Cylinder head for an internal combustion engine and method for the production thereof

Patent metadata

Field	Value
Publication number	US-11835013-B2
Application number	US-201917274144-A
Country	US
Kind code	B2
Filing date	Aug 30, 2019
Priority date	Sep 6, 2018
Publication date	Dec 5, 2023
Grant date	Dec 5, 2023

Abstract

The disclosure relates to a cylinder head for covering a combustion chamber of an internal combustion engine. The cylinder head comprises at least one material recess for heat isolation, which is formed in a main body of the cylinder head and is arranged between a fluid-guide channel and a cooling channel. The material recess can be produced e.g. directly during the shaping (e.g. casting or pressing) of the cylinder head and/or thereafter. For example, in the event that exhaust gas is guided through the fluid-guide channel, a significantly lower heat input occurs from the hot exhaust gas into the cooling fluid. In addition, the thermal decoupling via the material recess leads to the hot exhaust gas cooling to a lesser degree in the fluid-guide channel.

First claim

What is claimed is:

1. A cylinder head for covering a combustion chamber of an internal combustion engine, comprising:
a fluid conducting duct for feeding in a fluid to or discharging a fluid from the combustion chamber;
a cooling duct for a cooling fluid for cooling the cylinder head; and
at least one material cutout for thermal insulation, wherein the at least one material cutout is formed in a main body of the cylinder head and is arranged between the fluid conducting duct and the cooling duct, such that the at least one material cutout thermally insulates the fluid conducting duct from the cooling duct;
wherein the at least one material cutout is arranged such that the at least one material cutout is separated from the fluid conducting duct by way of the main body, and
wherein the at least one material cutout has a plurality of cutout regions which:
a) in each case have a ring segment-shaped cross section and together surround the fluid conducting duct in an annular manner; or
b) are in each case of a sleeve segment-shaped configuration and together surround the fluid conducting duct in a sleeve-shaped manner.

2. The cylinder head as claimed in claim 1 , wherein:
the at least one material cutout is produced by way of primary forming, reshaping and/or cutting; and/or
the main body is cast or printed; and/or
the at least one material cutout is formed during the primary forming of the main body or subsequently thereto.

3. The cylinder head as claimed in claim 2 , wherein the at least one material cutout is formed during the casting or printing of the main body or subsequently thereto by way of a cutting production method.

4. The cylinder head as claimed in claim 1 , wherein:
the fluid conducting duct is configured as an exhaust gas duct, an inlet duct or a compressed air removal duct; and/or
the cylinder head has a valve which is arranged for sealing the fluid conducting duct on the combustion chamber side; and/or
the cooling duct is arranged for cooling a cylinder head bottom region of the main body; and/or
the cooling duct is arranged adjacently with respect to a cylinder head bottom region of the main body.

5. The cylinder head as claimed in claim 4 , wherein the valve is a poppet valve.

6. The cylinder head as claimed in claim 1 , wherein:
the at least one material cutout is configured such that it reduces a transmission of heat between the cooling duct and the fluid conducting duct; and/or
the at least one material cutout is configured such that it insulates the fluid conducting duct and the cooling duct thermally from one another at least partially.

7. The cylinder head as claimed in claim 1 , wherein:
the at least one material cutout is filled with and/or is flowed through by ambient air; and/or
the at least one material cutout forms an air gap between the fluid conducting duct and the cooling duct; and/or
the at least one material cutout is filled with a thermal insulation material.

8. The cylinder head as claimed in claim 1 , wherein:
an outer contour of the at least one material cutout follows an outer contour of the fluid conducting duct and/or of the cooling duct at least in sections at a substantially constant spacing; and/or
the at least one material cutout surrounds the fluid conducting duct in sections or completely; and/or
the at least one material cutout has a ring segment-shaped cross section or is of a sleeve segment-shaped configuration.

9. The cylinder head as claimed in claim 1 , wherein:
the at least one material cutout follows the fluid conducting duct along at least 50%, 60%, 70%, 80% or 90% of a length of the fluid conducting duct at a substantially constant spacing; and/or
the at least one material cutout ends adjacently with respect to a cylinder head bottom region of the main body; and/or
the at least one material cutout opens into an outer face of the cylinder head in order to enable circulation of air through the at least one material cutout.

10. The cylinder head as claimed in claim 1 , wherein:
the at least one material cutout encloses the fluid conducting duct substantially completely with the exception of a cylinder head bottom region of the main body and a supporting region of the main body, wherein the supporting region supports the fluid conducting duct; and/or
the at least one material cutout encloses the fluid conducting duct at least partially.

11. The cylinder head as claimed in claim 1 , wherein the at least one material cutout has a plurality of cutout regions which:
are connected fluidically to one another by way of ducts in the main body, and/or
are arranged symmetrically around the fluid conducting duct.

12. The cylinder head as claimed in claim 1 , wherein:
a material thickness of the main body between the fluid conducting duct and the at least one material cutout is greater than or equal to 5 mm and/or less than or equal to 10 mm; and/or
a material cutout thickness of the at least one material cutout in a radial direction of the fluid conducting duct is greater than or equal to 5 mm and/or less than or equal to 15 mm.

13. The cylinder head as claimed in claim 1 , wherein:
the fluid conducting duct has an opening on an outer side of the cylinder head; and
the at least one material cutout has an opening on the outer side of the cylinder head, wherein the opening surrounds the opening of the fluid conducting duct at least partially in a ring segment-shaped manner.

14. The cylinder head as claimed in claim 13 , further comprising an annular web section formed between the opening of the fluid conducting duct and the opening of the at least one material cutout,
wherein the annular web section has at least one fastening device for attachment of a fluid line in a fluidic connection to the fluid conducting duct.

15. The cylinder head as claimed in claim 14 , wherein the at least one fastening device is a threaded hole.

16. The cylinder head as claimed in claim 1 , wherein:
the main body has a supporting region which is arranged between the fluid conducting duct and the at least one material cutout for the support of the fluid conducting duct in the main body; and/or
the at least one material cutout is configured such that it is separated fluidically from the fluid conducting duct.

17. A motor vehicle with a cylinder head as claimed in claim 1 .

18. The motor vehicle as claimed in claim 17 , wherein the motor vehicle is a utility vehicle.

19. A method for producing a cylinder head as claimed in claim 1 , comprising:
primary forming of the main body of the cylinder head, the at least one material cutout being produced in the main body directly during the primary forming of the main body and/or following the primary forming of the main body.

20. The method as claimed in claim 19 , wherein the primary forming is casting or printing.

Assignees

• Man Truck & Bus Se

Inventors

• Hirschmann Steffen
• Malischewski Thomas

Classifications

• F02F1/36 Primary

  for liquid cooling · CPC title

• F02F1/4235

  of intake channels · CPC title

• F02F1/4264

  of exhaust channels · CPC title

• F02F2001/244

  Arrangement of valve stems in cylinder heads · CPC title

• F02B77/11 Primary

  Thermal or acoustic insulation · CPC title