US 11,879,523 B1
Planetary gear arrangement and journal pin for supporting gear
Maximilian Prölss, 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 Aug. 16, 2022, as Appl. No. 17/888,842.
Int. Cl. F16H 57/08 (2006.01); F02C 7/36 (2006.01); F16H 57/04 (2010.01)
CPC F16H 57/08 (2013.01) [F02C 7/36 (2013.01); F16H 57/043 (2013.01); F16H 57/0467 (2013.01); F05D 2260/40311 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A planetary gear arrangement comprising:
a sun gear configured to rotate about an axis of rotation of the planetary gear arrangement and defining an axial direction of the planetary gear arrangement;
a plurality of planet gears driven by the sun gear;
a ring gear engaged with the plurality of planet gears; and
a plurality of journal pins, wherein the plurality of journal pins are respectively arranged in the plurality of planet gears forming a converging gap and a diverging gap therebetween, wherein each journal pin has only one longitudinal groove or a plurality of longitudinal grooves along an outer surface thereof, and wherein the only one longitudinal groove or the plurality of longitudinal grooves is configured to guide oil along the outer surface of the journal pins when the oil is carried from the converging gap towards the diverging gap due to a rotary movement between each of the planet gears around the corresponding journal pin;
wherein the only one longitudinal groove or the plurality of longitudinal grooves extends only within a circumferential range of between 170° and 270° for each journal, where 0° is set at a maximum gap between the planet gear and the journal pin.