Tire construction utilizing low-twist body ply yarn with low...

Details Tire construction utilizing low-twist body ply yarn with low... Tire construction utilizing low-twist body ply yarn with low...

B - Operations, Transporting

60

C

152/96, 152/85.2

B60C 15/06 (2006.01) B60C 9/08 (2006.01) B60C 15/00 (2006.01)

Patent

CA 1241259

-20- ABSTRACT OF THE DISCLOSURE A pneumatic radial ply tire in which the body ply is formed of a low twist yarn having be- tween three and six turns-per-inch. The body ply terminates in relatively low turn-up ends extending along the side walls a distance between 10% and 30% of the tire section height and out of the area of cyclic stress and oscillation in the side walls of the tire. A relatively high, wide and hard bead filler is located within a bead portion of the tire and has a height between 20% and 50% of the tire section height with a width of between 15% and 35% of the bead filler height. The bead filler has a hardness of between 75 and 98 on the Shore A scale. The ply yarn preferably is polyester and the indi- vidual low twist strands are arranged in a parallel relationship and is preferably free of transverse cross strands known as wefts or picks. The combina- tion of low twist yarn, low turn-up body ply ends and bead filler size and hardness provides a tire having increased durability and uniformity at a lower cost.

489578

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