US 11,946,380 B2
Aircraft engine lubricant circulation
Per Widstrom, Trollhättan (SE)
Assigned to GKN Aerospace Sweden AB, Trollhättan (SE)
Appl. No. 17/299,889
Filed by GKN Aerospace Sweden AB, Trollhättan (SE)
PCT Filed Dec. 19, 2019, PCT No. PCT/EP2019/086408
§ 371(c)(1), (2) Date Jun. 4, 2021,
PCT Pub. No. WO2020/127800, PCT Pub. Date Jun. 25, 2020.
Claims priority of application No. 1820738 (GB), filed on Dec. 19, 2018.
Prior Publication US 2022/0025782 A1, Jan. 27, 2022
Int. Cl. F01D 25/18 (2006.01); F01D 25/12 (2006.01); F16N 39/02 (2006.01); F28D 21/00 (2006.01)
CPC F01D 25/18 (2013.01) [F01D 25/125 (2013.01); F16N 39/02 (2013.01); F05D 2260/207 (2013.01); F05D 2260/232 (2013.01); F16N 2210/14 (2013.01); F28D 2021/0021 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An aircraft engine circulation system, comprising:
a conduit arranged to communicate a lubricant to and from one or more bearings, said conduit comprising a central tube defining a passage for communicating lubricant and a peripheral tube surrounding the central tube and defining a space between the outer surface of the central tube and an inner surface of the peripheral tube, wherein the space includes a thermally induced phase changing material arranged to change phase when heated; and
a heat exchanger arranged to receive lubricant from the central tube.