Pratt-Whitney Canada Corp

Thierry Stocco

Franco Di Paola

Othmane Leghzaouni

A turbomachine comprises a primary rotor part and a secondary rotor part mounted to the primary rotor part for joint rotation therewith. The primary part and secondary parts have a tight fit between a radially inner diameter surface of the secondary part and a radially outer diameter surface of the primary part. The primary part has a radial stop operable to limit centrifugal growth of the secondary part when a maximum operating speed of the primary rotor is exceeded. The radial stop includes a radially inner surface facing an associated radially outer surface of the secondary part. When an operating speed of the primary part is inferior to the maximum operating speed, the radial stop of the primary part and the associated radially outer surface of the secondary part are spaced by a radial gap sized to close when the maximum operating speed is exceeded.

Radial transition fit between primary and secondary parts of a rotor assembly

A rotor assembly comprises a rotor having annular flange including a plurality of protrusions axisymmetrically disposed about the annular flange, each protrusion having a mounting aperture for selectively receiving a balancing feature, and a plurality of slots axisymmetrically disposed about the circumference of the annular flange between adjacent protrusions. Each slot has a pair of converging flat portions extending axially inwardly from an adjacent protrusion end, an inner flat portion at an inner end of each slot, and a pair of curved portions respectively joining each converging flat portion to the inner flat portion in each slot. Each slot has a depth at least as great as an adjacent mounting aperture depth extending normally from the adjacent protrusion end to a far end of the corresponding mounting aperture.

Rotor balance assembly

A retention assembly for interconnecting first and second rotating components in a gas turbine engine. The second component includes an engagement portion defining protrusions circumferentially spaced apart and extending axially therefrom. A threaded fastener axially retains the second rotating component to the first and has key-receiving slots and a circumferentially-extending groove. A key washer is mounted to the fastener and defines first and second axial surfaces. The key washer has a first set of keys extending radially inwardly from a radially inner surface and received within the key-receiving slots and a second set of keys extending from the second axial surface. A retaining ring is disposed within the groove, is radially retained by the protrusions extending axially from the second component, axially retained between the second set of keys and the second axial surface, and radially spaced apart from the second set of keys to define a radial gap therebetween.

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Longueuil, Canada

Thierry Stocco