US 12,031,622 B2
Planetary gearbox for a gas turbine engine, and gas turbine engine
Stephan Uhkötter, Berlin (DE); and Rens Douma, Berlin (DE)
Assigned to ROLLS-ROYCE DEUTSCHLAND LTD & CO KG, Blankenfelde-Mahlow (DE)
Filed by Rolls-Royce Deutschland Ltd & Co KG, Blankenfelde-Mahlow (DE)
Filed on Dec. 19, 2022, as Appl. No. 18/068,332.
Claims priority of application No. 10 2021 134 169.8 (DE), filed on Dec. 21, 2021.
Prior Publication US 2023/0193991 A1, Jun. 22, 2023
Int. Cl. F16H 57/04 (2010.01); F02C 7/06 (2006.01); F02C 7/36 (2006.01); F16H 57/08 (2006.01)
CPC F16H 57/0479 (2013.01) [F02C 7/06 (2013.01); F02C 7/36 (2013.01); F16H 57/043 (2013.01); F05D 2260/40311 (2013.01); F05D 2260/98 (2013.01); F16H 2057/085 (2013.01)] 27 Claims
OG exemplary drawing
 
1. A planetary gearbox for a gas turbine engine, comprising:
a planet carrier:
a planet gear, and a plain bearing rotatably mounting the planet gear on a planet pin that is connected in a rotationally fixed manner to the planet carrier,
at least one oil feed pocket positioned in a region of an external side of the planet pin, by way of which oil feed pocket oil is guided into a bearing gap between the external side of the planet pin and an internal side of the planet gear,
the planet pin, in a circumferential region of a main load direction of the plain bearing, having a duct positioned radially within the external side of the planet pin, the duct configured to carry gearbox oil having a cross section that is closed in relation to the bearing gap, and
the duct, in a flow direction of the gearbox oil in the duct, having sequential duct portions, wherein a flow cross section of the duct in a transition region between an upstream first duct portion and a next downstream second duct portion decreases in an at least approximately step-shaped manner,
the planet carrier being rotationally fixed, and
a main load direction of the plain bearing, conjointly with a radial direction of the planet carrier, in a rotation direction of the planet gear encloses an angle of approximately 90°,
the duct being arranged in a circumferential region of the plain bearing which conjointly with the radial direction of the planet carrier, in the rotation direction of the planet gear encloses angular values in a range from 60° to 135°, and
the at least one oil feed pocket being disposed outside a circumferential region of the plain bearing which, conjointly with the radial direction of the planet carrier, in the rotation direction of the planet gear encloses angular values in a range from 10° to 100°.