Abstract: An electromagnetic clutch device for a compressor includes a crank shaft with an inner shaft end accommodated in a compressor housing and with an outer shaft end projecting axially out of the compressor housing. A pulley assembly has a rotor body and a pulley. The rotor body accommodates a coil housing and is rotatably supported on the compressor housing by a pulley bearing. The coil housing includes a radially inner annular wall, a radially outer annular wall, and a bottom an axial end of the coil housing proximate the inner shaft end. An armature plate is connected to the outer shaft end in an axially displaceable manner and rotates with the crank shaft. The outer surfaces of the inner annular wall and the outer annular wall of the coil housing have a greater distance from one another near the bottom of the coil housing than proximate the axially open end.

Abstract: An automotive air conditioning compressor with a capacity control valve improves oil retention in the crankcase with a crankcase to suction chamber passage that is formed through the central shaft. The passage inlet opening in the shaft is located within a central chamber inset into the cylinder block, and is thereby sheltered from the main chamber of the crankcase, although still open to the crankcase. So sheltering the inlet of the shaft passage between crankcase and suction chamber isolates the inlet from the greater turbulence and higher velocity gradients within main chamber of the crankcase. Less oil is thus forced through the passage and back out of the crankcase.

Abstract: An automotive air conditioning compressor with a capacity control valve improves oil retention in the crankcase with a crankcase to suction chamber passage that is formed through the central shaft. The passage inlet opening in the shaft is located within a central chamber inset into the cylinder block, and is thereby sheltered from the main chamber of the crankcase, although still open to the crankcase. So sheltering the inlet of the shaft passage between crankcase and suction chamber isolates the inlet from the greater turbulence and higher velocity gradients within main chamber of the crankcase. Less oil is thus forced through the passage and back out of the crankcase.