Patent ID: 6612354
Filing Date: 2003-09-02
Classification: B60C,D07B,Y10S,Y10T

Abstract:
A pneumatic tire comprising:a belt disposed radially outside a carcass in a tread portion, said belt being being made of belt cords, each said belt cord being made up of 6-10 metallic filaments whose diameter is in a range of from 0.25-0.45 mm, said 6-10 metallic filaments being grouped into a plurality of elements, said plurality of elements being (i) bunches of 2 or 3 or 4 filaments, or (ii) 1 filament and bunches of 2 or 3 or 4 filaments, wherein each of the bunches includes at least one waved filament and at least one unwaved filament, and the bunches comprising a bunch including plural kinds of waved filaments having different wave pitches, the waved filament being two-dimensionally waved at a wave pitch and a wave height before twisted, wherein the wave pitch is in a range of from 5.0 to 30.0 times the diameter of the filament, and the wave height is in a range of from 0.2 to 3.0 times the diameter of the filament, said plurality of elements being twisted together into the cord at a twist pich of from 10-40 mm so that the two-dimensionally waved filaments are each subjected to a certain rotation around its axis.