Heavy-duty pneumatic tire

摘要

A heavy-duty pneumatic tire includes a carcass including a carcass ply extending from a tread portion through a sidewall portion and turned up around a bead core of a bead portion. The bead core includes a radially inner surface extending along a bottom surface of the bead portion in the radial direction of the tire. Under both conditions that include an unloaded standard condition where the tire is mounted on a standard rim and inflated to regular internal pressure and a loaded standard condition where the tire in the unloaded standard condition above is loaded with a regular load and grounded at a camber angle of 0 degrees, the tire has an angle between the radially inner surface of the bead core and a rim sheet surface of the standard rim being in a range of 0 plus/minus 3 degrees.

主权项

1. A wheel assembly comprising a heavy-duty pneumatic tire and a standard rim comprising
a carcass comprising a carcass ply extending from a tread portion through a sidewall portion and turned up around a bead core of a bead portion, wherein said bead core has a cross section having a substantially hexagonal shape including a radially inner surface extending along a bottom surface of said bead portion, and under two conditions that include: an unloaded standard condition where the tire is mounted on the standard rim and inflated to a regular internal pressure; and a loaded standard condition where the tire in the unloaded standard condition is loaded with a regular load and grounded at a camber angle of 0 degrees; an angle between said radially inner surface of said bead core and a rim sheet surface of said standard rim is in a range of 0 plus/minus 3 degrees, wherein in a free condition of the tire that the tire is not mounted on the rim, an angle θa between the radially inner surface of the bead core and an inward portion under the bead core on the bottom surface of the bead portion is in a range of from 3 to 10 degrees.