Rolls-royce Corporation

Mark Winely

Joseph A Swift

Kyle Hassler

Brian R Bennett

Kevin Chin

Philip Burkholder

Sean Warrenburg

Kevin Mock

Kyle A Hassler

A planet gear housing assembly is disclosed in an epicyclical gear system of a gas turbine engine having an engine casing. The planet gear housing assembly comprises an aft planet carrier assembly, a forward planet carrier assembly, and a plurality of planet gears. An aft flange of the aft planet carrier assembly is coupled to the engine casing to define a first torsional stiffness. A forward flange of the forward planet carrier assembly is coupled to the aft flange to define a second torsional stiffness. The second torsional stiffness may be between 60% and 80% of the first torsional stiffness. The planet gear housing assembly may further comprise a stiffening member positioned between the forward planet carrier assembly and the aft planet carrier assembly.

Stiffening member for epicyclical gear system housing assembly

A planet gear housing assembly is disclosed in an epicyclical gear system of a gas turbine engine. The planet gear housing assembly comprises an aft planet carrier assembly, a forward planet carrier assembly, and a plurality of planet gears. The planet gear housing assembly includes one or more of the following features: a stiffening member positioned between the forward and aft planet carrier assemblies, a static curvic joint coupling the forward and aft planet carrier assemblies, a plurality of roller element bearings to carry the plurality of planet gears, and one or more bearing springs disposed between a bearing and a carrier housing to accommodate relative movement.

Epicyclical gear system housing assembly

A planet gear housing assembly in an epicyclical gear assembly comprises an aft planet gear assembly and a forward planet gear assembly. The aft planet carrier assembly comprises an aft flange defining a central aperture and an annular mounting flange positioned forward of and coaxial with said central aperture, said mounting flange forming a forward facing mounting surface comprising a curvic structure. The forward planet carrier assembly comprises a forward flange defining a central aperture and an annular mounting flange positioned aft of and coaxial with said central aperture, said mounting flange forming an aft facing mounting surface comprising a curvic structure. The curvic structures of the mounting surfaces are positioned relative to each other to thereby form a static curvic joint.

Static curvic joint for epicyclical gear system housing assembly

An exemplary cone brake device includes a brake drum and a thermal sprayed coating deposited and bonded to the outer surface. The thermal sprayed coating is configured to engage a friction lining when one of the brake drum and the friction element is moved toward the other of the brake drum and the friction element, so as to decrease the speed of an aerospace propeller.

Cone brake friction surface coating

An apparatus for use in the bearing compartment of a gas turbine engine includes a first conduit and a second conduit. The first conduit defines inner and outer surfaces between an inlet end and an outlet end. The second conduit defines inner and outer surfaces between an inlet end and an outlet end. At least a portion of the second conduit is substantially coaxial with and enclosed by at least a portion of the first conduit. One of the first conduit or the second conduit is a lubricant feed to the bearing compartment. The other of the first conduit and the second conduit is the air vent from the bearing compartment.

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Avon, IN, United States of America

Mark Winely