An electric, drive system for floor conveyances with one or more vehicle chassis (3; 10, 11) in active connection with one another allowing relative movement and with at least one electric, drive motor and/or an electric, steering motor, with an electric transverter associated with each of these and an electronic, control system. At least one of these electric or electronic components is designed to be cooled by a liquid and is connected via an associated cooling circuit (5; 12) to at least one cooling device.