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US 2009/0250296 A1Published application
Lubrication and scavenge system
AssigneeROLLS-ROYCE plc
InventorsMark Hannaford, John L. Gibbons, John Astley, Hamish Constable
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AssigneeROLLS-ROYCE plc
InventorsMark Hannaford, John L. Gibbons, John Astley, Hamish Constable
Estimating the term…
A lubrication and scavenge system for a gas turbine, capable continued operation in nose-down or nose-up orientations, has a number of oil drainage passages to return oil to one or more collection chambers adjacent a rolling element bearing. A rotary impellor in the chamber forces the oil into a scavenge off-take passageway in the chamber wall leading to a scavenge pump. However, in some orientations windage effects in the chamber can return the oil to the drainage passage rather than permitting the impellor to centrifuge it into the off-take passageway. As a result oil starvation may occur. To avoid this and improve scavenging a shield is located between the drainage path and the off-take passageway adjacent to a face of the impellor. The shield may comprise an additional member, but preferably is formed integrally with a bearing race so as to ease assembly.
A lubricant scavenge system comprising a scavenge pump, a collection chamber, at least one drainage path leading into the collection chamber, a rotary impellor located in the chamber, at least one off-take passageway in a chamber wall leading from the collection chamber to the scavenge pump, and a shield located between the drainage path and the off-take passageway adjacent a face of the impellor and acting in operation to shield the face of the impellor.
Dependencies are inferred from the claim text.