Patent ID: 8308447
Filing Date: 2012-11-13
Classification: F04B

Abstract:
1. A piston compressor comprising: a piston in a cylinder; a connecting rod connecting the piston to a crankshaft in a crankcase by a roller bearing; an air inlet line and an air outlet line in a cylinder head; a tube connection between the air inlet line and the crankcase for transporting cooling air from the inlet line to the crankcase, the tube connection being exterior the cylinder and structurally attaching together the crankcase, the cylinder, and the cylinder head; an inlet valve arranged in the cylinder head and connected to the tube connection, the inlet valve and the tube connection being configured to introduce the cooling air into the crankcase, and wherein the inlet valve opens when the pressure in the crankcase is less than the pressure in the air inlet line; and an outlet valve arranged in a bottom wall of the crankcase, wherein the outlet valve opens when the pressure in the crankcase exceeds a predetermined value, and the outlet valve is configured to transport cooling air, water, and contaminants out of the crankcase.