| 摘要 |
The tire has inextensible-wire, crossed-reinforcement crown plies (31, 32) at angles alpha , alpha ' between 10 deg and 45 deg , their axial widths L31 and L32 in the ranges 0.65 So - 0.80 So and 0.35 So - 0.45 So, So being the mean maximum axial width of carcass reinforcement. Crown reinforcement is completed by two or more wired half-layers (33), angled with the equator by beta , less than the smaller of angles alpha and alpha '. They continue the crown ply and are disposed on both sides of the equatorial plane (XX') with axial widths between 0.22 So and 0.35 So, such that their axially-internal ends are spaced from the equatorial plane by the half width of the narrowest ply (32), less 0.05 So or more. Preferred features: The plies (31, 32) are radially closest to the carcass (1) reinforcement. The narrower (32) is closest to the radially outer ply of the carcass reinforcement. The ply of lesser width (32), has reinforcements oriented at alpha '. Crown reinforcement (3) is completed, radially-outside the two half plies (33), by two half plies (34) with inextensible wires. These are mutually parallel in each half ply (34) and cross the two radially-lower half plies (33) making angle psi with the circumferential direction, exceeding the greater of alpha and alpha ' of the axially-continued plies. It also exceeds angle beta of the two first half ply (33) reinforcing wires, by at least 10 deg . Internal axial ends of the half plies with wires orientated at psi , are spaced from the equator by the half width L31 of the crown ply axially continued to the widest (31), reduced by 0.05 So or more. External axial ends of the half plies of wires at angle psi are spaced from the equator by at least the separation between the plane of the axially-outer ends of the half plies (33) from wires of angle beta . |
