Patent ID: 11890898
Assignee: THE YOKOHAMA RUBBER CO., LTD.
Field: Transport (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A pneumatic tire, comprising:
a tread portion having an annular shape and extending in a tire circumferential direction;
a pair of sidewall portions disposed on both sides of the tread portion; and
a pair of bead portions disposed on inner sides in a tire radial direction of the pair of sidewall portions,
at least one carcass layer being mounted between the pair of bead portions,
the carcass layer being turned up from a tire inner side to a tire outer side around a bead core of each of the pair of bead portions,
a bead filler being disposed on an outer circumferential side of the bead core in each of the pair of bead portions,
a plurality of belt layers being disposed on an outer circumferential side of the carcass layer in the tread portion, and
a side reinforcing layer having a crescent-shaped cross-section being disposed on an inner side in a tire width direction of the carcass layer in each of the pair of sidewall portions, and
as physical properties of a rubber that constitutes the side reinforcing layer and a rubber that constitutes the bead filler, a modulus at 100% elongation being in a range from 8.4 MPa to 10.2 MPa, a tan δ at 60° C. being in a range from 0.04 to 0.08, and JIS hardness at 20° C. being in a range from 75 to 79, wherein
an outer reinforcing layer that overlaps the bead filler and the side reinforcing layer in the tire radial direction is disposed on an outer side in the tire width direction of the carcass layer in each of the pair of sidewall portions, and
as physical properties of a rubber that constitutes the outer reinforcing layer, a modulus at 100% elongation is in a range from 5.2 MPa to 6.4 MPa and JIS hardness at 20° C. is in a range from 70 to 74.