PNEUMATIC TIRE CASING BEAD Russian patent published in 1994 - IPC

FIELD: production of tires. SUBSTANCE: bead has three layers of inner group 1 of layers of carcass, which is wrapped around bead wing 3, and one layer of outer group 2 disposed at the outer side of bead. Bead tape 4 is disposed between twisted portion of the first layer of carcass and the fourth layer of carcass. Bead tape 5 is disposed at the outer side of the fourth layer of carcass. Bead is characterized in that modified ratio of bead tape width to first layer width, ratio of distance between carcass first layer edge and upper edge of bead tape, ratio of distance between edges of the first and second layers of carcass and second layer width are introduced. EFFECT: enhanced reliability in operation. 1 dwg, 1 tbl