Patent ID: 6952981

Claim:
A hydrodynamic 2-speed hydraulic drive for application in under-floor drive systems on rail vehicles with a low-floor part, comprising: a drive input shaft ( 11 ) and a drive output shaft ( 12 ); two hydrodynamic components for formation of two tractive-work circuits for two different speed ranges including a first hydrodynamic component in a form of a hydrodynamic speed-torque converter ( 3 ) and a second hydrodynamic component in a form of a hydrodynamic clutch ( 4 ); a step-up gear set coupled with the drive input shaft ( 11 ) for driving the hydrodynamic speed-torque converter ( 3 ) and the hydrodynamic clutch ( 4 ); the hydrodynamic speed-torque converter ( 3 ) being connected with the drive output shaft ( 12 ) by means of a reverse gear set ( 22 ); the hydrodynamic speed-torque converter ( 3 ) and the hydrodynamic clutch ( 4 ) being arranged parallel to each other and with generally no offset when considered in the axial direction between the drive input shaft ( 11 ) and the drive output shaft ( 12 ); the hydrodynamic speed-torque converter ( 3 ) comprising at least one pump wheel ( 5 ) locked with a first primary shaft ( 18 ) and one hydraulic wheel ( 6 ) locked with a first secondary shaft ( 20 ) and a guide wheel ( 7 ); the hydrodynamic clutch ( 4 ) comprising a pump wheel ( 8 ) locked with a second primary shaft ( 19 ) and a hydraulic wheel ( 9 ) locked with a second secondary shaft ( 21 ); a hydrodynamic brake mechanism in a form of a hydrodynamic retarder ( 35 ); the hydrodynamic retarder ( 35 ) arranged in a gearbox case ( 38 ) without changing the length of the case, that is without any influence on an axial location of a drive flange ( 45 ) coupled with the drive output shaft ( 12 ); the hydrodynamic clutch ( 4 ) being connected with the drive output shaft ( 12 ) by means of the reverse gear set ( 22 ); the secondary shafts ( 20 , 21 ) connected with the reverse gear set ( 22 ), whereby the first secondary shaft ( 20 ) is connected by means of at least one connecting spur gear ( 25 ) with the reverse gear set ( 22 ) and the second secondary shaft is directly coupled with the reverse gear set ( 22 ); the hydrodynamic retarder in coaxial arrangement to the hydrodynamic speed-torque converter.