Granted Patent B2

US 12,270,355 · App. 18/334,455 · Granted Apr 8, 2025

Inventors: Daniel J. Mohr (Columbus, IN); Robert Earl Hoye (Columbus, IN); Timothy Shipp (Seymour, IN); Leonard W. Brancamp (Columbus, IN)

Assignee: Cummins Inc.

F02F1/24F01L3/04F02F3/14

Abstract

Claims (31)

1. An apparatus for a combustion cylinder of a reciprocating piston engine, the apparatus comprising:

a combustion cylinder end face component including a first side configured to face the combustion cylinder and extending in a radial direction of the combustion cylinder and a pocket recessed into the first side and including a recessed pocket surface, the combustion cylinder end face component being one of a piston and a cylinder head; and

a thermal barrier coating inlaid in the pocket, the thermal barrier coating comprising a ceramic-metallic layer directly coating the recessed pocket surface and a ceramic layer directly coating the ceramic-metallic layer and including an outer surface facing the combustion cylinder, the thermal barrier coating filling the pocket to define a planar surface including at least a portion of the first side and the thermal barrier coating.

2. The apparatus of claim 1 , wherein the combustion cylinder end face component is the cylinder head.

3. The apparatus of claim 2 , wherein the outer surface of the ceramic layer has a roughness equal to or less than a roughness of a surface of the first side of the cylinder head.

4. The apparatus of claim 2 , wherein a diameter of the pocket in the radial direction is equal to a diameter of the combustion cylinder.

5. The apparatus of claim 2 , wherein the ceramic-metallic layer has an average thickens of 125 μm+/−20%.

6. The apparatus of claim 2 , wherein the ceramic layer has an average thickens of 350 μm+/−20%.

7. The apparatus of claim 2 , comprising a valve including an outer valve face configured to face the combustion cylinder and being covered with the thermal barrier coating.

8. The apparatus of claim 2 , wherein the thermal barrier coating is the only thermal barrier coating of the cylinder head.

9. The apparatus of claim 2 , wherein the outer surface of the thermal barrier coating is co-planar with a plane bounding the first side of the cylinder head.

10. The apparatus of claim 1 , wherein the thermal barrier coating consists essentially of the ceramic-metallic layer and the ceramic layer.

11. The apparatus of claim 1 , wherein the combustion cylinder end face component is the piston.

12. The apparatus of claim 11 , wherein the first side of the piston includes a centrally positioned piston bowl and a crown positioned radially outward from the centrally positioned piston bowl, and the pocket is recessed into the crown.

13. The apparatus of claim 12 , wherein the pocket is defined intermediate a radially outer annular portion of the crown and a radially inner annular portion of the crown.

14. A reciprocating piston engine comprising:

a cylinder head located at a first end of a combustion cylinder, the cylinder head including:

a first side oriented toward the combustion cylinder,

a first pocket recessed into the first side, and

a first thermal barrier coating inlaid in the first pocket and including a first outer surface facing the combustion cylinder; and

a piston located at a second end of the combustion cylinder, the piston including:

a second side oriented toward the combustion cylinder and including a centrally positioned piston bowl and a crown positioned radially outward from the centrally positioned piston bowl,

a second pocket recessed into the crown of the second side, and

a second thermal barrier coating inlaid in the second pocket and including a second outer surface facing the combustion cylinder,

wherein at least one of: (a) the first thermal barrier coating fills the first pocket to provide a first planar surface including at least a portion of the first side and the first thermal barrier coating, and (b) the second thermal barrier coating fills the second pocket to provide a second planar surface including at least a portion of the second side and the second thermal barrier coating.

15. The reciprocating piston engine of claim 14 , wherein the first thermal barrier coating comprises a first ceramic-metallic layer directly coating a recessed surface of the first pocket and a first ceramic layer directly coating the first ceramic-metallic layer and including the first outer surface.

16. The reciprocating piston engine of claim 14 , wherein the second thermal barrier coating comprises a second ceramic-metallic layer directly coating a recessed surface of the second pocket and a second ceramic layer directly coating the second ceramic-metallic layer and including the second outer surface.

17. The reciprocating piston engine of claim 14 , wherein the second pocket is positioned intermediate a radially outer annular base metal portion of the crown and a radially inner annular base metal portion of the crown.

18. The reciprocating piston engine of claim 14 , comprising: a valve located at a port defined in the cylinder head, the valve including a third side facing the combustion cylinder and a third thermal barrier coating directly coating the third side and including a third outer surface oriented to face the combustion cylinder.

19. The reciprocating piston engine of claim 18 , wherein the third thermal barrier coating comprises a third ceramic-metallic layer directly coating the third side and a third ceramic layer directly coating the third ceramic-metallic layer and including a third outer surface facing the combustion cylinder.

20. The reciprocating piston engine of claim 18 , wherein the first thermal barrier, the second thermal barrier, and the third thermal barrier are the only thermal barrier portions of the cylinder head, the piston and the valve.

Assignments (2)

Continuity (3)

References Cited (25)