Patent ID: 9132700
Filing Date: 2015-09-15
Classification: B60C,Y10T

Abstract:
1. A pneumatic tire comprising: a pair of bead portions each including a bead toe that is an inner end portion of the bead portion in the tire radial direction, a bead core, and a bead filler adjoining the bead core, the bead filler enhancing a rigidity of the bead portion, a carcass layer laid between the pair of bead portions, the carcass layer being bent outward in the tread width direction so as to cover the bead core and the bead filler; a tread portion positioned on an outer side of the carcass layer in a tire radial direction; and at least two belt layers positioned between the carcass layer and the tread portion, wherein the at least two belt layers form an overlapping area where two of the at least two belt layers overlap one another, in a tread width direction cross section mounted to a standard rim under a standard internal pressure and no load condition, a ratio BW/CW between a length of the line segment BW and a length of the line segment CW is equal to or larger than 0.6 and equal to or smaller than 0.8, and an angle θ formed by the line segment BC and the line segment CW is equal to or larger than 50° and equal to or smaller than 70°; a radial direction difference CH is a radial direction difference between the point C and the point T, a radial direction difference SH is a radial direction difference between the point S and the point T, and the ratio CH/SH is equal to or smaller than 0.50; a radial direction difference BD is a radial direction difference between the point B and the point D in the tire radial direction, and the ratio BD/BW is equal to or larger than 0.02 and equal to or smaller than 0.1; a radial direction difference EF is a radial direction difference between the point E and the point F in the tire radial direction, and the ratio EF/BW is equal to or larger than 0.05 and equal to or smaller than 0.15; a radial direction difference UH is a radial direction difference between the point U and the point T, and the radial direction difference UH is equal to or smaller than 25 mm.