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 provided on the ring wheel and the sun wheel , wherein the two planes which are tangential to the rolling surfaces 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 provided on the ring wheel and the sun wheel , wherein the two planes which are tangential to the rolling surfaces 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 . <EOS>