JPH0368560U - - Google Patents

Description

[Brief explanation of drawings]

Fig. 1 is a model diagram for explaining the main parts of the fuel injection device according to the embodiment of the present invention, Fig. 2 is an exploded view of the main parts shown in Fig. 1, and Fig. 3 is the main parts shown in Fig. 1. Figure 4 is a developed view of the main parts shown in Figure 3, and Figure 5 is a diagram showing the characteristics of the main parts shown in Figure 1. , Fig. 6 is a model diagram equivalent to Fig. 1 showing a modification of the main part of the embodiment of the invention, Fig. 7 is a developed view equivalent to Fig. 2 showing an example of the field of the embodiment of the invention, and Fig. 8 is a A perspective view of the main parts showing an example of the conventional fuel injection king value, Fig. 9 is a model diagram equivalent to Fig. 3 for explaining the action of the main parts shown in Fig. 8, and Fig. 10 is the same as Fig. FIG. 3 is a diagram showing the characteristics of the main parts shown. 1...Plunger, 1A...Plunger lead, 1B...Pilot injection lead, 2...Plunger barrel, 3...Control sleeve, 2
A, 3A... Spill port, 2B, 3B... Spill port for pilot injection.

Claims (1)

[Claims for Utility Model Registration] 1. A part of the plunger barrel into which the fuel pressure-feeding plunger is fitted is divided to form a sleeve that can be moved in the axial direction of the plunger, and this sleeve is provided with a sleeve on the circumference of the plunger. The fuel relief hole is formed to face the main injection fuel metering plunger lead formed in the main injection fuel metering lead, and the pre-stroke relative to the plunger lead can be changed by displacing the sleeve in the direction of movement of the plunger. In the fuel injection device, the plunger is formed with a pilot injection lead consisting of a notched groove that communicates with the fuel relief part in the sleeve earlier than the plunger lead in the direction in which the plunger moves for pumping fuel. At the same time, on the sleeve side, in addition to the fuel relief hole, a fuel relief portion inside the plunger is located at a position different in phase on the side opposite to the fuel relief hole in the direction of movement of the plunger during pumping of fuel. A pilot injection fuel relief hole is formed opposite to the pilot injection lead before the plunger lead reaches the fuel relief hole in a state where the plunger lead is blocked inside, and before the plunger lead faces the fuel relief hole. 1. A fuel injection device having a structure characterized in that the fuel injection device performs pilot injection of fuel. 2. A fuel injection device having a structure in which a plunger barrel into which a fuel pressure-feeding plunger is fitted has a fuel relief hole that faces a plunger lead for main injection fuel metering formed on the circumference of the plunger. The plunger is formed with a pilot injection lead consisting of a notched groove that communicates with the fuel relief portion on the plunger barrel side earlier than the plunger lead in the direction in which the plunger moves for pumping fuel, On the plunger barrel side, in addition to the fuel relief hole, a fuel relief part in the plunger is located at a different phase in the sleeve on the side opposite to the fuel relief hole in the direction of movement of the plunger when pumping fuel. forming a pilot injection fuel relief hole facing the pilot injection lead before the plunger lead reaches the fuel relief hole in the blocked state;
A fuel injection device having a structure characterized in that a pilot injection of fuel is performed before the plunger lead faces the fuel relief hole. 3. In the fuel injection device according to claim 1, the pilot injection lead formed on the plunger side is set in a longitudinal direction parallel to the radial direction on the circumferential surface of the plunger, and the pilot injection fuel relief hole on the sleeve side is provided. A fuel injection device having a structure characterized in that a plurality of pilot injection relief holes are arranged parallel to the longitudinal direction of the pilot injection lead with the same diameter as or less than the diameter of the pilot injection lead.