Rolling bearing for refrigerant compressor

Patent metadata

Field	Value
Publication number	US-11067129-B2
Application number	US-201916574239-A
Country	US
Kind code	B2
Filing date	Sep 18, 2019
Priority date	Sep 18, 2019
Publication date	Jul 20, 2021
Grant date	Jul 20, 2021

Abstract

A rolling bearing having an inner raceway and an outer raceway and a plurality of rolling elements arranged therebetween. The rolling bearing is media-lubricated or oil-free lubricated. The lubricant forms an elasto-hydrodynamic lubricant film between the rolling elements and the raceways. At first use of the rolling bearing, at least one surface of the rolling bearing is coated with a protective fluid, preferably an oil-based preservative fluid. Also, a refrigerant compressor having such a rolling bearing.

First claim

What is claimed is:

1. A rolling bearing comprising:
an inner raceway,
an outer raceway, and
a plurality of rolling elements arranged therebetween, wherein the rolling bearing is media-lubricated or oil-free lubricated, wherein
the lubricant forms an elasto-hydrodynamic lubricant film between the rolling elements and the raceways, wherein
at first use of the rolling bearing, at least one surface of the rolling bearing is coated with a protective fluid, and
wherein the protective fluid is a polar substrate with polar heads and non-polar tails, and wherein the polar heads are adapted to bond to the bearing surface and the non-polar tails prevent elements to come into contact with the bearing surface.

2. The rolling bearing according to claim 1 , wherein the protective fluid is water/humidity repellent.

3. The rolling bearing according to claim 1 , wherein the rolling bearing is media-lubricated with pure refrigerant or a refrigerant mixture forming the elasto-hydrodynamic lubricant film.

4. The rolling bearing according to claim 1 , wherein the rolling bearing is lubricated by means of an ultra-thin lubrication film arranged between the rolling elements and the raceways.

5. The rolling bearing according to claim 4 , wherein the ultra-thin lubrication film defines a lubrication film thickness that is less than three hundred nanometers (300 nm).

6. The rolling bearing according to claim 5 , wherein the lubrication film thickness is less than one hundred nanometers (100 nm).

7. The rolling bearing according to claim 5 , wherein the lubrication film thickness is less than thirty nanometers (30 nm).

8. The rolling bearing according to claim 1 , wherein the protective fluid is a preservative fluid with anticorrosion additives.

9. The rolling bearing according to claim 1 , wherein the polar substrate is a detergent, a dispersant or an inhibitor.

10. The rolling bearing according to claim 9 , wherein the protective fluid comprises at least one of overbased sulfonates, amides, imides and Zn-naphentate.

11. The rolling bearing according to claim 1 , wherein at least one rolling element is made from silicon nitride (Si 3 N 4 ).

12. The rolling bearing according to claim 1 , wherein the rolling elements are guided by means of a cage.

13. The rolling bearing according to claim 12 , wherein the cage is made from a fiber-enforced material.

14. The rolling bearing according to claim 12 , wherein the cage is made from glass-fiber-enforced PEEK.

15. The rolling bearing according to claim 12 , wherein the cage is made from carbon fiber-enforced PEEK.

16. The rolling bearing according to claim 1 , wherein the protective fluid is an oil-based preservative fluid.

17. A rolling bearing comprising:
an inner raceway,
an outer raceway, and
a plurality of rolling elements arranged therebetween, wherein the rolling bearing is media-lubricated or oil-free lubricated,
wherein the lubricant forms an elasto-hydrodynamic lubricant film between the rolling elements and the raceways,
wherein at first use of the rolling bearing, at least one surface of the rolling bearing is coated with a protective fluid, and

wherein at least one raceway is made from a hardened corrosion-resistant steel, having a corrosion resistance with a pitting potential of at least 25 mV higher than the stainless steel reference (AISI 440C) according to ASTM G61-86.

18. The rolling bearing according to claim 17 , wherein the protective fluid is a polar substrate with polar heads and non-polar tails, and wherein the polar heads are adapted to bond to the bearing surface and the non-polar tails prevent elements to come into contact with the bearing surface.

19. A media lubricated machine comprising at least one rolling bearing:
an inner raceway,
an outer raceway, and
a plurality of rolling elements arranged therebetween, wherein the rolling bearing is media-lubricated or oil-free lubricated, wherein
the lubricant forms an elasto-hydrodynamic lubricant film between the rolling elements and the raceways, and wherein
at first use of the rolling bearing, at least one surface of the rolling bearing is coated with a protective fluid and
wherein the protective fluid is a polar substrate with polar heads and non-polar tails, and wherein the polar heads are adapted to bond to the bearing surface and the non-polar tails prevent elements to come into contact with the bearing surface.

20. The media lubricated machine according to claim 19 , wherein the protective fluid is an oil-based preservative fluid.

Assignees

• Skf Ab

Inventors

• Wallin Hans
• Hauleitner Rudolf
• Morales Espejel Guillermo Enrique

Classifications

• F16C2223/30

  Coating surfaces · CPC title

• F16C2362/52

  Compressors of refrigerators, e.g. air-conditioners · CPC title

• F16C2204/60

  Ferrous alloys, e.g. steel alloys · CPC title

• F16C19/181

  with angular contact · CPC title

• F16C33/6637

  with liquid lubricant · CPC title