A planetary variator applicable in a variable transmission for realizing a variable speed and torque ratio, the variator comprising a ring wheel, at least two planet wheels and a sun wheel, wherein: • the ring wheel and the sun wheel are axisymmetric bodies positioned with respect to a common central symmetry axis, • the planet wheels comprise a shaft portion and a wheel portion that is rotatable about the shaft portion, the shaft portion having a longitudinal central axis, said axis being also the rotation axis of the wheel portion, • each planet wheel is freely rotatable about a hinge axis that is oriented essentially perpendicularly with respect to the plane defined by the common central axis and the rotation axis of the wheel portion of the planet wheel, • the interaction between the wheels takes place through a rolling motion of a rolling surface provided on each of the planet wheels' wheel portions, on rolling surfaces (20,21) provided on the ring wheel and the sun wheel, wherein the two planes (26,27) which are tangential to the rolling surfaces (20,21) of the ring wheel and the sun wheel, in the tangential contact points with a planet wheel, intersect with the rotation axis of the wheel portion of said planet wheel in a point of the common central axis, regardless of the angular position of said planet wheel about the hinge axis, and wherein: the hinge axis of each of the planet wheels is eccentric to the common central axis with constant eccentricity, and a distance between the wheel portion and the hinge axis is constant, characterized in that the planetary variator is configured to actuate a change of the angular position (γ) of the planet wheels and therewith a change of a transmission ratio by a relative axial motion between the hinge axis and the ring wheel and/or a relative axial motion between the hinge axis and the sun wheel. • the ring wheel and the sun wheel are axisymmetric bodies positioned with respect to a common central symmetry axis, • the planet wheels comprise a shaft portion and a wheel portion that is rotatable about the shaft portion, the shaft portion having a longitudinal central axis, said axis being also the rotation axis of the wheel portion, • each planet wheel is freely rotatable about a hinge axis that is oriented essentially perpendicularly with respect to the plane defined by the common central axis and the rotation axis of the wheel portion of the planet wheel, • the interaction between the wheels takes place through a rolling motion of a rolling surface provided on each of the planet wheels' wheel portions, on rolling surfaces (20,21) provided on the ring wheel and the sun wheel, wherein the two planes (26,27) which are tangential to the rolling surfaces (20,21) of the ring wheel and the sun wheel, in the tangential contact points with a planet wheel, intersect with the rotation axis of the wheel portion of said planet wheel in a point of the common central axis, regardless of the angular position of said planet wheel about the hinge axis, the hinge axis of each of the planet wheels is eccentric to the common central axis with constant eccentricity, and a distance between the wheel portion and the hinge axis is constant, characterized in that the planetary variator is configured to actuate a change of the angular position (γ) of the planet wheels and therewith a change of a transmission ratio by a relative axial motion between the hinge axis and the ring wheel and/or a relative axial motion between the hinge axis and the sun wheel.