Heat recovery system for an internal combustion engine

The invention relates to a heat recovery system (1) for an internal combustion engine (2) with a heat exchanger (3) through which a fluid heat carrier flows for transferring heat from a combustion exhaust gas (4) of the internal combustion engine (2) to the heat carrier, a heat engine (5) through which the heat carrier flows for converting the heat transferred to the heat carrier into mechanical work, an essentially cyclically closed conduit system (6) for connecting the heat exchanger to the heat engine (5), at least one displacement pump (7) for conveying the heat carrier through the conduit system (6) in a predetermined flow direction, and a pump drive for driving the displacement pump (7). Reduced wear results when the heat recovery system (1) is supplemented by an impermeable separating membrane for fluid-tight separation of the heat carrier from the pump drive.