Hermetically-sealed compressor with motor

In a hermetically-sealed compressor and motor, a lubricating system comprising:

• a sealed case containing in the bottom thereof accumulated lubricating oil and having an interior divided into a motor chamber and a compressor chamber, an electric motor enclosed within the motor chamber and having a rotor, compressor means enclosed within the compressor chamber and having an eccentric rotor, a common rotor shaft coupling the rotor of the electric motor and the eccentric rotor of the compressor means, inner and outer bearings rotatably supporting the rotor shaft, the compressor means having a cylinder block interposed between the inner and outer bearings and a delivery pipe connected to the compressor chamber;
• the improvement comprising a communication passage extending axially through the rotor shaft for conducting a gaseous refrigerant therethrough, one end of said communication passage being communicatively connected to the motor chamber, the other end thereof being communicatively connected to the compressor chamber, a delivery cover secured to an outer periphery of the outer bearing to define an annular delivery chamber between the delivery cover and the outer bearing, and means for forming a passage through the outer bearing, the cylinder block and the inner bearing for communicatively connecting said delivery chamber and said motor chamber, whereby the delivery gas is supplied directly through the passage into the motor chamber and returned through the communication passage from the motor chamber to the compressor chamber.