Prechamber assembly for internal combustion engine

Patent metadata

Field	Value
Publication number	US-10337396-B2
Application number	US-201615374297-A
Country	US
Kind code	B2
Filing date	Dec 9, 2016
Priority date	Dec 14, 2015
Publication date	Jul 2, 2019
Grant date	Jul 2, 2019

Abstract

A prechamber assembly for an internal combustion engine is disclosed. The prechamber assembly may have a prechamber housing with a first prechamber housing portion and a second prechamber housing portion. The first prechamber housing portion and the second prechamber housing portion may define a prechamber volume. The prechamber assembly may also have a cooling system. The cooling system may be configured to cool at least one of the first prechamber housing portion and the second prechamber housing portion based on a flow of a cooling fluid through the cooling system. The cooling system may have at least one cooling channel formed within the prechamber housing.

First claim

What is claimed is:

1. A prechamber assembly for an internal combustion engine, the prechamber assembly comprising:
a prechamber housing with a first prechamber housing portion and a second prechamber housing portion, wherein the first prechamber housing portion and the second prechamber housing portion define a prechamber volume therein,
a prechamber housing wall being defined between an internal surface of the prechamber housing and an external surface of the prechamber housing,
the prechamber housing wall defining a plurality of passages therethrough, each passage of the plurality of passages extending from a passage inlet defined by the internal surface of the prechamber housing to a passage outlet defined by the external surface of the prechamber housing, the prechamber volume being in fluid communication with the external surface of the prechamber housing and a main combustion chamber of the internal combustion engine via each passage; and
a cooling system configured to cool at least one of the first prechamber housing portion and the second prechamber housing portion, based on a flow of a cooling fluid through the cooling system, the cooling system comprising at least one cooling channel defined within the wall of the prechamber housing,
the at least one cooling channel including a loop portion that at least partially surrounds one passage of the plurality of passages about a circumferential direction of the one passage, the circumferential direction of each passage extending circumferentially about a flow direction through each passage,
the loop portion being configured to cool the one passage based on the flow of the cooling fluid through the cooling system,
wherein the at least one cooling channel includes a plurality of loop portions, the loop portion being a first loop portion of the plurality of loop portions, and
wherein the first loop portion is in fluid communication with a second loop portion of the plurality of loop portions via a conduit, the second loop portion being adjacent to the first loop portion about a circumferential direction around the prechamber housing.

2. The prechamber assembly of claim 1 , wherein a portion of the at least one cooling channel extends along a first height (H 1 , h 1 ) defined by the first prechamber housing portion.

3. The prechamber assembly of claim 1 , wherein the at least one cooling channel extends from a cooling inlet opening to a cooling outlet opening, each of the cooling inlet opening and the cooling outlet opening being defined by the external surface of the prechamber housing.

4. The prechamber assembly of claim 1 , wherein the at least one cooling channel includes a plurality of cooling channels, such that each cooling channel of the plurality of cooling channels uniquely corresponds to a passage of the plurality of passages.

5. The prechamber assembly of claim 1 , wherein the at least one cooling channel includes a plurality of cooling channels, and a total number of cooling channels in the plurality of cooling channels is less than a total number of passages in the plurality of passages.

6. The prechamber assembly of claim 1 , wherein the at least one cooling channel includes a plurality of cooling channels, and a total number of cooling channels is greater than a total number of passages in the plurality of passages.

7. The prechamber assembly of claim 1 , wherein the prechamber assembly is manufactured using an additive manufacturing process.

8. A computer-readable three-dimensional model suitable for use in manufacturing the prechamber assembly of claim 7 .

9. An engine comprising:
a cylinder block defining at least one cylinder, which defines at least one main combustion chamber therein;
a cylinder head positioned on the cylinder block; and
at least one prechamber assembly comprising:
a prechamber housing with a first prechamber housing portion and a second prechamber housing portion, wherein the first prechamber housing portion and the second prechamber housing portion define a prechamber volume therein,
a prechamber housing wall being defined between an internal surface of the prechamber housing and an external surface of the prechamber housing,
the prechamber housing wall defining a plurality of passages therethrough, each passage of the plurality of passages extending from a passage inlet defined by the internal surface of the prechamber housing to a passage outlet defined by the external surface of the prechamber housing, the prechamber volume being in fluid communication with the at least one main combustion chamber via each passage; and
a cooling system configured to cool at least one of the first prechamber housing portion and the second prechamber housing portion based on a flow of a cooling fluid through the cooling system, the cooling system comprising at least one cooling channel defined within the prechamber housing wall,
the at least one cooling channel including a loop portion that at least partially surrounds one passage of the plurality of passages about a circumferential direction of the one passage, the circumferential direction of each passage extending circumferentially about a flow direction through each passage,
the loop portion being configured to cool the one passage based on the flow of the cooling fluid through the cooling system,
wherein the at least one cooling channel includes a plurality of cooling channels, such that each cooling channel of the plurality of cooling channels uniquely corresponds to a passage of the plurality of passages.

10. The engine of claim 9 , wherein the cylinder head includes an aperture defined therein, the at least one prechamber assembly being positioned within the aperture of the cylinder head.

11. The engine of claim 9 , wherein a portion of the at least one cooling channel extends along a first height (H 1 , h 1 ) defined by the first prechamber housing portion.

12. The engine of claim 9 , wherein the at least one cooling channel extends from a cooling inlet opening to a cooling outlet opening, each of the cooling inlet opening and the cooling outlet opening being defined by the external surface of the prechamber housing.

13. The engine of claim 9 , wherein the at least one cooling channel includes a plurality of loop portions, the loop portion being a first loop portion of the plurality of loop portions, and
wherein the first loop portion is in fluid communication with a second loop portion of the plurality of loop portions via a conduit, the second loop portion being adjacent to the first loop portion about a circumferential direction around the prechamber housing.

14. The engine of claim 9 , wherein the at least one cooling channel includes a plurality of cooling channels, such that a total number of cooling channels in the plurality of cooling channels is less than a total number of passages in the plurality of passages.

15. The engine of claim 9 , wherein the at least one cooling channel includes a plurality of cooling channels, such that a total number of cooling channels in the plurality of cooling channels is greater than a total number of passages in the plurality of passages.

16. The prechamber assembly of claim 1 , wherein the loop portion extends completely around the one passage about the circumferential direction of the one passage.

17. The engine of claim 9 , wherein the loop portion extends completely around the one passage about the circumferential direction of the one passage.

18. The engine of claim 9 , wherein the flow direction through each passage is transverse to a longitudinal direction of the

Assignees

• Caterpillar Energy Solutions Gmbh

Inventors

• Maier Thomas

Classifications

• F02F1/40

  cylinder heads with means for directing, guiding, or distributing liquid stream · CPC title

• F01P3/16

  for cooling fuel injectors or sparking-plugs · CPC title

• Y02T10/125

  Cross-Sectional Technologies · mapped topic

• F02B19/1019

  with only one pre-combustion chamber (F02B19/1004 take precedence) · CPC title

• F02B19/12

  with positive ignition (engines with non-timed positive ignition, and with incandescent chambers F02B9/08) · CPC title