Patent ID: 7367416

Claim:
A drive train for a motor vehicle which is driven by an internal combustion engine, having: a first single friction clutch which has an input element and an output element, wherein the input element is to be connected to a crankshaft of the internal combustion engine; a step-by-step variable speed transmission which has an input shaft, a multiplicity of wheel sets corresponding to a multiplicity of gear speeds, and an output shaft, wherein the input shaft is connected to the output element of the first clutch; and an electric machine configured to be connected via a second clutch to the output shaft of the step-by-step variable speed transmission in order to be able to apply traction force to the output shaft of the step-by-step variable speed transmission independently of whether the first clutch is opened or closed, and configured as a starter generator when connected via a third clutch to the crankshaft in order to start the internal combustion engine or be driven by the internal combustion engine; wherein the electric machine can be rotationally coupled to the crankshaft while bypassing the first clutch so as to start the internal combustion engine or be driven by the internal combustion engine when the first clutch is opened.