Claims
- 1. A heavy duty pneumatic radial tire including between a tread and at least one carcass layer comprising carcass cords arranged substantially perpendicular to the circumferential direction of the tire, at least two belt layers comprising steel cords including a least a pair of belt layers disposed adjacent to each other with steel cords in one layer crossing those in the other layer, 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 an elongation characteristic having a ratio of an elongation at break .epsilon. to an initial stage elongated, .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 said 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 said steel cord.
- 2. A tire as claimed in claim 1, wherein an inner element wire of said steel cord has a twist pitch of 5 to 10 mm and an outer element wire has a twist pitch of 10 to 20 mm.
- 3. A tire as claimed in claim 2, wherein said steel cord has a ratio of its major diameter to its minor diameter within a range of 1.1 to 1.4.
- 4. A tire as claimed in claim 1, wherein said steel cord comprises an element wire plated with at least one member selected from the group consisting of Cu, Sn and Zn and alloys of two or more thereof, with or without containing Ni or Co.
Priority Claims (1)
Number |
Date |
Country |
Kind |
61-278805 |
Nov 1986 |
JPX |
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Parent Case Info
This application is a continuation-in-part application of application Ser. No. 124,204, filed Nov. 23, 1987.
US Referenced Citations (8)
Foreign Referenced Citations (2)
Number |
Date |
Country |
3442799 |
Jun 1985 |
DEX |
2039580 |
Aug 1980 |
GBX |
Non-Patent Literature Citations (2)
Entry |
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. |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
124204 |
Nov 1987 |
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