Dual-fuel fuel injector

Abstract

The invention relates to a dual-fuel fuel injector (1), having: a first nozzle needle (5), which can be controlled in terms of axial stroke, for the discharge of liquid fuel via a first nozzle arrangement (21) of the dual-fuel fuel injector (1); a multiplicity of second nozzle needles (45), which are arranged around the first nozzle needle (5) and which can be controlled in terms of axial stroke, for the discharge of gaseous fuel via a second nozzle arrangement (47) of the dual-fuel fuel injector (1); wherein, for each of the second nozzle needles (45), for the control of the stroke thereof, a respective control chamber (59) which can be charged with and relieved of pressure by way of a control fluid is provided in the injector (1); wherein the dual-fuel fuel injector (1) furthermore has an annular duct (65) which can be charged with and relieved of pressure by way of the control fluid; the dual-fuel fuel injector (1) is designed such that, for the control of the stroke of the second nozzle needles (45), the control chambers (59) for the second nozzle needles (45) are charged with and relieved of pressure by way of the control fluid proceeding from the annular duct (65).

Description

technical field [0001] The invention relates to a dual fuel injector according to the preamble of claim 1 . Background technique [0002] A cylinder head for a piston internal combustion engine is known from DE 35 01 236 C1, wherein the cylinder head has a central injection nozzle and at least two peripheral injection nozzles. [0003] Gaseous fuels are gaining increasing significance in the field of large engines, especially in stationary engines for power generation. Natural gas is particularly suitable for economical and environmentally friendly engine operation due to its very good usability compared to diesel and its more favorable emission potential. Most gas engines operate according to the Otto process, ie have homogeneous combustion and external ignition, where ignition is accomplished either by a glow plug or a diesel ignition injector. However, the process of the Otto engine has a drawback that, during load changes, an undesired leakage of methane occurs due to ...

AI Technical Summary

Problems solved by technology

[0005] Despite the various variations, the installation space conditions in the nozzle body are always extremely narrow and are therefore unfavorable for the production in terms of the costs to be paid for the production of the nozzle.

Images