Method and system for a cylinder liner
AssigneeCaterpillar Inc.
InventorsChristopher L. Batta, Aaron S. Ness, Zachary T. Jacobs
Life of this patent
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Abstract
Systems and methods for forming a plurality of valleys on an inner circumferential surface of a cylinder liner for uniform oil film thickness are disclosed. In one aspect, an internal combustion engine includes a piston; and a cylinder liner surrounding the piston, wherein the cylinder liner has a plurality of valleys on an inner circumferential surface of the cylinder liner, and wherein the plurality of valleys are formed to a frequency of 7 to 14 valleys per millimeter (mm) having a depth of at least 1 micrometer (μm).
Claims20
An internal combustion engine, comprising:
- a piston pivotally connected to a crankshaft by a connecting rod;
- and
- a cylinder liner surrounding the piston and a portion of the connecting rod, wherein the cylinder liner has a plurality of valleys on an inner circumferential surface of the cylinder liner,
- wherein the plurality of valleys have a helical trajectory and are formed to a frequency of 7 to 14 valleys per millimeter (mm) having a depth of at least 1 micrometer (μm), and wherein the plurality of valleys have a length that is equal to a length of the inner circumferential surface of the cylinder liner and are inclined towards a linear motion direction of the piston.
A cylinder liner of an internal combustion engine, comprising:
- a hollow cylindrical body formed of metal or metal alloy, including an inner circumferential surface that surrounds a piston and a portion of a connecting rod that pivotally connects the piston to a crankshaft;
- and
- a plurality of valleys with a helical trajectory formed on the inner circumferential surface of the cylinder liner, wherein the plurality of valleys are formed to a frequency of 7 to 14 valleys per millimeter (mm) and have a depth of at least 1 micrometer (μm),
- wherein the plurality of valleys intersect each other to form cross-hatching patterns, and wherein the plurality of valleys have a length that is equal to a length of the inner circumferential surface of the cylinder liner and are inclined towards a linear motion direction of the piston.
A method of making a plurality of valleys on a cylinder liner for an internal combustion engine, the method comprising:
- obtaining the cylinder liner having a hollow interior and an inner circumferential surface;
- and
- forming the plurality of valleys to a frequency of 7 to 14 valleys per millimeter (mm) and a depth of at least 1 micrometer (μm) on the inner circumferential surface of the cylinder liner,
- wherein the plurality of valleys intersect each other to form cross-hatching patterns, and wherein the plurality of valleys have a length that is equal to a length of the inner circumferential surface of the cylinder liner and are inclined towards a linear motion direction of the piston.
Dependencies are inferred from the claim text.