Patent ID: 8661941

Claim:
A hybrid drive system with a first drive means and second drive means for driving a transmission output shaft of a transmission for a motor vehicle, the hybrid drive system comprising: a first shiftable partial transmission with a first main shaft, which is connectable to an intermediate shaft by means of a first group of shiftable gear pairs, the first drive means connectable to the first main shaft of the first shiftable partial transmission; and a second shiftable partial transmission with a second main shaft, which is connectable to the intermediate shaft, by means of a second group of shiftable gear pairs; wherein at least one shiftable gear pair of the first shiftable partial transmission is formed by two shiftable idlers, a first of the two shiftable idlers is connectable to the first main shaft via a first shifting element, and a second of the two shiftable idlers is connectable to the intermediate shaft via a second shifting element; and at least one of the two shiftable idlers is arranged in each possible power path from the second drive means to the first main shaft, the second main shaft and the intermediate shaft.