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US 2017/0248033 A1Published application
Core Differential Bearing With Centering Spring and Squeeze Film Damper
AssigneeGeneral Electric Company
InventorsThomas Ory Moniz, Joseph George Rose
Life of this patent
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Abstract
A counter-rotating shaft assembly of a gas turbine engine includes an outer shaft rotatable in a first direction about a virtual rotational axis, an inner shaft counter-rotatable about the virtual rotational axis in a second direction that is opposite to the first direction, a differential bearing rotatably connecting the two shafts, a centering spring connecting the inner shaft to the differential bearing, and a squeeze film damper between the differential bearing and the inner shaft.
Claims20
A counter-rotating shaft assembly of a gas turbine engine, the assembly comprising:
- a cylindrical outer shaft rotatable in a first direction about a virtual rotational axis;
- a cylindrical inner shaft rotatable about the virtual rotational axis in a second direction that is opposite to the first direction, the inner shaft being disposed radially inwardly with respect to the outer shaft;
- a differential bearing that couples the inner shaft to the outer shaft, the differential bearing including an outer race attached to the outer shaft, the differential bearing including an inner race rotatable with respect to the outer race and attached to the inner shaft via a centering spring;
- and
- a squeeze film damper disposed between the inner race and the inner shaft.
2 more elements
A gas turbine engine comprising:
- a fan assembly including a plurality of blades extending radially from a hub and rotatable about a virtual rotational axis defined centrally through the hub;
- a first compressor disposed downstream from the fan assembly;
- a first turbine disposed downstream of the compressor and coupled to the first compressor via an inner shaft;
- a second compressor disposed downstream from the fan assembly;
- a second turbine disposed downstream of the second compressor and coupled to the second compressor via an outer shaft;
- and
- a counter-rotating shaft assembly that includes:
- a differential bearing that couples the inner shaft to the outer shaft, the differential bearing including an inner race attached to the inner shaft and an outer race rotatable with respect to the inner race and attached to the outer shaft, wherein the outer shaft is rotatable about the virtual rotational axis in a first direction and the inner shaft is rotatable about the virtual rotational axis in a second direction that is opposite to the first direction, the inner shaft being disposed radially inwardly with respect to the outer shaft;
- and
- a squeeze film damper disposed between the inner race and the inner shaft.
7 more elements
Dependencies are inferred from the claim text.