Compressor cooling system

A cooling system for an oilless air compressor having a drive unit operating a crankshaft disposed within a crankcase and to which is attached a piston movable within a compression cylinder, the cooling system comprising:

• a thermally conductive aluminum alloy cylinder insert defining a bore of the compression cylinder in which the piston rides;
• and
• a thermally conductive aluminum alloy heat sink connected to the crankcase and cast integrally to the outer diameter of the cylinder insert;
• wherein the crankcase is enclosed with no external openings for allowing outside air into the crankcase;
• wherein the cylinder insert and the heat sink are made of different aluminum alloys;
• wherein a silicon content of the cylinder insert is less than that of the heat sink;
• and
• wherein the silicon content of the cylinder insert is less than one percent.

A cooling system for an oilless air compressor having a drive unit operating a crankshaft disposed within a crankcase and to which is attached a piston movable within a compression cylinder, the cooling system comprising:

• a thermally conductive aluminum alloy cylinder insert defining a bore of the compression cylinder in which the piston rides;
• and
• a thermally conductive aluminum alloy heat sink connected to the crankcase and cast integrally to the outer diameter of the cylinder insert;
• wherein the crankcase is enclosed with no external openings for allowing outside air into the crankcase;
• and
• wherein a silicon content of the cylinder insert is less than one percent.

An oilless air compressor, comprising:

• a positive displacement compressor unit having a reciprocating piston movable within a compression cylinder, wherein the compression cylinder is comprised of a thermally conductive cylinder insert made of an aluminum alloy having a low silicon content and a thermally conductive aluminum alloy heat sink cast integrally to the outer diameter of the cylinder insert;
• a drive unit driving a crankshaft within a crankcase to reciprocate the piston within the compression cylinder;
• and
• a blower wheel external to the crankcase and rotated by the drive unit to direct air past the heat sink;
• wherein the crankcase is enclosed with substantially no external openings allowing a flow of outside air into the crankcase;
• wherein the cylinder insert has a silicon content of less than one percent and the inner bore is anodized.