Drive means with a combustion motor and a loss of heat-using expansion machine

The invention relates to a drive device with an internal combustion engine (2), and one with a couplable with the drive train of the drive device or coupled expansion machine (22, 30) which is arranged in a closed vapor cycle, and the working medium by the operation of the engine (2) heat losses is evaporated. According to the invention it is provided that the expansion machine (22) with a rotating during operation of the drive means element of the internal combustion engine (2) downstream gear arrangement (4) can be coupled or coupled. In this way, the existing infrastructure of the transmission assembly (4) for the integration of the expander (22) is used, since there are several rotating gear elements available for coupling the expander. In a preferred embodiment, the expansion machine (30) via a clutch (32) and a gear pairing (52, 50) coupled to a Nebenabtriebswellle (48), which in turn is drivingly connected to the primary side of the starting element.