Segmented Sound Absorbing Member for Tire Noise and Heat Management
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Solution Overview
Problem
Pneumatic tires face issues with noise reduction due to cavernous resonance, where existing sound absorbing members either deform or accumulate heat, leading to durability problems when bonded directly to the tire inner surface, and fail to alleviate tension during inflation.
Innovation Solution
A band-like sound absorbing member with cuts on its outer circumferential surface is bonded to the tire inner surface, allowing deformation with increased tire diameter, alleviating tension, improving durability, and enhancing heat dissipation through increased surface area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the band-like sound absorbing member is directly bonded to the tire inner surface, then the sound absorbing member can be fixed securely, but heat accumulates in the tread portion causing degradation of high-speed durability
Solution Approach 1:
The band-like sound absorbing member is divided into multiple segments by forming cuts in the circumferential direction. These cuts create gaps that allow heat to dissipate from the tread portion to the tire inner surface, reducing heat accumulation while maintaining secure bonding through the adhesive layers on each segment
2Reliability
If the band-like sound absorbing member is directly bonded to the tire inner surface, then the sound absorbing member is fixed securely, but the sound absorbing member cannot be deformed with tire deflection and is broken when the tire rolls
Solution Approach 1:
The sound absorbing member is segmented by cuts that allow each segment to deform independently with tire deflection during rolling, preventing breakage while the adhesive layers maintain secure bonding of each segment to the tire inner surface
Solution Approach 2:
The band-like sound absorbing member is constructed as a flexible structure with adhesive layers that allow it to conform to tire deflection and deformation during rolling, maintaining bonding while accommodating dynamic tire behavior
3Strength
If cuts are formed in the inner circumferential surface of the band-like sound absorbing member, then the sound absorbing member can be deformed with tire rolling, but tension is generated during inflation and the sound absorbing member is liable to be peeled off
Solution Approach 1:
Instead of continuous circumferential cuts that create peeling tension, the sound absorbing member is segmented by cuts in the circumferential direction that allow deformation without compromising bonding, as each segment remains independently bonded to the tire inner surface
Solution Approach 2:
The flexible band-like structure with adhesive layers allows the sound absorbing member to deform with tire rolling while maintaining bonding, as the flexible segments can accommodate deformation without generating peeling forces
4Ease of manufacture
If the sound absorbing member is made from a porous material and fixed with an elastic band, then the sound absorbing member can be installed easily, but the elastic band deforms when a vehicle is driven at high speeds
Solution Approach 1:
The elastic band is replaced by direct bonding of the sound absorbing member to the tire inner surface using adhesive layers, eliminating the deformation problem of the elastic band at high speeds while maintaining easy installation through the bonding process
Solution Approach 2:
Adhesive layers are introduced as an intermediary between the sound absorbing member and the tire inner surface, providing secure bonding without the deformation issues of elastic bands at high speeds
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 reduces noise, improves durability by preventing breakage and heat accumulation, and enhances high-speed performance by regulating movement and suppressing rubbing between parts.
Implementation Method 1
a band-like sound absorbing member bonded to an inner surface of the tread portion along the tire circumferential direction
Implementation Method 2
the heat dissipation from the band-like sound absorbing member can be promoted
Data Source
AI summary
Provided is a pneumatic tire, which includes a tread portion having an annular shape and extending in a tire circumferential direction, a pair of sidewall portions disposed on both sides of the tread portion, a pair of bead portions disposed on inner sides of the pair of sidewall portions in a tire radial direction, and a band-like sound absorbing member bonded to an inner surface of the tread portion along the tire circumferential direction. The band-like sound absorbing member includes a plurality of cuts in an outer circumferential surface of the band-like sound absorbing member. At least one end of each of the cuts terminates within the band-like sound absorbing member.