Cylinder head

Patent metadata

Field	Value
Publication number	US-12018608-B2
Application number	US-202118020481-A
Country	US
Kind code	B2
Filing date	Aug 10, 2021
Priority date	Aug 10, 2020
Publication date	Jun 25, 2024
Grant date	Jun 25, 2024

Abstract

The invention relates to a cylinder head ( 1 ) for an internal combustion engine, with a prechamber ( 2 ) which is arranged in the cylinder head ( 1 ) and is defined by an inner wall surface ( 11 ) of a prechamber wall ( 5 ), wherein the prechamber ( 5 ) comprises a first chamber portion ( 3 ) and a second chamber portion ( 4 ), wherein the first chamber portion ( 3 ) has a greater maximum diameter (D) than the second chamber portion ( 4 ), wherein at least one ignition device ( 16 ) opens into the first chamber portion ( 3 ), and the second chamber portion ( 3 ) comprises at least one overflow channel ( 7 ) for the passage of flow into a combustion chamber ( 8 ) which adjoins a fire deck ( 6 ). Am improved dissipation of heat can be achieved if at least one inner wall surface ( 11 ) of the first chamber portion ( 3 ) comprises at least one first flattened portion ( 13 ).

First claim

The invention claimed is:

1. A cylinder head for an internal combustion engine, having a prechamber which is arranged in the cylinder head and is defined by an inner wall surface of a prechamber wall, wherein the prechamber comprises a first chamber portion and a second chamber portion, wherein the first chamber portion has a greater maximum diameter (D) than the second chamber portion, wherein at least one ignition device opens into the first chamber portion, and the second chamber portion comprises at least one overflow channel for the passage of flow into a combustion chamber which adjoins a fire deck, wherein at least one inner wall surface of the first chamber portion comprises at least one first flattened portion, wherein a plurality of flattened portions selected from the group consisting of first and second flattened portions are arranged distributed around the circumference of the first chamber portion, and wherein the flattened portions selected from the group consisting of the first and second flattened portions are arranged uniformly distributed around the circumference of the first chamber portion.

2. The cylinder head according to claim 1 , wherein the at least one first flattened portion is arranged in a transition region to the second chamber portion.

3. The cylinder head according to claim 1 , wherein the prechamber—at least in the region of the first flattened portion—is surrounded by a cooling jacket, wherein the prechamber wall separates the cooling jacket from the prechamber, and wherein at least one outer wall surface of the prechamber wall includes in the region of the at least one first flattened portion a second flattened portion on the cooling jacket side.

4. The cylinder head according to claim 1 , wherein the first chamber portion has a substantially rhombus-shaped cross-section in the region of the at least one first flattened portion.

5. The cylinder head according to claim 1 , wherein each of the at least one first flattened portion is associated with a second flattened portion.

6. The cylinder head according to claim 1 , wherein the flattened portions selected from the group consisting of the first flattened portions and second flattened portions—as viewed from a perspective selected from the group consisting of in cross-section normal to a cylinder axis and a prechamber vertical axis of the prechamber—are arranged essentially in the form of a rhombus.

7. The cylinder head according to claim 1 , wherein the flattened portions selected from the group consisting of the first and second flattened portions are substantially in the form of a square cone.

8. The cylinder head according to claim 1 , wherein the flattened portions selected from the group consisting of the first and second flattened portion is of a flat, convex or concave design.

9. The cylinder head according to claim 1 , wherein the flattened portions selected from the group consisting of the first and second flattened portion is arranged in a region between a prechamber vertical axis and at least one intake channel (IN) or exhaust channel (EX).

10. The cylinder head according to claim 1 , wherein—as viewed in plan view—at least one surface normal (n) of the flattened portions selected from the group consisting of the first and second flattened portion is guided through a valve center (M) of a nearest gas exchange valve (V).

11. The cylinder head according to claim 1 , wherein at least the first flattened portion is arranged in a region of the inner wall surface which has the smallest distance to an adjacent intake channel (IN) or exhaust channel (EX).

12. The cylinder head according to claim 11 , wherein at least a second flattened portion is arranged in a region of the outer wall surface which has the smallest distance to an adjacent intake channel (IN) or exhaust channel (EX).

13. The cylinder head according to claim 1 , wherein flattened portions selected from the group consisting of two first flattened portions and two second flattened portions are formed symmetrically with respect to at least one vertical plane (E1, E2) containing the prechamber vertical axis ( 2 a ).

14. The cylinder head according to claim 1 , wherein flattened portions selected from the group consisting of the first flattened portions and second flattened portions are formed symmetrically with respect to a first vertical plane (E1) containing the prechamber vertical axis ( 2 a ) and with respect to a second vertical plane (E2) containing the prechamber vertical axis ( 2 a ) and standing normal to the first vertical plane (E1), wherein the vertical planes (E1, E2) extend between the gas exchange valves (V) of the internal combustion engine.

15. The cylinder head according to claim 1 , wherein the prechamber is at least partially integrated into the cylinder head.

16. The cylinder head according to claim 1 wherein the prechamber is closed off by a separate cover element accommodating the ignition device, wherein a conical or crowned sealing surface is formed between the cover element and the prechamber wall.

17. The cylinder head according to claim 1 , wherein at least one component selected from the group consisting of the cylinder head and the prechamber are manufactured in an additive manufacturing process.

18. The cylinder head according to claim 1 , wherein at least one overflow channel is drilled.

19. The cylinder head according to claim 15 , wherein the prechamber is fully integrated into the cylinder head.

Assignees

• Avl List Gmbh

Inventors

• Grillenberger Dieter
• Pausch Michaela
• Kelz Jürgen
• Timm Jens

Classifications

• F02F1/36

  for liquid cooling · CPC title

• F02B19/16 Primary

  Chamber shapes or constructions not specific to sub-groups F02B19/02 - F02B19/10 · CPC title

• F02B19/12

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

• B33Y80/00

  Products made by additive manufacturing · CPC title

• Y02T10/12

  Improving ICE efficiencies · CPC title