Tyre with h/s form ratio < 0,6

Details Tyre with h/s form ratio < 0,6 Tyre with h/s form ratio < 0,6

B - Operations, Transporting

60

C

B60C 9/22 (2006.01) B60C 9/20 (2006.01)

Patent

CA 2281622

In order to improve the fatigue strength of the crown ply (3) of a tyre, with H/S form ratio not more than 0.6, the ply is formed radially from inside outward by a web ply (31) of metal cables orientated at 60 DEG at least, two working crown plies (32, 34) formed by inextensible metal cables orientated at angles ranging between 10 DEG and 45 DEG , between which is inserted a first additional ply (33) of metal elements substantially orientated parallel to the circumference of the tyre, a second additional ply (36) being, on each side of the tyre, radially arranged above the outermost working ply (34) and substantially centred on the end of the first additional ply (33).

Afin d'améliorer l'endurance de l'armature de sommet (3) d'un pneumatique, dont le rapport de forme H/S est au plus égal à 0,6, cette dernière est formée radialement de l'intérieur à l'extérieur d'une nappe de triangulation (31) de câbles métalliques orientés à au moins 60°, de deux nappes de sommet de travail (32, 34) formées de câbles métalliques inextensibles orientés à des angles compris entre 10° et 45°, entre lesquelles est insérée une première nappe additionnelle (33) d'éléments métalliques orientés sensiblement parallèlement à la direction circonférentielle du pneumatique, une deuxième nappe additionnelle (36) étant, de chaque côté du pneumatique, disposée radialement au-dessus de la nappe de travail (34) la plus à l'extérieur et sensiblement centrée sur l'extrémité de la première nappe additionnelle (33).

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