Patent ID: 8627907

Claim:
A steering drive system for a skid steer vehicle, comprising: a drive arrangement having a first drive and a second drive; a summing gear unit having a first input shaft, a second input shaft, and an output shaft, the summing gear unit summing respective drive torques of the first and second drives on the output shaft; a first drive connection device drivingly connecting the first drive to the first input shaft of the summing gear unit; and a second drive connection device drivingly connecting the second drive to the second input shaft of the summing gear unit, wherein each of the first and second drive connection devices is configured such that driving torque directed toward the first and second drives from the summing gear unit is prevented from being transmitted to the first and second drives during a continuously produced drive connection between the first and second drives and the summing gear unit, wherein the first and second drive connection devices are self-locking for driving torques directed from the summing gear unit to the first and second drives.