Generator bearing assembly and a method for lubricating a generator bearing assembly

Patent metadata

Field	Value
Publication number	US-9835200-B2
Application number	US-201514687105-A
Country	US
Kind code	B2
Filing date	Apr 15, 2015
Priority date	Apr 15, 2015
Publication date	Dec 5, 2017
Grant date	Dec 5, 2017

Abstract

A method for lubricating a generator bearing assembly is presented. The generator bearing assembly has a bearing and a bearing seat that supports the bearing. A coating of a lubricating material is applied at an interfacing surface between the bearing and the bearing seat. A curing process is performed to the coating by heating the coating up to a predefined curing temperature.

First claim

What is claimed is:

1. A method for aligning between a bearing and a bearing seat of a generator bearing assembly comprising:
applying a coating of a lubricating material on an interfacing surface between the bearing and the bearing seat, the interfacing surface comprising a concave shape surface portion and a convex shape surface portion of the bearing seat and a convex shape surface portion and a concave shape surface portion of the bearing, the concave shape surface portion of the bearing seat mating with the convex shape surface portion of the bearing and the convex shape surface portion of the bearing seat mating with the concave shape surface portion of the bearing;
performing a curing process to the coating by heating the coating up to a predefined curing temperature; and
supporting the bearing on the lubricated concave shape surface portion of the bearing seat and on the lubricated convex shape surface portion of the bearing seat,
wherein the lubricated concave shape surface portion and the lubricated convex shape surface portion of the bearing seat resolve a shift of a load distribution introduced by weight of the bearing during an operation of the generator to resolve a titling between the bearing and the bearing seat.

2. The method according to claim 1 , wherein the lubricating material comprises Polytetrafluoroethylene.

3. The method according to claim 1 , wherein the application of the coating comprises:
spraying the lubricating material over the interfacing surface,
drying the coating,
measuring a thickness of the coating, and
repeating the application of the coating until the thickness of the coating is within a predefined thickness range.

4. The method as claimed in claim 3 , wherein the predefined thickness range is 0.025±0.0010 mm.

5. The method according to claim 1 , wherein the curing process comprises:
heating the coating to the predefined curing temperature,
maintaining the predefined curing temperature at the coating for a predefined period of time,
cooling the coating,
performing a curing test, and
repeating the curing process until the coating passes the curing test.

6. The method according to claim 1 , wherein the predefined curing temperature is in a range of 170° C. to 185° C.

7. The method according to claim 1 , wherein the curing process is carried out by a portable furnace.

8. The method as claimed in claim 7 , further comprising performing a trial curing run on a non-coated test part to obtain a curing setup of the portable furnace, wherein the curing process is carried out by the portable furnace according to the curing setup of the portable furnace.

9. The method as claimed in claim 8 , wherein the curing setup of the portable furnace comprises a distance of the portable furnace above a surface of the non-coated test part.

10. The method as claimed in claim 8 , wherein the curing setup of the portable furnace comprises a temperature of the portable furnace for applying heat to a surface of the non-coated test part.

11. The method according to claim 1 , wherein the curing process is carried out by a heat gun.

12. A generator bearing assembly comprising:
a bearing; and
a bearing seat that supports the bearing on an interfacing surface between the bearing and the bearing seat,
wherein a coating of a lubricating material is applied on the interfacing surface,
wherein a curing process is performed to the coating by heating the coating up to a predefined curing temperature,
wherein the interfacing surface comprises a concave shape surface portion and a convex shape surface portion of the bearing seat and a convex shape surface portion and a concave shape surface portion of the bearing,
wherein the concave shape surface portion of the bearing seat mates with the convex shape surface portion of the bearing and the convex shape surface portion of the bearing seat mates with the concave shape surface portion of the bearing,
wherein the lubricated concave shape surface portion and the lubricated convex shape surface portion of the bearing seat resolve a shift of a load distribution introduced by weight of the bearing during an operation of the generator to resolve a titling between the bearing and the bearing seat.

13. The generator bearing assembly according to claim 12 , wherein the lubricating material comprises Polytetrafluoroethylene.

14. The generator bearing assembly according to claim 12 , wherein the application of the coating comprises:
spraying the lubricating material over the interfacing surface,
drying the coating,
measuring a thickness of the coating, and
repeating the application of the coating until the thickness of the coating is within a predefined thickness range.

15. The generator bearing assembly according to claim 12 , wherein the curing process comprises:
heating the coating to the predefined curing temperature,
maintaining the predefined curing temperature at the coating for a predefined period of time,
cooling the coating,
performing a curing test, and
repeating the curing process until the coating passes the curing test.

16. The generator bearing assembly according to claim 12 , wherein the predefined curing temperature is in a range of 170° C. to 185° C.

Assignees

• Siemens Energy Inc

Inventors

• Allen David Thomas

Classifications

• F16C2240/06

  Temperature · CPC title

• F16C2380/26

  Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators · CPC title

• F16C2240/60

  Thickness, e.g. thickness of coatings · CPC title

• F16C33/208 Primary

  Methods of manufacture, e.g. shaping, applying coatings · CPC title

• F16C23/045

  for radial load mainly, e.g. radial spherical plain bearings · CPC title