# US 11,078,960 B2 · Rolling contact bearing with improved performances

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- Number: US 11,078,960 B2
- Document ID: US11078960B2
- Status: Granted
- Kind: B2
- Application number: 16/736,132
- Filed: 2020-01-07
- Published: 2020-07-09
- Granted: 2021-08-03
- Earliest claimed: 2019-01-09
- Assignees: Aktiebolaget Skf
- Applicants: Aktiebolaget SKF
- Inventors: Victor Brizmer; Francesco Lamboglia; Ralph Meeuwenoord; Hubertus Laurentius Maria Peek
- Web page: https://patentgrep.com/patent/US11078960B2

## CPC

- F16C 33/585: {of raceways, e.g. ribs to guide the rollers}
- F16C 33/586: {outside the space between the races, e.g. end faces or bore of inner ring}
- F16C 33/6614: {in recesses or cavities provided in retainers, races or rolling elements}
- F16C 19/00: Bearings with rolling contact, for exclusively rotary movement (adjustable bearings F16C23/00, F16C25/00 {; electrically insulating bearings H02K5/173})
- F16C 2240/54: Surface roughness
- F16C 2326/02: Wheel hubs or castors
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS

## Abstract

A rolling contact bearing, wherein the surface of the raceways of an outer member and/or an inner member are randomly formed with an innumerable number of microconcavelike pits, the surfaces are provided with said pits having a surface roughness value smaller than 0.25 microns and a skewness Rsk value such that −3.5<Rsk<−1.0.

## Claims

### Claim 1

A rolling contact bearing, comprising
an outer member;
an inner member; and
at least one raceway on the outer member or the inner member, wherein a surface of the at least one raceway is a microroughened surface having a skewness (Rsk) value such that −3.5<Rsk<−1.5 and a surface roughness value (Ra) less than 0.1 microns.

### Claim 2

A rolling contact bearing, comprising
an outer member;
an inner member; and
at least one raceway on the outer member or the inner member, wherein a surface of the at least one raceway is a microroughened surface having a skewness (Rsk) value such that −3.5<Rsk<−1.0 and a surface roughness value (Ra) less than 0.1 microns.

### Claim 3 (depends on 2)

The rolling contact bearing of claim 2, wherein the microroughed surface comprises a plurality of microconcave pits.