Claims
- 1. A pneumatic automobile tire comprising a tread portion extending in a circumferential direction and at least two superimposed rubber belt layers extending circumferentially adjacent to and beneath said tread portion, each belt layer comprising a row of a plurality of steel cords embedded in a coating rubber, each steel cord having a diameter d in mm and consisting of two intertwisted steel filaments each of which contains 0.80-0.92 weight percent of carbon, said rows of steel cords in adjoining belt layers being spaced apart from each other a distance t of from 0.6 to 0.9 mm and said coat rubber having a 100% elastic modulus of 35 to 55 kg/cm.sup.2, the mean cross-sectional area Sa of the cords in 1 mm unit of cross-sectional width of a belt layer being from 0.10 to 0.15 mm.sup.2 and the mean cross-sectional area Sb of the coat rubber in 1 mm unit of cross-sectional width of a belt layer having a thickness equal to d+t being from 1.00 to 1.45 mm.sup.2.
- 2. The pneumatic automobile tire of claim 1, wherein said at least two superimposed rubber belt layers consist of two belt layers.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2-152647 |
Jun 1990 |
JPX |
|
Parent Case Info
This application is a continuation of application Ser. No. 08/376,309 filed Jan. 23, 1995, now abandoned, which is a continuation of application Ser. No. 08/101,290, filed Aug. 3, 1993, now abandoned, which is a continuation of Ser. No. 07/707,760, filed May 30, 1991, now abandoned.
US Referenced Citations (6)
Foreign Referenced Citations (4)
Number |
Date |
Country |
4119249 |
Dec 1991 |
DEX |
6218303 |
Jan 1987 |
JPX |
62-117893 |
May 1987 |
JPX |
390402 |
Apr 1991 |
JPX |
Non-Patent Literature Citations (1)
Entry |
Mechanics of Pneumatic Tires, ed. Samuel Clark, US Dept. of Transportation, Aug. 1981, p. 881. |
Continuations (3)
|
Number |
Date |
Country |
Parent |
376309 |
Jan 1995 |
|
Parent |
101290 |
Aug 1993 |
|
Parent |
707760 |
May 1991 |
|