| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a pneumatic tire that achieves weight saving while enhancing driving stability, durability and productivity. <P>SOLUTION: In the pneumatic tire, a belt includes at least one circumferential belt layer and at least one inclined belt layer. A steel cord 10 of the inclined belt layer comprises a core that has two core filaments 11 disposed in parallel without being twisted together, and six sheath filaments 12 that are twisted together around the core. An average distance D between the sheath filaments 12, which is in the range of 25-80 μm, is expressed by the following formula: D=[L-6dsä1+(L/p)<SP POS="POST">2</SP>}<SP POS="POST">1/2</SP>]/6 (where L=(π+2)dc+πds). In the formula, dc represents a diameter of the core filament 11; ds represents a diameter of the sheath filament 12; and p (mm) represents a twist pitch of the sheath filament 12. <P>COPYRIGHT: (C)2012,JPO&INPIT |
