US 12,276,368 B2
Gas turbine engine casing arrangement
Ian A. MacFarlane, St-Bruno-de-Montarville (CA)
Assigned to PRATT & WHITNEY CANADA CORP., Longueuil (CA)
Filed by PRATT & WHITNEY CANADA CORP., Longueuil (CA)
Filed on Sep. 20, 2021, as Appl. No. 17/479,279.
Application 17/479,279 is a division of application No. 15/584,336, filed on May 2, 2017, granted, now 11,168,828.
Prior Publication US 2022/0003354 A1, Jan. 6, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. F04B 53/14 (2006.01); F01D 25/24 (2006.01); F01D 25/26 (2006.01); F01D 25/28 (2006.01); F04B 53/16 (2006.01); F16M 1/04 (2006.01)
CPC F16M 1/04 (2013.01) [F01D 25/243 (2013.01); F01D 25/265 (2013.01); F01D 25/28 (2013.01); F01D 25/24 (2013.01); F05D 2220/30 (2013.01); F05D 2220/32 (2013.01); F05D 2230/70 (2013.01); F05D 2230/72 (2013.01); F05D 2260/02 (2013.01); F05D 2260/4031 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A method of accessing an interior of a reverse flow turboprop engine having a low pressure (LP) spool and a high pressure (HP) spool housed in a casing including a plurality of interconnected casing segments, the LP spool including a LP turbine having an output shaft drivingly connected to both a LP shaft of a LP compressor and to a propeller via a gearbox, the LP turbine disposed forward of the LP compressor, the gearbox disposed axially between the propeller and a shaft coupling between the output shaft of the LP turbine and the LP shaft of the LP compressor, the method comprising:
decoupling a gearbox casing segment of the gearbox from a bearing housing of a bearing supporting the output shaft of the LP turbine, including decoupling mating flanges of the gearbox casing segment and the bearing housing, the bearing housing mounted within a turbine casing segment housing the LP turbine;
removing the gearbox casing segment and the gearbox to access the shaft coupling between the output shaft of the LP turbine and the LP shaft of the LP compressor; and
accessing the shaft coupling axially from a front end of the reverse flow turboprop engine via an access path extending axially through the bearing housing and the output shaft, the LP shaft of the LP compressor projecting from a first location aft of the LP turbine to a second location forward of the LP turbine inside the bearing housing where the shaft coupling is located.