Internal combustion engine, injector for fuel injection system of Diesel engine of especially direct injection type

摘要

As for this invention, the internal combustion engine, being the injector for the fuel injection system of the Diesel engine of especially direct injection type, the injector body (10) the piezo actuator which is arranged inside (16) to be provided, the said piezo actuator (16) through 1st spring expedient (35), with one end the injector body (10), the conversion piston of sleeve condition (33) apply in the other edge and being attached and be kept, the injector body (10) be connected, the nozzle body which one nozzle outflow opening (26,27) it has at least (20) to be provided, the said nozzle body (20) inside, was joggled (the 1st) nozzle needle (21) with axial direction sliding possibly to be guided, the conversion piston (33) the 2nd spring expedient which is arranged inside (54) is provided, the said 2nd spring expedient (54), (the 1st) nozzle needle (21) goes hand in hand with the injection pressure which operates from the back, (the 1st) nozzle needle (21) we have kept in closed position, at the same time the conversion piston (33) it was formed to the end of nozzle needle side () the control room outside(47) to be provided, the said control room (47), through one leak gap at least, the fuel supply section which under injection pressure is (18) we to be connected, open direction (55) with we be loaded (1st) the nozzle needle (21), the control room (47) by the fuel which exists inside, at the same time (1st) the nozzle needle (21) having, (1st) the nozzle needle (21) the territory the back which possesses bigger diameter than the territory of nozzle outflow section side (31) with, the conversion piston(33) the inner room (32) it regards those of the type which entrance is done inside. Main feature was joggled the 1st nozzle needle (21), the step section (38) by the concentric axial direction notch which is consistent (39) has possessed, the 2nd nozzle needle which is joggled fit said axial direction notch (39) inside, after all the step section (40) by (41) sliding entrance to be possibly done with axial direction, the axial direction notch (39) inside, the said axial direction notch (39) the step section (38) with, the 2nd nozzle needle (41) the step section (40) withBetween, (the control room of the 2nd) inside (52) is formed, the area to which the control room inside the said (52), (the 1st) control room outside the description above (47) the liquid is connected pressure, is loaded control room capacity and the nozzle needle (21,41), control room pressure or the fuel supply section (18,19) by pressure or spring expedient pressure being adjusted mutually, approximately phase doing both nozzle needle (21,41), the piezo actuator (16) with the modification of the voltage which is impressed way it is opened,There is a point which has become.