US 12,084,981 B2
Journal bearing with oil pocket
Julien Simard-Bergeron, Montreal (CA)
Assigned to PRATT & WHITNEY CANADA CORP., Longueuil (CA)
Filed by PRATT & WHITNEY CANADA CORP., Longueuil (CA)
Filed on Mar. 29, 2022, as Appl. No. 17/656,975.
Prior Publication US 2023/0313706 A1, Oct. 5, 2023
Int. Cl. F01D 25/16 (2006.01); F01D 25/18 (2006.01); F02B 39/14 (2006.01); F02C 6/12 (2006.01); F04D 29/046 (2006.01); F16C 17/02 (2006.01); F16C 17/18 (2006.01); F16C 17/24 (2006.01)
CPC F01D 25/162 (2013.01) [F01D 25/18 (2013.01); F02B 39/14 (2013.01); F02C 6/12 (2013.01); F04D 29/046 (2013.01); F16C 17/02 (2013.01); F16C 17/18 (2013.01); F16C 17/24 (2013.01); F05D 2220/40 (2013.01); F05D 2240/50 (2013.01); F05D 2260/98 (2013.01); F16C 2360/24 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A journal shaft for a journal bearing assembly of an aircraft engine, comprising:
a shaft body extending along a longitudinal axis, the shaft body having a radially outer surface and a radially inner surface radially spaced apart from the longitudinal axis to define an inner cavity; and
an oil pocket defined in the radially outer surface, one or more passages extending through the shaft body from the radially inner surface to the oil pocket to provide fluid communication between the inner cavity and the oil pocket, the oil pocket including a radially inner base surface and interconnecting transition surfaces extending between the radially inner base surface of the oil pocket and the radially outer surface of the shaft body, wherein the interconnecting transition surfaces form a fluid-dynamically smooth and edgeless transition to the radially outer surface of the journal shaft;
wherein each of the interconnecting transition surfaces defines a tangent line relative to the longitudinal axis with a maximum angle of about six degrees.