Other

Snecma

Societe Nationale D'etude Et De Construction De Moteurs D'aviation

Daniel Olivier Bainachi

Daniel Georges Plona

Romain Nicolas Lunel

Mathieu Dakowski

Guy Franck Dusserre-Telmon

Olivier Kreder

The jet engine of the invention comprises an exhaust nozzle of variable section, comprising at least one flap pivot mounted about a pin, the pin being joined to the fixed structure of the jet engine via two braces each comprising a bore for housing the pin, the flap being pivot commanded by an actuating cylinder, connected to two fasteners which each comprise a bore through which the pin passes and about which they rotate. The jet engine is characterized by the fact that the pin, the bores of the braces and bores of the fasteners are arranged so that the contacts between the pin with the bore walls of the braces and with the bore walls of the fasteners are made over convex surfaces. Therefore, when in operation, in the event of pin bending the contact surfaces follow this convex shape and are suitably distributed.

Jet engine with a variable section nozzle of which at least one flap pivots about a pin, pins for flaps

The seal is composed of butt-jointed segments ( ) in which the bearing surface ( ) on a rotating part ( ) subject to wear, includes a hollow chamber ( ) communicating through calibrated orifices ( ) with a high pressure containment ( ). Therefore, it fills up with gas which tends to force it away from the surface, thus reducing the contact pressure without introducing excessive leaks.

Sealing arrangement with automatic clearance adjustment

Sealing unit made up of a floating body placed between a stator and a rotor, axially mobile along the stator and carrying sealing joints between a high pressure area and a low pressure area separated by the rotor. Another pair of joints and by, by stopping against rotor when the latter is displaced axially, allows a resultant pressure force to be exerted which moves floating body in the same direction as the rotor to reach a position of balance in which the elastic joints operate in satisfactory manner without being subjected to excessive wear and without breaking the seal.

Sealing unit with axial brushes controlled by static pressure in axial

Growing community of inventors

Avon, France

Daniel Olivier Bainachi