sound absorbing member is directly applied to the tire inner surface, then noise reduction is achieved, but adhesive degradation occurs at high speeds
Solution Approach 1:
The patent introduces a buffer layer between the sound absorbing member and the tire inner surface. This intermediary layer acts as a thermal and mechanical buffer, reducing heat transfer to the adhesive and minimizing stress concentration, thereby preventing adhesive degradation while maintaining noise reduction effectiveness.
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 reduces heat buildup and maintains high-speed durability while achieving excellent quietness and ride comfort by optimizing the sound absorbing member's width and placement.
Implementation Method 1
a band-shaped sound absorbing member bonded to a tire inner surface in the tread portion along the tire circumferential direction
Data Source
AI summary
A pneumatic tire includes a band-shaped sound absorbing member bonded along a tire circumferential direction to the tire inner surface in a tread portion; at least one full cover layer covering the entire width of belt layers on the outer circumferential side of the belt layers; and a center cover layer disposed on the outer circumferential side of the full cover layer, the center cover layer locally covering the tire lateral direction center region of the belt layers; a width SW of the band-shaped sound absorbing member and a width BW of the belt layers satisfying a relationship SW/BW=0.3 to 0.8, and a width CW of the center cover layer and the width SW of the band-shaped sound absorbing member satisfying the relationship CW/SW=0.05 to 0.35.