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Disclosed herein is an oilless air compressor having a cooling system with a drive unit operating a crankshaft disposed within a crankcase and to which is attached a pair of pistons movable within corresponding compression cylinders. A blower wheel is concentrically mounted to the crankshaft adjacen

Disclosed herein is an oilless air compressor having a cooling system with a drive unit operating a crankshaft disposed within a crankcase and to which is attached a pair of pistons movable within corresponding compression cylinders. A blower wheel is concentrically mounted to the crankshaft adjacent the exterior of the crankcase. Each compression cylinder includes a thermally conductive cylinder insert which a bore in which the corresponding piston rides. A thermally conductive heat sink having a plurality of annular cooling fins is cast integrally to the outer diameter of each cylinder insert and connected to the crankcase such that the compression cylinders and the crankcase are completely enclosed. Each cylinder insert is made of an aluminum alloy, preferably having a low silicon content and a high melting point so that it can be insert cast within the cooling fin and anodized without degrading the surface finish of its inner bore.

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1. 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

1. 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 the cylinder insert and the heat sink are made of different aluminum alloys.