Engine cylinder liner with liner catcher

Patent metadata

Field	Value
Publication number	US-11041455-B2
Application number	US-201916688863-A
Country	US
Kind code	B2
Filing date	Nov 19, 2019
Priority date	Nov 19, 2019
Publication date	Jun 22, 2021
Grant date	Jun 22, 2021

Abstract

Systems and methods are provided for a cylinder liner for an engine including a catcher feature on a side surface to provide radial support and improved coolant sealing. In one example, the catcher feature may include a continuous stepped catcher extending from the cylinder liner body and a stepped tab of the engine block, the stepped catcher resting on the stepped tab. Also, a radial flange in the upper portion of the cylinder liner may be coupled to the engine block, the coupling sealed via an O-ring nestled in a groove formed in the radial flange.

First claim

The invention claimed is:

1. A system, comprising:
an engine block, comprising:
a stepped tab having a first wall with a first diameter, a second wall with a second diameter which is less than the first diameter, the second wall extending inward towards a cylinder liner, and an angled shoulder between the first wall and the second wall; and

a cylinder liner, comprising:
a hollow cylindrical body with an upper end and a lower end, the cylindrical body configured to surround a combustion chamber defined by a cylinder bore in the engine block;
a continuous radial flange extending from the cylindrical body at the upper end, the flange configured to rest on a depression formed on the engine block; and
a continuous stepped catcher of the cylindrical body at a location closer to the lower end than the upper end, the stepped catcher comprising a first portion with a diameter matching the first diameter of the first wall and a second portion with a diameter matching the second diameter of second first wall, and an angled step connecting the first portion and the second portion of the stepped catch, the angled step configured to rest on the stepped tab.

2. The system of claim 1 , wherein the stepped catcher is positioned axially downwards from the radial flange.

3. The system of claim 1 , wherein the second diameter on the upper end of the catcher is smaller than a diameter of the flange.

4. The system of claim 1 , wherein the diameter of the cylinder liner decreases from the first diameter of the cylinder bore to the second diameter of the cylinder bore instantaneously at the angled step.

5. The system of claim 1 , wherein a height of the stepped catcher between the first portion and the second portion matches a height of the angled shoulder of the block.

6. The system of claim 1 , wherein the stepped catcher has an outer concave surface.

7. The system of claim 1 , wherein an outer edge of the radial flange includes a circumferential groove, the liner further comprising an O-ring nestled in the groove, the flange configured to engage the block via the O-ring.

8. A system, comprising:
an engine block, comprising:
a stepped tab having a first wall with a first diameter, a second wall with a second diameter which is less than the first diameter, the second wall extending inward towards a cylinder liner, and an angled shoulder between the first wall and the second wall; and

a cylinder liner, comprising:
a liner body;
a radial flange extending circumferentially from an upper end of the liner body and configured to engage an upper surface of the cylinder bore; and
a stepped element extending circumferentially from the liner body, the stepped element comprising a first portion with a diameter matching the first diameter of the first wall and a second portion with a diameter matching the second diameter of second first wall, and an angled step connecting the first portion and the second portion of the stepped element, the angled step configured to engage the angled shoulder of the engine block, and the stepped element of the liner located axially below the flange.

9. The system of claim 8 , wherein the stepped element is positioned proximate to a lower end of the liner body.

10. The system of claim 8 , wherein when the liner is disposed in the bore the first portion curves outwards from a surface of the liner towards the engine block surface.

11. The system of claim 10 , wherein the curved upper edge forms a concave surface.

12. The system of claim 8 , wherein the radial flange includes an outer circumferential groove housing an O-ring.

13. A system, comprising:
an engine block including a cylinder bore, the engine block comprising:
a stepped tab having a first wall with a first diameter, a second wall with a second diameter which is less than the first diameter, the second wall extending inward towards a cylinder liner, and an angled shoulder between the first wall and the second wall;

a coolant passage in the engine block configured to circulate coolant around the cylinder bore; and
a cylinder liner disposed in the bore, the cylinder liner comprising:
a flange extending radially along a circumference of an upper end of the cylinder bore, the flange engaging a surface of the engine block; and
a stepped catcher extending around an inner surface of the bore axially below the flange, the stepped catcher including an upper step with a diameter matching the first diameter of the first wall and a lower step with a diameter matching the second diameter of second first wall, the upper step extending further outwards than the lower step, and an angled step connecting the upper step and the lower step, the upper step engaging the first wall of the engine block and the angled step engaging the angled shoulder of the engine block when the cylinder liner moves downward into the cylinder bore.

14. The system of claim 13 , wherein an upper surface of the upper step curves towards the lower end of the liner while extending away from a central axis of the bore, and wherein a lower surface of the lower step is rectilinear.

15. The system of claim 13 , wherein a diameter of the liner at the flange is larger than the diameter of the liner at the first step, wherein the surface of the engine block engaging the flange is curved while the another surface engaging the liner catcher is rectilinear.

16. The system of claim 13 , wherein a diameter of the liner at the flange is larger than the diameter of the liner at the first step.

17. The system of claim 13 , wherein the liner includes a groove along an outer edge of the flange, the groove housing an O-ring, the flange engaging the surface of the engine block via the O-ring.

18. The system of claim 1 , further comprising rings coupled to the engine block; and
recesses in the cylinder liner configured to mate with the rings.

19. The system of claim 8 , further comprising rings coupled to the engine block; and
recesses in the cylinder liner configured to mate with the rings, and the recesses positioned between the radial flange and the stepped element.

20. The system of claim 13 , further comprising elastomeric rings coupled to the engine block; and
recesses in the cylinder liner configured to mate with the rings, and the recesses positioned between the radial flange and the stepped element.

Assignees

• Transp Ip Holdings Llc

Inventors

• Kumar Kotha Ramesh

Classifications

• F02F11/005

  involving cylinder liners · CPC title

• F02F1/14

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

• F02F1/004 Primary

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

• F02F1/163

  the liner being midsupported · CPC title

• F02F1/16 Primary

  Cylinder liners of wet type · CPC title