Heavy duty pneumatic radial tire with improved steel cord belt

Details Heavy duty pneumatic radial tire with improved steel cord belt Heavy duty pneumatic radial tire with improved steel cord belt

1989-11-01

1991-06-18

Ball, Michael W.

Resilient tires and wheels

Tires, resilient

Pneumatic tire or inner tube

152451, 57902, B60C 918, B60C 920, B60C 900

Patent

active

050242610

ABSTRACT:
A heavy duty pneumatic radial tire including between a tread and at least one carcass layer, at least two belt layers, wherein an outermost belt layer disposed most closely to the tread out of all belt layers comprises a steel cord which has a cord structure of 2+7 made of an element wire having a carbon content of 0.77 to 0.92% by weight and a diameter d of 0.28 to 0.40 mm and which has a tenacity at break of (1700.about.2050)d.sup.1.872 (kgf/cord) and a ratio of an elongation at break .epsilon. to P.L.E., .epsilon./P.L.E., of at least 30, and a coat rubber having a 50% modulus of 10 to 40 kg/cm.sup.2, and wherein the outermost belt layer has a thickness of at least 1.67 times the minor diameter but at greatest 1.79 times the major diameter, of the steel cord.

REFERENCES:
patent: 3996733 (1976-12-01), Holmes
patent: 4020887 (1977-05-01), Vlasov et al.
patent: 4349063 (1982-09-01), Kikuchi et al.
patent: 4518024 (1985-05-01), Matsunuma
patent: 4520857 (1985-06-01), Ogino et al.
patent: 4609024 (1986-09-01), Yatsunami et al.
patent: 4690191 (1987-09-01), Kawasaki
patent: 4715419 (1987-12-01), Kawasaki et al.
Mechanics of Pneumatic Tires, ed. Samuel Clark: U.S. Dept. of Transportation, Aug. 1981, p. 131.
Peene, G., "Dan Verhalten von Stahlcord unter Verschiedenen Beanspruchungen." Kautschuk und Gummi Kunststoffe, vol. 26, No. 7 (Jul. 1973), pp. 311-317.

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