JPH046566U

JPH046566U -

Info

Publication number: JPH046566U
Application number: JP4312290U
Authority: JP
Priority date: 1990-04-24
Filing date: 1990-04-24
Publication date: 1992-01-21

Description

[Brief explanation of drawings]

第１図はこの考案の要部を示す断面図、第２図
はこの考案に係る燃料噴射装置におけるカムアン
グルと、リフト量、燃料加圧室内の圧力および噴
射率との関係を示す図、第３図は従来の燃料噴射
装置の一例を示す断面図、第４図は従来の燃料噴
射装置における第２図と同様の図である。２……プランジヤ、５……燃料加圧室、１１…
…連通路、１３……スピル通路、２１……第１の
ストツパ部、２４……第２のストツパ部、２５…
…スピル室、２８……弁座、２９……電磁弁、３
０……第１の弁体、３２……第１のばね、３３…
…第２の弁体、３３ａ……係合部、３６……ソレ
ノイド、３７……第２のばね。 Fig. 1 is a sectional view showing the main part of this invention, Fig. 2 is a diagram showing the relationship between the cam angle, lift amount, pressure in the fuel pressurizing chamber, and injection rate in the fuel injection device according to this invention. FIG. 3 is a sectional view showing an example of a conventional fuel injection device, and FIG. 4 is a diagram similar to FIG. 2 of the conventional fuel injection device. 2...Plunger, 5...Fuel pressurization chamber, 11...
...Communication path, 13...Spill path, 21...First stopper part, 24...Second stopper part, 25...
... Spill chamber, 28 ... Valve seat, 29 ... Solenoid valve, 3
0...first valve body, 32...first spring, 33...
...Second valve body, 33a...Engaging portion, 36...Solenoid, 37...Second spring.

Claims

[Scope of utility model registration request]

A fuel pressurizing chamber in which internal fuel is pressurized by a plunger and a fuel supply passage are opened, and
In the fuel injection device, the spill chamber includes a spill chamber in which a spill passage opens to atmospheric pressure, and a solenoid valve that opens and closes a communication passage that communicates the fuel pressurizing chamber and the spill chamber. A valve seat is formed at the opening of the communication passage, and first and second stopper parts facing the valve seat are formed,
Furthermore, the spill passage is opened in the second stopper portion, and the electromagnetic valve closes the communication passage by seating on the valve seat, thereby creating a space between the fuel pressurizing chamber and the spill chamber. a first valve body that opens the communication passage and communicates the fuel pressurizing chamber and the spill chamber by opening the communication passage by blocking the fuel pressurization chamber and the spill chamber by lifting until it hits the first stopper portion; a first spring that lifts the valve body; and a second spring that slides through the first valve body in its axial direction and abuts against the second stopper portion to block the spill passage; a second valve body that engages with the first valve body and moves toward the valve seat side together with the first valve body when the second valve body moves a predetermined distance toward the valve seat side from a state where it abuts against the stopper portion of the second valve body; a second spring having a weaker biasing force than the first spring and biasing the second valve body from the valve seat side toward the second stopper portion; and a solenoid that moves the second valve element from the second stopper side toward the valve seat side.