Abstract: A reciprocating compressor and, particularly, constructive details of lubricating oil pumps of reciprocating compressors. A constructive arrangement introduced on reciprocating compressor including helical pump of lubricating oil where the rotating shaft includes at least one lower region and at least one intermediate region. On the lower region of the rotating shaft, the lubricating oil is pumped by an internal channel of the rotating shaft and on the intermediate region of the rotating shaft, the lubricating oil is temporary stored and transferred, for the rotating shaft bearing region. The cooperating region between the retaining pin and the rotating shaft is limited by the lower region. The lower region of the rotating shaft includes, on its external side, a contouring recess. These two features prevent the cooperating region of the lower channel of the lubricant oil conduction suffering deformation by assembling the rotating shaft on the electrical engine rotor.

Abstract: The present invention refers to a hermetic compressor and, more specifically, a hermetic compressor comprising a centrifugal pump (1) to provide oil for the moving parts of said compressor. In the compressor of the present invention, the vertical shaft (7) extends axially from the rotor to form a free end (8) in its inferior portion, and said free end (8) is sized to be received in a corresponding end (12) of the centrifugal pump (1).