Rough cast cylinder liner

Patent metadata

Field	Value
Publication number	US-10465627-B2
Application number	US-201815966187-A
Country	US
Kind code	B2
Filing date	Apr 30, 2018
Priority date	Apr 27, 2016
Publication date	Nov 5, 2019
Grant date	Nov 5, 2019

Abstract

A cylinder liner for internal combustion engines has an outer roughened surface that has particularly good adherence properties. The surface has is covered with protrusions or spines of varying shapes and sizes, which are created by spraying the mold with a coating and then casting the cylinder liner in the mold. The spines are generally worm-shaped, with a length greater than a width, and a large spacing between the spines.

First claim

What is claimed is:

1. A cast cylinder liner for an internal combustion engine, having an outer surface with a plurality of spines disposed thereon, each of the spines having a length that is greater than a width, wherein the width of each spine ranges from 0.3-1.5 mm and the length of each spine ranges from 0.4-3.2 mm, wherein the liner has a spine count of 20-40 spines/cm 2 , wherein the spines occupy an area of 14-22% of the total area of the cylinder liner, wherein the spines vary in cross-section and distances from one another, wherein a distance between at least two of the spines is 0.80 mm and a distance between at least two other of the spines is 1.78 mm and distances between any of the spines and a nearest spine is between 0.80 mm and 1.78 mm.

2. The cast cylinder liner according to claim 1 , wherein each spine has a surface area of 0.1-2.0 mm 2 .

3. The cast cylinder liner according to claim 1 , wherein the spines have an average perimeter measurement of 2.0-4.5 mm.

4. The cast cylinder liner according to claim 1 , wherein the spines have a height of 0.4-0.7 mm.

5. The cast cylinder liner according to claim 1 , wherein the spines have a distance from one another of between 0.6-2.5 mm.

6. The cast cylinder liner according to claim 1 , wherein the spines have a circularity of 0.3-0.8.

7. A cast cylinder liner for an internal combustion engine, having an outer surface with a plurality of spines disposed thereon, each of the spines having a length that is greater than a width, wherein the width of each spine ranges from 0.3-1.5 mm and the length of each spine ranges from 0.4-3.2 mm, wherein the spines have an average perimeter measurement of 2.0-4.5 mm, wherein the spines occupy an area of 14-22% of the total area of the cylinder liner, wherein the spines vary in cross-section and distances from one another, wherein a distance between at least two of the spines is 0.80 mm and a distance between at least two other of the spines is 1.78 mm and distances between any of the spines and a nearest spine is between 0.80 mm and 1.78 mm.

8. The cast cylinder liner according to claim 7 , wherein the liner has a spine count of 20-40 spines/cm 2 .

9. The cast cylinder liner according to claim 7 , wherein each spine has a surface area of 0.1-2.0 mm 2 .

Assignees

• Mahle Int Gmbh

Inventors

• Smith Thomas
• Rudolph Steffen
• MAGALLANES CASTAÑEDA Jesús Antonio

Classifications

• F02F1/102

  Attachment of cylinders to crankcase · CPC title

• F02F1/004 Primary

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

• F02F2200/06

  Casting · CPC title

• F02F1/14

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

• F02F1/163

  the liner being midsupported · CPC title