Gas turbine engine
AssigneeROLLS-ROYCE plc
InventorJason J MADGE
Life of this patent
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Abstract
A gas turbine engine comprises a gearbox comprising a sun gear, an annulus gear, a plurality of planet gears and a planet gear carrier. The sun gear meshes with the planet gears and the planet gears mesh with the annulus gear. Each planet gear is rotatably mounted in the planet gear carrier. The planet gear carrier comprises a plurality of axles arranged parallel to the axis of the gearbox. The axially spaced ends of each axle are secured to the planet gear carrier. Each planet gear is rotatably mounted on a corresponding one of the axles by a bearing arrangement. Each bearing arrangement comprises a journal bearing and a rolling element bearing and each planet gear is rotatably mounted on a journal bearing and each journal bearing is rotatably mounted on an axle by at least one rolling element bearing.
Claims20
A gas turbine engine comprising a bearing arrangement for first and second relatively rotatable members, the bearing arrangement comprising a journal bearing and a rolling element bearing, the second member being arranged coaxially around the first member, the second member having a cylindrical inner surface, the rolling element bearing and the journal bearing being arranged radially between the first member and the second member, the rolling element bearing being positioned radially between the first member and the journal bearing and the journal bearing being positioned radially between the rolling element bearing and the second member, the journal bearing comprising a tubular member, the tubular member having a cylindrical outer surface arranged to cooperate with the cylindrical inner surface of the second member, the tubular member and the second member being relatively rotatable, the bearing arrangement comprising a lubricant supply to supply lubricant to the rolling element bearing and the journal bearing having at least one passage extending radially there-through to supply lubricant from the rolling element bearing to the journal bearing.
A gearbox comprising a sun gear, an annulus gear, a plurality of planet gears and a planet gear carrier, the sun gear meshing with the planet gears and the planet gears meshing with the annulus gear, each planet gear being rotatably mounted in the planet gear carrier, the planet carrier comprising a plurality of axles arranged parallel to the axis of the gearbox, the axially spaced ends of each axle being secured to the planet carrier, each planet gear being rotatably mounted on a corresponding one of the axles by a bearing arrangement, each bearing arrangement comprising a journal bearing and a rolling element bearing, each planet gear being rotatably mounted on a journal bearing and each journal bearing being rotatably mounted on an axle by at least one rolling element bearing, each planet gear having a cylindrical inner surface, each journal bearing comprising a tubular member, the tubular member of each journal bearing having a cylindrical outer surface arranged to cooperate with the cylindrical inner surface of the corresponding planet gear, each tubular member and the corresponding planet gear being relatively rotatable, the bearing arrangement comprising a lubricant supply to supply lubricant to each rolling element bearing and each journal bearing having at least one passage extending radially there-through to supply lubricant from the corresponding rolling element bearing to the journal bearing.
A bearing arrangement for first and second relatively rotatable members, the bearing arrangement comprising a journal bearing and a rolling element bearing, the second member being arranged coaxially around the first member, the second member having a cylindrical inner surface, the rolling element bearing and the journal bearing being arranged radially between the first member and the second member, the rolling element bearing being positioned radially between the first member and the journal bearing and the journal bearing being positioned radially between the rolling element bearing and the second member, the journal bearing comprising a tubular member, the tubular member having a cylindrical outer surface arranged to cooperate with the cylindrical inner surface of the second member, the tubular member and the second member being relatively rotatable, the bearing arrangement comprising a lubricant supply to supply lubricant to the rolling element bearing and the journal bearing having at least one passage extending radially there-through to supply lubricant from the rolling element bearing to the journal bearing.
Dependencies are inferred from the claim text.