Patent ID: 6588406
Filing Date: 2003-07-08
Classification: F02D,F02M,Y02T

Abstract:
A dual fuel injector for alternatively or simultaneously feeding and metering two distinct fuels to an internal combustion engine, comprising:(a) at least one main fuel passage, (b) at least one secondary fuel passage, fluidically isolated from said main fuel passage, (c) a common valve seat, (d) an electromagnet, (e) a main fuel valve, slidably mounted between said electromagnet and said common valve seat, and said main fuel valve fluidically communicating with said main fuel passage, (f) a secondary fuel valve, slidably mounted between said electromagnet and said common valve seat, and said secondary fuel valve fluidically communicating with said secondary fuel passage, (g) means, including a main stroke limiter, for limiting the travel of said main fuel valve to a predetermined value, (h) divider means, including said stroke limiter, for isolating a volume surrounding said main fuel valve from the remainder of the space delimited by said common valve seat and said electromagnet, (i) means, including a spring, for resiliently urging said main fuel valve to a closed position against said common valve seat, providing a fluid tight seal thereat, (j) means, including a spring, for resiliently urging said secondary fuel valve to a closed position against said common valve seat, providing a fluid tight seal thereat, and (k) said electromagnet, in its energized state, simultaneously driving said main fuel valve and said secondary fuel valve in a same direction, away from said common valve seat, to an open position, thereby creating a main opening between said common valve seat and said main fuel valve and a secondary opening between said common valve seat and said secondary fuel valve, and (l) said divider means fluidically isolating said main opening from said secondary opening, (m) whereby a main fuel and a secondary fuel can flow through said main opening and said secondary opening, respectively.