DUAL-FUEL INJECTION DEVICE, DUAL-FUEL SYSTEM, INTERNAL COMBUSTION ENGINE, AND METHOD FOR OPERATING SUCH INTERNAL COMBUSTION ENGINE

摘要

To provide a new type of dual-fuel injection device.SOLUTION: A dual-fuel injection device (6) for an internal combustion engine (1) has a first nozzle valve (7) in which a first fuel, in particular diesel, can be introduced, and second nozzle valves (9) in which a second fuel, in particular methanol, can be introduced. Nozzle guides for nozzle needles of the second nozzle valves (9) avoid leaking of the second fuel to the surroundings via the needle guides, and, can receive sealing and lubrication oil for lubricating each of the nozzle needles in the needle guides. A selector valve (18) supplies the second fuel to each needle fuel chamber of each second nozzle valve (9). The needle guide of each second nozzle valve (9) defines a needle lubrication chamber, and the needle lubrication chamber is dimensioned such that the second fuel does not enter the area of the needle lubrication chamber.SELECTED DRAWING: Figure 1