Piston ring and method for manufacturing same

Patent metadata

Field	Value
Publication number	US-2016169387-A1
Application number	US-201414909296-A
Country	US
Kind code	A1
Filing date	Jul 31, 2014
Priority date	Aug 1, 2013
Publication date	Jun 16, 2016
Grant date	—

Abstract

A piston ring for a piston of an internal combustion engine or a compressor may include a substantially annular shaped body defining an inner surface facing towards a groove configured to receive the body, an upper surface facing towards a combustion chamber and extending substantially at a right angle to the inner surface, and a lower surface disposed substantially opposite the upper surface. A layer of thermally insulating coating may be disposed at least partially on at least one of the inner surface, the upper surface and the lower surface.

First claim

1 . A piston ring for a piston of an internal combustion engine or compressor, comprising: a substantially annular shaped body defining an inner surface facing a groove configured to receive the body, an upper surface facing towards a combustion chamber and extending substantially at a right angle to the inner surface, and a lower surface disposed substantially opposite the upper surface, and a layer of thermally insulating coating disposed at least partially on at least one of the inner surface, the upper surface and the lower surface.

2 . The piston ring as claimed in claim 1 , wherein the body includes a gap defining two circumferential free ends, and each of the two free ends having a respective terminal transverse surface, wherein the layer of thermally insulating coating is disposed on at least part of the surface of at least one of the respective terminal transverse surfaces.

3 . The piston ring as claimed in claim 1 , wherein the layer of thermally insulating coating is a ceramic coating.

4 . The piston ring as claimed in claim 3 , wherein the ceramic coating includes stabilized zirconia.

5 . The piston ring as claimed in claim 1 , wherein the layer of thermally insulating coating is a ceramic yttrium stabilized zirconia (YSZ) coating.

6 . A process for manufacturing a piston ring, comprising:
forming a substantially annular shaped body having an inner surface configured to face a piston ring groove, an upper surface facing towards a region of combustion and extending substantially orthogonal to the inner surface, and a lower surface disposed opposite the upper surface relative to the inner surface; and applying a thermally insulating coating to at least part of at least one of the inner surface, the upper surface and the lower surface.

7 . The process as claimed in claim 6 , wherein forming the body includes providing a gap defining two circumferential free ends each having a terminal transverse surface, and further including applying a layer of thermally insulating coating to at least part of the terminal transverse surface of at least one of the two free ends.

8 . The process as claimed in claim 7 , wherein the layer of thermally insulating coating includes a ceramic material.

9 . The process as claimed in claim 8 , wherein the ceramic material includes stabilized zirconia.

10 . The process as claimed in claim 8 , wherein the ceramic material includes yttrium stabilized zirconia (YSZ).

11 . The process as claimed in claim 6 , wherein the thermally insulating coating includes a ceramic material.

12 . The process as claimed in claim 11 , wherein the ceramic material includes stabilized zirconia.

13 . The process as claimed in claim 11 , wherein the ceramic material includes yttrium stabilized zirconia (YSZ).

14 . The piston ring as claimed in claim 1 , wherein the layer of thermally insulating coating is a ceramic material including at least one of stabilized zirconia and yttrium stabilized zirconia (YSZ).

15 . The piston ring as claimed in claim 2 , wherein the layer of thermally insulating coating includes a ceramic material.

16 . The piston ring as claimed in claim 15 , wherein the ceramic material includes stabilized zirconia.

17 . The piston ring as claimed in claim 15 , wherein the ceramic coating includes yttrium stabilized zirconia (YSZ).

18 . A piston ring for a piston of an internal combustion engine or compressor, comprising:
an annular body having an inner surface configured to face a piston ring groove, an upper surface facing towards a combustion chamber and extending transversely to the inner surface, and a lower surface disposed opposite the upper surface relative to the inner surface; and a coating layer of a ceramic material disposed at least partially on at least one of the inner surface, the upper surface and the lower surface.

19 . The piston ring as claimed in claim 18 , wherein the ceramic material includes at least one of stabilized zirconia and yttrium stabilized zirconia.

20 . The piston ring as claimed in claim 18 , wherein the body includes a gap defining two circumferential free ends each having a terminal transverse surface, and wherein the coating layer of ceramic material is further disposed on the terminal transverse surface of one of the two free ends.

Assignees

• Mahle Metal Leve Sa
• Mahle Int Gmbh

Inventors

• Meirelles Tomanik Antonio E
• Lopez Daniel

Classifications

• F16J9/26 Primary

  characterised by the use of particular materials · CPC title

• F16J9/28

  of non-metals · CPC title

• C23C30/005

  on hard metal substrates · CPC title

• F16J9/12

  Details · CPC title

• F16J9/14

  Joint-closures · CPC title