JPS58151352U

JPS58151352U - internal combustion engine fuel injection pump

Info

Publication number: JPS58151352U
Application number: JP4813582U
Authority: JP
Inventors: 斉藤　正昭
Original assignee: 日産自動車株式会社
Priority date: 1982-04-05
Filing date: 1982-04-05
Publication date: 1983-10-11
Also published as: JPS6327091Y2

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図は従来例の断面図、第２図は本考案の一実施例を
示す燃料噴射ポンプ全体の断面図、第３図は第２図の要
部の断面図、第４図及び第５図はそれぞれ本考案の他の
実施例を示す要部の断面図である。２６・・・高圧室、２７・・・プランジャバレル、２８
・・・プランジャ、３２・・・燃料通路、３３・・・リ
セス部、３７・・・副通路、３８・・・主通路、３９・
・・吐出弁、４０・・・オリフィス、４１・・・制御ピ
ストン、４２・・・吐出通路、４３・・・スプリング、
４６・・・ソレノイド。Fig. 1 is a sectional view of a conventional example, Fig. 2 is a sectional view of the entire fuel injection pump showing an embodiment of the present invention, Fig. 3 is a sectional view of the main parts of Fig. 2, and Figs. Each figure is a sectional view of a main part showing other embodiments of the present invention. 26... High pressure chamber, 27... Plunger barrel, 28
... Plunger, 32... Fuel passage, 33... Recessed portion, 37... Sub-passage, 38... Main passage, 39...
...Discharge valve, 40... Orifice, 41... Control piston, 42... Discharge passage, 43... Spring,
46...Solenoid.

Claims

[Scope of utility model registration request]

(1) A plunger that reciprocates in synchronization with the rotation of the crankshaft, a high-pressure chamber that introduces and compresses fuel by the reciprocating movement of the plunger, and a sub-passage that has a large flow rate restriction for pressure feeding.
The main passage, which has a small pressure flow rate restriction, is communicated with the high pressure chamber y injection nozzle via the sub passage during the initial stage of fuel pumping or when the injection quantity is small, while the main passage is communicated with the injection nozzle via the secondary passage when the fuel injection is in the later stages or when the injection quantity is large. A fuel injection pump for an internal combustion engine, comprising: switching means for communicating a high pressure chamber and an injection nozzle via the switching means.

(2) The switching means is a recessed portion formed in the plunger for oil feeding, and is configured such that the recessed portion communicates only with the auxiliary passage in the early stage of pumping, and the recessed portion communicates with the main passage in the latter stage of pumping. A fuel injection pump for an internal combustion engine according to claim 1 of the utility model registration claim.

(3) The switching means is a control piston whose position is adjusted by the pressure of the high-pressure chamber or an electromagnetic force supplied from the outside, and the main and sub passages are switched and used according to the position of the piston. A fuel injection pump for an internal combustion engine according to claim 1 of the utility model registration claim.