Fuel injector of an internal combustion engine and internal combustion engine

Patent metadata

Field	Value
Publication number	US-2025382925-A1
Application number	US-202519226712-A
Country	US
Kind code	A1
Filing date	Jun 3, 2025
Priority date	Jun 12, 2024
Publication date	Dec 18, 2025
Grant date	—

Abstract

Fuel injector for supplying fuel to a combustion chamber of a cylinder, having a first nozzle needle guided in a first nozzle guide, which interacts with first fuel injection orifices such that the first nozzle needle either opens or blocks a fuel flow of a first fuel through the first fuel injection orifices, a second nozzle needle guided in a second needle guide, which interacts with second fuel injection orifices such that the second nozzle needle, either opens or blocks a fuel flow of a second fuel through the second fuel injection orifices, a first fuel storage space for the first fuel, and a second fuel storage space for the second fuel me. The first and second fuel storage spaces are arranged next to one another in the transverse or radial direction of the fuel injector and overlap in the longitudinal or axial direction of the fuel injector.

First claim

1 . A fuel injector of an internal combustion engine, configured to supply fuel to a combustion chamber of a cylinder of the internal combustion engine, comprising:
a first nozzle needle moveably guided in a first needle guide, which interacts with first fuel injection orifices such that the first nozzle needle, dependent on its position, either opens or blocks a first fuel flow of a first fuel through the first fuel injection orifices; a second nozzle needle moveably guided in a second needle guide, which interacts with second fuel injection orifices such that the second nozzle needle, dependent on its position, either opens or blocks a second fuel flow of a second fuel through the second fuel injection orifices; at least one first fuel storage space for the first fuel integrated in the fuel injector; and at least one second fuel storage space for the second fuel integrated in the fuel injector, wherein the at least one first fuel storage space and the at least one second fuel storage space are arranged next to one another in a transverse direction or a radial direction of the fuel injector and overlap one another in a longitudinal direction or an axial direction of the fuel injector.

2 . The fuel injector according to claim 1 ,
wherein a number of the first fuel storage spaces corresponds to a number of the second fuel storage spaces.

3 . The fuel injector according to claim 1 ,
wherein a number of the first fuel storage spaces is smaller than a number of the second fuel storage spaces.

4 . The fuel injector according to claim 1 ,
wherein a diameter (D 1 ) of the at least one first fuel storage space is smaller than a diameter (D 2 ) of the at least one second fuel storage space or corresponds to the diameter of the at least one second fuel storage space.

5 . The fuel injector according to claim 4 ,
wherein the diameter of the at least one first fuel storage space is smaller than the diameter of the at least one second fuel storage space, and wherein a ratio D 2 :D 1 between the diameter (D 2 ) of the respective second fuel storage space and the diameter (D 1 ) of the respective first fuel storage space amounts to between 1.05 and 1.25.

6 . The fuel injector according to claim 1 ,
wherein a ratio X 12 :X 22 between a distance (X 12 ) between a first fuel storage space and an adjacent second fuel storage space and a distance (X 22 ) between two adjacent second fuel storage spaces amounts to between 0.75 and 1.25.

7 . The fuel injector according to claim 6 ,
wherein the ratio X 12 :X 22 amounts to between 0.75 and 0.95.

8 . The fuel injector according to claim 1 ,
wherein at least two first fuel storage spaces with different lengths are integrated in the fuel injector, and wherein a length ratio L 1 K:L 1 L between a length L 1 K of a shorter or shortest first fuel storage space and a length L 1 L of a longer or longest first fuel storage space amounts to between 0.5 and 0.95.

9 . The fuel injector according to claim 1 ,
wherein in the fuel injector at least two second fuel storage spaces with different lengths are integrated, and wherein a length ratio L 2 K:L 2 L between a length L 2 K of a shorter or shortest second fuel storage space and a length L 2 L of a longer or longest second fuel storage space amounts to between 0.5 and 0.95, preferentially to between 0.5 and 0.75.

10 . The fuel injector according to claim 1 , further comprising
a first solenoid valve configured to control the first nozzle needle; and a second solenoid valve configured to control the second nozzle needle, wherein the first and second solenoid valves are arranged in the longitudinal direction or the axial direction of the fuel injector between the fuel storage spaces and the nozzle needles.

11 . An internal combustion engine, having cylinders,
wherein each cylinder comprises a fuel injector, comprising: a first nozzle needle moveably guided in a first needle guide, which interacts with first fuel injection orifices such that the first nozzle needle, dependent on its position, either opens or blocks a first fuel flow of a first fuel through the first fuel injection orifices; a second nozzle needle moveably guided in a second needle guide, which interacts with second fuel injection orifices such that the second nozzle needle, dependent on its position, either opens or blocks a second fuel flow of a second fuel through the second fuel injection orifices; at least one first fuel storage space for the first fuel integrated in the fuel injector; and at least one second fuel storage space for the second fuel integrated in the fuel injector, wherein the at least one first fuel storage space and the at least one second fuel storage space are arranged next to one another in a transverse direction or a radial direction of the fuel injector and overlap one another in a longitudinal direction or an axial direction of the fuel injector.

12 . The fuel injector according to claim 8 ,
wherein the length ratio L 1 K:L 1 L amounts to between 0.5 and 0.75.

13 . The fuel injector according to claim 9 ,
wherein the length ratio L 2 K:L 2 L amounts to between 0.5 and 0.75.

Assignees

• Man Energy Solutions Se

Inventors

• Indrich Maximilian
• Ippy Josef

Classifications

• F02M2200/44

  Valves, e.g. injectors, with valve bodies arranged side-by-side · CPC title

• F02M2200/40

  Fuel-injection apparatus with fuel accumulators, e.g. a fuel injector having an integrated fuel accumulator · CPC title

• F02M43/04 Primary

  Injectors peculiar thereto · CPC title

• F02M2200/95

  Fuel injection apparatus operating on particular fuels, e.g. biodiesel, ethanol, mixed fuels · CPC title

• F02M2200/956

  Ethanol · CPC title