Patent ID: 8172053

Claim:
A hydraulic circuit arrangement for operating a hydrodynamic torque converter ( 1 , 10 ) with a converter bridging clutch ( 11 ), the circuit arrangement comprising: a hydraulic switching unit ( 3 , 14 ) comprising at least one valve for controlling an inflow flow and a return flow of oil to the converter ( 1 , 10 ) and the converter bridging clutch ( 11 ); an oil cooler ( 4 , 15 ); the torque converter ( 1 , 10 ) being connected to the circuit arrangement only by a first line ( 5 , 12 ) and a second line ( 6 , 13 ); the first line ( 5 , 12 ) being connected to the torque converter ( 1 , 10 ) and, via the switching unit ( 3 , 14 ), to the oil cooler ( 4 , 15 ) for acting upon the converter bridging clutch ( 11 ) with an engagement pressure (P WKzu ); the second line ( 6 , 13 ) being connected to the torque converter ( 1 , 10 ) and the switching unit ( 3 , 14 ) for acting upon the converter bridging clutch ( 11 ) with a disengagement pressure (P WKauf ); and a bypass line ( 8 , 17 ) solely connected to the first line ( 5 , 12 ) such that a flow of oil between the torque converter ( 1 , 10 ) and the oil cooler ( 4 , 15 ) bypasses the hydraulic switching unit ( 3 , 14 ).