Resilient tires and wheels – Tires – resilient – Pneumatic tire or inner tube
Patent
1985-12-18
1987-09-01
Czaja, Donald E.
Resilient tires and wheels
Tires, resilient
Pneumatic tire or inner tube
57902, 152451, B60C 918
Patent
active
046901914
ABSTRACT:
A radial tire has a combined reinforcement consisting of a belt composed of at least three piled cord layers with steel cords buried in parallel in rubber in which the cords in each of the layers are set at a relatively small angle with respect to a tire equatorial plane and the cords in at least one pair of the adjacent cord layers are intersectingly arranged at an angle from 15.degree. to 30.degree. and a carcass having cords arranged substantially at right angles with respect to the tire equatorial plane. The steel cords buried in the at least one pair of the cord-intersecting cord layers other than the outermost cord layer have Young's modulus of 6,000 to 16,000 kg/mm.sup.2 and a flexural rigidity of 150 to 250 g, and the initial stage elongation (P.L.E.) of the rubberized cords taken out from the tire is not more than 0.2%. A tire reinforcing steel cord of a two layer twisted construction is also disclosed, which cord is composed of a core consisting of from two to four steel filaments and a single sheath consisting of a plurality of the steel filaments surrounding the core in which the steel filaments have a tensile strength of not lower than 260 kg/mm.sup.2 and a filament diameter of from 0.32 to 0.42 mm; the twisting direction of the core is reversed to that of the sheath; the twisting angle of the sheath, P2, is 72.degree..ltoreq.P2.ltoreq.80.degree. and the core twisting angle (P1) and the sheath twisting angle P2 meet the relation of 1.0.ltoreq.P1/P2.ltoreq.1.1.
REFERENCES:
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patent: 4158946 (1979-06-01), Bourgois
patent: 4161203 (1979-07-01), Suzuki et al.
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patent: 4481996 (1984-11-01), DeBondt et al.
patent: 4488587 (1984-12-01), Umezawa et al.
patent: 4572264 (1986-02-01), Umezawa et al.
patent: 4606392 (1986-08-01), Weidenhaupt et al.
Research Disclosure, #18441, disclosed anonymously, Aug. 1979, pp. 430-431.
Bridgestone Corporation
Czaja Donald E.
Hoch Ramon R.
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