High-transverse-curvature tire, in particular for a two-wheeled vehicle
AssigneePirelli Coordinamento Pneumatici S.p.A.
InventorGiancarlo Armellin
Life of this patent
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Abstract
A front tire for-wheeled vehicles comprising a carcass of toric form having a high transverse curvature and provided with a central crown and two sidewalls terminating in a pair of beads for anchoring to a corresponding mounting rim, a tread band located on the crown and a circumferentially-inextensible belt structure disposed between the carcass and tread band. The belt structure at a radially external position is comprised of a layer of cord coils substantially disposed at a zero angle to the equatorial plane of the tire in axial side-by-side relationship and extended from one axial extremity of the belt to the other axial extremity of the belt. The winding thickness of the cord coils increasingly grows from the equatorial plane to the belt axial extremities.
Claims18
A tire for two-wheeled vehicles comprising a carcass of toric form having a high transverse curvature and provided with a central crown and two sidewalls terminating in a pair of beads for anchoring to a corresponding mounting rim, a tread band located on said crown and having a curvature ratio at least as high as 0.3, and a belt structure disposed between said carcass and tread band, circumferentially inextensible, provided with reinforcing elements oriented in a crossed direction to the equatorial plane of the tire,
- said belt comprising a radially external layer provided with a plurality of cord coils disposed at a substantially zero angle relative to the equatorial plane of the tire, positioned in axial side-by-side relationship and extended from one axial extremity of said belt to the other axial extremity of said belt,
- the winding thickness of said cord coils in said layer increasingly growing from the equatorial plane to the belt axial extremities so as to keep to a constant value the product of the mass of the cord coils disposed in a unitary portion of a given value over the axial width of said belt by the square of the distance between the center of said portion and the rotation axis of the tire, so as to cause a uniform tension state in said belt structure under the effect of the centrifugal force acting on the tire under working conditions.
Dependencies are inferred from the claim text.