Method for producing a cylinder liner surface and cylinder liner

Patent metadata

Field	Value
Publication number	US-9488126-B2
Application number	US-201214130514-A
Country	US
Kind code	B2
Filing date	Jul 4, 2012
Priority date	Jul 5, 2011
Publication date	Nov 8, 2016
Grant date	Nov 8, 2016

Abstract

A method for producing a cylinder liner surface for a cylinder crankcase of an internal combustion engine has the following method steps: (a) preliminary honing of the inner surface of a cylinder liner consisting of a cast iron material to form depressions in the surface; (b) application of a coating material containing zinc to the honed surface; (c) final honing of the coated surface in such a way that the coating material containing zinc remains only in the depressions formed by the preliminary honing.

First claim

The invention claimed is:

1. A method for the production of a cylinder working surface for a cylinder crankcase housing of an internal combustion engine in which the working surface is protected from corrosion via a cathodic protective effect, comprising the following method steps:
(a) pre-honing of the inner surface of a cylinder liner composed of a cast iron material, with the formation of depressions in the surface using a honing tool having honing stones;
(b) application of a zinc-containing coating material onto the pre-honed surface;
(c) finish-honing of the coated surface, in such a manner that the zinc-containing coating remains only in the depressions formed by means of the pro-honing, such that the remaining zinc coating material forms a cathodic protective effect against corrosive attack on said cast-iron material.

2. The method according to claim 1 , wherein in step (b), the pre-honed surface is coated with a zinc film.

3. The method according to claim 1 , wherein in step (b), a zinc varnish on an inorganic basis is used.

4. The method according to claim 1 , wherein in step (b), the zinc-containing coating is applied by means of a scraping method.

5. The method according to claim 1 , wherein in step (b), the coating material is applied by means of thermal spraying, by means of cold-gas spraying, or by means of vacuum suction blasting, using a zinc-containing wire or a zinc-containing powder.

6. The method according to claim 1 , wherein between step (a) and step (b), pocket-shaped depressions are introduced into the pre-honed surface.

7. The method according to claim 6 , wherein the pocket-shaped depressions cover 2% to 10% of an area of the surface.

8. The method according to claim 6 , wherein the pocket-shaped depressions are introduced into the surface using a laser beam method.

9. The method according to claim 6 , wherein the pocket-shaped depressions are introduced into the surface with a diameter of 30 μm to 50 μm.

10. The method according to claim 6 , wherein the pocket-shaped depressions are introduced into the surface with a maximal depth of 100 μm.

11. Cylinder liner composed of a cast-iron material, for a cylinder crankcase of an internal combustion engine, which can be produced by means of a method according to claim 1 .

Assignees

• Bischofberger Ulrich
• Gaiselmann Stefan
• Mahle Int Gmbh

Inventors

• Bischofberger Ulrich
• Gaiselmann Stefan

Classifications

• C23C26/00

  Coating not provided for in groups C23C2/00 - C23C24/00 · CPC title

• C23C4/08

  containing only metal elements (C23C4/073 takes precedence) · CPC title

• C23C24/04

  Impact or kinetic deposition of particles · CPC title

• C23C4/02 Primary

  Pretreatment of the material to be coated, e.g. for coating on selected surface areas · CPC title

• F02F1/20

  characterised by constructional features providing for lubrication · CPC title