Abstract: A piston for use in internal combustion engines or reciprocating compressors such as those utilized in air-brake systems for heavy duty freight vehicles. The body of the piston of the present invention is contoured in manner to reduce the undesirable build-up of oil pressure that frequently occurs at the oil control ring or rings when the piston is in operation. The crown portion of the piston body includes a series of piston ring groove and piston ring lands, one of which is modified to include drainage notches. The skirt portion of the piston body includes a plurality of furrows near the face of the piston, a horizontal channel recessed into the surface of the piston skirt, and a horizontal groove formed in the outer skirt wall of the piston. These structures function individually and in combination to provide multiple means by which excess lubricating oil may be directed away from the oil control rings and back toward the crankcase or oil reservoir within the engine or compressor.

Abstract: A piston for use in internal combustion engines or reciprocating compressors such as those utilized in air-brake systems for heavy duty freight vehicles. The body of the piston of the present invention is contoured in manner to reduce the undesirable build-up of oil pressure that frequently occurs at the oil control ring or rings when the piston is in operation. The crown portion of the piston body includes a series of piston ring groove and piston ring lands, one of which is modified to include drainage notches. The skirt portion of the piston body includes a plurality of furrows near the face of the piston, a horizontal channel recessed into the surface of the piston skirt, and a horizontal groove formed in the outer skirt wall of the piston. These structures function individually and in combination to provide multiple means by which excess lubricating oil may be directed away from the oil control rings and back toward the crankcase or oil reservoir within the engine or compressor.

Abstract: An air compressor with a cylinder head attached to a cylinder deck of a crankcase is disclosed. Openings are provided through the cylinder deck and cylinder head and elongated fasteners having a fastening complement are used to provide a compressed engagement between the deck and cylinder head. Using a fastener inserted through the openings and a fastener complement reduces the potential that the bore is distorted during assembly without adding material to the assembly that undesirably increases its weight or complicates foundry operations. Machining of the deck is also simplified by providing the opening therethrough.