Method for producing an internal combustion engine

Patent metadata

Field	Value
Publication number	US-11207740-B2
Application number	US-202016797213-A
Country	US
Kind code	B2
Filing date	Feb 21, 2020
Priority date	Aug 24, 2017
Publication date	Dec 28, 2021
Grant date	Dec 28, 2021

Abstract

A method for producing an internal combustion engine, includes the steps of providing a cylinder comprising a cylinder wall, wherein a surface of the cylinder wall has a structure which is designed and formed such that it can be penetrated by a coating; generating at least one barrier region by way of at least regional machining of the structure such that the coating cannot penetrate into the structure; and applying a coating to the cylinder wall, which coating does not penetrate into the structure in the at least one barrier region.

First claim

What is claimed is:

1. A method for producing an internal combustion engine, comprising:
providing a cylinder comprising a cylinder wall, wherein a surface of the cylinder wall has a structure which is designed and formed so as to be penetrable by a coating;
generating at least one barrier region by way of at least regional machining of the structure such that the coating cannot penetrate into the structure in the at least one barrier region;
applying the coating to the cylinder wall, which the coating does not penetrate into the structure in the at least one barrier region.

2. The method according to claim 1 , wherein the structure comprises grooves, scoring, fluting and/or recesses.

3. The method according to claim 1 , wherein the regional machining takes place by forming of the structure.

4. The method according to claim 3 , further comprising: constricting, reducing and/or closing the structure by forming.

5. The method according to claim 3 , further comprising:
varying a forming degree along a cylinder axis and/or in a circumferential direction of the cylinder in order to form undercuts for the coating and to form the at least one barrier region.

6. The method according to claim 5 , further comprising:
adapting an inner diameter of the cylinder in order to adjust the forming degree, or varying the forming degree by adjusting a forming tool.

7. The method according to claim 1 , wherein the regional machining takes place by introduction of a filler into the structure.

8. The method according to claim 1 , further comprising:
applying the coating by a surface coating process.

9. The method according to claim 8 , wherein the surface coating process is thermal spraying.

10. A cylinder for an internal combustion machine, comprising:
a cylinder wall;
a coating provided on the cylinder wall, wherein
the coating together with the cylinder wall form at least one cavity disposed between the coating and the cylinder wall;
the cavities are produced by:
providing a cylinder comprising the cylinder wall, wherein
a surface of the cylinder wall has a structure which is penetrable by the coating;
generating at least one barrier region by way of at least regional machining of the structure such that the coating cannot penetrate into the structure in the at least one barrier region; and
applying the coating to the cylinder wall, which coating does not penetrate into the structure in the at least one barrier region.

11. The cylinder according to claim 10 , wherein
a plurality of cavities is dimensioned and/or distributed such that a heat transfer coefficient of the cylinder wall differs at least in regions.

12. The cylinder according to claim 11 , wherein
the cylinder has a reduced heat transfer coefficient between piston reversal points.

13. The cylinder according to claim 11 , wherein
a shape, number and/or size of the cavities differ in the circumferential direction of the cylinder.

14. A crankcase comprising at least one cylinder according to claim 10 .

15. A method for producing an internal combustion engine, comprising:
providing a cylinder comprising a cylinder wall, wherein
a surface of the cylinder wall has a structure which is penetrable by a coating;
generating at least one barrier region by way of at least regional machining of the structure such that the coating cannot penetrate into the structure in the at least one barrier region; and
applying the coating to the at least one barrier region, wherein
the coating does not penetrate into the structure in the at least one barrier region.

Assignees

• Bayerische Motoren Werke Ag

Inventors

• Danneberg Frank
• Wagener Wolfram
• Woisetschlaeger Patrick

Classifications

• F02F1/004

  Cylinder liners (F02F1/08, F02F1/16 take precedence) · CPC title

• B23C3/16 Primary

  Working surfaces curved in two directions · CPC title

• C23C4/01

  Selective coating, e.g. pattern coating, without pre-treatment of the material to be coated · CPC title

• F02F2200/00

  Manufacturing · CPC title

• B23C2215/24

  Components of internal combustion engines · CPC title