Cylinder liner for insertion into an engine block, and engine block

Patent metadata

Field	Value
Publication number	US-10422298-B2
Application number	US-201515509848-A
Country	US
Kind code	B2
Filing date	Sep 8, 2015
Priority date	Sep 9, 2014
Publication date	Sep 24, 2019
Grant date	Sep 24, 2019

Abstract

A cylinder liner for insertion into an aluminum internal-combustion engine block may include a cylindrical body of cast iron having a circumferential external surface. The cylinder liner may also have a coating deposited on and surrounding the external surface. The external surface may have a specific roughness, and the coating may include at least 98% by volume of pure nickel, and a remainder composed of impurities.

First claim

The invention claimed is:

1. A cylinder liner for insertion into an aluminum internal-combustion engine block, the cylinder liner comprising:
a cylindrical body of cast iron having a circumferential external surface; and
a coating deposited on and surrounding the external surface;
wherein the external surface has a specific roughness, and the coating includes at least 98% by volume of pure nickel, and a remainder composed of impurities including at least one of oxygen, carbon, manganese, and copper; and
wherein the specific roughness ranges from greater than 60 μm to 90 μm and
wherein the coating has a thickness ranging between 3 μm and 20 μm.

2. The cylinder liner as claimed in claim 1 , wherein the coating is applied by electrodeposition.

3. The cylinder liner as claimed in claim 1 , wherein the cylinder liner is insertable into an engine block by one of high-pressure die-casting (HPDC), low-pressure die-casting (LPDC), or gravity die-casting.

4. The cylinder liner as claimed in claim 1 , wherein the specific roughness is 70 μm.

5. The cylinder liner as claimed in claim 1 , wherein the specific roughness is 90 μm.

6. The cylinder liner as claimed in claim 1 , wherein the coating ranges between 3 μm and 10 μm.

7. A cylinder liner for insertion into an aluminum internal-combustion engine block, the cylinder liner comprising:
a cylindrical body of cast iron having a circumferential external surface; and
a coating deposited on and surrounding the external surface;
wherein the coating has a melting point ranging between 1500° C. and 1700° C. and the engine block has a melting point ranging between 500° C. and 700° C.

8. An internal-combustion engine comprising an engine block and at least one cylinder liner including:
a cylindrical body of cast iron having a circumferential external surface; and
a coating deposited on and surrounding the external surface;
wherein the external surface has a specific roughness, and the coating includes at least 98% by volume of pure nickel, and a remainder composed of impurities; and
wherein the engine block has a melting point ranging between 500° C. and 700° C.;
wherein the specific roughness ranges from greater than 60 μm to 90 μm; and
wherein the coating has a thickness ranging between 3 μm and 20 μm.

9. The internal-combustion engine as claimed in claim 8 , wherein the impurities include at least one of oxygen, carbon, manganese, and copper.

10. The internal-combustion engine as claimed in claim 8 , wherein the specific roughness is 70 μm.

11. The internal-combustion engine as claimed in claim 8 , wherein the specific roughness is 90 μm.

12. The internal-combustion engine as claimed in claim 8 , wherein the coating is applied by electrodeposition.

13. The internal-combustion engine as claimed in claim 8 , wherein the thickness ranges between 3 μm and 10 μm.

14. The internal-combustion engine as claimed in claim 8 , further comprising an engine block, wherein the cylinder liner is insertable into the engine block by one of high-pressure die-casting (HPDC), low-pressure die-casting (LPDC), or gravity die-casting.

15. The internal combustion engine as claimed in claim 8 , wherein the coating has a melting point ranging between 1500° C. and 1700° C.

Assignees

• Mahle Int Gmbh
• Mahle Metal Leve Sa

Inventors

• Deschauer Rejowski Edney
• Rabello Rafael B

Classifications

• B22D15/02

  of cylinders, pistons, bearing shells or like thin-walled objects · CPC title

• B22D25/02

  by its peculiarity of shape; of works of art {(cylinders, pistons B22D15/02)} · CPC title

• B22D17/08

  Cold chamber machines, i.e. with unheated press chamber into which molten metal is ladled · CPC title

• B22D19/0009 Primary

  Cylinders, pistons · CPC title

• B22D18/04

  Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould · CPC title