Tire bead structure for heavy vehicles
AssigneeCompagnie Generale des Establissments Michelin-Michelin & Cie
InventorChristian Diernaz
Life of this patent
Estimating the term…
Abstract
A tire structure with radial carcass reinforcement for heavy vehicles and rticularly a tire bead structure which makes it possible to have, on unmodified rims, sidewalls the radii of curvature of which are sufficiently great to avoid premature fatigue of the constituent reinforcement elements of the carcass as a result of the flexing cycles generated by travel. The said tire structure has at least one bead wire (2) which is located radially to the outside of the rim flange (J) and around which the turn-up (1') of the carcass (1) is formed.
Claims13
A tire for heavy vehicles mounted on a standard rim having two bead seats which are extended axially and radially towards the outside by convexly curved flanges of maximum radius R.sub.J from the axis of rotation, said tire comprising beads, at least one bead wire of inner radius R.sub.T within each bead and a radial carcass reinforcement extending around the same bead wire and anchoring the bead wire by a turn-up, characterized by the fact that
- (a) the center of gravity of a meridian section of the bead wire is located radially to the outside of the rim flange and axially to the inside with respect to the point of the rim flange of maximum radius,
- (b) the bead wire has a modulus of elasticity at least equal to 100,000 MPa and its clamping on the rim flange s=(R.sub.J -R.sub.B)/(R.sub.T -R.sub.B) is between 0.1 and 0.9, R.sub.B being the radius of the bead of the unmounted tire measured in the plane perpendicular to the axis of rotation and passing through the center of gravity of the cross section of the bead wire.
Dependencies are inferred from the claim text.