Sliding combination for use in an internal combustion engine

Patent metadata

Field	Value
Publication number	US-2016305366-A1
Application number	US-201415101354-A
Country	US
Kind code	A1
Filing date	Nov 21, 2014
Priority date	Dec 3, 2013
Publication date	Oct 20, 2016
Grant date	—

Abstract

A sliding combination for use in an internal combustion engine may include at least one cylinder liner defining an internal sliding surface and a ring having an external lateral sliding surface. The external sliding surface of the ring may slide in relation to the internal sliding surface of the liner. The external sliding surface of the ring may include a first coating of a physical vapour deposited metal nitride in sliding contact with a second coating of a diamond-like carbon (DLC) material disposed on the internal sliding surface of the liner.

First claim

1 . A sliding combination for use in an internal combustion engine, comprising: at least one cylinder liner of cylindrical shape defining an internal sliding surface and a ring having at least one external lateral sliding surface, the at least one external sliding surface of the ring sliding in relation to the internal sliding surface of the at least one liner, wherein the at least one external sliding surface of the ring includes a first coating of a physical vapour deposited metal nitride in sliding contact with a second coating of diamond-like carbon (DLC) disposed on the internal sliding surface of the at least one liner.

2 . The sliding combination according to claim 1 , wherein the first coating disposed on the ring is preferably composed includes one or more of CrN, CrCN/C and TiN.

3 . The sliding combination according to claim 2 , wherein the first coating disposed on the ring is composed of CrN.

4 . The sliding combination according to claim 1 , wherein the first coating disposed on the ring has a hardness of between 1000 HV and 2300 HV, a thickness greater than 5 μm, and a columnar morphology.

5 . The sliding combination according to claim 1 , wherein the second coating disposed on the at least one liner has a hardness of between 10 GPa and 20 GPa, a thickness greater than 1 μm, and a gradient morphology.

6 . The sliding combination according to claim 1 , wherein the ring has a base composed of stainless steel or cast iron.

7 . The sliding combination according to claim 1 , wherein the at least one liner has a metal base.

8 . The sliding combination according to claim 7 , wherein the metal base of the at least one liner is composed of cast iron.

9 . The sliding combination according to claim 7 , wherein the metal base of the at least one liner is composed of aluminium alloy.

10 . The sliding combination according to claim 1 , wherein the first coating has a columnar morphology.

11 . The sliding combination according to claim 10 , wherein the second coating has a gradient morphology.

12 . The sliding combination according to claim 1 , wherein the second coating has a hardness ranging from 10 GPa to 20 GPa and a gradient morphology.

13 . The sliding combination according to claim 3 , wherein the first coating has a hardness ranging from 1000 HV to 2300 HV and a columnar morphology.

14 . The sliding combination according to claim 4 , wherein the thickness of the first coating ranges from 20 μm to 40 μm.

15 . The sliding combination according to claim 4 , wherein the ring has a base composed of stainless steel.

16 . The sliding combination according to claim 4 , wherein the ring has a base composed of cast iron.

17 . The sliding combination according to claim 5 , wherein the thickness of the second coating ranges from 2 μm to 15 μm.

18 . The sliding combination according to claim 5 , wherein the at least one liner has a metal base composed of cast iron or aluminium alloy.

19 . A sliding combination of an internal combustion engine, comprising:
a cylinder liner having a cylindrical shape and defining an internal sliding surface; a ring having an external lateral sliding surface for sliding relative to the internal sliding surface of the cylinder liner; a first coating of a physical vapour deposited metal nitride disposed on the external sliding surface of the ring; a second coating of a diamond-like carbon (DLC) material disposed on the internal sliding surface of the cylinder liner, the second coating in sliding contact with the first coating; and wherein the first coating has a hardness ranging from 1000 HV to 2300 HV and a columnar morphology, and the second coating has a hardness ranging from 10 GPa to 20 GPa and a gradient morphology.

20 . The sliding combination according to claim 19 , wherein the physical vapour deposited metal nitride of the first coating has a composition including at least one of CrN, CrCN/C, and TiN.

Assignees

• Mahle Metal Leve Sa
• Mahle Int Gmbh

Inventors

• Da Rocha Mordente Paulo Jose
• Deschauer Rejowski Edney
• Banfield Robert Richard
• Valentim Lima Sarabanda Jose

Classifications

• C23C14/0605

  Carbon · CPC title

• F02F1/004

  Cylinder liners (F02F1/08, F02F1/16 take precedence) · CPC title

• F16J9/26 Primary

  characterised by the use of particular materials · CPC title

• F02F11/005 Primary

  involving cylinder liners · CPC title