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US 5,759,314 AGranted
Bias tire having crown reinforcement between carcasses and method of making same
AssigneeMichelin Recherche et Technique S.A.
InventorAlex Southarewsky
Life of this patent
Estimating the term…
Abstract
A bias tire includes a reinforcement member disposed between a first carcass and an additional carcass in the crown region of the tire for restricting the circumferential growth of the tire. The reinforcement member includes a plurality of cords oriented at zero degrees. The total circumferential strength of the reinforcement member is about 20 to 250% of the circumferential strength of the carcass plies. The reinforcement member, first carcass, and additional carcass are formed on a tire building drum as a green tire component in a method of making the tire.
Claims10
A bias ply tire comprising:
- at least one pair of bead members;
- a pair of sidewall portions each being disposed on a respective side of a mid circumferential plane of the tire and having a bead member disposed therein;
- a first carcass having at least one bias ply of cords all disposed at the same bias angle relative to the mid-circumferential plane;
- at least one additional carcass, each additional carcass having at least one bias ply of cords all disposed at the same bias angle relative to the mid-circumferential plane, at least the first carcass being anchored to a bead member in one respective sidewall portion and a bead member in the other sidewall portion and each carcass having a lateral extent extending transversely of the mid circumferential plane on both sides thereof with the lateral extent of each additional carcass being radially outward of the lateral extent of the first carcass;
- a tread portion radially outward of the lateral extents of the first and additional carcasses, the tread portion being connected through shoulder portions with the pair of sidewall portions;
- and
- a circumferentially extending reinforcement member disposed radially intermediate the lateral extents of the first and additional carcasses, the reinforcement member including at least one non-metallic cord extending substantially parallel to the mid circumferential plane of the tire wherein the bias plies of the first and additional carcasses have a total circumferential strength as measured parallel to the mid circumferential plane of the tire defined by
- ST.sub.total =ST.sub.1 + . . . ST.sub.n
- with the individual circumferential strength of each carcass defined by
- ST.sub.1 . . . n =.SIGMA.e.sub.i t.sub.i cos alpha.sub.i
- where .SIGMA.e.sub.i is the number of cords i.sub.1 . . . i.sub.n per unit width of each carcass, t.sub.i is the tensile strength of a cord i, and alpha.sub.i is the uniform bias angle of a cord i relative to the mid circumferential plane;
- the reinforcement member has a circumferential strength defined by
- SB=e.sub.rm t.sub.rm
- where e.sub.rm is the number of cords per unit width of the reinforcement member and t.sub.rm is the cord tensile strength of the reinforcement member;
- and the reinforcement member circumferential strength is between approximately 20 to 250% of the total circumferential strength of the first and additional carcasses.
12 more elements
A bias ply tire comprising:
- at least one pair of bead members;
- a pair of sidewall portions each being disposed on a respective side of a mid circumferential plane of the tire and having a bead member disposed therein;
- a first carcass having at least one bias ply of cords all disposed at the same bias angle relative to the mid-circumferential plane;
- at least one additional carcass, each additional carcass having at least one bias ply of cords all disposed at the same bias angle relative to the mid-circumferential plane, at least the first carcass being anchored to a bead member in one respective sidewall portion and a bead member in the other sidewall portion and each carcass having a lateral extent extending transversely of the mid circumferential plane on both sides thereof with the lateral extent of each additional carcass being radially outward of the lateral extent of the first carcass;
- a tread portion radially outward of the lateral extents of the first and additional carcasses, the tread portion being connected through shoulder portions with the pair of sidewall portions;
- and
- a circumferentially extending reinforcement member disposed radially intermediate the lateral extents of the first and additional carcasses, the reinforcement member including at least one non-metallic cord extending substantially parallel to the mid circumferential plane of the tire wherein the bias plies of the first and additional carcasses have a total circumferential strength as measured parallel to the mid circumferential plane of the tire defined by
- ST.sub.total =ST.sub.1 + . . . ST.sub.n
- with the individual circumferential strength of each carcass defined by
- ST.sub.1. . . n =.SIGMA.e.sub.i t.sub.i cos alpha.sub.i
- where .SIGMA.e.sub.i is the number of cords i.sub.1 . . . i.sub.n per unit width of each carcass, t.sub.i is the tensile strength of a cord i, and alpha.sub.i is the uniform bias angle of a cord i relative to the mid circumferential plane;
- the reinforcement member has a circumferential strength defined by
- SB=e.sub.rm t.sub.rm
- where e.sub.rm is the number of cords per unit width of the reinforcement member and t.sub.rm is the cord tensile strength of the reinforcement member;
- and the reinforcement member circumferential strength is between approximately 20 to 150% of the total circumferential strength of the first and additional carcasses.
12 more elements
Dependencies are inferred from the claim text.