Cylinder liner and cast iron alloy

Patent metadata

Field	Value
Publication number	US-9506421-B2
Application number	US-201214239240-A
Country	US
Kind code	B2
Filing date	Aug 17, 2012
Priority date	Aug 17, 2011
Publication date	Nov 29, 2016
Grant date	Nov 29, 2016

Abstract

A cylinder liner for an internal combustion engine may include a cast iron alloy having a pearlitic structure with at least 70% of graphitization with spheroidal graphite morphology. The cast iron alloy may include at least 2.8% to 4.0% in weight of carbon; 1.8% to 3.5% in weight of silicon; 0.2% to 1.0% in weight of manganese; a maximum of 0.5% in weight of phosphorus; a maximum of 0.05% in weight of sulfur; a maximum of 0.5% in weight of vanadium; a maximum of 0.5% in weight of molybdenum; 0.2% to 1.5% in weight of nickel; a maximum of 0.3% in weight of tin; 0.005% to 0.06% in weight of magnesium.

First claim

The invention claimed is:

1. A Cylinder liner for an internal combustion engine, comprising:
a cast iron alloy having a pearlitic structure with at least 70% of graphitization with spheroidal graphite morphology, the cast iron alloy including:
at least 2.8% to 4.0% in weight of carbon; 1.8% to 3.5% in weight of silicon; 0.2% to 1.0% in weight of manganese; a maximum of 0.5% in weight of phosphorus; a maximum of 0.05% in weight of sulfur; a maximum of 0.5% in weight of vanadium; a maximum of 0.5% in weight of molybdenum; 0.2% to 1.5% in weight of nickel; a maximum of 0.3% in weight of tin; 0.005% to 0.06% in weight of magnesium;
at least one of the elements copper, cobalt, titanium, niobium, boron, aluminum, molybdenum, zirconium, nitrogen, antimony, arsenic and bismuth in a total of up to 7.0% of the total weight of the alloy, and iron as remainder;
an inner diameter having an induction hardening thermal treatment and a hardness between 300 HV to 835 HV; and
an elasticity modulus of at least 130 GPa;
wherein the inner diameter includes up to 1.5 mm of a martensitic structure throughout an extent of the inner diameter.

2. The cylinder liner according to claim 1 , wherein the cast iron alloy includes up to 15% in weight of ferrite.

3. The cylinder liner according to claim 1 , wherein the cast iron alloy includes a tensile strength higher than 500 Megapascal (MPa).

4. The cylinder liner according to claim 1 , wherein the cast iron alloy includes a fatigue strength greater than 230 Megapascal (MPa).

5. The cylinder liner according to claim 1 , further comprising a reduced wall thickness.

6. The cylinder liner according to claim 5 , wherein the wall thickness is reduced between 3 and 35 percent as compared to a wall thickness of approximately 9.5 mm.

7. The cylinder liner according to claim 3 , wherein the cast iron alloy includes a fatigue strength greater than 230 Megapascal (MPa).

8. The cylinder liner accord to claim 1 , wherein the pearlitic structure includes at least 99% of spheroidal graphitization.

9. A cast iron alloy for a cylinder liner, comprising:
a pearlitic structure with at least 70% of graphitization with spheroidal graphite morphology;
at least 2.8% to 4.0% in weight of carbon; 1.8% to 3.5% in weight of silicon; 0.2% to 1.0% in weight of manganese; a maximum of 0.5% in weight of phosphorus; a maximum of 0.05% in weight of sulfur; a maximum of 0.5% in weight of vanadium; a maximum of 0.5% in weight of molybdenum; 0.2% to 1.5% in weight of nickel; a maximum of 0.3% in weight of tin; 0.005% to 0.06% in weight of magnesium;
at least one of the elements copper, cobalt, titanium, niobium, boron, aluminum, molybdenum, zirconium, nitrogen, antimony, arsenic and bismuth in a total of up to 7.0% of total weight, and iron as the remainder;
an inner diameter having an induction hardening thermal treatment and a hardness between 300 HV to 835 HV, wherein the inner diameter includes up to 1.5 mm of a martensitic structure throughout an extent of the inner diameter; and
an elasticity modulus of at least 130 GPa.

10. The cast iron alloy according to claim 9 , further comprising up to 15% in weight of ferrite.

11. The cast iron alloy according to claim 9 , further comprising a tensile strength higher than 500 Megapascal (MPa).

12. The cast iron alloy according to claim 9 , further comprising a fatigue strength greater than 230 MPa.

13. The cast iron alloy according to claim 9 , further comprising a reduced wall thickness.

14. The cast iron alloy according to claim 13 , wherein the wall thickness is reduced between 3 and 35 percent as compared to a wall thickness of approximately 9.5 mm.

15. The cast iron alloy according to claim 9 , wherein the pearlitic structure includes at least 99% of spheroidal graphitization.

16. The cast iron alloy according to claim 11 , further comprising a fatigue strength greater than 230 MPa.

Assignees

• Edmo Soares J
• Mahle Metal Leve Sa
• Mahle Int Gmbh

Inventors

• Edmo Soares J

Classifications

• C22C33/08

  Making cast-iron alloys · CPC title

• C22C37/04 Primary

  containing spheroidal graphite · CPC title

• C22C37/10

  containing aluminium or silicon · CPC title

• F02F1/004 Primary

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