An oil supply device extending around an axis, intended to supply oil to two distinct oil distribution circuits (54a, 54b) of a reduction gear, the reduction gear comprising at least one sun pinion, a planet carrier and a ring gear which are mobile in rotation relatively with respect to each other, the oil being intended to come from at least one oil injection means fixed with respect to the reduction gear, said device being intended to be fixed to the planet carrier and comprising a lubrication annular cup configured to receive oil coming from said at least one oil injection means and to allow the supply of oil to one of said oil distribution circuits (54a, 54b), the device comprising at least one further lubrication cup so that it can be staged in at least two separate lubrication stages, the further cup being configured to receive oil coming from a further oil injection means and to allow the supply of oil to a further of said oil distribution circuits, each cup supplying an associated and distinct oil circuit (54a, 54b), the cups (56a, 56b) being coaxial and of different diameters, said cups being configured to receive oil axially in a direction that is parallel to the axis and facing the associated cup (56a, 56b), or centripetally in a radial direction facing the axis, or tangentially, or according to an inclined direction combining two of said directions, at least one annular cup (56a, 56b) having an outer part having a section substantially in the shape of a U of radial orientation open towards the axis and an inner part extending the outer part starting from a branch of the U which delimits a J-or V-shaped gutter (72a, 72b) configured to receive oil jets inclined according to a direction having at least one radial centripetal component facing the axis and an axial component or axial and tangential component facing towards the cups (56a, 56b), or an open L-shaped gutter opposite the cups (56a, 56b) supplied by purely axial oil jets or axial and tangential oil jets, the annular cup (56a, 56b) being divided circumferentially into adjoining compartments (82a, 82b) which delimit as many reservoirs (59a, 59b) supplying the oil distribution circuits (54a, 54b), separated by axial walls (84a, 84b) arranged at the angular ends of said compartments (82a, 82b), free ends (86a, 86b) of said axial walls (84a, 84b) being bevelled towards the axis of the reduction gear to allow the passage of oil from a reservoir (59a, 59b) of one compartment (82a, 82b) to the reservoir (59a, 59b) of the adjacent compartment (82a, 82b). the device comprising at least one further lubrication cup so that it can be staged in at least two separate lubrication stages, the further cup being configured to receive oil coming from a further oil injection means and to allow the supply of oil to a further of said oil distribution circuits, each cup supplying an associated and distinct oil circuit (54a, 54b), the cups (56a, 56b) being coaxial and of different diameters, said cups being configured to receive oil axially in a direction that is parallel to the axis and facing the associated cup (56a, 56b), or centripetally in a radial direction facing the axis, or tangentially, or according to an inclined direction combining two of said directions, at least one annular cup (56a, 56b) having an outer part having a section substantially in the shape of a U of radial orientation open towards the axis and an inner part extending the outer part starting from a branch of the U which delimits a J-or V-shaped gutter (72a, 72b) configured to receive oil jets inclined according to a direction having at least one radial centripetal component facing the axis and an axial component or axial and tangential component facing towards the cups (56a, 56b), or an open L-shaped gutter opposite the cups (56a, 56b) supplied by purely axial oil jets or axial and tangential oil jets, the annular cup (56a, 56b) being divided circumferentially into adjoining compartments (82a, 82b) which delimit as many reservoirs (59a, 59b) supplying the oil distribution circuits (54a, 54b), separated by axial walls (84a, 84b) arranged at the angular ends of said compartments (82a, 82b), free ends (86a, 86b) of said axial walls (84a, 84b) being bevelled towards the axis of the reduction gear to allow the passage of oil from a reservoir (59a, 59b) of one compartment (82a, 82b) to the reservoir (59a, 59b) of the adjacent compartment (82a, 82b).