LUBRICANT VANE PUMP

摘要

The present invention refers to a lubricant vane pump (10) for providing pressurized lubricant for an internal combustion engine. The lubricant vane pump (10) is provided with a pump housing (12) with a pump rotor (30), whereby the pump rotor (30) is provided with radially slidable vanes (32) rotating in a shiftable control ring (28) which envelopes a pump chamber ( 18) with numerous rotating pump compartments (191 - 197) rotating from a charge zone (22) to a discharge zone (24). A pretensioning element (74) is pushing the control ring (28) to a high pumping volume direction. High lubricant pressure in a control chamber (54) causes the control ring (28) to be moved to a low pumping volume direction against the pretensioning element (74). A pump outlet cavity (14) is connected fluidically to the control chamber (54). The control ring (28) is provided with a pressure-relief-valve (52, 52') integrated into the control ring (28) and connecting or disconnecting the control chamber (54) with the pump compartment (191) between the charge zone (22) and the discharge zone (24) under defined connection conditions.