Method and apparatus for repairing cylinder liners

Patent metadata

Field	Value
Publication number	US-10060529-B2
Application number	US-201614996445-A
Country	US
Kind code	B2
Filing date	Jan 15, 2016
Priority date	Jan 15, 2016
Publication date	Aug 28, 2018
Grant date	Aug 28, 2018

Abstract

A method for repairing a cylinder liner includes: placing a cylinder liner having a first inner diameter and a first outer diameter into a cavity of a confinement, the cavity including a cavity inner diameter that is substantially the same as the first outer diameter of the cylinder liner; heating the cylinder liner to a temperature at which the cylinder liner undergoes plastic deformation, causing the first inner diameter of the cylinder liner to decrease; and cooling the cylinder liner. The cooled cylinder liner has a second inner diameter that is less than the first inner diameter. An apparatus for repairing a cylinder liner includes a confinement having a cavity and a fluid passageway for controlling the temperature of the confinement, and a heating block for heating the cylinder liner when the cylinder liner is inserted into the cavity.

First claim

We claim:

1. A method for repairing a cylinder liner, the method comprising:
placing a cylinder liner comprising a first inner diameter and a first outer diameter into a cavity of a confinement, the cavity comprising a cavity inner diameter that is substantially the same as the first outer diameter of the cylinder liner;
heating the cylinder liner to a temperature of about 300° C. to about 500° C. at which the cylinder liner undergoes plastic deformation, causing the first inner diameter of the cylinder liner to decrease; and
cooling the cylinder liner, wherein the cooled cylinder liner comprises a second inner diameter that is less than the first inner diameter.

2. The method of claim 1 , wherein the cooled cylinder liner comprises a second outer diameter that is less than the first outer diameter.

3. The method of claim 1 , further comprising:
heating the confinement prior to placing the cylinder liner into the cavity such that the cavity inner diameter increases to allow placement of the cylinder liner into the cavity; and
cooling the confinement after placing the cylinder liner into the cavity such that the cavity inner diameter decreases and causes the cylinder liner to mate with the cavity and result in an interference fit between the cylinder liner and the cavity.

4. The method of claim 3 , wherein the interference fit is a p6 interference fit.

5. The method of claim 3 , wherein the confinement is heated or cooled by circulating a heated or cooled fluid through the confinement.

6. The method of claim 5 , wherein the fluid is oil.

7. The method of claim 1 , further comprising cooling the cylinder liner prior to placing the cylinder liner into the cavity such that the first inner diameter of the cylinder liner decreases to allow placement of the cylinder liner into the cavity.

8. The method of claim 1 , wherein the cylinder liner is heated with an induction heater.

9. The method of claim 1 , further comprising:
machining the second inner diameter of the cylinder liner.

10. The method of claim 1 , further comprising removing the cooled cylinder liner from the cavity of the confinement.

11. The method of claim 10 , wherein removing the cooled cylinder liner from the confinement comprises heating the confinement to cause the cavity to expand and allow removal of the cooled cylinder liner, or further cooling the cylinder liner to cause the cylinder liner to contract and allow removal of the further cooled cylinder liner.

Assignees

• Caterpillar Inc

Inventors

• Cavanaugh Daniel T
• Graham Curtis
• Young Taylor
• Vazquez Luis

Classifications

• F16J10/04 Primary

  Running faces; Liners · CPC title

• B23P6/02 Primary

  Pistons or cylinders · CPC title

• F02F1/004

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

• B23P11/025

  by using heat or cold · CPC title