Compressor machine with two counter-rotating rotors

A compressor machine, comprising:

• a housing;
• two parallel, spaced apart shafts mounted in the housing;
• intermeshing toothed gears mounted on the shafts, one of the shafts being driven directly and the other by said intermeshing toothed gears;
• two rotors rotating in opposite directions, which are fitted to the two parallel, spaced apart shafts;
• the housing including
• axial passages;
• two radial walls which are configured in one piece with each other and with a peripheral wall;
• the shafts being mounted between the radial walls;
• the toothed gears being arranged between the radial walls;
• one of the radial walls being a radial outer wall and the other an intermediate wall which on one side thereof defines together with the radial outer wall a gear chamber receiving the toothed gears and on the other side thereof defines a working chamber receiving the rotors;
• on an end-face facing away from the intermediate wall, the working chamber is sealed by a radial housing cover;
• the intermediate wall has axial through openings for accommodating shaft bearings having a width larger than that of the axial bearing bores in the radial outer wall;
• a side wall having an opening sealed by a removable lateral cover;
• the housing constituting a monobloc base body that has an opening at an end face facing the housing cover, said opening having a width that is the largest among said axial passages and bore holes located inside the housing, making them accessible for machining though this opening in one set-up of the base body.