DUAL-FUEL INJECTOR

According to the present invention there is provided a dual-fuel injector for injecting two separate fuels into a combustion chamber of an internal combustion engine. The dual-fuel injector comprises a nozzle body housing a first fuel needle valve and a second fuel needle valve. The dual-fuel injector further comprises a first fuel control chamber defined at least in part by an upper end of the first fuel needle valve such that varying a first pressure in the first fuel control chamber varies the force on the upper end of the first fuel needle valve. Further, the dual-fuel injector comprises a second fuel control chamber defined at least in part by an upper end of the second fuel needle valve such that varying a second pressure in the second fuel control chamber varies the force on the upper end of the second fuel needle valve. The dual-fuel injector comprises a first fuel control valve defining a first switching volume fluidly coupled to the first fuel control chamber for actuating the first fuel needle valve, and a second fuel control valve defining a second switching volume fluidly coupled to the second fuel control chamber for actuating the second fuel needle valve. The dual-fuel injector further includes an annular hydraulic sealing gallery extending around an outer surface of the first fuel needle valve. The annular hydraulic sealing gallery is fluidly coupled to a source of high-pressure fluid. Additionally, the annular hydraulic sealing gallery is fluidly coupled to at least one of the first switching volume and/or the second switching volume such that the respective switching volume is fluidly coupled to the source of high-pressure fluid via the sealing gallery. La présente invention concerne un injecteur bicarburant permettant d'injecter deux carburants séparés dans une chambre de combustion d'un moteur à combustion interne. L'injecteur bicarburant comprend un corps de buse logeant un premier robinet à pointeau de carburant et un second robinet à pointeau de carburant. L'injecteur bicarburant comprend en outre une première chambre de commande de carburant délimitée au moins en partie par une extrémité supérieure du premier robinet à pointeau de carburant de telle sorte que la variation d'une première pression dans la première chambre de commande de carburant fait varier la force sur l'extrémité supérieure du premier robinet à pointeau de carburant. En outre, l'injecteur bicarburant comprend une seconde chambre de commande de carburant délimitée a