Patent ID: 7707911

Claim:
A dual clutch transmission, comprising: a first clutch which is actuated by a first hydraulic cylinder; a second clutch which is actuated by a second hydraulic cylinder; a plurality of shift devices for shifting gears, each of which are actuated by a hydraulically operated cylinder; and a hydraulic energy source for supplying the first hydraulic cylinder, the second hydraulic cylinder and each hydraulically operated cylinder for the plurality of shifting devices with hydraulic energy, wherein the hydraulic energy source has a first pump, a second pump and an electric drive driving only the second pump, and a line from the second pump is only connected to a line from the first pump, and wherein a first check valve is arranged in the line directly downstream of the first pump and a second check valve is arranged in the line downstream of the second pump, directly before a connection of the line from the second pump and the line from the first pump.