US 11,746,665 B2
Bushing for variable vane in a gas turbine engine
Pantcho P. Stoyanov, West Hartford, CT (US); and Mary E. Makowiec, Manchester, CT (US)
Assigned to RTX Corporation, Farmington, CT (US)
Filed by Raytheon Technologies Corporation, Farmington, CT (US)
Filed on May 27, 2022, as Appl. No. 17/827,235.
Application 17/827,235 is a division of application No. 16/431,334, filed on Jun. 4, 2019, granted, now 11,346,235.
Prior Publication US 2022/0282629 A1, Sep. 8, 2022
Int. Cl. F01D 9/04 (2006.01); F01D 17/16 (2006.01)
CPC F01D 9/041 (2013.01) [F01D 9/042 (2013.01); F01D 17/162 (2013.01); F05D 2220/32 (2013.01); F05D 2240/12 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of operating a variable vane for a gas turbine engine, the method comprising:
locating a first bushing at least partially surrounding a first trunnion extending from a first end of the variable vane, the first trunnion includes an outer surface having a plurality of troughs and the first bushing includes a plurality of peaks extending inward from an inner surface;
producing relative movement between the first bushing and the first trunnion to form a carbon transfer film between the first bushing and the first trunnion; and
the relative movement between the first bushing and the first trunnion wears the plurality of peaks down to form the carbon transfer film.