Pump assembly for synchronous pressurization of two fluid circuits

Abstract

The invention relates to a pump assembly for the synchronous pressurization of two fluid circuits. Two internal gear pumps are disposed together in a pump housing and rotationally driven by drive shafts thereof. Pinions of the pumps are located in an associated pump chamber and engage in an internal gear thereof. The pump chambers of the internal gear pumps are separated from each other by a common separating wall or partition, which is designed as a separate housing part and engages in a hollow cross-section of a housing part forming the circumferential wall of one of the internal gear pumps. Suction channels and pressure channels associated with the internal gear pumps transition into a radially extending longitudinal section in the pump housing following an axial longitudinal section in the lateral boundary wall of the associated pump chamber. According to the invention, a suction channel and a pressure channel of one of the internal gear pumps are integrated in the separating wall.

1 - 10 . (canceled) 
     
     
         11 . A pump assembly for synchronous pressurization of two fluid circuits, which pump assembly includes two internal gear pumps, disposed together in a pump housing and driven to rotate via a respective drive shaft thereof, pinions of the pumps are located in an associated pump chamber and are in toothed engagement with a respective internal gear, and the pump chambers of the internal gear pumps are partitioned off from one another by a common partition which is embodied as a separate housing part and which engages a hollow cross section of a housing part that forms the circumferential wall of one of the internal gear pumps, and suction channels and pressure channels associated with the internal gear pumps transition, after an axial longitudinal portion in a lateral boundary wall of the associated pump chamber, into a longitudinal portion that extends radially in the pump housing, the suction channel and the pressure channel of one of the internal gear pumps being integrated with the partition. 
     
     
         12 . The pump assembly as defined by  claim 11 , wherein the suction channels and the pressure channels of both internal gear pumps are integrated with the partition. 
     
     
         13 . The pump assembly as defined by  claim 11 , wherein a leakage channel, which is in fluidic communication with an outflow opening of a suction channel in the partition, is integrated with the partition. 
     
     
         14 . The pump assembly as defined by  claim 12 , wherein a leakage channel, which is in fluidic communication with an outflow opening of a suction channel in the partition, is integrated with the partition. 
     
     
         15 . The pump assembly as defined by  claim 11 , wherein each suction channel and each pressure channel of the partition is disposed in a same cross-sectional region thereof. 
     
     
         16 . The pump assembly as defined by  claim 12 , wherein each suction channel and each pressure channel of the partition is disposed in a same cross-sectional region thereof. 
     
     
         17 . The pump assembly as defined by  claim 13 , wherein each suction channel and each pressure channel of the partition is disposed in a same cross-sectional region thereof. 
     
     
         18 . The pump assembly as defined by  claim 11 , wherein a valve assembly is provided in at least one suction channel or pressure channel of the partition. 
     
     
         19 . The pump assembly as defined by  claim 12 , wherein a valve assembly is provided in at least one suction channel or pressure channel of the partition. 
     
     
         20 . The pump assembly as defined by  claim 13 , wherein a valve assembly is provided in at least one suction channel or pressure channel of the partition. 
     
     
         21 . The pump assembly as defined by  claim 18 , wherein a pressure reduction valve is disposed in each suction channel of the partition, and an overpressure valve is disposed in each pressure channel of the partition. 
     
     
         22 . The pump assembly as defined by  claim 19 , wherein a pressure reduction valve is disposed in each suction channel of the partition, and an overpressure valve is disposed in each pressure channel of the partition. 
     
     
         23 . The pump assembly as defined by  claim 11 , wherein the partition is a cylindrical disk with plane-parallel face ends, which is pressed into a cylindrical hollow cross section of an associated housing part. 
     
     
         24 . The pump assembly as defined by  claim 12 , wherein the partition is a cylindrical disk with plane-parallel face ends, which is pressed into a cylindrical hollow cross section of an associated housing part. 
     
     
         25 . The pump assembly as defined by  claim 23 , wherein the pressed-in partition is braced axially on an annular face end of the associated housing part, and on the face end thereof opposite it, an annular face end of the housing part adjoining the associated housing part is braced, and tubular end regions of the housing parts are joined together in telescoping fashion, overlapping longitudinally. 
     
     
         26 . The pump assembly as defined by  claim 24 , wherein the pressed-in partition is braced axially on an annular face end of the associated housing part, and on the face end thereof opposite it, an annular face end of the housing part adjoining the associated housing part is braced, and tubular end regions of the housing parts are joined together in telescoping fashion, overlapping longitudinally. 
     
     
         27 . The pump assembly as defined by  claim 11 , wherein wheel sets of the internal gear pumps comprised of the pinion and internal gear, on their end faces oriented toward the ends of the pump assembly, are axially acted upon by an associated thrust pad, which also includes a bearing sleeve for the drive shaft. 
     
     
         28 . The pump assembly as defined by  claim 12 , wherein wheel sets of the internal gear pumps comprised of the pinion and internal gear, on their end faces oriented toward the ends of the pump assembly, are axially acted upon by an associated thrust pad, which also includes a bearing sleeve for the drive shaft. 
     
     
         29 . The pump assembly as defined by  claim 27 , wherein the thrust pad and the bearing sleeve are plastic and are embodied in one piece. 
     
     
         30 . The pump assembly as defined by  claim 28 , wherein the thrust pad and the bearing sleeve are plastic and are embodied in one piece.