Patent ID: 11964517
Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
Field: Transport (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A pneumatic tire comprising:
a pair of beads each including a core extending in a circumferential direction;
a carcass extending on and between one of the bead cores and the other of the bead cores;
a pair of run flat side reinforcing layers each located axially inward of the carcass;
a tread having a tread surface configured to be in contact with a road surface;
a pair of sidewalls extending radially inward from ends of the tread along the carcass, on an axially outer side of the carcass; and
a pair of clinches one located radially inward of each of the sidewalls, wherein when the tire is in its normal state,
the tire has seat contact surfaces each of which is configured to be in contact with a seat of a rim on which the tire is to be mounted, and side surfaces extending on and between the tread surface and the seat contact surfaces,
each side surface includes a flange contact surface which is in contact with a flange of the normal rim, and a flange opposed surface which abuts the flange contact surface, is located radially outward of the flange contact surface, and is the entire surface opposed to the flange,
the flange opposed surface has a diameter increasing outward in an axial direction along the entire axial extent of the flange opposed surface,
the shape of the flange opposed surface is a circular arc in every cross-section of the tire as taken along a plane including a rotation axis of the tire,
a radius of the circular arc is not less than 12.0 mm and not greater than 18.0 mm,
a radial distance from the bead base line to a radially inner end of the flange opposed surface is not less than 12.0 mm and not greater than 18.0 mm,
each clinch forms the flange contact surface and the flange opposed surface,
a complex elastic modulus of each clinch is not less than 30 MPa and not greater than 60 MPa.