Compressor

A compressor for cooling systems and/or air conditioning systems and/or heat pumps, of the reciprocating type, the compressor comprising

• a casing, inside which two chambers are defined, respectively a first chamber and a second chamber
• a compression section, the first chamber corresponding to the compression section, which compression section comprises at least one compression piston, a corresponding slider-crank mechanism for moving the piston and an oil box;
• a motor of the compressor, wherein the second chamber is for the motor of the compressor;
• a transmission shaft operatively connected to said motor and to said slider-crank mechanism;
• a support portion of said transmission shaft, said chambers being separated by means of the support portion of said transmission shaft, said support portion having a passage for said shaft;
• at least one anti-friction bushing supporting said shaft, said at least one anti-friction bushing supporting said transmission shaft;
• an oil supply duct provided at least partially inside said transmission shaft, the oil supply duct having an end opening exiting in the space between said shaft and said passage so as to allow lubrication of said at least one anti-friction bushing and said shaft;
• a niche provided in a position comprised between the end of said passage facing said second chamber and said end opening of said oil supply duct;
• and
• a discharge channel operatively connected to said niche and to said oil box, so that oil lubricating said at least one anti-friction bushing and coming from said end opening is depressurized and adapted to come back at least partially into said oil box, thus eliminating or limiting an amount of oil achieving said second chamber with the motor.