Pratt-whitney Canada Corp

Martin Poulin

Lazar Mitrovic

Alain Lewis

Robert Gautier

Eric Durocher

Keith Morgan

Jean Dubreuil

Sean Powers

Jean-Jacques Forest

Louis Brillon

Ian A Macfarlane

Roberto Brito

An assembly for a gas turbine engine having: static and rotating components; a seal between the static and rotating components, and between a cavity and an environment outside thereof, the cavity having an inlet fluidly connectable to a source of lubricant and an outlet fluidly connectable to a scavenge pump for drawing lubricant out of the cavity; and a drain conduit having a drain inlet outside the cavity in proximity to the seal for receiving leaked lubricant, and a drain outlet fluidly connected to the outlet of the cavity, the drain outlet located in proximity to a scavenge inlet via which the lubricant exits the cavity to flow toward the scavenge pump such that, in use, a lubricant flow within the drain conduit is entrained by the lubricant exiting the cavity via the scavenge inlet.

Lubricant drain conduit for gas turbine engine

A journal bearing assembly for rotatably supporting at least one gear, comprising a pin and a journal shaft. The journal shaft includes an inner cavity receiving the pin and an outer surface including a plurality of contact surfaces supporting the at least one gear and at least one annular groove separating adjacent contact surfaces. The pin is configured to support the journal shaft at a support position in the inner cavity.

Dual land journal bearings for a compound planetary system

An engine includes first and second power inputs, and a power output. A transmission includes an epicyclic gear train engaged with the first power input and selectively engageable with the power output. The gear train has a sun gear centrally disposed and defining a center axis of the gear train, a ring gear, and planet gears mounted to a carrier. The planet gears are rotatable about respective planet gear axes. The planet gears are disposed in meshed engagement with the sun gear and the ring gear. A brake engageable in a first position with one of the sun gear, the carrier, and the ring gear slows a rotation thereof to transfer power from the first power input to the power output. The brake in a second position is disengageable from the sun gear, the carrier or the ring gear to decouple the first power input from the power output.

Transmission for engine with two power inputs

A multi-spool gas turbine engine comprises a low pressure (LP) spool and a high pressure (HP) spool independently rotatable about a central axis extending through an accessory gear box (AGB). The LP spool has an LP compressor, which is axially positioned between the HP compressor of the HP spool and the AGB. A tower shaft drivingly connects the HP spool to the AGB.

Multi-spool gas turbine engine architecture

A gearbox for an aircraft engine including first and second gears in driving engagement through planet gears supported by a carrier. Selective application of a brake and a blocking member permit operation in a speed change configuration and a direct drive configuration.

Gearbox for gas turbine engine

A multi-spool gas turbine engine comprises a low pressure (LP) spool and a high pressure (HP) spool. The LP spool has an LP shaft for transferring a torque from an LP turbine to an LP compressor. The HP spool has an HP shaft for transferring a torque from an HP turbine to an HP compressor. The LP shaft is coaxially mounted inside the HP shaft. An inter-shaft bearing is mounted radially between the LP shaft and the HP shaft. The inter-shaft bearing is disposed axially between the HP compressor and the LP compressor.

Inter-shaft bearing connected to a compressor boost system

A gas turbine engine has a LP spool including an LP shaft and a HP spool including an HP shaft, an accessory gear box (AGB) drivingly engaged to a plurality of accessories, an engine starter drivingly engaged to the AGB, and a drive shaft drivingly engaged to the AGB. In a first engine mode, the drive shaft is drivingly engaged to the HP shaft and is disengaged from the LP shaft, the engine starter is in driving engagement with the HP shaft via the drive shaft, and the LP shaft is disengaged from the AGB. In a second engine mode, the drive shaft is drivingly engaged to the LP shaft and is disengaged from the HP shaft, the LP shaft is in driving engagement with the AGB via the drive shaft, and the HP shaft is disengaged from the AGB.

Multi-spool gas turbine engine

Reverse flow multi-spool gas turbine engine with aft-end accessory gearbox drivingly connected to both high pressure spool and low pressure spool

An epicyclic gear train includes a sun gear rotatable about a central axis, a concentric outer ring gear, and a plurality of gears mechanically intermediate the sun gear and the ring gear, and which are in meshing engagement therewith. An epicyclic carrier assembly comprises a gear support member and a coupling adapter. The gear support member is adapted to rotatably support the plurality of gears on axles between first and second axle ends. The gear support member has at least a first connecting member. The coupling adapter is disposed concentrically with the gear support member and has a second connecting member. The second connecting member is engaged with the first connecting member to structurally join the coupling adapter and the gear support member. The first and second connecting members are mounted to one another in a plane between the first and second axle ends.

Reduced twist carrier

A torque transfer assembly adapted for use in a planetary gear train is provided. The torque transfer assembly comprises generally a planetary carrier and a torque transfer coupling adapter. The planetary carrier is adapted to rotatably support the plurality of planet gears between a first and second planes. The planetary carrier also has a first connecting member extending therefrom. The torque transfer coupling adapter is disposed concentrically and rotatably with the planetary carrier, and has a central torque output element and a second connecting member extending from it. The second connecting member is adapted to be engaged with the first connecting member to structurally join the coupling adapter and the planetary carrier, the first and second connecting members being structurally joined together between the first and second planes.

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Mont Saint-Hilaire, Canada

Martin Poulin