A worm gear assembly may include an input shaft having a first and second screw formed axially thereon, a first torque transfer unit comprising a first worm wheel operatively coupled to the first worm screw, a first radial pinion coaxially affixed to the first worm wheel, and a first axial crown wheel operatively coupled to the first radial pinion, and a second torque transfer unit comprising a second worm wheel operatively coupled to the second worm screw, a second radial pinion coaxially affixed to the second worm wheel, and a second axial crown wheel operatively coupled to the second radial pinion, wherein the first radial pinion is in meshed interface with the second radial pinion, and wherein torque differences between the first axial crown wheel and the second axial crown wheel are transmitted at least in part through said meshed interface.

A spur toothing includes a plurality of radially extending teeth arranged on an end face, circumferentially adjacent to one another, and arranged to mesh with a mating toothing. Each tooth of the plurality of radially extending teeth has tooth flanks, a tooth tip, and a radially outer tooth profile face. A transition from the tooth flanks to the radially outer tooth profile face has a shaping radii. A tool for producing the spur toothing is also disclosed.

A wobble plate drive system may include a stator having a central axis and a plurality of stator teeth disposed on an inner cylindrical surface. The system may further include a wobble plate having a wobble axis disposed at a non-zero angle relative to the central axis, an outer cylindrical surface, and an upper annular surface. A plurality of wobble teeth may be disposed on the outer cylindrical surface and a plurality of face teeth may be disposed on the upper annular surface. The system may further include an output gear having an output axis substantially aligned with the central axis and a lower annular surface. A plurality of output teeth may be disposed on the lower annular surface. The wobble plate may be configured to rotate, the plurality of wobble teeth may be configured to engage with the plurality of stator teeth, and the plurality of face teeth may be configured to engage with the plurality of output teeth as the wobble plate nutates around the stator.

A power transmission gearbox having at least one driving gear with spur teeth presenting a large radius. The gearbox includes at least one mechanical outlet drive system suitable for driving an accessory, the mechanical outlet drive system having a gear with face teeth referred to as an accessory pinion, the accessory pinion presenting a small radius (R2) lying orthogonally between each face tooth and its axis of rotation, the small radius (R2) being smaller than the large radius (R1).

A carrier rotatably supports a first pinion gear and a second pinion gear that rotate integrally with each other. One of the carrier and a ring gear is connected to a first gear so as to rotate integrally with the first gear. A second gear meshes with the first gear. The first gear and the second gear are each a double helical gear having a pair of tooth portions with mutually opposite helix directions. The first pinion gear and the second pinion gear are each a helical gear. The helix directions of the tooth portions of the first pinion gear and the second pinion gear are set such that the thrust load that the first pinion gear receives from a sun gear and the thrust load that the second pinion gear receives from the ring gear are opposite to each other.

A mechanical positioning device for positioning a component includes a first toothed crown integrally connected, during use, to the component and rotating around a rotation axis and including a first toothing having N1 teeth and a lower toothing; a fixed second toothed crown including a second toothing having N2 teeth and an upper toothing; and a third toothed crown interposed between the first and second crowns and rotating around the rotation axis. The third crown includes a third toothing, a primary coupling toothing having the same number of teeth of the lower toothing, and a secondary coupling toothing having the same number of teeth of the upper toothing. At least one satellite gear is brought in rotation around the rotation axis by the third crown and engaged to the first and second toothings. N1 is different from N2. The device is configurable between a closed configuration wherein the first, second, and third crowns are integral with each other, and an open configuration wherein the first, second, and third crowns are spaced from each other.