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US 2021/0079953 A1Published application
Rolling bearing, particularly hybrid rolling bearing for refrigerant compressor
AssigneeAktiebolaget Skf
InventorsHans Wallin, Rudolf Hauleitner, Guillermo Enrique Morales Espejel
Life of this patent
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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.
Claims20
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.
4 more elements
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 1, wherein the protective fluid is a preservative fluid with anticorrosion additives.
6:
- The rolling bearing according to claim 8, 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.
7:
- The rolling bearing according to claim 1, wherein the polar substrate is a detergent, a dispersant or an inhibitor.
8:
- 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.
4 more elements
9:
- The rolling bearing according to claim 1, wherein at least one rolling element is made from silicon nitride (Si3N4).
10:
- The rolling bearing according to claim 1, wherein the rolling elements are guided by means of a cage.
11:
- 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.
4 more elements
12:
- The rolling bearing according to claim 1, wherein the protective fluid is an oil-based preservative fluid.
13:
- 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).
14:
- The rolling bearing according to claim 13, wherein the lubrication film thickness is less than one hundred nanometers (100 nm).
15:
- The rolling bearing according to claim 13, wherein the lubrication film thickness is less than thirty nanometers (30 nm).
16:
- The rolling bearing according to claim 7, wherein the protective fluid comprises at least one of overbased sulfonates, amides, imides and Zn-naphentate.
17:
- The rolling bearing according to claim 10, wherein the cage is made from a fiber-enforced material.
18:
- The rolling bearing according to claim 10, wherein the cage is made from glass-fiber-enforced PEEK.
19:
- The rolling bearing according to claim 10, wherein the cage is made from carbon fiber-enforced PEEK.
20:
- The media lubricated machine according to claim 11, wherein the protective fluid is an oil-based preservative fluid.