Abstract: The present invention relates to a two-stage fuel injection valve. The two-stage fuel injection valve of the present invention is configured such that the pressure of main fuel delivered from an injection pump is applied to a plunger in a main fuel chamber, and subsequently delivered to an ancillary fuel pressure chamber via the plunger so as to compress ancillary fuel, such that a needle is retracted in a manner similar to those of slide valves by means of the pressure of the ancillary fuel so as to open an ancillary fuel nozzle hole and inject the ancillary fuel, and a main fuel nozzle hole is opened after the injection of the ancillary fuel so as to inject the main fuel, thereby conducting two-stage fuel injection.

Abstract: The injection system of a fuel injection pump is provided. In the injection system of a fuel injection pump, a plunger performs a reciprocating slide motion in the axial direction inside of the plunger chamber of a barrel for compressing fuel. The plunger has a release groove and a control edge. A spill port is formed in the wall surface of the barrel. A damping groove is formed in the upper-part outer circumference of the control edge and provides a fine fuel flow path. The damping groove meets the spill port in advance to form the fine flow of fuel from the plunger chamber to the spill port before the control edge of the plunger meets the spill port to release pressure.

Abstract: The present invention relates to a two-stage fuel injection valve. The two-stage fuel injection valve of the present invention is configured such that the pressure of main fuel delivered from an injection pump is applied to a plunger in a main fuel chamber, and subsequently delivered to an ancillary fuel pressure chamber via the plunger so as to compress ancillary fuel, such that a needle is retracted in a manner similar to those of slide valves by means of the pressure of the ancillary fuel so as to open an ancillary fuel nozzle hole and inject the ancillary fuel, and a main fuel nozzle hole is opened after the injection of the ancillary fuel so as to inject the main fuel, thereby conducting two-stage fuel injection.

Abstract: The injection system of a fuel injection pump is provided. In the injection system of a fuel injection pump, a plunger performs a reciprocating slide motion in the axial direction inside of the plunger chamber of a barrel for compressing fuel. The plunger has a release groove and a control edge. A spill port is formed in the wall surface of the barrel. A damping groove is formed in the upper-part outer circumference of the control edge and provides a fine fuel flow path. The damping groove meets the spill port in advance to form the fine flow of fuel from the plunger chamber to the spill port before the control edge of the plunger meets the spill port to release pressure.