JPH0424659U

JPH0424659U -

Info

Publication number: JPH0424659U
Application number: JP6400890U
Authority: JP
Priority date: 1990-06-19
Filing date: 1990-06-19
Publication date: 1992-02-27
Anticipated expiration: 2005-06-19
Also published as: JP2512426Y2

Description

[Brief explanation of the drawing]

第１図はこの考案の一実施例を示す概略構成図
、第２図および第３図はこの考案の他の実施例を
示すもので、第２図はその縦断面図、第３図は開
閉弁、および２つの逆止弁を示すためのデリバリ
バルブシートおよびデリバリバルブホルダの拡大
展開図、第４図は従来の燃料噴射装置の一例を示
す縦断面図である。１……燃料噴射ポンプ、２……初期燃料噴射ノ
ズル、３……主燃料噴射ノズル、４……開閉弁、
５……オリフイス、４１……高圧室、４２……パ
イロツト圧室、４３……弁体、４４……弁ばね、
４５……弁座。 Fig. 1 is a schematic configuration diagram showing one embodiment of this invention, Figs. 2 and 3 show other embodiments of this invention, Fig. 2 is a longitudinal sectional view thereof, and Fig. 3 is an open/closed view. FIG. 4 is an enlarged developed view of a delivery valve seat and a delivery valve holder to show a valve and two check valves, and FIG. 4 is a longitudinal sectional view showing an example of a conventional fuel injection device. 1...Fuel injection pump, 2...Initial fuel injection nozzle, 3...Main fuel injection nozzle, 4...Opening/closing valve,
5... Orifice, 41... High pressure chamber, 42... Pilot pressure chamber, 43... Valve body, 44... Valve spring,
45...Benza.

Claims

[Scope of utility model registration request]

In a fuel injection device in which fuel is pumped from one fuel injection pump to an initial fuel injection nozzle for pilot injection and a main fuel injection nozzle for main injection, the valve opening pressure of the initial fuel injection nozzle is set to the main fuel injection nozzle. A high pressure chamber is set lower than the valve opening pressure of the fuel injection nozzle, and between the fuel injection pump and the pilot injection fuel injection nozzle, a high pressure chamber into which fuel pumped from the fuel injection pump is introduced; A pilot pressure chamber into which the fuel pumped under pressure is introduced via an orifice, a valve body provided between these high pressure chambers and the pilot pressure chamber, and a valve body that flows from the pilot pressure chamber side to the high pressure chamber side. a valve spring biased towards the valve body and seated on the valve seat, wherein the pressure in the high pressure chamber is higher than the pressure in the pilot pressure chamber, and the pressing force against the valve body due to the differential pressure is the biasing force of the valve spring. When the pressure becomes larger, the valve element lifts from the valve seat to communicate the fuel injection pump and the initial fuel injection nozzle, and when the pressing force due to the differential pressure becomes smaller than the biasing force of the valve spring, the valve element lifts from the valve seat. 1. A fuel injection device comprising an on-off valve that is seated and shuts off between the fuel injection pump and the initial fuel injection nozzle.