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

Claim 8:
9. 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; and
a pair of run flat side reinforcing layers each located axially inward of the carcass, wherein when the tire is in its normal state,
the tire has a tread surface configured to be in contact with a road surface, 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 11.0 mm and not greater than 18.0 mm, and
an interval between the flange opposed surface and the flange is not less than 2.6 mm and not greater than 6.0 mm, the interval being measured along a line that is normal to the flange opposed surface and passes through a position, on the flange, equal to 90% of a distance in a radial direction from the bead base line to a radially outer end of the flange of the rim.