Piston assembly for a reciprocating engine

Patent metadata

Field	Value
Publication number	US-9845765-B2
Application number	US-201514595013-A
Country	US
Kind code	B2
Filing date	Jan 12, 2015
Priority date	Jan 12, 2015
Publication date	Dec 19, 2017
Grant date	Dec 19, 2017

Abstract

A power cylinder system for a reciprocating engine includes a steel piston configured to move within a cylinder of the reciprocating engine. The system also includes a groove extending circumferentially about the piston beneath a top land of the piston and configured to support a ring having an inner circumferential face. One or more channels are formed in the top land and are configured to facilitate transfer of combustion gases to a space between a portion of the groove and the inner circumferential face of the ring.

First claim

The invention claimed is:

1. A power cylinder system for a reciprocating engine, comprising:
a steel piston comprising a diameter greater than ten centimeters and configured to move within a cylinder of the reciprocating engine configured to operate at a maximum revolutions per minute (RPM) of approximately 1800 RPM;
a groove extending circumferentially about the steel piston beneath a top land of the steel piston and configured to support a ring having an inner circumferential face; and
one or more channels formed in the top land and configured to facilitate transfer of combustion gases to a space between a portion of the groove and the inner circumferential face of the ring,
wherein at least one of the one or more channels comprises a curved cross-sectional shape.

2. The power cylinder system of claim 1 , wherein the steel piston is configured to have a maximum mean piston speed less than eighteen meters per second.

3. The power cylinder system of claim 1 , wherein the one or more channels comprise a radius greater than one millimeter.

4. The power cylinder system of claim 1 , wherein the one or more channels extend radially in an axially-facing upper surface of the groove.

5. A system, comprising:
a power cylinder system for a reciprocating engine, comprising:
a piston comprising a diameter greater than ten centimeters and configured to move within a cylinder of the reciprocating engine with a maximum mean piston speed of less than approximately eighteen meters per second;
a groove extending circumferentially about the piston beneath a top land of the piston;
a ring disposed within the groove; and
one or more channels formed in an axially upper surface of the groove or an upper face of the ring, wherein the one or more channels are configured to facilitate transfer of combustion gases to a space between a portion of the groove and an inner circumferential face of the ring,
wherein at least one of the one or more channels comprises a curved cross-sectional shape.

6. The system of claim 5 , wherein the piston is a steel piston.

7. The system of claim 5 , wherein the piston is an aluminum piston and the groove comprises a protective ring insert configured to support the ring.

8. The system of claim 7 , wherein the protective ring insert comprises a Ni-resist ring insert.

9. The system of claim 7 , wherein the one or more channels are formed within the protective ring insert of the groove.

10. The system of claim 5 , wherein the one or more channels comprise a radius greater than one millimeter.

11. The system of claim 5 , comprising the reciprocating engine configured to operate with the maximum mean piston speed of less than approximately eighteen meters per second.

12. The system of claim 11 , wherein the reciprocating engine comprises an industrial power-generating engine and is configured to remain stationary relative to a ground during operation.

13. A method of operating a reciprocating engine, comprising:
operating the reciprocating engine with a maximum mean piston speed of less than approximately eighteen meters per second, wherein the reciprocating engine comprises a piston comprising a diameter greater than ten centimeters and configured to move within a cylinder of the reciprocating engine; and
transferring combustion gases through one or more channels to a space between a portion of a groove extending circumferentially about the piston beneath a top land of the piston and an inner circumferential face of a ring disposed within the groove, wherein the one or more channels are formed in an axially upper surface of the groove or an upper face of the ring,
wherein at least one of the one or more channels comprises a curved cross-sectional shape.

14. The method of claim 13 , wherein the piston is a steel piston.

15. The method of claim 13 , wherein the piston is an aluminum piston and the groove comprises a protective ring insert configured to support the ring, and wherein the one or more channels are formed within the protective ring insert of the groove.

16. The method of claim 13 , comprising operating the reciprocating engine at a maximum revolutions per minute (RPM) of approximately 1800 RPM.

Assignees

• Gen Electric

Inventors

• Donahue Richard John
• Zimmerman Daniel David

Classifications

• F02F3/0092 Primary

  the material being steel-plate · CPC title

• F02F3/0084 Primary

  the pistons being constructed from specific materials · CPC title

• F02F3/08

  the inserts being ring-shaped · CPC title

• F16J9/08

  with expansion obtained by pressure of the medium · CPC title

• F02F3/24

  having means for guiding gases in cylinders, e.g. for guiding scavenging charge in two-stroke engines · CPC title