Cylinder lubrication system
AssigneeGM Global Technology Operations LLC
InventorRobert D. Straub
Life of this patent
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Abstract
A cylinder lubrication system comprises a cylinder liner defining a cylinder, a piston reciprocally mounted in the cylinder for axial travel along a cylinder axis and having a piston skirt that moves in close proximity with the cylinder, an oil supply passage extending substantially circumferentially about an outer surface of the cylinder liner, an oil supply line fluidly connecting the oil supply passage to an oil supply, a series of small holes extending radially through the cylinder liner, from the cylinder to the oil supply passage, and operable as oil passages for lubricating oil from the oil supply to flow to the upper portion of the cylinder.
Claims20
A cylinder lubrication system comprising;
- a cylinder liner defining a cylinder;
- a piston reciprocally mounted in the cylinder for axial travel along a cylinder axis between a lower portion of the cylinder liner and an upper portion of the cylinder liner, the piston having a piston skirt that moves in close proximity with the cylinder liner;
- the cylinder liner defining one or more ports through the lower portion for passage of at least one of an intake charge and an exhaust charge;
- a sealing band extending about the upper portion of the cylinder liner and defining an oil supply passage extending substantially circumferentially about the upper portion of the cylinder liner;
- an oil supply line fluidly connecting the oil supply passage to an oil supply;
- a series of small openings extending radially through the upper portion of the cylinder liner, from the cylinder to the oil supply passage, and defining oil passages for lubricating oil from the oil supply to flow to the cylinder.
An internal combustion engine comprising;
- a cylinder liner defining a cylinder;
- a piston reciprocally mounted in the cylinder for axial travel along a cylinder axis between a lower portion of the cylinder liner and an upper portion of the cylinder liner;
- the cylinder liner defining one or more ports through the lower portion for passage of at least one of an intake charge and an exhaust charge;
- a sealing band extending about the upper portion of the cylinder liner and defining an oil supply passage extending substantially circumferentially about the upper portion of the cylinder liner;
- an oil supply line fluidly connecting the oil supply passage to an oil supply and comprising a metering orifice disposed therein and an electronic control valve in fluid communication therewith to control the quantity of oil delivered to the oil supply passage;
- a series of small, laser drilled openings, on the order of 40-80 microns in diameter, extending radially through the upper portion of the cylinder liner, from the cylinder to the oil supply passage, to define a porous wall portion of the upper portion of the cylinder comprising oil passages for lubricating the oil supply to flow to the upper portion of the cylinder liner.
Dependencies are inferred from the claim text.