Sliding bearing

Patent metadata

Field	Value
Publication number	US-9562565-B2
Application number	US-201314400250-A
Country	US
Kind code	B2
Filing date	May 9, 2013
Priority date	May 11, 2012
Publication date	Feb 7, 2017
Grant date	Feb 7, 2017

Abstract

A sliding bearing for an internal combustion engine having a plastics polymer-based composite layer on a substrate, the composite layer comprising: a matrix of plastics polymer-based material having distributed throughout the matrix; 0.1 to 5% vol carbon nanostructures; and incidental impurities; and a method of manufacture of such a sliding bearing.

First claim

The invention claimed is:

1. A sliding bearing for an internal combustion engine, comprising:
a plastics polymer-based composite layer on a substrate, the composite layer including:
a matrix of plastics polymer-based material having distributed throughout the matrix:
0.1 to 5% vol carbon nanostructures; and
incidental impurities;

wherein the carbon nanostructures are functionalised carbon nanostructures, wherein the functionalised carbon nanostructures have a structural unit including one or more of an acid side chain, an acyl side chain, an amine/amide side chain, a fluorinated side chain, and an oxidised side chain; and
wherein the matrix of plastics polymer-based material is a polyimide/amide resin.

2. The sliding bearing according to claim 1 , wherein the carbon nanostructures comprise carbon nanotubes.

3. The sliding bearing according to claim 2 , wherein the carbon nanotubes are 0.5 to 50 nm in diameter.

4. The sliding bearing according to claim 3 , wherein the nanotubes are at least 100 times longer than their diameter.

5. The sliding bearing according to claim 2 , wherein the nanotubes are 1 to 40 μm long.

6. The sliding bearing according to claim 1 , wherein the carbon nanostructures comprise ball-shaped carbon nanostructures.

7. The sliding bearing according to claim 1 , wherein the carbon nanostructures comprise ellipsoidal carbon nanostructures.

8. The sliding bearing according to claim 1 , wherein the matrix has 0.5 to 3% vol carbon nanostructures.

9. The sliding bearing according to claim 1 , wherein the composite layer further includes from 0.5 to 15% vol of a fluoropolymer particulate.

10. The sliding bearing according to claim 1 , wherein the composite layer further includes a metal powder composition of 0.5 to less than 15% vol.

11. The sliding bearing according to claim 1 , wherein the matrix of the polyimide/amide resin includes distributed throughout the matrix: from 0.5 to less than 15% vol of a metal powder; from 0.5 to 15% vol of a fluoropolymer particulate, the balance being polyimide/amide resin apart from incidental impurities.

12. The sliding bearing according to claim 11 , wherein the matrix includes 12.5% vol of Al powder, 5.7% vol of PTFE particulate, 4.8% vol of silane powder, <0.1% vol other components, and a balance of polyimide/amide.

13. The sliding bearing according to claim 1 , wherein the composite layer includes 0.5 to 10% vol of inorganic particulate.

14. The sliding bearing according to claim 13 , wherein the particulate is selected from the group consisting of: TiCN, SiC, NbC, Si 3 N 4 , Al 2 O 3 , TiN, B 4 C, BN and talc.

15. The sliding bearing according to claim 1 , wherein the substrate comprises a backing material layer and the composite layer is provided on the backing material layer.

16. The sliding bearing according to claim 1 , wherein the substrate comprises a steel, copper-based or aluminum-based backing material layer and a metallic bearing material layer and the composite layer is provided on the metallic bearing material layer.

17. The sliding bearing according to claim 1 , wherein the substrate comprises a non-sputter coated metallic base layer and the composite layer is bonded to the non-sputter coated metallic base layer by a sputter-coated Al-based intermediate layer.

18. The sliding bearing according to claim 1 , wherein the composite layer has a thickness of 6 to 12 μm.

19. The sliding bearing according to claim 1 , wherein the sliding bearing is at least one of a half bearing shell, a thrust washer and a bearing bush.

20. A flat sheet element for forming a sliding bearing for an internal combustion engine according to claim 1 .

21. A method of manufacturing a sliding bearing for an internal combustion engine having a plastics polymer-based composite layer on a substrate, the composite layer including:
a matrix of plastics polymer-based material having distributed throughout the matrix:
0.1 to 5% vol carbon nanostructures; and
incidental impurities,

the method comprising the steps of:
making a mixture including a plastics polymer-based resin material and carbon nanostructures, wherein the plastics polymer-based resin material includes a polyimide/amide resin and the carbon nanostructures are functionalised carbon nanostructures;
coating the mixture onto a substrate; and
treating the mixture so as to consolidate the plastics polymer-based resin material to form the composite layer;
wherein the functionalised carbon nanostructures have a structural unit selected from at least the following group: an acid side chain, an acyl side chain, an amine/amide side chain, a fluorinated side chain, and an oxidised side chain.

22. The method according to claim 21 , wherein
the mixture of plastics polymer-based resin material and carbon nanostructures includes a solvent, and
wherein treating the mixture includes heating the mixture to a predetermined temperature for a predetermined duration.

23. The method according to claim 21 , wherein the step of coating includes at least one of spraying and printing.

24. The method according to claim 21 , wherein:
the mixture of plastics polymer-based resin material and carbon nanostructures further includes a concentration of 0.5 to less than 15% vol of a metal powder, 0.5 to 15% vol of a fluoropolymer particulate, and 3 to 6% vol of a silane material, the balancing being the polyimide/amide resin apart from incidental impurities.

Assignees

• Mahle Int Gmbh
• Mahle Engine Systems Us Ltd
• Mahle Engine Systems Uk Ltd

Inventors

• Kachoosangi Roohollah

Classifications

• F16C33/201 Primary

  Composition of the plastic · CPC title

• F16C33/125

  Details of bearing layers, i.e. the lining · CPC title

• F16C33/124

  Details of overlays · CPC title

• F16C33/208

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

• F16C33/046

  divided or split, e.g. half-bearings or rolled sleeves · CPC title