General Electric Company

Jonothan Allen Scheetz

Ning Fang

Duane Howard Anstead

Brandon Wayne Miller

Mohammed El Hacin Sennoun

Kenneth Lee Fisher

Kyle Robert Snow

Bala Corattiyil

Mark Alan Rhoads

Gary Paul Moscarino

Prasad Laxman Kane

Ray Harris Kinnaird

Michael Gilbert Johnson

Dave William Pugh

Edward William Grace

A gas turbine engine having a core engine. The core engine includes an inlet, a compressor section, a combustion section, a turbine section, and an exhaust. The gas turbine engine also includes a bearing sump arranged in the core engine for containing lubrication, the bearing sump and lubrication having an operational range between at least about 0&#xb0; F. and about 550&#xb0; F.

Gas turbine engine bearing sump and lubricant drain line from cooling passage

A rotating seal for a gas turbine engine includes: (a) an annular seal body; (b) a sealing component carried by the seal body which is adapted to form one-half of a rotating seal interface; and (c) an impeller carried by the seal body which comprises a plurality of radially-inwardly-extending impeller blades.

Dynamic impeller oil seal

A roller bearing that provides ball and roller bearing elements comprised of M50 steel and M50NiL steel having surface hardnesses above 60 HRC, and in the range of 65-72 HRC. The hardness in the surface region is achieved by nitriding the surface to achieve a high hardness and extended life. This improvement is brought about by controlling the microstructure of the alloy by minimizing the formation of retained austenite. The material is tempered as required. The surface is then nitrided, but the nitriding operation is carefully controlled to avoid the formation of intergranular nitrides. Because of the method used to prevent the formation of intergranular nitrides, some carbon may be present to prevent the surface of the steel from becoming depleted of carbon. The hardening element in this nitro-carburizing operation is nitrogen, which forms iron nitride as FeN or FeN intragranularly. The purpose of the carbon in the operation is to maintain the concentration of carbon in the surface of the bearing so that the properties are not altered by decarburizing the surface. Standard gaseous and plasma nitriding techniques also may be used for the nitriding operation.

Spall propagation properties of case-hardened M50 and M50NiL bearings

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Waynesville, OH, United States of America

Jonothan Allen Scheetz