Pneumatic Tire Overlay Reinforcement for High Speed Performance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional radial carcass tires face challenges in achieving high speed performance, comfort, reduced flatspotting, and low noise propagation while maintaining cost-effectiveness, as they rely on costly 'by two' constructions and exhibit lower modulus, leading to suboptimal results.
Innovation Solution
The implementation of a nylon reinforced overlay structure with cords constructed as 2000-2900/1 Dtex and 1-10 TPI twist, extending transversely between -5 to 5 degrees with the equatorial plane, which provides a cost-efficient alternative to conventional 'by two' constructions, enhancing high speed performance and reducing flatspotting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional nylon overlay ply with low modulus (6,000 MPa) is used, then belt expansion during shaping and vulcanizing is allowed, but high speed performance and resistance to flatspotting are insufficient
Solution Approach 1:
The patent changes the material parameter by using polyester cord with a higher modulus (10,000-15,000 MPa) compared to conventional nylon (6,000 MPa). This parameter change allows the overlay ply to maintain dimensional stability at high speeds while still permitting controlled belt expansion during manufacturing, thus resolving the contradiction between adaptability and reliability.
2Reliability
If costly 'by two' constructions are used for overlay ply, then high speed performance may be improved, but manufacturing cost increases
Solution Approach 1:
The patent employs a cost-effective polyester cord construction that achieves high speed performance without requiring expensive 'by two' constructions. The single-ply overlay made from high-modulus polyester provides the necessary performance at a lower manufacturing cost, effectively replacing costly conventional solutions.
3Ease of manufacture
If overlay ply with low modulus is used, then manufacturing is easier, but flatspotting increases
Solution Approach 1:
The patent changes the modulus parameter of the overlay ply material from low (conventional nylon 6,000 MPa) to high (polyester 10,000-15,000 MPa). This higher modulus provides resistance to flatspotting while the helical winding configuration and polyester's inherent properties maintain ease of manufacture, resolving the contradiction between manufacturing ease and harmful effects.
Data Source
Figure 1
AI summary
A pneumatic tire comprises a carcass (12), a tread (19) disposed radially outward of the carcass (12) and a crown reinforcing structure (14) interposed between the tread (19) and the carcass (12) in circumferential relation to the carcass (12). The crown reinforcing structure (14) includes a belt assembly having at least one belt ply (15, 16) with reinforcement cords extending parallel to one another and an overlay structure (18) including an aliphatic polyamide reinforced layer. The aliphatic polyamide reinforced layer makes an angle of between -5 degrees and +5 degrees with an equatorial plane (EP) of the tire (10), the aliphatic polyamide reinforced layer including aliphatic polyamide cords having a 1900/1 to 3000/1 Dtex, 1 to 10 turns per 2.54 cm cord construction.