Fiatavio S.p.a.

Studio Torta

Valter Bologna

Giovanni Oddone

Luigi Tomaselli

Sergio Turra

A helicopter transmission presenting at least a first reduction unit receiving motion from a respective engine on the helicopter; and a second reduction unit connected to the first reduction unit and transmitting motion to the shaft of the main rotor; both reduction units presenting one reduction stage, and each including a pair of face gears coaxial with and facing each other and only one of which is fitted to the output shaft of the respective reduction unit; and two pinions of which one is a floating input pinion and the other is a fixed-axis pinion, and each of which meshes with both the face gears.

Application of face gears to helicopter transmissions

A speed reducer has a sun gear for connection to a turbine of an engine and a planet carrier supporting a number of planetary gears meshing with the sun gear and with the ring gear fitted to the engine mounting. According to the present invention, the planet carrier has a first annular element having pairs of seats for pins on each of which rotates one of the planetary gears. A second annular element for connection to a compressor of the engine has a number of axial arms fitted inside respective cavities of the first annular element. An end of each axial arm is connected to a portion of the first annular element that is substantially equidistant between to the seats of each of the pairs of seats.

Growing community of inventors

Grugliasco, Italy

Valter Bologna