Automotive vacuum pump

Abstract

An automotive vacuum pump includes a housing arrangement which encloses a pumping chamber and which rotatably supports a pump rotor having a rotor body with a bearing section and a vane section. The vane section of the rotor body has a vane slit. A slidable pump vane is supported in the vane slit. The slidable pump vane separates the pumping chamber into a plurality of rotating pumping compartments. The housing arrangement has a pumping chamber gas inlet opening and a pumping chamber gas outlet opening. The rotor body further has a separate oil outlet opening which is open to the pumping chamber

What is claimed is: 
     
         1 - 8 . (canceled) 
     
     
         9 . An automotive vacuum pump comprising:
 a housing arrangement configured to enclose a pumping chamber and to rotatably support a pump rotor comprising a rotor body which comprises a bearing section and a vane section,   wherein,   the vane section of the rotor body comprises a vane slit,   a slidable pump vane is supported in the vane slit, the slidable pump vane being configured to separate the pumping chamber into a plurality of rotating pumping compartments,   the housing arrangement comprises a pumping chamber gas inlet opening and a pumping chamber gas outlet opening, and   the rotor body further comprises a separate oil outlet opening which is open to the pumping chamber.   
     
     
         10 . The automotive vacuum pump as recited in  claim 9 , wherein,
 the rotor body further comprises a longitudinal cylindrical vane section, and   the separate oil outlet opening is arranged in the longitudinal cylindrical vane section of the rotor body.   
     
     
         11 . The automotive vacuum pump as recited in  claim 9 , wherein,
 the pumping chamber is covered by two front end walls which are each arranged to lie in a radial plane, and   the separate oil outlet opening is arranged adjacent to one of the two front end walls.   
     
     
         12 . The automotive vacuum pump as recited in  claim 9 , wherein,
 the separate oil outlet opening is arranged in a lagging third or in a lagging fourth of a respective rotating pumping compartment.   
     
     
         13 . The automotive vacuum pump as recited in  claim 9 , further comprising:
 a gas-tight commutation sector arranged between the pumping chamber gas outlet opening and the pumping chamber gas inlet opening, the gas-tight commutation sector comprising a commutation sector angle,   wherein,   the separate oil outlet opening comprises a separate oil outlet opening angle,   the commutation sector angle is larger than the separate oil outlet opening angle, and   each of the commutation sector angle and the separate oil outlet opening angle are seen from a center of the rotor body perpendicular to an axis of rotation of the rotor body.   
     
     
         14 . The automotive vacuum pump as recited in  claim 9 , wherein,
 the pump rotor further comprises a coupling structure arranged at an axial coupling end of the rotor body, and   the rotor body further comprises an oil duct which fluidically connects the separate oil outlet opening to the axial coupling end.   
     
     
         15 . The automotive vacuum pump as recited in  claim 14 , wherein,
 the axial coupling end comprises an oil discharge opening which is fluidically connected to the separate oil outlet opening, and   the oil discharge opening comprises a check-valve.   
     
     
         16 . The automotive vacuum pump as recited in  claim 9 , wherein,
 one slidable pump vane comprising one vane body is supported in the vane slit which is configured to radially penetrate the rotor body, and   the rotor body comprises two separate oil outlet openings, one of the separate oil outlet openings being arranged in each rotating pumping compartment.