Segmented Sound Absorbing Material for Tire Resonance Noise Reduction
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Solution Overview
Problem
Conventional sound absorbing materials in tires face detachment issues due to stress concentration at their ends, leading to reduced adhesive force and ineffective resonance noise reduction, which can cause uniformity failures and amplified noise.
Innovation Solution
The sound absorbing material is adhered to the tire's inner liner in a circumferential direction with opposite ends separated at predetermined intervals, with wider intervals on the adhered side and narrower intervals on the free side, and inclined faces to prevent end collision, maintaining initial adhesive force and reducing resonance noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the sound absorbing material is adhered with opposite ends abutted to each other, then the coverage area is maximized, but stress concentration occurs at the opposite ends causing adhesive force deterioration and detachment
Solution Approach 1:
The sound absorbing material is segmented by creating a gap between its opposite ends, dividing the continuous material into sections that are adhered separately to the inner liner. This segmentation prevents stress concentration at the ends while maintaining overall coverage area, as the material is still extensively adhered to the liner surface throughout its length.
Solution Approach 2:
The adherence characteristics are made non-uniform along the length of the sound absorbing material. The opposite ends are designed with different adherence properties - one end is adhered to the inner liner while the other end is left unadhered or with reduced adhesion. This local differentiation prevents stress concentration at the ends while maintaining adequate coverage area through selective adherence zones.
2Object-affected harmful factors
If the sound absorbing material is made longer to reduce resonance noise, then the noise reduction effect is improved, but the adhesive force at the opposite ends deteriorates due to increased stress concentration
Solution Approach 1:
By segmenting the sound absorbing material with a gap between opposite ends, the patent enables the use of longer material lengths for improved noise reduction without the detrimental stress concentration that would occur in continuous materials. The segmentation breaks the stress transmission path, allowing extended material length while maintaining adhesive integrity at the adherence zones.
Solution Approach 2:
The patent applies different adherence qualities at different locations of the sound absorbing material. The ends are designed with specific adherence characteristics - one end adhered, the other unadhered or less adhered - which allows the material to be extended in length for better noise reduction performance while preventing adhesive failure at the critical end regions through localized stress management.
3Ease of manufacture
If the sound absorbing material is adhered using double-sided tape, then the mounting process is simplified, but stress concentration at the opposite ends causes detachment under various driving conditions
Solution Approach 1:
The segmentation of the sound absorbing material by creating a gap between opposite ends maintains the simplicity of the double-sided tape mounting process while fundamentally improving reliability. The gap prevents stress concentration that would otherwise cause adhesive failure, allowing the easy mounting process to produce a durable, reliable attachment that withstands various driving conditions without detachment.
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 configuration maintains the adhesive force and prevents uniformity failures, effectively reducing resonance noise and enhancing ride comfort by minimizing vibration and noise amplification.
Implementation Method 1
the tire acts as a resonance barrel for amplifying a sound so as to amplify the noise
Implementation Method 2
low-noise tires having a sound absorbing material mounted in the tire have been developed
Data Source
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AI summary
The present invention provides a resonance noise reduction tire having a sound absorbing material mounted therein. The resonance noise reduction tire has a sound absorbing material which is mounted therein so as to be adhered to an inner liner formed inside the tire in a circumferential direction thereof. The sound absorbing material is adhered to the inner liner in the circumferential direction thereof, and is configured so that opposite ends thereof are adhered with being separated at a predetermined interval so as not to be abutted to each other.