| US 7,513,281 B2 | ||
| Method of manufacturing pneumatic tire | ||
| Ikuji Ikeda, Kobe (Japan); Yoshikazu Tanaka, Kobe (Japan); and Naohiko Kikuchi, Kobe (Japan) | ||
| Assigned to Sumitomo Rubber Industries, Ltd., Kobe-shi (Japan) | ||
| Filed on Feb. 23, 2005, as Appl. No. 11/62,443. | ||
| Application 11/062443 is a division of application No. 09/984379, filed on Oct. 30, 2001, granted, now 7,060,146. | ||
| Claims priority of application No. 2000-330854 (JP), filed on Oct. 30, 2000; and application No. 2000-361453 (JP), filed on Nov. 28, 2000. | ||
| Prior Publication US 2005/0145314 A1, Jul. 07, 2005 | ||
| Int. Cl. B60C 13/00 (2006.01) | ||
| U.S. Cl. 152—458 [152/525] | 7 Claims |
| 1. A pneumatic tire comprising:
a tread portion;
a pair of sidewall portions;
a pair of bead portions;
a carcass extending between the bead portions through the tread portion and sidewall portions; and
a sidewall rubber disposed axially outside the carcass in each of the sidewall portions, the sidewall rubber formed by winding
a tape made of rubber with short fibers therein, wherein
the short fibers in the tape are oriented towards the longitudinal direction of the tape,
the sidewall rubber comprises a highly oriented part formed by winding the tape having a smaller thickness t1 and a less oriented part part formed by winding the tape having a larger thickness t2, and
a ratio (t1/t2) of the smaller thickness t1 to the larger thickness t2 is in a range of from 0.15 to 0.80, wherein
the short fibers in the highly oriented part formed by winding the thinner tape are highly oriented in the tire circumferential
direction in comparison with the short fibers in the less oriented part formed by winding the thicker tape, and
the less oriented part is formed in a mid range of the tire section height, and the highly oriented part is formed on the
radially outside and inside of the less oriented part.
|