Refrigerant compressor for motor vehicles

Abstract

Improvement for a refrigerant compressor comprising a compressor housing having at least two cylinder bores, pistons in the cylinder bores, a drive shaft chamber and a piston drive shaft in the drive shaft chamber such that this can operate with amounts of lubricant which are as small as possible, it is suggested that in the installed position of the refrigerant compressor the drive shaft chamber form a collection chamber for lubricant with an area which extends over only part of the extension of the drive shaft chamber and is located at the lowest point in the direction of gravity, that the drive shaft chamber have wall surfaces which adjoin the collection chamber and guide the lubricant accumulating in the drive shaft chamber to the collection chamber, and that a lubricant conveying device take up the lubricant from the collection chamber and convey it to lubrication points.

1 . Refrigerant compressor for motor vehicles comprising 
 a compressor housing,    at least two cylinder bores arranged in the compressor housing,    pistons arranged in the cylinder bores,    a drive shaft chamber arranged in the compressor housing as well as a piston drive shaft arranged in the drive shaft chamber,    wherein in the installed position of the refrigerant compressor the drive shaft chamber forms a collection chamber for lubricant with an area extending over only part of the extension of the drive shaft chamber and being located at the lowest point in the direction of gravity, wherein the drive shaft chamber has wall surfaces adjoining the collection chamber, said wall surfaces guiding the lubricant accumulating in the drive shaft chamber to the collection chamber, and wherein a lubricant conveying device takes up the lubricant from the collection chamber and conveys it to lubrication points.    
   
   
       2 . Refrigerant compressor as defined in  claim 1 , wherein the wall surfaces guide essentially all the lubricant accumulating in the drive shaft chamber to the collection chamber.  
   
   
       3 . Refrigerant compressor as defined in  claim 1 , wherein some of the wall surfaces extend at an angle to a drive shaft axis of the piston drive shaft.  
   
   
       4 . Refrigerant compressor as defined in  claim 1 , wherein the collection chamber borders on a housing cover of the compressor housing.  
   
   
       5 . Refrigerant compressor as defined in  claim 4 , wherein the housing cover extends transversely to the drive shaft axis of the piston drive shaft.  
   
   
       6 . Refrigerant compressor as defined in  claim 1 , wherein the drive shaft chamber is located beneath a cylinder chamber of the compressor housing in the direction of gravity in the installed position of the compressor.  
   
   
       7 . Refrigerant compressor as defined in  claim 6 , wherein the cylinder chamber is designed in such a manner that lubricant accumulating in it essentially enters the drive shaft chamber.  
   
   
       8 . Refrigerant compressor as defined in  claim 1 , wherein the collection chamber is integrally formed in a drive shaft section of the compressor housing.  
   
   
       9 . Refrigerant compressor as defined in  claim 1 , wherein the wall surfaces guiding the lubricant to the collection chamber are integrally formed in the drive shaft section.  
   
   
       10 . Refrigerant compressor as defined in  claim 8 , wherein the drive shaft section of the compressor housing forms a pan inclined towards the collection chamber.  
   
   
       11 . Refrigerant compressor as defined in  claim 1 , wherein the collection chamber always remains the subsection of the drive shaft section located at the lowest point with an inclination of a drive shaft axis of up to at the most plus/minus 35° in relation to the installed position.  
   
   
       12 . Refrigerant compressor as defined in  claim 1 , wherein the collection chamber always collects the lubricant with an inclination of the compressor housing about the drive shaft axis of the piston drive shaft of up to at the most plus/minus 90° in relation to the installed position.  
   
   
       13 . Refrigerant compressor as defined in  claim 1 , wherein the lubricant conveying device comprises a lubricant pitching disk engaging in the collection chamber.  
   
   
       14 . Refrigerant compressor as defined in  claim 13 , wherein the lubricant pitching disk is driven by the piston drive shaft.  
   
   
       15 . Refrigerant compressor as defined in  claim 14 , wherein the piston drive shaft bears the lubricant pitching disk.  
   
   
       16 . Refrigerant compressor as defined in  claim 13 , wherein the lubricant pitching disk is arranged close to the compressor housing cover located nearest to the collection chamber.  
   
   
       17 . Refrigerant compressor as defined in  claim 13 , wherein the lubricant pitching disk extends essentially vertically in the installed position.  
   
   
       18 . Refrigerant compressor as defined in  claim 13 , wherein the lubricant conveying device has a receiving chamber for lubricant pitched by the lubricant pitching disk.  
   
   
       19 . Refrigerant compressor as defined in  claim 18 , wherein the receiving chamber is arranged such that lubricant pitched against a collecting surface and running down it enters said chamber.  
   
   
       20 . Refrigerant compressor as defined in  claim 18 , wherein the receiving chamber is arranged in the housing cover.  
   
   
       21 . Refrigerant compressor as defined in  claim 18 , wherein the collecting surface is arranged on the housing cover.  
   
   
       22 . Refrigerant compressor as defined in  claim 19 , wherein the lubricant conveying device has guide ribs guiding the lubricant into the receiving chamber.  
   
   
       23 . Refrigerant compressor as defined in  claim 1 , wherein the lubricant conveying device comprises a central lubricant channel integrated into the piston drive shaft.  
   
   
       24 . Refrigerant compressor as defined in  claim 23 , wherein lubricant is suppliable to the central lubricant channel from the receiving chamber.  
   
   
       25 . Refrigerant compressor as defined in  claim 23 , wherein the central lubricant channel is provided with lubricant supply channels for lubrication points of the piston drive shaft, said supply channels extending transversely to said lubricant channel.  
   
   
       26 . Refrigerant compressor as defined in  claim 1 , wherein the filling amount of the lubricant in the refrigerant compressor is less than double the capacity of the refrigerant compressor.  
   
   
       27 . Refrigerant compressor as defined in  claim 26 , wherein the filling amount of the lubricant is less than 1.5 times the capacity of the refrigerant compressor.  
   
   
       28 . Refrigerant compressor for motor vehicles comprising a compressor housing, at least two cylinder bores arranged in the compressor housing, pistons arranged in the cylinder bores, a drive shaft chamber arranged in the compressor housing as well as a piston drive shaft arranged in the drive shaft chamber, wherein the piston drive shaft is mounted in the compressor housing only in slide bearings and wherein the slide bearings have slide coatings with lubrication deficiency properties.  
   
   
       29 . Refrigerant compressor as defined in  claim 28 , wherein drive elements for the pistons are mounted on the piston drive shaft with slide bearings having slide coatings with lubrication deficiency properties.  
   
   
       30 . Refrigerant compressor as defined in  claim 28 , wherein the drive elements are mounted on the pistons with slide bearings having slide coatings with lubrication deficiency properties.  
   
   
       31 . Refrigerant compressor as defined in  claim 28 , wherein the pistons are guided on the cylinder working surfaces in a manner with lubrication deficiency properties.  
   
   
       32 . Refrigerant compressor as defined in  claim 31 , wherein the pistons have piston rings with lubrication deficiency properties.  
   
   
       33 . Refrigerant compressor as defined in  claim 31 , wherein the pistons are provided with slide coatings with lubrication deficiency properties.  
   
   
       34 . Refrigerant compressor as defined in  claim 31 , wherein the pistons are guided on the compressor housing without any cylinder liners.  
   
   
       35 . Refrigerant compressor as defined in  claim 28 , wherein the slide coatings with lubrication deficiency properties comprise PTFE.  
   
   
       36 . Refrigerant compressor as defined in  claim 35 , wherein additives improving the stability of the PTFE are incorporated into it.  
   
   
       37 . Refrigerant compressor as defined in  claim 28 , wherein the slide coatings with lubrication deficiency properties comprise a porous layer consisting of sintered bronze.  
   
   
       38 . Refrigerant compressor as defined in  claim 37 , wherein PTFE is incorporated into the porous layer consisting of sintered bronze.  
   
   
       39 . Refrigerant compressor as defined in  claim 1 , wherein the piston drive shaft is drivable free from transverse forces on the drive side.  
   
   
       40 . Refrigerant compressor as defined in  claim 39 , wherein the piston drive shaft is drivable via a coupling.  
   
   
       41 . Refrigerant compressor as defined in  claim 40 , wherein the coupling is drivable via a drive element.  
   
   
       42 . Refrigerant compressor as defined in  claim 41 , wherein the drive element is for its part mounted on the compressor housing via roller bearings.