Pneumatic Tire Inner Structure for Puncture Repair Liquid Flow
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Solution Overview
Problem
Puncture repair in tires with sound absorptive members installed on the inner surface is hindered by the blocking of puncture repair liquid flow due to the sound absorptive member and its fixing means, making it difficult to reach the failure site effectively.
Innovation Solution
A pneumatic tire design featuring a sound absorptive member installed on the inner surface with a sheet material interposed between it and the tire, utilizing first and second fixed regions and a non-fixed region to maintain flexibility and prevent adhesion, along with a repair liquid introducing portion to ensure unobstructed flow of puncture repair liquid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a sound absorptive member is installed on the tire inner surface to reduce tire noise, then tire noise reduction is improved, but the flow of puncture repair liquid is blocked making repair difficult
Solution Approach 1:
The sound absorptive member is divided into multiple sections along the tire circumferential direction, with gaps between sections. This segmentation allows puncture repair liquid to flow through the gaps and reach puncture sites while the member remains installed for noise reduction
Solution Approach 2:
Certain sections of the sound absorptive member are removed to create through-going gaps that provide unobstructed pathways for puncture repair liquid injection, ensuring that repair access is maintained despite the presence of the sound absorptive member in other areas
2Reliability
If the sound absorptive member is fully adhered to the tire inner surface to ensure stability, then fixation reliability is improved, but the flexibility needed for puncture repair access is lost
Solution Approach 1:
The adhesive application is segmented rather than continuous, with adhesive applied only at specific positions to create fixed regions separated by non-fixed regions. This allows the sound absorptive member to be securely fixed while maintaining flexibility in intermediate sections for repair access
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
Enables reliable puncture repair by preventing the sound absorptive member from blocking the puncture repair liquid flow, allowing the liquid to reach the failure site efficiently and effectively, while maintaining the durability and workability of the tire.
Implementation Method 1
a sound absorptive member formed of a porous material, such as a sponge, is bonded to an inner surface of a tread portion
Data Source
AI summary
In a pneumatic tire, a sound absorptive member is installed on an inner surface of a tread portion with a sheet material interposed therebetween. The sheet material is fixed relative to the tire inner surface or the sound absorptive member at first fixed regions. The sheet material is not fixed relative to the tire inner surface or the sound absorptive member at a non-fixed region between the first fixed regions. The sheet material is fixed at a second fixed region relative to the other of the tire inner surface or the sound absorptive member ina portion of the non-fixed region. A repair liquid introducing portion connects a closed space and a tire cavity with the sheet material, the closed space being separated from the tire cavity by the tire inner surface and the non-fixed region or the sound absorptive member and the non-fixed region in a meridian cross-section.