Patent ID: 7225996

Claim:
A fuel injection device including a fuel injection unit and a fuel supply system supplying fuel to the fuel injection unit, the fuel injection unit comprising: a plurality of fuel injection members including a first fuel injection member disposed in a center of the fuel injection unit and an annular second fuel injection member surrounding the first fuel injection member, each of the fuel injection members having a port through which fuel is injected; an atomizing mechanism configured to atomize fuel which is injected from the fuel injection members; and a mixing duct surrounding the fuel injection members and the atomizing mechanism, wherein annular air passages for combustion air are formed between the first fuel injection member and the annular second fuel injection member, and between the annular second injection member and the mixing duct, so that fuel is atomized and mixed with the combustion air flowing through the annular air passages by means of the atomizing mechanism, the fuel supply system comprising: a holding-and-supplying unit configured to hold the fuel injection unit and supply fuel to each of the fuel injection members of the fuel injection unit; and a connecting-and-supplying unit configured to connect the plurality of fuel injection members to the holding-and-supplying unit, wherein fuel supply passages are formed in the holding-and-supplying unit and the connecting-and-supplying unit so as to extend from the holding-and-supplying unit through the connecting-and-supplying unit to the fuel injection members, wherein the fuel supply passages of the holding-and-supplying unit and the connecting-and-supplying unit are connected to teach other via a connecting piece having a hollow cylinder shape, the connecting piece being fitted in a liquid-tight fashion into recesses respectively formed in joining surfaces of the holding-and-supplying unit and the connecting-and-supplying unit, wherein the connecting-and-supplying unit includes a cylindrical member disposed in a center of the connecting-and-supplying unit and having a front end joined to the first fuel injection member, an annular member concentrically surrounding the cylindrical member and having a front end joined to the second fuel injection member, a plate-shaped first connecting member connecting the annular member to the holding-and-supplying unit, a second connecting member connecting the cylindrical member and the annular member to each other, and a mixing duct holding member holding the mixing duct on the annular member, all of the cylindrical member, the annular member, the plate-shaped first connecting member, the second connecting member, and the mixing duct holding member being integrally formed.