CYLINDER LINER, APPARATUS FOR EXTRACTING A CYLINDER LINER AND METHOD FOR EXTRACTING A CYLINDER LINER

Abstract

A system includes a tool configured to move a cylinder liner relative to a reciprocating piston machine. The tool includes a first segment configured to move along a first path of travel in a first direction. The tool further includes a second segment having a gripper portion. The second segment is driven by the first segment to move along a second path of travel in a second direction crosswise to the first direction. The gripper portion is configured to engage a ring groove in the cylinder liner.

Claims

1. A system, comprising: a tool configured to move a cylinder liner relative to a reciprocating piston machine, wherein the tool comprises: a first segment configured to move along a first path of travel in a first direction; and a second segment comprising a gripper portion, wherein the second segment is driven by the first segment to move along a second path of travel in a second direction crosswise to the first direction, and the gripper portion is configured to engage a ring groove in the cylinder liner.

2. The system of claim 1, wherein the first direction is an axial direction.

3. The system of claim 1, wherein the second direction is a radial direction.

4. The system of claim 1, wherein the first and second segments engage one another along a sliding interface that converts movement of the first segment in the first direction into movement of the second segment in the second direction.

5. The system of claim 4, wherein the sliding interface comprises an angled interface.

6. The system of claim 5, wherein the angled interface comprises a conical interface.

7. The system of claim 5, wherein the first segment comprises a first angled surface along the angled interface.

8. The system of claim 7, wherein the second segment comprises a second angled surface along the angled interface.

9. The system of claim 8, wherein the second segment comprises a plurality of second segments.

10. The system of claim 1, wherein the tool comprises an adjuster configured to move along a third path of travel to drive movement of the first segment along the first path of travel.

11. The system of claim 10, wherein the third path of travel comprises a rotational path of travel.

12. The system of claim 10, wherein the tool comprises a carrier portion coupled to the first segment, the second segment, and the adjuster, wherein the first segment is configured to move along the first path of travel relative to the carrier portion, the second segment is configured to move along the second path of travel relative to the carrier portion, and the adjuster is configured to move along the third path of travel relative to the carrier portion.

13. A method for moving a cylinder liner relative to a reciprocating piston machine, comprising: moving a first segment of a tool along a first path of travel in a first direction; moving a second segment of the tool, driven by the first segment, along a second path of travel in a second direction crosswise to the first direction; and engaging a gripper portion of the second segment with a ring groove in the cylinder liner.

14. The method of claim 13, wherein the first direction is an axial direction, and the second direction is a radial direction.

15. The method of claim 13, comprising engaging the first and second segments with one another along a sliding interface that converts movement of the first segment in the first direction into movement of the second segment in the second direction.

16. The method of claim 15, wherein the sliding interface comprises an angled interface.

17. The method of claim 13, comprising moving an adjuster of the tool along a third path of travel to drive movement of the first segment along the first path of travel.

18. The method of claim 17, wherein the third path of travel comprises a rotational path of travel.

19. The method of claim 17, wherein: moving the first segment of the tool along the first path of travel comprises moving the first segment relative to a carrier portion of the tool; moving the second segment of the tool along the second path of travel relative to the carrier portion of the tool; and moving the adjuster of the tool along the third path of travel relative to the carrier portion.

20. A system, comprising: a reciprocating piston machine, a cylinder liner, or a combination thereof; and a tool configured to move the cylinder liner relative to the reciprocating piston machine, wherein the tool comprises: a first segment configured to move along a first path of travel in a first direction; and a second segment comprising a gripper portion, wherein the second segment is driven by the first segment to move along a second path of travel in a second direction crosswise to the first direction, and the gripper portion is configured to engage a ring groove in the cylinder liner.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Further details and advantages of the invention are apparent from the accompanying figures and the following description of the drawings. The figures show:

[0055] FIG. 1 illustrates the internal combustion engine 1 having a cylinder liner according to a first embodiment of the invention,

[0056] FIG. 2 illustrates the top portion of the cylinder liner of FIG. 1,

[0057] FIG. 3 illustrates the enlarged detail D of FIG. 2,

[0058] FIG. 4 illustrates the cylinder liner of FIG. 1 with removed scraper ring,

[0059] FIG. 5 illustrates the cylinder liner of FIG. 1 with attached apparatus for extracting a cylinder liner, and

[0060] FIGS. 6 and 7 illustrate the removed power unit with attached apparatus.

DETAILED DESCRIPTION

[0061] FIG. 1 shows an internal combustion engine 1 having a cylinder liner according to a first embodiment of the invention.

[0062] As can be seen, the cylinder liner 2 is mounted in the internal combustion engine 1, in more detail at the crankcase 3 of the internal combustion engine 1. The internal combustion engine 1 shown by FIG. 1 is in a state of maintenance work, wherein the power unit 4 is going to be removed.

[0063] The power unit 4 comprises the cylinder liner 3, the piston 5 and the connecting rod 6. Beside these main elements of the power unit 4 also small parts as the piston pin, the piston rings and so on are included, which are not mentioned further here.

[0064] It can be seen in this FIG. 1 that it is not possible to remove the connecting rod 6 and therefore the piston 5 through the cylinder liner 2, because the dimensions of the connecting rod 6 are too big to fit through the inner diameter of the cylinder liner 2. Therefore, the power unit 4 has to be removed as a whole, wherein the power unit 4 can be disassembled after removing from the crankcase 3 of the internal combustion engine 1.

[0065] In this context, in a first step (as shown by FIG. 1), the connecting rod 6 has to be removed from the crankshaft 7 and the cylinder head has to be removed from the internal combustion engine 1 and from the cylinder liner 2

[0066] The piston 5 and the connected connecting rod 6 are pressed back into a position, in which an area of the recess 8 of the cylinder liner 2 and the scraper ring 9 (which is arranged in the recess 8) are released.

[0067] This can be seen in more detail in FIG. 2, wherein the top portion of the cylinder liner 2 arranged in the crankcase 3 can be seen. FIG. 3 discloses the enlarged detail D of FIG. 2.

[0068] As can be seen, the size of the scraper ring 9 is adapted to fit into the recess 8 of the cylinder liner 2, wherein the groove 10 of the cylinder liner 2 is covered by the scraper ring 9.

[0069] The cylinder liner 2 of this embodiment is designed as a top-stop liner as can be seen by the flange 11, which is provided at an end of the cylinder liner 2 facing the cylinder head in a mounted state in the internal combustion engine 1.

[0070] The recess 8 is arranged in an area of a flange 11 of the cylinder liner 2, wherein the flange 11 is arranged at a top end of the cylindrical portion facing a cylinder head of the internal combustion engine 1 when the cylinder liner 2 is mounted in the internal combustion engine 1.

[0071] The recess 8 is arranged circumferentially at the inner diameter of the cylindrical portion of the cylinder liner 2 having a larger diameter than the inner diameter of the cylinder wall, wherein the circumferential recess 8 is located at one end of the cylinder liner 2 facing the cylinder head in a mounted state inside the internal combustion engine 1.

[0072] The scraper ring 9 covers the whole circumferential recess 8 in a direction of the inner diameter of the cylinder liner 2, when the at least one removable scraper ring 9 is arranged in the recess 8.

[0073] The scraper ring 9 comprises an inner diameter having the same diameter as the inner diameter of the cylinder liner 2 and the scraper ring 9 has essentially the same longitudinal length in direction parallel to a centerline 12 of the scraper ring 9 as a longitudinal length of the circumferential recess 8 in direction parallel to a centerline 12 of the cylinder liner 2.

[0074] In a next step to remove the power unit 4, the scraper ring 9 is removed from the cylinder liner 2 as shown by FIG. 4. By removing the scraper ring 9, the recess 8 and the circumferential groove 10 at the inner diameter of the recess 8 are released.

[0075] In a next step (as shown by FIG. 5), an apparatus 13 for extracting a cylinder liner 2 from a crankcase 3 of an internal combustion engine 1 is placed in the area of the flange 11, such that the gripper portions 18 of the apparatus 13 substantially line up with the at least one groove 10 in a longitudinal direction of the cylinder liner 2.

[0076] The apparatus 13 comprises a carrier portion 14, an adjustment portion 15 being arranged at the carrier portion 14, a central segment 16, and at least two outer segments 17 each comprising at least one gripper portion 18.

[0077] The adjustment portion 15 is configured to shift the position of the central segment 16 in a longitudinal direction relative to the carrier portion 14, such that said shift leads to a radial movement of the at least two outer segments 17.

[0078] The adjustment portion 15 of this embodiment is designed as an adjustment screw, which engages with a thread on an adjusting nut 21 on the carrier portion 14. By screwing the adjustment portion 15, the adjustment portion 15 can be moved (together with the central segment 16 attached to the adjustment portion 15) in a longitudinal direction relative to the carrier portion 14.

[0079] By the sliding action between the central segment 16 and the at least two outer segments 17 (at the conical contact surfaces), this longitudinal movement is transformed into a radial movement of the at least two outer cone segments 17. In this way, the radial position of the at least two outer cone segments 17 can be varied by the adjustment portion 15, wherein the at least two outer cone segments 17 can be moved in a position, wherein the gripping portions 18 of the outer segments 17 engage into the groove 10 of the cylinder liner 2.

[0080] The gripper portions 18 of the at least two outer segments 17 are shaped to fit into the groove 10 of the cylinder liner 2.

[0081] Furthermore, the apparatus 13 comprises a pulling portion 19, which is configured to be connected with a lifting device by a pulling eye 20.

[0082] In a next step, the cylinder liner 2 (together with the whole power unit 4) can be removed from the crankcase 3 using the pulling portion 19.

[0083] In FIGS. 6 and 7, the removed power unit 4 with attached apparatus can be seen.

LIST OF REFERENCE SIGNS

[0084] 1 internal combustion engine [0085] 2 cylinder liner [0086] 3 crankcase [0087] 4 power unit [0088] 5 piston [0089] 6 connecting rod [0090] 7 crankshaft [0091] 8 recess [0092] 9 scraper ring [0093] 10 groove [0094] 11 flange [0095] 12 centerline [0096] 13 apparatus [0097] 14 carrier portion [0098] 15 adjustment portion [0099] 16 central segment [0100] 17 outer segment [0101] 18 gripper portion [0102] 19 pulling portion [0103] 20 pulling eye [0104] 21 adjusting nut