Vehicle tyre with balanced lateral forces for reduced rolling resistance
AssigneePirelli Tyre S.p.A.
InventorsLuca CAMOSI, Davide MIAZZO, Ilaria GHEZZI
Life of this patent
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Abstract
A vehicle tyre with an asymmetric internal structure and external profile relative to its middle line plane. When mounted on a rim and installed with a camber angle, the rotating tyre generates lateral forces during straight-line running: a camber force from the wheel's inclination, a structural force from the asymmetric internal construction, and a conicity force from the asymmetric external profile. The conicity force opposes the camber force direction, and its magnitude remains below the structural force magnitude. This configuration enables control of the resulting lateral force while reducing rolling resistance during straight-line operation.
Claims12
A tyre for vehicle wheels,
- the tyre having an asymmetric internal structure and an asymmetric external profile with respect to a middle line plane of the tyre, wherein:
- when a wheel, comprising said tyre installed on a rim, is mounted on a vehicle with a camber angle, said camber angle generates, between the tyre rotating in rectilinear running and the ground, a lateral camber force and said asymmetric internal structure generates, between the tyre rotating in rectilinear running and the ground, a structural lateral force;
- the asymmetric external profile is configured for generating, between the tyre rotating in rectilinear running and the ground, a lateral conicity force;
- one direction of the lateral conicity force is discordant with respect to a direction of the lateral camber force and
- a modulus of the lateral conicity force is smaller than a modulus of the structural lateral force, so as to control a resulting lateral force comprising at least the lateral conicity force, the lateral camber force and the structural lateral force and to limit a rolling resistance of the tyre running on rectilinear trajectory.
The tyre according to claim from 5, wherein
- when the tyre is at the operating pressure, a radially inner and axially outer end of the sickle shape is situated between 70% and 95% of the half-width of the tyre and between 85% and 97.5% of the middle line radius of the tyre.
Dependencies are inferred from the claim text.