Patent ID: 9366256
Filing Date: 2016-06-14
CPC Classification: F01C,F04C

Claim Text:
1. An oil-lubricated automotive volumetric vacuum pump for providing an actuation vacuum of less than 100 mbar, the oil-lubricated automotive volumetric vacuum pump comprising: a circumferential pump room wall arranged to surround a pump room; a rotor comprising a circular rotor body which comprises an oil receiving cavity and a radial guiding slot, the circular rotor body being arranged adjacent to the pump room wall, the rotor being configured to rotate inside the pump room; a vane comprising a longitudinal vane body and a radial vane end portion, the vane being arranged so as to be radially shiftable in the radial guiding slot of the circular rotor body, the circular rotor body, the vane, and the circumferential pump room wall defining at least two rotating pump chambers, a radial oil discharge channel arranged at least one of the radial vane end portion of the vane and at the radial guiding slot of the circular rotor body, the radial oil discharge channel comprising a flow opening in a radial plane, the flow opening being arranged to be open so as to allow an oil to flow from one of the at least two rotating pump chambers through the radial oil discharge channel to the oil receiving cavity only in a retracted position of the radial vane end portion during a final compression phase of the respective one of the at least two rotating pump chambers.