Rolling bearing and method of manufacturing same

Patent metadata

Field	Value
Publication number	US-2025034412-A1
Application number	US-202418767050-A
Country	US
Kind code	A1
Filing date	Jul 9, 2024
Priority date	Jul 26, 2023
Publication date	Jan 30, 2025
Grant date	—

Abstract

A rolling bearing includes an outer ring having an outer surface configured to be fitted into a first component, an inner ring having an inner surface configured to be fitted onto a second component, at least one rolling element arranged between the outer ring and the inner ring, and an antimony-free composite coating on the outer surface of the outer ring and/or the inner surface of the inner ring. The antimony-free composite comprises a binder and polytetrafluorethylene as a solid lubricant.

First claim

What is claimed is:

1 . A rolling bearing comprising:
an outer ring having an outer surface configured to be fitted into a first component, an inner ring having an inner surface configured to be fitted onto a second component, at least one rolling element arranged between the outer ring and the inner ring, and an antimony-free composite coating on the outer surface of the outer ring and/or the inner surface of the inner ring, wherein the antimony-free composite comprises a binder and polytetrafluorethylene as a solid lubricant.

2 . The rolling bearing according to claim 1 , wherein the antimony-free composite includes up to 30 wt % polytetrafluorethylene.

3 . The rolling bearing according to claim 1 , wherein the antimony-free composite includes up to 5 wt % polytetrafluorethylene.

4 . The rolling bearing according to claim 1 ,
wherein the composite coating has a thickness of 2 to 70 μm.

5 . The rolling bearing according to claim 1 ,
wherein the composite coating has a thickness of 10 to 30 μm.

6 . The rolling bearing according to claim 1 ,
wherein the binder is polyamide-imide, epoxy, acrylic and/or polybutyl titanate.

7 . The rolling bearing according to claim 1 ,
wherein a particle size of the polytetrafluorethylene is from 0.1 to 15 μm.

8 . The rolling bearing according to claim 1 ,
wherein a particle size of the polytetrafluorethylene is from 0.5 to 5 μm.

9 . The rolling bearing according to claim 1 ,
wherein the composite coating has a porosity of 2 to 50 vol % and a pore size of 2 to 50 μm.

10 . The rolling bearing according to claim 1 ,
wherein the composite coating has a porosity of 5 to 25 vol %, and a pore size of 5 to 25 μm.

11 . The rolling bearing according to claim 1 ,
wherein a surface of the outer surface of the outer ring and/or the inner surface of the inner ring has a surface roughness Ra of 0.5 to 10 μm before the composite coating is applied.

12 . The rolling bearing according to claim 1 ,
wherein a surface of the outer surface of the outer ring and/or the inner surface of the inner ring has a surface roughness Ra of 1 to 3 μm before the composite coating is applied.

13 . The rolling bearing according to claim 1 ,
wherein the outer surface of the outer ring and/or the inner surface of the inner ring has a phosphate bond layer having a thickness of 1 to 7 μm.

14 . The rolling bearing according to claim 1 ,
wherein the outer surface of the outer ring and/or the inner surface of the inner ring has a phosphate bond layer having a thickness of 2 to 4 μm.

15 . The rolling bearing according to claim 1 ,
wherein a friction coefficient of the composite coating in dry contact against an aluminum alloy is from 0.05 to 0.32.

16 . The rolling bearing according to claim 1 ,
wherein the composite coating has a dielectric strength greater than 10 kv/mm and a dielectric constant of lower than 6.

17 . The rolling bearing according to claim 1 ,
wherein the antimony-free composite includes up to 5 wt % polytetrafluorethylene, wherein the composite coating has a thickness of 10 to 30 μm, and wherein the binder is polyamide-imide, epoxy, acrylic and/or polybutyl titanate.

18 . An assembly comprising:
a rolling bearing according to claim 1 , wherein the outer ring is fitted into the first component, and wherein the inner ring is mounted on the second component.

19 . A method for manufacturing a rolling bearing
providing an outer ring having an outer surface configured to be fitted into a first component, providing an inner ring having an inner surface configured to be fitted onto a second component, providing at least one rolling element arranged between the outer ring and the inner ring,
providing an antimony-free composite coating comprising a binder and polytetrafluorethylene as a solid lubricant, and
applying the composite coating on the outer surface of the outer ring and/or the inner surface of the inner ring by spraying, brushing and/or dipping.

20 . The method according to claim 19 ,
further including curing the composite coating at temperature of 22° C. to 130° C.

Assignees

• Skf Ab

Inventors

• Zhou Xiaobo
• Nijdam Thijs
• Vierling Andreas
• Henninger Frank
• Shen Bo
• Cao Lijun
• Brizmer Victor
• Chen Yafen
• An Hongyuan

Classifications

• C09D7/65 Primary

  macromolecular (C09D7/41-C09D7/48 take precedence) · CPC title

• F16C33/6696 Primary

  with solids as lubricant, e.g. dry coatings, powder · CPC title

• C10N2050/14

  Composite materials or sliding materials in which lubricants are integrally molded · CPC title

• C10N2080/00

  Special pretreatment of the material to be lubricated, e.g. phosphatising or chromatising of a metal · CPC title

• F16C2208/32

  Polytetrafluorethylene [PTFE] (F16C2208/58 takes precedence) · CPC title