Patent ID: 8850835

Claim:
A compressor ( 20 ) comprising: a case ( 22 ) having: an inlet; a motor compartment ( 50 ); a plurality of cylinders ( 30 - 32 ); a suction passage ( 82 ) between the motor compartment and the cylinders; a crankcase compartment ( 52 ); and an outlet; a crankshaft ( 38 ); for each of said cylinders: a piston ( 34 ) mounted for reciprocal movement at least partially within the cylinder; a connecting rod ( 36 ) coupling the piston to the crankshaft; and a pin ( 44 ) coupling the connecting rod to the piston; and an electric motor ( 24 ) within the motor compartment and comprising: a stator ( 42 ); and a rotor ( 40 ) mounted to the crankshaft, the case having a wall ( 56 ) between the motor compartment ( 50 ) and the crankcase compartment ( 52 ); wherein: the wall bears means ( 120 , 132 ; 420 ; 460 ) for coalescing oil entrained in a flow exiting a gap ( 90 ) between the rotor and the stator to prevent the oil from entering the cylinders via the suction passage.