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US 11,306,616 B2Granted
Mechanical arrangement for joining engine components
AssigneePratt & Whitney Canada Corp.
InventorsGuy Lefebvre, Francois Doyon, Remy Synnott
Life of this patent
Estimating the term…
Abstract
A turbine exhaust case assembly has an exhaust case and a bearing housing mounted in the exhaust case. A plurality of fasteners secures the bearing housing to the exhaust case. A spacer is mounted between the fasteners and one of the bearing housing and the exhaust case. The fasteners are welded to the spacer, thereby locking the fasteners against rotation.
Claims18
A turbine exhaust case assembly comprising:
- an exhaust case extending circumferentially around a central axis, the exhaust case including a plurality of circumferentially spaced-apart struts;
- a bearing housing mounted in the exhaust case;
- at least one service tube extending radially through one of said plurality of circumferentially spaced-apart struts, the at least one service tube having a radially inner end brazed to the bearing housing;
- a plurality of fasteners securing the bearing housing to the exhaust case;
- a sacrificial part mounted between the plurality of fasteners and one of the bearing housing and the exhaust case;
- and
- at least one weld between the plurality of the fasteners and the sacrificial part, the at least one weld locking the fasteners against rotation.
4 more elements
A turbine exhaust case assembly comprising:
- an exhaust case extending circumferentially around a central axis, the exhaust case having a plurality of circumferentially spaced-apart struts and a radially inner flange having a plurality of through bores aligned on a plurality of fastener axes in a circumferentially spaced apart array;
- a bearing housing having a plurality of threaded bores aligned on the fastener axes;
- one or more service tubes extending radially through respective ones of the plurality of circumferentially spaced-apart struts, the one or more service tubes having a radially inner end brazed to the bearing housing;
- a plurality of fasteners, each fastener having a head engaging the exhaust case, a shank extending through the through bore, and a threaded end engaging the threaded bore for connecting and disconnecting the exhaust case and the bearing housing when the head is rotated;
- and
- an anti-rotation device securing the head of each fastener to the exhaust case, the anti-rotation device including at least one weld on the head of each one of the plurality of fasteners.
3 more elements
A method for connecting an exhaust case and a bearing housing of a gas turbine engine, the method comprising:
- positioning the bearing housing in the exhaust case using spigot connection,
- inserting a service tube through a hollow strut of the exhaust case,
- brazing an inner end of the service tube to the exhaust case,
- fastening the bearing housing to the exhaust case using a plurality of threaded fasteners, and
- securing the plurality of threaded fasteners against rotation.
2 more elements
Dependencies are inferred from the claim text.