| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a pneumatic tire that can achieve weight reduction without degrading durability and productivity. <P>SOLUTION: The pneumatic tire includes: a bead; a sidewall; a tread; a carcass reinforcing them; and a belt having at least two layers of cross belt layers on the outside of a crown part of the carcass in the tire radial direction. At least one layer of reinforcing member of the cross belt layer is steel cords 10 comprised of a core formed by disposing two core filaments 11 in parallel without being twisted and six sheath filaments 12 twisted around the core. If a core filament diameter is dc and sheath filament diameter is ds, an average sheath filament interval D expressed by the following formula is 25 to 80 μm and an interval between adjacent ones of steel cords 10 is 0.50-1.40 mm: D=[L-6 dsä1+(L/p)<SP POS="POST">2</SP>}<SP POS="POST">1/2</SP>]/6, where L=(π+2)dc+πds. <P>COPYRIGHT: (C)2012,JPO&INPIT |
