Dual fuel injection valve

摘要

A dual fuel injection valve with concentric needles comprises an inner needle and an outer needle surrounding the inner needle, both needles being located inside the injection valve body. The valve is provided with a first set and a second set of orifices for separately injecting two different fuels directly into the combustion chamber of an internal combustion engine. The outer needle is fixed against rotation with respect to the injection valve body such that an interlace angle between the centerlines of the first series of orifices and second series of orifices is set at different predetermined angles to reduce methane emissions.

主权项

1. A dual fuel injection valve for separately injecting two different fuels into a combustion chamber of an internal combustion engine comprising:
(a) a valve body; (b) a hollow outer needle disposed within said valve body, said outer needle having a longitudinal axis along which it is movable between a closed position and an open position for injecting a first fuel directly into said combustion chamber through a first series of orifices located at an end of said valve body which faces said combustion chamber; (c) an inner needle disposed within said outer needle, said inner needle having a longitudinal axis along which it is movable between a closed position and an open position for injecting a second fuel directly into said combustion chamber through a second series of orifices located at an end of said outer needle which faces said combustion chamber; (d) an actuator assembly operative to move said inner needle and said outer needle between their respective closed and open positions to separately inject an amount of pilot fuel and an amount of gaseous fuel into said combustion chamber, and (e) a keying member disposed between said outer needle and said valve body in an elongated channel formed by a recess in one of an outer surface of said outer needle and an inner surface of said valve body, said keying member being held in a fixed radial position relative to said elongated channel to inhibit said outer needle from rotating relative to said valve body.