Tyre Carcass Joint Layout for High-Speed Uniformity
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Solution Overview
Problem
Traditional tire manufacturing processes result in appearance defects and uniformity issues at high speeds due to the high density of wire carcass reinforcement elements in the junction area, leading to localized density variations.
Innovation Solution
A method of manufacturing tires that involves forming a carcass assembly and a working assembly around a cylindrical support, where the carcass assembly is deformed to reduce the circumferential forces on the junction, allowing for a single working layer and optimizing the angle of wire reinforcement elements to minimize junction formation or spacing, thereby reducing the number of wire reinforcing elements needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a high density of wire carcass reinforcement elements is used in the junction area to ensure structural strength, then the strength of the tire is improved, but appearance defects and uniformity issues occur at high speeds
Solution Approach 1:
The patent applies local quality by varying the density of wire reinforcement elements across different regions of the tire. Specifically, the junction area has a reduced density of wire elements compared to traditional designs, while other critical areas maintain adequate reinforcement. This localized differentiation allows the tire to achieve uniform appearance and high-speed performance without compromising overall structural strength.
2Manufacturing precision
If the number of wire reinforcing elements in the junction is reduced to improve appearance and uniformity, then manufacturing precision is improved, but the strength may be compromised
Solution Approach 1:
The patent employs parameter changes by modifying the angular orientation of wire reinforcement elements in the junction area. The wires are positioned at specific angles relative to the circumferential direction of the tire, creating an optimized stress distribution pattern. This angular parameter adjustment allows reduced wire density while maintaining sufficient strength to handle operational loads.
3Strength
If traditional manufacturing processes are used with high wire density in junctions, then structural integrity is maintained, but rolling resistance increases due to energy dissipation
Solution Approach 1:
The patent reduces energy dissipation and rolling resistance by implementing local quality variations in the junction area. The reduced density of wire reinforcement elements in this specific region decreases material hysteresis and internal friction during tire deformation cycles. This localized optimization allows the tire to maintain structural integrity in critical areas while minimizing energy losses in the junction region.
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
This approach enhances the appearance and uniformity of the tire at high speeds by reducing the density of wire reinforcing elements in the junction area, minimizing defects, and lowering rolling resistance through reduced energy dissipation.
Implementation Method 1
the assembly, which is substantially cylindrical in shape, is deformed to obtain a substantially toroidal shape
Data Source
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AI summary
The invention concerns a method for manufacturing a tyre comprising a carcass reinforcement comprising a carcass layer and a working reinforcement comprising a single working layer. The method involves forming, around a support, a wound carcass assembly (52) intended to form the carcass layer and a wound working assembly intended to form the working layer, then deforming the support. The wound carcass assembly (52) is formed in such a way as to form either a butt joint (56) without forming an overlap, or a lap joint (56), or without forming a joint.