Pratt-Whitney Canada Corp

Jean-Jacques Forest

Martin Poulin

Ian A Macfarlane

Sean Powers

Maciej Piotrowski

An inner ring cooperates with an outer ring to form a roller bearing assembly. The inner ring comprises an outer circumferential surface receiving a plurality of roller bearing elements engageable with the outer ring upon forming of the roller bearing assembly. An inner circumferential surface of the inner ring is slideably mountable to a shaft upon forming of the roller bearing assembly and includes a base portion slideably engageable with a surface of the shaft upon mounting and at least one cutout portion opening to an outer edge of the inner circumferential surface. A clearance forms between a surface of the at least one cutout portion and the surface of the shaft upon mounting. Upon forming of the roller bearing assembly, the base portion of the circumferential surface is engageable with the shaft subsequently to the plurality of roller bearing elements engaging with the outer ring.

Roller bearing assembly

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.

Growing community of inventors

Verdun, Canada

Jean-Jacques Forest