Patent ID: 6579070
Filing Date: 2003-06-17
Classification: F01C,F04C

Abstract:
A pump assembly comprising a vane pump (10), a suction region in which first pressure spaces (27) between vanes (24) and second rear pressure spaces (28) behind the vanes (24) become larger and a pressure region in which the pressure spaces (27, 28) become smaller and in which the pressure spaces (27, 28) are fluidically connected to a pressure outlet (62, 63), and a second hydraulic pump (40) which is driven together with the vane pump (10) and displacement elements (65, 66) of which are positively driven and supply a circuit having a low system pressure with the pressure fluid via a second pressure outlet (69, 70), wherein the rear pressure spaces (28) of the vane pump (10) are connected in the suction region to the pressure outlet (69, 70) of the second hydraulic pump (40).