Coolant compressor

Abstract

The invention relates to a coolant compressor having a compressor housing (6), an electric drive unit comprising a rotor (4) and a stator (3), a crankshaft (1) rotationally fixedly connected to the rotor (4) and having a longitudinal axis (2); and a piston-cylinder unit (5) that can be driven by the crankshaft (1). In order to permit an increased feed rate of lubricant from a lubricant sump, according to the invention, on an end of the crankshaft (1) that is opposite to the piston-cylinder unit (5) there is arranged a sleeve-like lubricant receptacle (8) for the centrifugal delivery of lubricant out of the lubricant sump in the direction of the piston-cylinder unit (5), wherein the sleeve-like lubricant receptacle (8) is fixed to the crankshaft (1) via a fixing section (9), wherein the fixing section (9) of the sleeve-like lubricant receptacle (8) is at least partly arranged between crankshaft (1) and rotor (4) in the radial direction in relation to the longitudinal axis (2) of the crankshaft (1).

What is claimed is: 
     
         1 . A refrigerant compressor comprising
 a housing;   an electric drive unit comprising a rotor and a stator;   a crankshaft having a longitudinal axis that is connected rotationally fixedly to the rotor;   a piston-cylinder-unit that can be driven by the crankshaft,   
       wherein, at an end of the crankshaft opposite from the piston-cylinder-unit, a sleeve-shaped lubricant receptacle is arranged for centrifugal conveyance of lubricant from a lubricant sump formed in a bottom region of the compressor housing in the direction of the piston-cylinder unit, 
       wherein the sleeve-shaped lubricant receptacle has a fastening portion by which the sleeve-shaped lubricant receptacle is fastened to the crankshaft, 
       wherein at least a section of the fastening portion of the sleeve-shaped lubricant receptacle is arranged, viewed in the radial direction relative to the longitudinal axis of the crankshaft, between the crankshaft and the rotor. 
     
     
         2 . The refrigerant compressor according to  claim 1 , wherein an inner surface of the fastening portion of the sleeve-shaped lubricant receptacle contacts a circumferential surface of the crankshaft and in that an outer surface of the fastening portion of the sleeve-shaped lubricant receptacle contacts an inner surface of the rotor. 
     
     
         3 . The refrigerant compressor according to  claim 1 , wherein the fastening portion of the sleeve-shaped lubricant receptacle is rotationally fixed between the rotor and the crankshaft. 
     
     
         4 . The refrigerant compressor according to  claim 1 , wherein an overlap of the rotor and the fastening portion in the axial direction relative to the longitudinal axis is more than 50% of the axial extent of the fastening portion relative to the longitudinal axis. 
     
     
         5 . The refrigerant compressor according to  claim 1 , wherein the sleeve-shaped lubricant receptacle has a rotationally symmetrical shape relative to the longitudinal axis, the diameter of the fastening portion being greater than or at least equal to the diameter of a receiving portion of the lubricant receptacle. 
     
     
         6 . The refrigerant compressor according to  claim 5 , wherein the fastening portion of the sleeve-shaped lubricant receptacle extends parallel to the longitudinal axis and in that the sleeve-shaped lubricant receptacle comprises a collar portion adjoining the fastening portion and extending radially outward relative to the longitudinal axis. 
     
     
         7 . The refrigerant compressor according to  claim 1 , wherein the fastening portion of the sleeve-shaped lubricant receptacle has at least one slot-like cutback, the rotor comprising at least one ridge corresponding to the cutback. 
     
     
         8 . The refrigerant compressor according to  claim 1 , wherein the electric drive unit is configured as an external-rotor motor and the rotor has at least one carrier element extending outward radially to the longitudinal axis, the carrier element being rotationally fixedly connected to the crankshaft. 
     
     
         9 . The refrigerant compressor according to  claim 8 , wherein the carrier element has a central through-opening for connecting the crankshaft, wherein an outer surface of the fastening portion of the sleeve-shaped lubricant receptacle contacts a wall surface of the through-opening. 
     
     
         10 . The refrigerant compressor according to  claim 9 , wherein the through-opening is formed by a sleeve-like prolongation of the carrier element and in that an annular support element is pressed onto or shrink-fitted onto the sleeve-shaped prolongation. 
     
     
         11 . The refrigerant compressor according to  claim 1 , wherein the electric drive unit is configured as an internal-rotor motor, and the rotor has a central through-opening for connection to the crankshaft, wherein an outer surface of the fastening portion of the sleeve-shaped lubricant receptacle contacts a wall surface of the through-opening. 
     
     
         12 . The refrigerant compressor according to  claim 1 , wherein a lubricant driver is arranged in the interior of the sleeve-shaped lubricant receptacle. 
     
     
         13 . The refrigerant compressor according to  claim 1 , wherein the housing is hermetically sealable. 
     
     
         14 . The refrigerant compressor according to  claim 1 , wherein the lubricant receptacle is rotationally fixedly fastened to the crankshaft. 
     
     
         15 . The refrigerant compressor according to  claim 1 , wherein an overlap of the rotor and the fastening portion in the axial direction relative to the longitudinal axis is between 75% and 100% of the axial extent of the fastening portion relative to the longitudinal axis. 
     
     
         16 . The refrigerant compressor according to  claim 6 , wherein the collar portion of the sleeve-shaped lubricant receptacle bears against the rotor. 
     
     
         17 . The refrigerant compressor according to  claim 7 , wherein the at least one slot-like cutback extends parallel to the longitudinal axis over the entire extent of the fastening portion. 
     
     
         18 . The refrigerant compressor according to  claim 12 , wherein the lubricant driver and the lubricant receptacle are formed integrally.