Oil scupper system for bearing housing of gas turbine engine

Patent metadata

Field	Value
Publication number	US-9683458-B2
Application number	US-201514831320-A
Country	US
Kind code	B2
Filing date	Aug 20, 2015
Priority date	Aug 20, 2015
Publication date	Jun 20, 2017
Grant date	Jun 20, 2017

Abstract

A bearing housing comprises a body having a partition wall delimiting the bearing housing from an environment and defining a bearing housing interior cavity configured to receive an oil feed. An inlet bore is in the partition wall in fluid communication with the bearing housing interior cavity. The inlet bore is configured to receive an end of an oil tube, the inlet bore comprising a contact surface configured for contacting the oil tube. A seal is between the inlet bore and the oil tube. An oil recuperation passage is defined in the partition wall in fluid communication with the inlet bore between the seal and at least a portion of the contact surface, the oil recuperation passage being in fluid communication with an oil recuperating cavity.

First claim

What is claimed is:

1. A bearing housing comprising:
a body having a partition wall delimiting the bearing housing from an environment and defining a bearing housing interior cavity configured to receive an oil feed;
an inlet bore in the partition wall in fluid communication with the bearing housing interior cavity, the inlet bore configured to receive an end of an oil tube, the inlet bore comprising a contact surface configured for contacting the oil tube;
a seal between the inlet bore and the oil tube; and
an oil recuperation passage defined in the partition wall in fluid communication with the inlet bore between the seal and at least a portion of the contact surface, the oil recuperation passage being in fluid communication with an oil recuperating cavity.

2. The bearing housing according to claim 1 , wherein the seal is a conical sealing surface of the inlet bore.

3. The bearing housing according to claim 1 , wherein the oil recuperation passage comprises a circumferential annular groove radially formed into a surface of the inlet bore.

4. The bearing housing according to claim 3 , wherein the oil recuperation passage comprises at least a first subpassage machined from an outer peripheral surface of the partition wall to the circumferential annular groove and plugged at the outer peripheral surface.

5. The bearing housing according to claim 4 , further comprising a plug weld to plug the first subpassage at the outer peripheral surface.

6. The bearing housing according to claim 4 , wherein the oil recuperation passage comprises at least a second subpassage machined from the outer peripheral surface of the partition wall to the second end and plugged at the outer peripheral surface.

7. The bearing housing according to claim 6 , further comprising a plug weld to plug the second subpassage at the outer peripheral surface.

8. The bearing housing according to claim 1 , wherein the oil recuperation passage comprises at least a subpassage machined from an outer peripheral surface of the body to the second end and plugged at the outer peripheral surface.

9. The bearing housing according to claim 1 , wherein the contact surface of the inlet bore is threading.

10. A gas turbine engine comprising:
a chamber;
an oil lubrication system having at least one oil tube passing through the chamber, the oil tube having an outlet end and threading;
a bearing housing comprising:
a body having a partition wall delimiting the bearing housing from the chamber and defining a bearing housing interior cavity for receiving an oil feed;
an inlet bore in the partition wall in fluid communication with the bearing housing interior cavity, the inlet bore connecting the outlet end of the oil tube to the bearing housing, the inlet bore comprising a contact surface contacting a surface of the outlet end of the oil conduit, and a seal between its surface and the oil tube; and
an oil recuperation passage defined in the partition wall in fluid communication with the inlet bore between the seal and at least a portion of the contact surface;

an oil recuperating cavity in fluid communication with the oil recuperation passage,
wherein, in operation, a negative pressure differential between the oil recuperating cavity and the chamber induces a flow of oil leaked from the bearing housing interior cavity to the oil recuperation passage.

11. The gas turbine engine according to claim 10 , wherein the seal is a conical sealing surface, and an outlet end of the tube having a complementary shape.

12. The gas turbine engine according to claim 10 , wherein the oil recuperation passage comprises a circumferential annular groove radially formed into a surface of the inlet bore.

13. The gas turbine engine according to claim 12 , wherein the oil recuperation passage comprises at least a first subpassage machined in the partition wall from an outer peripheral surface to the circumferential groove and plugged at the outer peripheral surface.

14. The gas turbine engine according to claim 10 , wherein the contact surface of the inlet bore is threading for screwing engagement with threading on the oil tube.

15. The gas turbine engine according to claim 10 , wherein the oil recuperation passage comprises at least a subpassage machined in the partition wall from an outer peripheral surface to the second end and plugged at the outer peripheral surface.

16. A method for recuperating leaked oil in a bearing housing, the method comprising:
directing oil, via an oil tube connected to an inlet bore in a partition wall of the bearing housing, to a bearing housing interior cavity in the bearing housing;
leaking oil in the partition wall at a seal between an end of the oil tube and inlet bore;
recuperating leaked oil in a recuperation passage in the partition wall, between the seal and a contact surface of the oil tube and the inlet bore; and
directing the leaked oil to an oil recuperating cavity.

17. The method according to claim 16 , wherein recuperating and directing the leaked oil to the oil recuperating cavity is induced by a negative pressure differential between the oil recuperating cavity and an exterior of the bearing housing.

18. The method according to claim 16 , wherein recuperating leaked oil in a recuperation passage comprises recuperating the leaked oil in a circumferential annular groove radially formed into a surface of the inlet bore.

19. The method according to claim 16 , wherein leaking oil comprises leaking oil in complementary conical surfaces of the end of the oil tube and the sealing surface of the bearing housing.

Assignees

• Pratt & Whitney Canada

Inventors

• Lefebvre Guy
• Durocher Eric

Classifications

• F01D25/162 Primary

  Bearing supports · CPC title

• F01D25/18 Primary

  Lubricating arrangements (of machines or engines in general F01M) · CPC title

• F05D2220/32

  in gas turbines · CPC title

• F05D2240/55

  Seals · CPC title

• F16C33/6659

  Details of supply of the liquid to the bearing, e.g. passages or nozzles · CPC title