Injection nozzle for a dual-fuel engine, dual-fuel engine and method for operating the same

A dual-fuel engine, comprising:

• a combustion chamber having at least one cylinder;
• and
• a fuel supply device, which for each respective cylinder comprises:
• an injection nozzle body with first injection orifices and second injection orifices;
• and
• an injection nozzle needle that is displaceably guided in the injection nozzle body and is configured as a unitary body,
• wherein:
• the first injection orifices have a smaller injection orifice cross-section than the second injection orifices;
• the first injection orifices and the second injection orifices seen in an axial direction and have a defined distance in a displacement direction of the injection nozzle needle;
• in a closing or blocking displacement direction of the injection nozzle needle configured to close or block the first injection orifices and the second injection orifices, the first injection orifices are located in front of the second injection orifices;
• in an opening or unblocking displacement direction of the injection nozzle needle configured to open or unblock the first injection orifices and the second injection orifices, the first injection orifices are located behind the second injection orifices,
• wherein:
• in a first operating mode of the dual-fuel engine, the combustion chamber can be supplied with a first fuel for combustion, and
• in a second operating mode of the dual-fuel engine the combustion chamber is supplied with a second fuel for combustion and an ignition fluid, and
• wherein a surface of the injection nozzle body facing the injection nozzle needle is a sawtooth with a peak between the first injection orifices and the second injection orifices.