Cylinder liner for an internal combustion engine

Patent metadata

Field	Value
Publication number	US-10294885-B2
Application number	US-201615378186-A
Country	US
Kind code	B2
Filing date	Dec 14, 2016
Priority date	Dec 15, 2015
Publication date	May 21, 2019
Grant date	May 21, 2019

Abstract

A cylinder liner for an internal combustion engine may include a hollow cylindrical body. The body may include an internal surface having a longitudinal/axial length. The internal surface may be divided into at least two portions along the longitudinal/axial length. The at least two portions may respectively include a specific value of roughness and a predefined length.

First claim

The invention claimed is:

1. A cylinder liner for an internal combustion engine, comprising:
a hollow cylindrical body with an internal surface having a longitudinal/axial length, the internal surface divided into at least two portions along the longitudinal/axial length;
wherein the at least two portions comprises a first portion and a second portion;
wherein the at least two portions respectively include a specific value of roughness and a predefined length;
wherein the specific value of roughness of the first portion includes values of up to 0.30 Rpk, between 0.40 and 1.50 Rk, and between 1.10 and 2.80 Rvk; and
wherein the specific value of roughness of the second portion includes values of up to 0.30 Rpk, up to 0.40 Rk, and between 0.30 and 1.00 Rvk.

2. The cylinder liner according to claim 1 , wherein the internal surface is divided into at least three portions along the longitudinal/axial length, the at least three portions including:
the first portion disposed in a region corresponding to a position of an end of the limit of a stroke of displacement of a piston facing a head of the engine, proximate to a top dead centre;
the second portion; and
a third portion disposed in a region corresponding to a position of an end of the limit of the stroke of displacement of a piston facing a crankshaft of the engine, proximate to a bottom dead centre;
wherein the second portion is disposed between the first portion and the second portion; and
wherein the at least three portions include a respective specific value of roughness and a respective predefined length.

3. The cylinder liner according to claim 2 , wherein the respective predefined length of the at least three portions are defined such that:
a first ratio between (i) a sum of a length of the first portion and of the third portion, and (ii) the longitudinal/axial length of the cylinder liner, is greater than 0.31 and less than 0.58; and
a second ratio between a length of the first portion and of the second portion is greater than 0.15 and less than 0.46.

4. The cylinder liner according to claim 1 , wherein the internal surface further includes a constant angle of honing along the longitudinal/axial length.

5. The cylinder liner according to claim 1 , wherein the internal surface further includes a specific angle of honing for each of the at least two portions.

6. The cylinder liner according to claim 2 , wherein the respective specific value of roughness of the third portion includes values of up to 0.30 Rpk, up to 1.50 Rk, and between 0.30 and 2.80 Rvk.

7. The cylinder liner according to claim 6 , wherein the respective specific value of roughness of the first portion includes values of up to 0.30 Rpk, between 0.40 and 1.50 Rk, and between 1.10 and 2.80 Rvk.

8. The cylinder liner according to claim 7 , wherein the respective specific value of roughness of the second portion includes values of up to 0.30 Rpk, up to 0.40 Rk, and between 0.30 and 1.00 Rvk.

9. The cylinder liner according to claim 1 , wherein the at least two portions of the internal surface includes a first portion and a second portion, the first portion disposed proximate to a region corresponding to a top dead centre position of a piston stroke in relation to the second portion.

10. The cylinder liner according to claim 9 , wherein the specific value of roughness of the first portion includes values of at least one of up to 0.30 Rpk, between 0.40 and 1.50 Rk, and between 1.10 and 2.80 Rvk.

11. The cylinder liner according to claim 9 , wherein the specific value of roughness of the second portion includes values of at least one of up to 0.30 Rpk, up to 0.40 Rk, and between 0.30 and 1.00 Rvk.

12. The cylinder liner according to claim 9 , wherein the at least two portions of the internal surface further includes a third portion disposed proximate to a region corresponding to a bottom dead centre of the piston stroke in relation to the first portion, and the second portion is disposed between the first portion and the third portion, and wherein the specific value of roughness of the third portion includes values of at least one of up to 0.30 Rpk, up to 1.50 Rk, and between 0.30 and 2.80 Rvk.

13. The cylinder liner according to claim 9 , wherein the at least two portions include a specific angle of honing along the longitudinal/axial length, and wherein the specific angle of honing of the first portion is different from the specific angle of honing of the second portion.

14. A cylinder liner for an internal combustion engine, comprising:
a hollow cylindrical body defining an internal surface having a longitudinal/axial length, the internal surface including a plurality of portions divided along the longitudinal/axial length, the plurality of portions including:
a first portion disposed proximate to a region corresponding to a top dead centre position of a piston stroke, the first portion having a first specific value of roughness and a first predefined length;
a second intermediate portion having a second specific value of roughness and a second predefined length; and
a third portion disposed remote to the region corresponding to the top dead centre position in relation to the first portion and the second intermediate portion, the third portion including a third specific value of roughness and a third predefined length;
wherein the first specific value of roughness differs from at least one of the second specific value of roughness and the third specific value of roughness;
wherein the first specific value of roughness of the first portion includes values of up to 0.30 Rpk, between 0.40 and 1.50 Rk, and between 1.10 and 2.80 Rvk; and
wherein the second specific value of roughness of the second portion includes values of up to 0.30 Rpk, up to 0.40 Rk, and between 0.30 and 1.00 Rvk.

15. The cylinder liner according to claim 14 , wherein the plurality of portions defines a relationship such that:
a first ratio between (i) a sum of the first predefined length of the first portion and the third predefined length of the third portion, and (ii) the longitudinal/axial length of the internal surface, is greater than 0.31 and less than 0.58; and
a second ratio between the first predefined length of the first portion and the second predefined length of the second portion is greater than 0.15 and less than 0.46.

16. The cylinder liner according to claim 14 , wherein the second intermediate portion and one of the first portion and third portion further include a constant angle of honing therealong.

17. The cylinder liner according to claim 16 , wherein the internal surface further includes a constant angle of honing along an entirety of the longitudinal/axial length.

18. The cylinder liner according to claim 14 , wherein the third specific value of roughness of the third portion includes values of up to 0.30 Rpk, up to 1.50 Rk, and between 0.30 and 2.80 Rvk.

Assignees

• Mahle Metal Leve Sa
• Mahle Int Gmbh

Inventors

• Bettini Rabello Rafael
• Deschauer Rejowski Edney

Classifications

• F02F1/20

  characterised by constructional features providing for lubrication · CPC title

• F02F1/16

  Cylinder liners of wet type · CPC title

• F16J10/04

  Running faces; Liners · CPC title

• F02F1/004 Primary

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