Patent ID: 7837453

Claim:
A device ( 1 ) for driving an oil pump ( 2 ) of a transmission of a motor vehicle, the device comprising: a transmission housing ( 3 ); a pump housing ( 4 ); a pump shaft ( 8 ); and a gear shaft ( 13 ) with a gear wheel ( 14 ), the gear shaft ( 13 ) being fixedly connected with the pump shaft ( 8 ) and being supported within the transmission housing ( 3 ) as part of a gear stage, and the gear shaft ( 13 ) being rotationally supported by bearings located on opposite sides of the gear wheel ( 14 ), wherein the pump housing ( 4 ) is supported in the transmission housing ( 3 ), the gear shaft ( 13 ) is supported by a first bearing ( 15 ) which is supported by the transmission housing ( 3 ), the gear shaft ( 13 ) is supported by a second bearing ( 16 ) which is supported by the pump housing ( 4 ), a pump side of the gear shaft ( 13 ) is a hollow shaft ( 13 a ) and the pump shaft ( 8 ) extends inside the hollow shaft ( 13 a ) of the gear shaft ( 13 ), the pump housing ( 4 ) has a bearing bore ( 4 c ) and the hollow shaft ( 13 a ) of the gear shaft ( 13 ) is supported within the bearing bore ( 4 c ), the pump shaft ( 8 , 8 a ) is coupled to the hollow shaft ( 13 a ) by one of positive locking and friction force locking, wherein the pump housing ( 4 ) has an open circular end face ( 4 b ) which communicates with and is sealed against a flat surface ( 6 ) of the transmission housing ( 3 ), and the oil pump ( 2 ) includes a pump rotor ( 9 , 10 ) located in the pump housing and driven by the pump shaft ( 8 , 8 a ) and communicating with a suction chamber ( 11 ) and a pressure chamber ( 12 ) located within the transmission housing ( 3 ) through the open circular end face ( 4 b ) of the pump housing ( 4 ).