COUNTER-ROTATING ROTOR SYSTEM WITH STATIONARY STANDPIPE

摘要

A rotor system includes a first rotor located at a rotor axis that imparts a first axial load and a first moment, and a first shaft connected to the first rotor at the axis. A first bearing connects a gearbox to the first shaft, transferring the first axial load from the first shaft to the gearbox. A second rotor located at the axis imparts a second axial load and a second moment. A second shaft is connected to the second rotor at the axis, the second shaft coaxial with the first rotor. A second bearing connects the gearbox to the second shaft, transferring the second axial load from the second shaft to the gearbox. A nonrotating standpipe is located at the axis radially between the first shaft and the second shaft. An intershaft bearing located at the standpipe reacts the first and second moments using the first and second bearings.

主权项

1. A coaxial, dual rotor system connected to a gearbox, the system comprising:
a first rotor assembly disposed at a rotor axis and which imparts a first axial load and a first moment; a first rotor shaft operably connected to the first rotor assembly at the rotor axis to drive rotation of the first rotor assembly about the rotor axis; a first bearing assembly connecting the gearbox to the first rotor shaft and which transfers the first axial load from the first rotor shaft to the gearbox; a second rotor assembly disposed at the rotor axis and which imparts a second axial load and a second moment; a second rotor shaft operably connected to the second rotor assembly at the rotor axis to drive rotation of the second rotor assembly about the rotor axis, the second rotor shaft coaxial with and radially offset from the first rotor shaft; a second bearing assembly connecting the gearbox to the second rotor shaft and which transfers the second axial load from the second rotor shaft to the gearbox; a nonrotating standpipe disposed at the rotor axis radially between the first rotor shaft and the second rotor shaft; and an intershaft bearing assembly disposed at the standpipe and which transfers the first and second moments from the first rotor assembly and the second rotor assembly to the standpipe using the first and second bearing assemblies.