JPS5990070U

JPS5990070U - unit injector

Info

Publication number: JPS5990070U
Application number: JP18568882U
Authority: JP
Inventors: 博通三輪
Original assignee: 日産自動車株式会社
Priority date: 1982-12-07
Filing date: 1982-12-07
Publication date: 1984-06-18

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は従来のユニットインジェクタの一例を示す説明
図、第２図は第１図の要部拡大図、第３図はこの考案に
揉るユニットインジェクタの一実施例を示す断面図、第
４図は同じくこの考案の他の実施例を示す断面図である
。２０・・・インジェクタ本体、２１−・・ピストン、２
２・・・シリンダ、２３・・・プランジャ、２４・・・
バレル、２６・・・圧力室、２７・・・制御圧力室、３
１・・・ニードル室、３２・・・ニードル弁、３４・・
・噴口、３５・・・ニードルスプリング、３６・・・ス
プールシリンダ、′３７・・・スプール弁、３８・・・
電磁制御弁。Fig. 1 is an explanatory diagram showing an example of a conventional unit injector, Fig. 2 is an enlarged view of the main part of Fig. 1, Fig. 3 is a sectional view showing an embodiment of a unit injector based on this invention, and Fig. The figure is a sectional view showing another embodiment of this invention. 20... Injector body, 21-... Piston, 2
2...Cylinder, 23...Plunger, 24...
Barrel, 26... Pressure chamber, 27... Control pressure chamber, 3
1... Needle chamber, 32... Needle valve, 34...
・Nozzle port, 35... Needle spring, 36... Spool cylinder, '37... Spool valve, 38...
Solenoid control valve.

Claims

[Scope of utility model registration request]

A piston that is driven in synchronization with the engine by a predetermined cam mechanism and reciprocates within the cylinder, a plunger that integrally moves with this piston and reciprocates within the barrel, and the reciprocating motion of the piston generates pressure within the control pressure chamber. a spool valve that receives pressure at one end and reciprocates within a spool cylinder to open and shut off the pressure generated within the pressure chamber due to the reciprocating movement of the plunger; and an electromagnetic control valve that releases the pressure generated within the control pressure chamber. A unit injector characterized by comprising a needle valve which is always biased in a valve closing direction by a spring and which opens and closes an injection port in accordance with the pressure generated in the pressure chamber.