Run-flat Tire Shoulder Sound Absorber Reduces Heat
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Solution Overview
Problem
Run-flat tires with crescent-shaped reinforcing layers face reduced durability due to excessive bending and heat accumulation, especially when a band-like sound absorbing member is centrally positioned, leading to inadequate traveling distance and high-speed durability issues.
Innovation Solution
A band-like sound absorbing member with specific dimensions and placement on the tire's inner surface, extending in the tire's circumferential direction and positioned on shoulder regions, acts as an auxiliary member to reduce bending and heat accumulation, enhancing run-flat durability and high-speed performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a band-like sound absorbing member is arranged in the central region of the tread portion, then cavernous resonance noise is reduced, but heat accumulation increases and high-speed durability deteriorates
Solution Approach 1:
The sound absorbing member is positioned specifically in the shoulder region rather than the central region, creating local differentiation in the tire structure. This local placement strategy reduces noise in critical areas while avoiding excessive heat accumulation in the tread center, thus resolving the contradiction between noise reduction and thermal management
2Duration of action of moving object
If the tire travels for extended distances, then run-flat capability is utilized, but bending increases causing bead and tread contact that reduces run-flat durability
Solution Approach 1:
The sound absorbing member is pre-installed in the shoulder region to provide preliminary structural support and bending control. This preliminary action prevents excessive bending and bead-tread contact before they occur during extended run-flat travel, thereby maintaining run-flat durability over longer distances
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 improves run-flat durability and maintains high-speed durability by preventing excessive tire bending and reducing heat accumulation, as demonstrated by increased traveling distance and improved durability tests.
Implementation Method 1
a band-like sound absorbing member that extends in the tire circumferential direction adheres to a region of the tire inner surface corresponding to a tread portion
Data Source
AI summary
A run-flat tire is provided with: a carcass layer mounted between a pair of bead portions; and a run-flat reinforcing layer having a crescent-shaped cross-section, provided on a side wall portion on an inner side of the carcass layer in a tire width direction, a band-like sound absorbing member that extends in a tire circumferential direction adhering to a region of a tire inner surface corresponding to a tread portion, wherein the band-like sound absorbing member is locally arranged in at least one shoulder region within the region corresponding to the tread portion.