Innovations in Tire Bead Design for Enhanced Performance

Heavy-duty tire design and manufacturing to improve bead durability without increasing rolling resistance. The tire has a unique carcass contour and molding process. The carcass contour has an outwardly bulging curved portion connected to an inwardly recessed inversely curved portion. This shape is represented by two tangent arcs. The ratio of distances from the tire equator and bead base to the arcs' inflection point falls within specific ranges. The molding process uses a clip width slightly larger than the rim width to apply pressure evenly during vulcanization.

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Pneumatic tire design that reduces rolling resistance and improves fuel efficiency without sacrificing durability. The tire has a bead-reinforcing layer outside the carcass that reinforces the bead portion. The tire also has specific geometric and material properties like loss tangent, complex elastic modulus, groove ratios, and sidewall characteristics.

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Pneumatic tire design with improved bead durability and ride comfort. It has a reinforcing rubber portion next to the turnup section of the carcass ply, between the bead and sidewall. This reinforcing rubber portion has a radially outer end that extends beyond the radially outer end of the inner rubber layer. It also has a thicker first portion where the inner and outer rubber layers are laminated, versus a thinner second portion where they are not. The outer rubber layer has a higher loss tangent and complex elastic modulus than the inner layer.

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Pneumatic tire design to reduce rolling resistance while maintaining tire rigidity for steering stability. The tire has a pair of bead apexes where the main body of the apex tilts at a specific angle (θc) relative to the tire axis. The apex tilting angle affects rolling resistance and torsional stiffness. The apex is tilted outward from the tire center. This imparts higher rolling resistance compared to a non-tilted apex. The angled apex increases in-plane torsional stiffness.

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A pneumatic tire design that reduces slippage between the tire bead and rim flange during high-performance driving while also preventing damage to the tire bead when mounting on a rim. The tire has a specific sidewall rubber compound and structure. The sidewall rubber has a complex elastic modulus ratio in a certain range. The sidewall also has an outer region that is softer than an inner region. This combination allows for controlled deformation of the outer sidewall during extreme driving conditions, reducing bead slippage. But the stiffer inner sidewall region prevents bead damage when mounting on a rim.

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A pneumatic tire design with improved flat spot resistance and high-speed durability. The tire has an optimized belt layer construction and bead design. It features a band layer with separate inner radial bands in each tread land. The inner radial bands have edges set back from the nearest groove to reduce strain. This reduces flat spots from band deformation when parked. The tire also has a shorter outer bead apex height to limit sidewall deformation. The optimized belt and bead design balance flat spot resistance with high-speed durability.

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A heavy-duty tire has improved bead durability to prevent inner carcass cord damage. The tire has bead cores with an angled inner surface that matches the rim seat angle when mounted. This reduces cord rubbing. The bead also has an apex rubber that tapers outward from the core with a softer inner portion. This provides cushioning to further reduce rubbing.

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Pneumatic tire with improved rolling resistance and lateral stiffness by using two different rubber compounds in the bead rim strip. The tire has a first rubber compound along the carcass turn-up that connects to a second rubber compound that contacts the rim. The compounds have different rebounds and hardness to provide a balance of performance. The first compound improves rolling resistance while the second compound enhances lateral stiffness.

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A pneumatic tire with improved puncture resistance and durability, particularly in the sidewall area. The tire has two carcass reinforcing plies. The first ply extends radially between the bead portions. The second ply wraps around the bead and apex forming a turn-up portion. This configuration provides increased strength and puncture resistance in the sidewall compared to a single ply. The two plies work together to distribute loads and prevent cuts and penetration.

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Pneumatic tire design for improved durability and endurance. It involves using different rubber compositions in the upper and lower bead fillers and a pad between the upper bead filler and sidewall. The upper bead filler has a rubber composition with higher sulfur content than the lower bead filler. The pad has an intermediate sulfur content. This combination of sulfur levels in the bead components and pad provides optimized durability.

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Bead design for heavy-duty truck tires to improve endurance and prevent carcass damage. The bead features a contention armature that overlaps itself on the outer side of the bead core rod. This overlapping armature provides additional reinforcement and prevents relative movement between the bead core and rubber components, reducing stress on the carcass and increasing bead endurance.

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A tire design that prevents dirt from getting trapped when the tire is mounted on a rim. The tire has special vent lines, protrusions, and saw cuts on the bead that project from the outer surface. The features create channels for dirt to escape and avoid getting trapped between the bead and rim. The tire mold has matching grooves to form these features during molding.

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A pneumatic tire design that improves bead durability specifically for tires with an outer apex structure. It involves adding reinforcing rubber layers adjacent to the carcass turn-up portions in the bead area. The innermost rubber layer has a lower loss tangent (tan δ) than the outer layer. These differential damping properties help reduce fatigue and separation in the bead area.

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A heavy-duty tire that can be successfully retreaded after its first lifecycle to reduce waste and cost. The tire has specific design parameters to prevent bead lifting that can occur when retreading. The bead contour, cover layer arrangement, and dimensions are optimized to ensure the bead stays properly seated on the rim. This involves maintaining specific distances between the bead core, carcass cords, and rim cushion rubber, as well as using organic fiber-reinforced layers and a certain thickness in the cover.

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Car tire design with improved durability and ride performance by optimizing the pad rubber layer between the sidewall and chafer. The tire has a pad rubber layer between the sidewall rubber and carcass ply adjacent to the chafer layer's rolled-up end. The padded rubber has a higher modulus than the sidewall rubber and contains a constant thickness section that is 7-26% of the tire's cross-section height. This disperses distortion around the bead over a range to reduce concentration at the chafer end.

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A heavy vehicle tire design to improve bead endurance and prevent cracking that occurs due to bending stresses in the bead when mounted on a rim. The tire utilizes a cushion rubber layer between the carcass layer and bead reinforcing layer elastomers. The cushion rubber has a lower modulus elastomer than the carcass and bead elastomers. This prevents cracks in the carcass elastomer from propagating to the bead reinforcement. The cushion rubber also reduces shear stresses on the carcass elastomer.

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A heavy-duty tire with improved resistance to curb impacts. The tire has a radial carcass reinforcement with a single layer of cords turned up around the tire bead. At least one layer of reinforcing cords provides additional stiffness at the turn-up. The cords are turned up around the bead wire to prevent damage from contact with the rim.

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A pneumatic tire for electric vehicles with improved rolling resistance, durability, and driving performance compared to conventional tires. The tire has a steel carcass ply that is not turned up through the bead portion like conventional tire plies. Instead, the steel ply extends straight through the bead. This eliminates the stress concentrations and delamination issues of turned-up plies. The straight ply improves rolling resistance, durability, and driving performance.

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A tire that provides improved grip, handling, and durability for high-performance applications like racing. The tire has a unique architecture and construction method that includes a continuous reinforcing filament wrapped in multiple layers around the bead. This improves bead durability and prevents cracking under extreme stresses. Additional features like angled carcass plies and low-angle crown reinforcement also enhance performance.

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A pneumatic tire with reduced weight and improved durability by optimizing the bead area construction. The tire has bead cores, a carcass layer, and a rim cushion rubber. The bead cores are wound bead wires surrounded by the carcass layer turned back over them, and the rim cushion rubber covers the turned-back carcass layer. The turned-back carcass layer forms a closed region around the bead cores. The tire reduces weight and material use by minimizing rubber occupancy in the closed region while maintaining durability with a specific wire arrangement and contact height ratio.

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