Eurocopter

Avio S.p.a.

Thierry Sandrart

Lionel Thomassey

Glacomo Orsini

Giacomo Orsini

An installation includes at least a pressurized lubricating circuit for elements housed in the rocking crankcase, each circuit including a radial transfer bearing between two opposite cylindrical journals coaxial about the rocking axis, one fixed journal on a fixed part and one pivoting journal on a pivoting part integral with the pivoting crankcase. Each transfer bearing has two U-shaped annular gaskets facing each other and spaced apart along the rocking axis so as to define between them an annular pressurized liquid lubricant chamber. The annular chamber is supplied with pressurized liquid lubricant by at least a supply duct integrated in the fixed part and whose upstream part is connected to a pressurized lubricant source, and feeds the rocking crankcase with pressurized lubricant through a dispensing duct emerging into the rocking crankcase. The invention is useful for lubricating rocking power transmission boxes for convertible aircraft tilt rotors.

Lubricating installation for rocking power transmission box

A transmission gearbox () has a casing () that tilts around a tilting axis (B&#x2014;B) via two bearings (). Each of the bearings includes: a fixed part () having a sleeve (); and a trunnion () which belongs to a pivoting part () and which pivots around the sleeve, the pivoting part being solidly connected to the casing (). A shouldered wear ring () is disposed between the sleeve () and the trunnion () of each bearing (). The invention is suitable for use in the pivot mounting of a power transmission gearbox () that is used to rotate the tilting rotor () of a convertible aircraft.

Tilting transmission gearbox comprising a pivoting connection with plain bearings

A pivoting power transmission unit is provided for driving a tiltable rotor of a convertible aircraft. The casing of the pivoting transmission unit comprises a lower casing, by which the casing is able to pivot on a support by two bearings each having a stationary part integral with the support and a swivelling part. The lower casing is assembled to an upper casing in which a drive shaft connected in rotation to gears housed in the casing is mounted so as to rotate about an axis of rotation perpendicular to the pivot axis of the casing. The upper casing is supported by an arrangement configured to transfer to the support via said bearings load/thrust forces experienced by the drive shaft during use.

Pivoting power transmission unit with load transfer via the casing

A pivoting power transmission unit is provided for transmitting rotational drive to a rotor configured to revolve about an axis of rotation and configured to be swivelled about a pivot axis substantially perpendicular to said rotation axis. The unit comprises a casing mounted between two parts of a support by two bearings co-axial with the pivot axis. Each bearing includes a stationary part attached to the support, swivelling part attached to the casing and a wear take-up ring disposed therebetween. The unit further comprises a device to take up axial play between the casing and the support. The device includes an annular piston, sliding axially in a chamber fed with fluid under pressure, and bearing against an axial end of the wear take-up ring.

Growing community of inventors

Velaux, France

Thierry Sandrart