PNEUMATIC TIRE

摘要

In an apex 34 of a tire 2, a reinforcing portion 48 is located inward of a main body 46 in an axial direction. When a position on an outer surface of the tire 2 at which position a height from a BBL is 14 mm is defined as a first point P1 and a position on the outer surface of the tire 2 at which position a height from the BBL is 20 mm is defined as a second point P2, the reinforcing portion 48 overlaps the first point P1 and the second point P2 in a radial direction. A loss tangent of the reinforcing portion 48 is equal to a loss tangent of the main body 46 or less than the loss tangent. A hardness of the reinforcing portion 48 is equal to a hardness of the main body 46 or greater than the hardness.

主权项

1. A pneumatic tire comprising a tread, a pair of sidewalls, a pair of clinches, a pair of beads, and a pair of load support layers, wherein
each sidewall extends from an edge of the tread substantially inward in a radial direction, each clinch extends from an edge of the sidewall substantially inward in the radial direction, each bead is located inward of the clinch in an axial direction, each load support layer is located inward of the sidewall in the axial direction, the bead includes a core and an apex, the apex is located outward of the core in the radial direction the apex includes a main body and a reinforcing portion, the main body extends from the core substantially outward in the radial direction, the reinforcing portion is located inward or outward of the main body in the axial direction and extends along the main body, when a position on an outer surface of the tire at which position a height in the radial direction from an bead base line is 14 mm is defined as a first point P1, and a position on the outer surface of the tire at which position a height in the radial direction from the bead base line is 20 mm is defined as a second point P2, the reinforcing portion overlaps each of the first point P1 and the second point P2 in the radial direction, a loss tangent of the reinforcing portion is equal to a loss tangent of the main body or less than the loss tangent, and is equal to a loss tangent of the load support layer or less than the loss tangent, a hardness of the reinforcing portion is equal to a hardness of the main body or greater than the hardness, and is equal to a hardness of the load support layer or greater than the hardness, when the loss tangent of the reinforcing portion is equal to the loss tangent of the main body, the hardness of the reinforcing portion is greater than the hardness of the main body, and when the hardness of the reinforcing portion is equal to the hardness of the main body, the loss tangent of the reinforcing portion is less than the loss tangent of the main body.