The invention relates to a compressor, such as an air-conditioning compressor for motor vehicles, particularly with a drive which has an adjustable swept volume, for the intake and compression of a refrigerant and a lubricant separator, which separates lubricant from the refrigerant, in particular, in the expansion pressure region of the compressor, whereby the lubricant is introduced to the drive by means of a partial flow branching off from the high pressure refrigerant flow.