PNEUMATIC TIRE HAVING BEAD RINGS EACH FORMED BY A STACK OF RIBBONS OF CURVED SHAPE

摘要

A pneumatic tire has beads each of which is reinforced by a bead ring formed of a stack of ribbons of curved shape. The bead ring is characterized by the following features when the tire is mounted on its rim: (a) the concavity of the ribbons faces the axis of rotation of the tire; (b) a straight line connecting the ends of any ribbon forms with the axis of rotation of the tire an acute angle alpha such that alpha >/= beta +5 if beta is positive and alpha >/=5 if beta is negative, beta being the angle of the bead seat of the rim, alpha and beta being expressed in degrees.