Pneumatic tire and method for making same
AssigneeThe Goodyear Tire & Rubber Company
InventorGrahame N. W. Smith
Life of this patent
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Abstract
An improved pneumatic tire and improved method for building same on a high crown building drum. The lower bead portion of the tire is provided with an additional reinforcing ply structure which is wrapped about a substantially inextensible bead wire. An improved method of building a tire on a high crown building drum wherein the additional reinforcing ply structure in the bead area is placed in tension during vulcanization.
Claims16
A large pneumatic tire having a ground-engaging tread portion, a pair of bead portions said bead portions each having a substantially inextensible bead core, a pair of sidewall portions, each of said sidewall portions extending from one of said lateral ends of said tread portions radially inward terminating at one of said bead portions, respectively, a carcass reinforcing structure extending circumferentially about said tire from one of said bead portions through said sidewall portions and said tread portion terminating in the other bead portion, said carcass structure having its lateral ends wrapped about each of said bead cores respectively, characterized by a second pair of reinforcing bead cores each being disposed axially outward of each of said respective bead cores, said carcass reinforcing structure and said lateral ends of said carcass structure, a second reinforcing structure is wrapped about each of said second reinforcing bead cores and extends radially outward with respect to the axis of rotation of said tire terminating prior to reaching the maximum section width of the tire, wherein said second reinforcing structure constitutes the exclusive reinforcement wrapped around each of said second reinforcing bead cores, an elastomeric spacer is disposed between said second reinforcing structure and said lateral ends of said carcass structure, said tire having a sufficient amount of elastomeric material adjacent said second reinforcing structure such that during vulcanization of said tire said second reinforcing structures are placed in tension.
A method of building a tire on a high crown building drum comprising the steps of:
- providing a carcass reinforcing structure about the circumference of said building drum;
- providing a pair of substantially inextensible bead cores radially about said structure and adhering thereto said bead cores in axially spaced apart position;
- forcing the lateral ends of said carcass reinforcing structure about said bead cores;
- providing a fabric reinforcing structure adjacent each bead core, said reinforcing structure comprising of at least one cord reinforcing strip;
- providing a second substantially inextensible reinforcing bead core about each of said fabric reinforcing structures;
- folding the lateral ends of said fabric reinforcing structure about said second substantially inextensible bead cores;
- providing an elastomeric sidewall structure about said reinforcing structure;
- shaping the tire assembly to a substantial toroidal configuration;
- providing an elastomeric tread structure circumferentially about the outer periphery of said tire;
- vulcanizing said tire to its final configuration, said tire having a sufficient amount of elastomeric material adjacent said reinforcing structures so that during vulcanization said elastomeric material flows radially outward thereby causing said cords of said reinforcement strips to be placed in tension.
A method of building a tire on a high crown building drum comprising the steps of:
- providing a carcass reinforcing structure about the circumference of said building drum;
- providing a pair of substantially inextensible bead cores radially about said structure and adhering thereto said bead cores in axially spaced apart position;
- folding the lateral ends of said reinforcing structure about said bead cores;
- providing a second preassembled reinforcing structure about each of said cores, said preassembled structure comprising at least one fabric strip folded about a second inextensible bead core;
- providing an elastomeric sidewall structure about said reinforcing structure;
- shaping the assembly to a substantially toroidal configuration;
- providing an elastomeric tread structure circumferentially about the outer periphery of said tire;
- vulcanizing said tire to its final configuration, said tire having a sufficient amount of elastomeric material adjacent said reinforcing structures so that during vulcanization said elastomeric material flows radially outward thereby causing said cords of said reinforcement strips to be placed in tension.
Dependencies are inferred from the claim text.