B - Operations – Transporting – 60 – C
Patent
B - Operations, Transporting
60
C
152/90
B60C 9/20 (2006.01) B60C 9/00 (2006.01) D07B 1/06 (2006.01)
Patent
CA 1218590
Abstract of the Disclosure A large-size pneumatic radial tire for use on rough road is disclosed, which comprises as a tire reinforcement a carcass ply of cords arranged in a direction substantially perpendicular to the equatorial plane of the tire and a belt composed of at least three cord layers each containing steel cords embedded parallel to each other in rubber and arranged at a relatively small angle with respect to the equatorial plane of the tire, at least a pair of adjacent cord layers among which being piled one upon the other to cross their cords with each other at an angle of 15-30° with respect to the equatorial plane. In this type of the tire, the outermost cord layer for the belt is a cord layer formed by embedding a plurality of twisted steel cords, each having a single layer construction of 1x3, 1x4 or 1x5 or a double layer construction with a core of 1 to 2 filaments obtained by twisting plural steel filaments shaped prior to the formation of cord, in rubber at a cord volume fraction of 5-40% so as to provide a sealing type penetration form wherein a portion of the cord having an inner space completely filled with the penetrated rubber and a length ?1 is alternately connected with a portion of the cord having an inner - 31 - space incompletely filled with the penetrated rubber and a length ?2 in the longitudinal direction of the cord so as to satisfy ?2 of not more than 10 mm and ?1/?2 of not less than 0.14. - 32 -
468429
Kawasaki Kiyohito
Koseki Hiroyuki
Matsunuma Tamotsu
Sato Michitaka
Bridgestone Corporation
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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