Liquid-cooled internal combustion engine

Patent metadata

Field	Value
Publication number	US-10662857-B2
Application number	US-201815926346-A
Country	US
Kind code	B2
Filing date	Mar 20, 2018
Priority date	Mar 22, 2017
Publication date	May 26, 2020
Grant date	May 26, 2020

Abstract

The present invention relates to a liquid-cooled internal combustion engine comprising an engine block, which includes a plurality of cylinders, and cylinder heads closing the cylinders, wherein each cylinder is surrounded by a respective cooling liner and each cylinder head has provided therein at least one separate cooling chamber connected to the cooling liner of the associated cylinder via at least one transition channel, wherein the transition channels of at least two cylinders are interconnected via a pressure compensation chamber.

First claim

The invention claimed is:

1. A liquid-cooled internal combustion engine comprising:
an engine block, which includes a plurality of cylinders, and cylinder heads closing the cylinders, wherein
each of the cylinders is surrounded by a respective cooling liner,
each of the cylinder heads has provided therein at least one separate cooling chamber connected to the cooling liner of the associated one of the cylinders via at least one transition channel,
the transition channels of at least two of the cylinders are interconnected via a pressure compensation chamber,
at least two of the transition channels are provided for each of the cylinder heads, and
said at least two of the transition channels extending in parallel from the cylinder head.

2. The liquid-cooled internal combustion engine according to claim 1 , wherein the pressure compensation chamber is integrated in the engine block, said pressure compensation chamber extending especially in the longitudinal direction of the engine block and abutting tangentially on the cooling liners of the cylinders.

3. The liquid-cooled internal combustion engine according to claim 1 , wherein a flow path of a coolant for each of the cylinders extends from the at least one separate cooling chamber of the cylinder head to the cooling liner of the cylinder.

4. The liquid-cooled internal combustion engine according to claim 1 , wherein at least two of the separate cooling chambers are provided for each of the cylinder heads, and are interconnected via at least one connection channel.

5. The liquid-cooled internal combustion engine according to claim 4 , wherein an upper and a lower cooling subchamber are provided.

6. The liquid-cooled internal combustion engine of claim 5 , wherein at least one exhaust duct extending through each of the cylinder heads is fully surrounded by the upper and the lower cooling subchambers.

7. The liquid-cooled internal combustion engine according to claim 4 , wherein the at least two of the separate cooling chambers are interconnected via at least two of the connection channels with different diameters.

8. The liquid-cooled internal combustion engine according to claim 7 , wherein at least one exhaust duct extending through each of the cylinder heads is, at least sectionwise, fully surrounded by the separate cooling chambers of the cylinder head, as well as the connection channels.

9. The liquid-cooled internal combustion engine according to claim 1 , wherein a distributing chamber is provided, which is adapted to be connected to an external pressure source via a pressure connection and which communicates with the at least one separate cooling chamber of each of the cylinder heads via at least one channel, so that coolant can flow from the distributing chamber into the at least one separate cooling chamber.

10. The liquid-cooled internal combustion engine of claim 9 , wherein the distributing chamber is integrated in the engine block.

11. The liquid-cooled internal combustion engine according to claim 1 , wherein at least one collecting chamber is provided, which is connected to the cooling liner of each of the cylinders via one or a plurality of channels, so that a coolant can flow from each of the cooling liners of the engine block into the collecting chamber.

12. The liquid-cooled internal combustion engine of claim 11 , wherein the collecting chamber is integrated in the engine block.

13. The liquid-cooled internal combustion engine according to claim 1 , wherein at least one bypass extends from at least one of the separate cooling chambers of each of the cylinder heads and terminates in a collecting chamber, to provide a bypass flow path that circumvents the cooling liner.

14. The liquid-cooled internal combustion chamber of claim 13 , wherein said at least one bypass extends from a lower cooling subchamber.

15. The liquid-cooled internal combustion engine according to claim 1 , wherein the cylinder heads define a cylinder bank, which is produced as a cast part, at least a part of the separate cooling chambers communicating with one another via a vent line integrated in the cylinder heads and the cylinder bank.

16. The liquid-cooled internal combustion engine according to claim 1 , wherein gasket elements of cylinder head gaskets through which the partial flows of a coolant path between each of the cylinder heads and the engine block flow are configured identically for all the cylinders.

17. The liquid-cooled internal combustion engine according to claim 1 , wherein said at least two of the transition channels extend from the at least one cooling chamber to the pressure compensation chamber.

18. A liquid-cooled internal combustion engine comprising:
an engine block, which includes a plurality of cylinders, and cylinder heads closing the cylinders, wherein
each of the cylinders is surrounded by a respective cooling liner,
each of the cylinder heads has provided therein at least one separate cooling chamber connected to the cooling liner of the associated one of the cylinders via at least one transition channel,
the transition channels of at least two of the cylinders are interconnected via a pressure compensation chamber, and
the main flow path of a coolant for each of the cylinders extends from a distributing chamber via an upper cooling subchamber into a lower cooling subchamber, from where it extends via the at least one transition channel to the pressure compensation chamber, and from the pressure compensation chamber via the cooling liner into a collecting chamber.

19. A liquid-cooled internal combustion engine comprising:
an engine block, which includes a plurality of cylinders, and cylinder heads closing the cylinders, wherein
each of the cylinders is surrounded by a respective cooling liner,
each of the cylinder heads has provided therein at least one separate cooling chamber connected to the cooling liner of the associated one of the cylinders via at least one transition channel,
the transition channels of at least two of the cylinders are interconnected via a pressure compensation chamber, and
the main flow path of a coolant for each of the cylinders extends from a distributing chamber via a lower cooling subchamber into an upper cooling subchamber, from where it extends via the at least one transition channel to the pressure compensation chamber, and from the pressure compensation chamber via the cooling liner into a collecting chamber.

20. A liquid-cooled internal combustion engine comprising:
an engine block, which includes a plurality of cylinders, and cylinder heads closing the cylinders, wherein
each of the cylinders is surrounded by a respective cooling liner,
each of the cylinder heads has provided therein at least one separate cooling chamber connected to the cooling liner of the associated one of the cylinders via at least one transition channel,
the transition channels of at least two of the cylinders are interconnected via a pressure compensation chamber,
each of the cooling liners is subdivided into at least two cooling subliners, and
the cooling subliners are connected in parallel to the pressure compensation chamber and/or a collecting chamber.

21. The liquid-cooled internal combustion engine according to claim 20 , wherein a connection exists between the cooling liners of neighboring cylinders.

22. The liquid-cooled internal combustion engine of claim 20 , wherein each of the cooling liners is subdivided into a lower and an upper cooling subliner.

Assignees

• Liebherr Machines Bulle Sa
• Deere & Co

Inventors

• Palmisani Domenico
• Hedge Raghavendra
• Li Zhi
• Sullivan Michael

Classifications

• F02F1/16

  Cylinder liners of wet type · CPC title

• F01P2003/028

  Cooling cylinders and cylinder heads in series · CPC title

• F01P3/16

  for cooling fuel injectors or sparking-plugs · CPC title

• F01P2003/021

  Cooling cylinders · CPC title

• F02F1/14

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