| 摘要 |
The run-flat pneumatic tire (P) has an inner tire carcass (M) inflated at a higher pressure than the main tire. The inner carcass (M) has a band of reinforcement cords (120) which, seen on a center section, is wrapped round each of the lower tire ring rim reinforcement (2) sections. The inner dia. (DR) of the tire is equal to the nominal dia. (DS), and has a lateral dimension to allow for a rupture after a collapse of the tire tread hoop and for the expansion of the higher pressure within the inner carcass. The reinforcement cords (120) are not rigidly bonded to the tire rim wire, and have a mean length within the inner tire flanks (11) to keep the outer and inner carcasses apart over a radial height between a dia. of DS and DS+2(DR-DS). The rupture force on the tire wire (2), with the wound reinforcement cords (120), is 1.2-4.0 times the rupture force per cm at the tire tread hoop at the inner carcass (M). The flank (11) reinforcement cords (120) are radial filaments or cables, at an angle of 50-90 deg to the peripheral direction. The tread (12) of the inner tire, and the flank (11) reinforcement cords (120) are structured so that one end of the tread is at a shoulder of the inner tire and the other end is round the twist round the tire wire (2) opposite the first shoulder. A second set of reinforcement cords (120) runs from the first shoulder to the tire wire on that side, opposite the other tire wire. The pressure within the inner tire carcass (M), when cold such as at 20 deg C, is higher than the remaining tire pressure by 0.5/*10<5> Pa to 5.0/*10<5> Pa. |
