US 11,674,449 B2
Mount assembly for accessory gearbox of aircraft engine and associated method of assembly
Paul Weaver, Chateauguay (CA); Krzysztof Gajowniczek, Rzeszow (PL); and Mélanie Brillant, Saint-Amable (CA)
Assigned to PRATT & WHITNEY CANADA CORP., Longueuil (CA)
Filed by PRATT & WHITNEY CANADA CORP., Longueuil (CA)
Filed on Mar. 12, 2021, as Appl. No. 17/200,292.
Prior Publication US 2022/0290615 A1, Sep. 15, 2022
Int. Cl. F02C 7/32 (2006.01); F02C 7/36 (2006.01); F01D 25/28 (2006.01)
CPC F02C 7/32 (2013.01) [F02C 7/36 (2013.01); F01D 25/28 (2013.01); F05D 2220/323 (2013.01); F05D 2220/50 (2013.01); F05D 2230/60 (2013.01); F05D 2240/91 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An aircraft engine comprising:
a casing extending along and around an axis, the casing having a first localizing feature and a shaft aperture;
an accessory gearbox having a second localizing feature and a driveshaft port, the second localizing feature engaged with the first localizing feature;
a driveshaft extending radially relative the axis, through the shaft aperture, the driveshaft engaged with the driveshaft port, a front and a rear defined in opposite directions from the driveshaft along the axis, a left side and a right side defined in opposite directions from the driveshaft in a lateral orientation transversal to the axis;
a first bracket having a proximal end secured to the casing on a first one of the left side and right side and a first one of the front and the rear, and a distal end having a first clearance hole, the first bracket fastened to the accessory gearbox by a first fastener having a first shaft extending through the first clearance hole, a first clearance being defined by a difference between a size of the first clearance hole and a size of the first shaft, the first clearance providing a degree of freedom for movement of the first shaft in the first clearance hole, and
a second bracket having a proximal end secured to the casing on the first one of the left side and right side and a second one of the front and the rear opposite the first one of the front and the rear, and a distal end having a second clearance hole, the second bracket fastened to the accessory gearbox by a second fastener having a second shaft extending through the second clearance hole, a second clearance being defined by a difference between a size of the second clearance hole and a size of the second shaft, the second clearance providing a degree of freedom for movement of the second shaft in the second clearance hole;
wherein the casing has a sequence of at least three sections each extending circumferentially around the axis, including a first section secured to a second section at a first structural annular flange arrangement, a third section secured to the second section at a second structural annular flange arrangement, the second section having the shaft aperture and the first localizing feature, the proximal end of the first bracket secured to the first structural annular flange arrangement, the proximal end of the second bracket secured to the second structural annular flange arrangement, the first structural annular flange arrangement and the second structural flange arrangement extending circumferentially around the axis
wherein a relative position between the distal end of the first bracket and the distal end of the second bracket is determined from an assembly tolerance stackup set by the engagement between the first localizing feature and the second localizing feature, the first clearance and the second clearance configured to accommodate the assembly tolerance stackup.