Fuel injection device

摘要

A fuel injection device has a pressure accumulator (32); a pressure-blocking valve (40) which blocks outflow of pressurized fuel from a fuel injection nozzle side toward the pressure accumulator side; a fuel chamber (42) for injection control; an injection control valve (52); a pressure intensifier (54) having a cylinder (56) and a piston (58), which communicates with the fuel chamber (42) for injection control at the downstream side, relative to the pressure-blocking valve (40), of a main fuel line (36) that communicates the fuel injection nozzle with the pressure accumulator (32); and a piston control valve (60); and flow amount-changing means capable of changing flow amounts of the fuel that is flowed into the cylinder (56) or flowed out by the piston control valve (60), said flow amount-changing means being a pressure regulator (102) which is provided at an inflow path of fuel into the cylinder (56) or an outflow path of fuel from the cylinder (56).