| 摘要 |
An automotive volumetric vacuum pump (10) is being oil-lubricated and is used for providing an actuation vacuum of less than 100 mbar. The pump comprises: A rotor (20) with a circular rotor body (21) being provided with an oil receiving cavity (24) and rotating inside a pump room (15) which is surrounded by a circumferential pump room wall (12). The rotor body (20) is arranged adjacent to the pump room wall (12). A vane (30) with a longitudinal vane body (31) being arranged radially shiftable in a radial guiding slot (22) of the rotor body (20), whereby the rotor body (20), the vane (30) and the pump room wall (12) define at least two rotating pump chambers (15', 15", 15"'). A radial oil discharge channel (34;40;50) at the radial end portion (33) of the vane (30) and/or at the guiding slot (22), whereby the oil discharge channel (34) is provided with a flow opening (37;47;57) in a radial plane. The flow opening (37;47;57) is arranged to be open to thereby allow a oil to flow from the pump chamber (15') through the discharge channel (34;40;50) to the oil receiving cavity (24) only in the retracted position of the vane end portion (33) during the final compression phase of the respective rotating pump chamber (15'). |
