Patent ID: 7082760

Claim:
A drive system for a vehicle with at least two hydraulic motors ( 1 , 2 ) connected with a summing transmission gearset so that torque from the at least two hydraulic motors is summed together for driving a drive output shaft ( 22 ), the at least two hydraulic motors ( 1 , 2 ) each having a plurality of cylinders and associated pistons, and the summing transmission gearset and the at least two hydraulic motors ( 1 , 2 ) are accommodated within a transmission housing ( 3 ); wherein each of the at least two hydraulic motors ( 1 , 2 ) is connected to and drives a respective crankshaft ( 6 , 9 ) which forms an output thereof, and a pressure medium feed ( 37 , 38 ), for adjusting a stroke volume of the plurality of cylinders of the at least two hydraulic motors ( 1 , 2 ), is located adjacent one end of respective crankshaft ( 6 , 9 ).