Back to results
US 4,286,645 AGranted
Pneumatic tire with reinforced carcass and tread
AssigneeCompagnie Generale Des Etablissements Michelin
InventorJacques Boileau
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeCompagnie Generale Des Etablissements Michelin
InventorJacques Boileau
Estimating the term…
The reinforcement of a pneumatic tire comprises, proceeding in a direction from the inside towards the outside of the tire, a carcass reinforcement continuous from bead to bead and three superimposed plies of cords limited to the region of the tread. In the sidewalls of the tire, the cords of the carcass reinforcement form a substantially constant angle with the circumferential direction of the tire of between 70.degree. and 90.degree.. In the tread region of the tire, the cords of the carcass reinforcement form an angle with the circumferential direction of the tire which is smaller than the angle made by those cords in the sidewalls. The cords of the three tread plies form acute angles .alpha., .beta., and .gamma., respectively, with the circumferential direction, and the cord angle .alpha. of the one of the three tread plies nearest the carcass reinforcement and the cord angles .beta. and .gamma. of the second and third of the three plies, respectively, are related as set forth below in mathematical expressions.
A cylindrical blank for the one-step manufacture of a pneumatic tire characterized by the fact that it comprises at least one carcass ply having cords which are continuous from one bead to the other and which form a substantially constant angle of between 70.degree. and 90.degree. with respect to the circumferential direction, as well as a tread reinforcement consisting essentially of three tread plies radially outside the carcass ply adjacently superimposed on one another and on the carcass ply and having cords whose respective cord angles .alpha., .beta. and .gamma. are such that, .alpha. being the angle of the cords of the tread ply nearest the carcass ply,
A cylindrical blank for the one-step manufacture of a pneumatic tire, characterized by the fact that it comprises at least one carcass ply with cords which are continuous from one bead to the other and which form a substantially constant angle of between 70.degree. and 90.degree. with respect to the circumferential direction, as well as a tread reinforcement consisting essentially of three tread plies radially outside the carcass ply adjacently superimposed on one another and on the carcass ply and having cords whose respective cord angles are .alpha., .beta. and .gamma., the angle .alpha. of the cords of the tread ply nearest the carcass ply being such that
Dependencies are inferred from the claim text.