Abstract: A disclosed gas turbine engine includes a compressor section including a first compressor disposed axially forward of a second compressor, a combustor in fluid communication with the compressor section and a turbine section in fluid communication with the combustor. The turbine section includes a first turbine driving the first compressor and a second turbine driving the second compressor. An inner shaft defines a driving link between the second compressor and the second turbine and an outer shaft defines a driving link between the first compressor and the first turbine. The inner shaft and the outer shaft are concentric about a common axis of rotation. A bumper is disposed on the inner shaft within an axial region common to an aft portion of the outer shaft for accommodating interaction between the inner and outer shafts during high load conditions.

Abstract: An example coupling stack includes a first rotating member and a second rotating member. A plurality of aligned slots is defined in the first rotating member and the second rotating member. A tab lock is provided having an annular body with an axial front side, an axial back side, and a radial inner periphery. Tabs are formed on the axial back side and inserted into the plurality of aligned slots. The annular body of the tab lock also includes a plurality of openings extending into the radial inner periphery. A plurality of flanges is provided on the axial back side of the annular body adjacent to the plurality of openings.

Abstract: A disclosed gas turbine engine includes a compressor section including a first compressor disposed axially forward of a second compressor, a combustor in fluid communication with the compressor section and a turbine section in fluid communication with the combustor. The turbine section includes a first turbine driving the first compressor and a second turbine driving the second compressor. An inner shaft defines a driving link between the second compressor and the second turbine and an outer shaft defines a driving link between the first compressor and the first turbine. The inner shaft and the outer shaft are concentric about a common axis of rotation. A bumper is disposed on the inner shaft within an axial region common to an aft portion of the outer shaft for accommodating interaction between the inner and outer shafts during high load conditions.

Abstract: An example coupling stack includes a first rotating member and a second rotating member. A plurality of aligned slots is defined in the first rotating member and the second rotating member. A tab lock is provided having an annular body with an axial front side, an axial back side, and a radial inner periphery. Tabs are formed on the axial back side and inserted into the plurality of aligned slots. The annular body of the tab lock also includes a plurality of openings extending into the radial inner periphery. A plurality of flanges is provided on the axial back side of the annular body adjacent to the plurality of openings.

Abstract: An example coupling stack includes a first rotating member and a second rotating member. A plurality of aligned slots is defined in the first rotating member and the second rotating member. A tab lock is provided having an annular body with an axial front side, an axial back side, and a radial inner periphery. Tabs are formed on the axial back side and inserted into the plurality of aligned slots. The annular body of the tab lock also includes a plurality of openings extending into the radial inner periphery. A plurality of flanges is provided on the axial back side of the annular body adjacent to the plurality of openings.

Abstract: An example coupling stack includes a first rotating member and a second rotating member. A plurality of aligned slots is defined in the first rotating member and the second rotating member. A tab lock is provided having an annular body with an axial front side, an axial back side, and a radial inner periphery. Tabs are formed on the axial back side and inserted into the plurality of aligned slots. The annular body of the tab lock also includes a plurality of openings extending into the radial inner periphery. A plurality of flanges is provided on the axial back side of the annular body adjacent to the plurality of openings.