Cylinder liner, apparatus for extracting a cylinder liner and method for extracting a cylinder liner

Patent metadata

Field	Value
Publication number	US-12331696-B2
Application number	US-202118275203-A
Country	US
Kind code	B2
Filing date	Feb 1, 2021
Priority date	Feb 1, 2021
Publication date	Jun 17, 2025
Grant date	Jun 17, 2025

Abstract

Cylinder liner for an internal combustion engine, comprising:
a cylindrical portion having an outer diameter and an inner diameter, the inner diameter at least partly realizing a cylinder wall, when the cylinder liner is mounted in the internal combustion engine, a circumferential recess at the inner diameter of the cylindrical portion having a larger diameter than the inner diameter of the cylinder wall, wherein the circumferential recess is located at one end of the cylindrical portion, and a removable scraper ring,

wherein the recess comprises at least one groove, wherein a size of the scraper ring is adapted to fit into the recess and to cover the at least one groove.

First claim

The invention claimed is:

1. A system, comprising:
a tool configured to extract a cylinder liner from a crankcase of an internal combustion engine, wherein the tool comprises:
a carrier portion;
an adjustment portion being arranged at the carrier portion;
a pulling portion being connected with the adjustment portion and/or the carrier portion;
at least one central segment being adjustably connected with the adjustment portion;
at least two outer segments, each comprising at least one gripper portion;
wherein the adjustment portion is configured to shift a position of the at least one central segment in a longitudinal direction relative to the carrier portion to transfer a force to the at least two outer segments to drive a radial movement of the at least two outer segments, wherein the at least one gripper portions of the at least two outer segments are shaped to fit into at least one groove of the cylinder liner.

2. The system of claim 1 , comprising:
the cylinder liner for the internal combustion engine, comprising:
a cylindrical portion having an outer diameter and an inner diameter, wherein the inner diameter at least partly defines a cylinder wall when the cylinder liner is mounted in the internal combustion engine;
a circumferential recess at the inner diameter of the cylindrical portion, wherein the circumferential recess comprises a diameter larger than the inner diameter of the cylinder wall, wherein the circumferential recess is located at one end of the cylindrical portion, and
a removable scraper ring;
wherein the circumferential recess comprises the at least one groove, wherein a size of the removable scraper ring is adapted to fit into the circumferential recess and to cover the at least one groove.

3. The system according to claim 2 , comprising the internal combustion engine having the cylinder liner.

4. The system according to claim 1 , wherein the adjustment portion and/or the carrier portion are configured to guide a position of the at least two outer segments in a longitudinal direction and/or in a radial direction.

5. The system according to claim 1 , wherein the pulling portion is configured to be connected with a lift.

6. A method for extracting the cylinder liner from the crankcase of the internal combustion engine with the tool according to claim 1 , comprising the following steps:
removing a removable scraper ring from a circumferential recess of the cylinder liner, wherein the circumferential recess comprises the at least one groove,
placing the tool in an area of the circumferential recess such that the at least one gripper portion substantially lines up with the at least one groove in the longitudinal direction of the cylinder liner;
adjusting the adjustment portion to transfer the force to the at least two outer segments to drive the radial movement of the at least two outer segments until the at least one gripper portion radially engages with the at least one groove; and,
extracting the cylinder liner by use of the pulling portion of the tool.

7. The system according to claim 1 , wherein the at least one central segment comprises a first conical surface, and the at least two outer segments comprise a second conical surface.

8. The system according to claim 7 , wherein the adjustment portion is configured to shift a position of the at least one central segment in the longitudinal direction relative to the carrier portion to cause the radial movement of the at least two outer segments by a sliding action between the first and second conical surfaces.

9. A system, comprising:
a cylinder liner, comprising
a cylindrical portion having an outer diameter and an inner diameter, wherein the inner diameter at least partly defines a cylinder wall for a reciprocating piston;
a circumferential recess at the inner diameter of the cylindrical portion, wherein the circumferential recess comprises a diameter larger than the inner diameter of the cylinder wall;
at least one groove in the circumferential recess; and
a removable scraper ring configured to fit into the circumferential recess and to cover the at least one groove; and

a tool configured to extract the cylinder liner from a machine, wherein the tool comprises:
a central segment; and
a plurality of outer segments, wherein the central segment is configured to move in an axial direction to transfer a force to the plurality of outer segments to drive the plurality of outer segments in a radial direction into the at least one groove.

10. The system of claim 9 , wherein the at least one groove is disposed at an end portion of the cylindrical portion, and the circumferential recess and the at least one groove are disposed at a flange of the cylindrical portion.

11. The system of claim 9 , wherein an inner diameter of the removable scraper ring is the same as the inner diameter of the cylindrical portion, wherein a longitudinal length of the removable scraper ring is the same as a longitudinal length of the cylindrical portion along longitudinal axes of the removable scraper ring and the cylindrical portion, respectively.

12. The system of claim 9 , wherein the tool is configured to extract the cylinder liner from the machine while the reciprocating piston remains in the machine.

13. The system of claim 9 , comprising the machine having the cylinder liner and the reciprocating piston disposed in the cylinder liner.

14. The system of claim 9 , wherein the tool is configured to transfer the force via mating surfaces that slide along one another between the central segment and the plurality of outer segments.

15. The system of claim 14 , wherein the mating surfaces comprises first and second tapered surfaces.

16. A system, comprising:
a tool configured to extract a cylinder liner from a machine, wherein the tool comprises:
a central segment; and
a plurality of outer segments, wherein the central segment is configured to move in an axial direction to transfer a force to the plurality of outer segments to drive the plurality of outer segments in a radial direction into at least one groove in the cylinder liner.

17. The system of claim 16 , wherein the tool is configured to transfer the force via mating surfaces that slide along one another between the central segment and the plurality of outer segments.

18. The system of claim 17 , wherein the mating surfaces comprises first and second tapered surfaces.

19. The system of claim 17 , wherein the mating surfaces comprises first and second conical surfaces.

20. The system of claim 16 , comprising the cylinder liner having the at least one groove within a circumferential recess in the cylinder liner, wherein a removable scraper ring is disposed in the circumferential recess over the at least one groove, and the circumferential recess is disposed at an end portion of the cylinder liner.

Assignees

• Innio Jenbacher Gmbh & Co Og

Inventors

• Fankhauser Thomas
• Becker Florian
• Dengg Johannes

Classifications

• F02F2001/006

  having a ring at the inside of a liner or cylinder for preventing the deposit of carbon oil particles, e.g. oil scrapers · CPC title

• B25B27/02

  for connecting objects by press fit or detaching same {(B25D1/16 takes precedence)} · CPC title

• B25B27/0035

  for motor-vehicles (wrenches for mounting or dismounting wheels B60B29/003) · CPC title

• F02F1/004 Primary

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