A planetary gearing comprising: a predetermined number of planet gears provided with a meshing band, a planet gear carrier, provided with two walls (8, 9), on which the planet gears are mounted, supporting pins supporting the planet gears and defining a respective longitudinal axis, each supporting pin comprising: - a first end segment fixed to a first wall of said two walls, - a second end segment fixed to a second wall of said two walls, - a third central segment (20; 30, 31) having diameter larger than the diameter of said second end segment whereby an annular shoulder is defined between the third central segment (20; 30, 31) and the second end segment, wherein an annular groove is provided on said annular shoulder having a depth along the longitudinal axis lower than the extension of the meshing band of the planet gear along the same longitudinal axis, whereby an annular end portion of said central segment, which surrounds said annular groove, defines a yielding area of the supporting pin; characterized in that a ring, having a rigidity greater than or equal to the rigidity of said annular end portion, is at least partly inserted in the annular groove to act as a mechanical stop for said yielding area which may yield, under load, up to a contact with the ring. a predetermined number of planet gears provided with a meshing band, a planet gear carrier, provided with two walls (8, 9), on which the planet gears are mounted, supporting pins supporting the planet gears and defining a respective longitudinal axis, each supporting pin comprising: - a first end segment fixed to a first wall of said two walls, - a second end segment fixed to a second wall of said two walls, - a third central segment (20; 30, 31) having diameter larger than the diameter of said second end segment whereby an annular shoulder is defined between the third central segment (20; 30, 31) and the second end segment, wherein an annular groove is provided on said annular shoulder having a depth along the longitudinal axis lower than the extension of the meshing band of the planet gear along the same longitudinal axis, whereby an annular end portion of said central segment, which surrounds said annular groove, defines a yielding area of the supporting pin; - a first end segment fixed to a first wall of said two walls, - a second end segment fixed to a second wall of said two walls, - a third central segment (20; 30, 31) having diameter larger than the diameter of said second end segment whereby an annular shoulder is defined between the third central segment (20; 30, 31) and the second end segment, wherein an annular groove is provided on said annular shoulder having a depth along the longitudinal axis lower than the extension of the meshing band of the planet gear along the same longitudinal axis, whereby an annular end portion of said central segment, which surrounds said annular groove, defines a yielding area of the supporting pin; characterized in that a ring, having a rigidity greater than or equal to the rigidity of said annular end portion, is at least partly inserted in the annular groove to act as a mechanical stop for said yielding area which may yield, under load, up to a contact with the ring.