Puncture Resistant Tire Interior Layer Design
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Solution Overview
Problem
Prior art pneumatic tires face challenges in maintaining puncture resistance due to the restraint of plastic film layers by rubber during lamination, limiting their effectiveness in retaining air and structural integrity.
Innovation Solution
A pneumatic tire design featuring a highly deformable puncture-resistant layer with a maximum percent elongation of up to 300% and a tack value of 5 N to 50 N with the carcass, positioned between the carcass and the air barrier layer, which allows for self-adhesion and protection of the air barrier layer from sharp objects, utilizing materials like thermoplastic films and butyl rubber compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plastic film layer is used as a puncture resistant structure, then puncture resistance is improved, but the film is restrained by the rubber during lamination making it difficult to function effectively
Solution Approach 1:
The puncture resistant plastic film layer is extracted from the traditional position within the rubber tread and relocated to the interior of the tire, positioning it between the carcass and the air barrier layer. This extraction eliminates the lamination difficulty between film and rubber while preserving the puncture resistance function.
Solution Approach 2:
The plastic film layer serves as an intermediary element between the carcass and the air barrier layer. By positioning it in this intermediate location, it fulfills its puncture resistance function without being constrained by rubber lamination, effectively mediating between structural integrity and air retention requirements.
2Reliability
If the puncture resistant layer is made highly deformable with up to 300% elongation, then puncture resistance and self-recovery are improved, but the structural rigidity may be reduced
Solution Approach 1:
The tire structure employs different material properties in different locations: the puncture resistant layer has high deformability (up to 300% elongation) localized at the position where puncture protection is needed, while other structural components maintain their rigidity. This local differentiation allows the deformable layer to absorb puncture impacts without compromising the overall structural integrity of the tire.
Solution Approach 2:
The tire utilizes a composite structure combining the deformable puncture resistant plastic film layer with the rigid carcass and air barrier layer. This composite arrangement allows each layer to perform its specific function - the deformable puncture resistant layer absorbs impacts while the composite structure as a whole maintains structural rigidity and shape.
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 tire maintains air integrity and structural integrity by preventing punctures from sharp objects, allowing the tire to self-recover and maintain functionality with minimal impact on tire lifetime, offering enhanced puncture resistance and deformability.
Implementation Method 1
The puncture resistant layer has a maximum percent elongation of up to 300%
Implementation Method 2
a tack value with the carcass of 5 N to 50 N at normal inflation pressure
Data Source
Figure 1A
Figure 1B
Figure 2A~2B
AI summary
A pneumatic tire (10) is disclosed comprising a carcass (16), an air barrier layer (24) and a puncture resistant layer (20, 20b). In one aspect, the puncture resistant layer (20, 20b) is located adjacent to the carcass (16) and the puncture resistant layer (20, 20b) has a post cure tack value with the carcass (16) of less than 50 N as measured at normal inflation pressure in accordance with ASTM D624-00 - Type C configuration. In another aspect, the puncture resistant layer (20, 20b) is located adjacent to the air barrier layer (24) and the puncture resistant layer (20, 20b) has a post cure tack value with the air barrier layer (24) of less than 50 N as measured at normal inflation pressure in accordance with ASTM D624-00 - Type C configuration.