JPS63158580U

JPS63158580U -

Info

Publication number: JPS63158580U
Application number: JP5101687U
Authority: JP
Priority date: 1987-04-06
Filing date: 1987-04-06
Publication date: 1988-10-18
Anticipated expiration: 2002-04-06
Also published as: JPH0523826Y2

Description

[Brief explanation of the drawing]

第１図は本考案装置の断面図、第２図は第１図
矢印部分の拡大断面図、第３図は第１図矢印
部分の拡大断面図、第４図は第１図矢印部分の
拡大断面図、第５図は従来と本考案との燃料噴射
率の比較曲線図である。１……ノズル本体、２……燃料通路、３……噴
孔、４……ニードル弁軸、５……燃料溜り室、６
……第１プレツシヤ軸、７……第１スプリング室
、９……第２プレツシヤ軸、１０……第２スプリ
ング室、１２……リーケージ通路、１３……オリ
フイス、１６……溝通路、１８……リターンパイ
プ。 Fig. 1 is a sectional view of the device of the present invention, Fig. 2 is an enlarged sectional view of the arrowed part in Fig. 1, Fig. 3 is an enlarged sectional view of the arrowed part in Fig. 1, and Fig. 4 is an enlarged sectional view of the arrowed part in Fig. 1. The cross-sectional view and FIG. 5 are comparison curves of fuel injection rates between the conventional and the present invention. 1... Nozzle body, 2... Fuel passage, 3... Nozzle hole, 4... Needle valve shaft, 5... Fuel reservoir chamber, 6
...First pressure shaft, 7...First spring chamber, 9...Second pressure shaft, 10...Second spring chamber, 12...Leakage passage, 13...Orifice, 16...Groove passage, 18... ...Return pipe.

Claims

[Scope of utility model registration request]

A nozzle body includes a nozzle hole, a fuel passage that guides fuel pressure-fed from an injection pump to the nozzle hole, a needle valve shaft that is pushed up by fuel pressure in the fuel passage to open and close the nozzle hole, and this needle valve shaft. A fuel reservoir chamber provided around the tip of the nozzle, a first pressure shaft coaxially connected to the needle valve shaft, and a first spring chamber provided in the nozzle body for pressing the first pressure shaft. a first spring that applies a first valve opening pressure to the needle valve shaft; a second pressure shaft that is movable up and down coaxially with the first pressure shaft; and a second spring chamber provided in the nozzle body. a second spring that presses the second pressure shaft and applies a second valve opening pressure to the needle valve shaft after the first pressure shaft rises and comes into contact with the second pressure shaft; The valve opening pressure type fuel injection device is provided with a leakage passage communicating between the fuel reservoir chamber and the first spring chamber in the needle valve shaft and the first pressure shaft, and the leakage passage is provided with an orifice,
A fuel injection rate control device characterized in that a passage opened and closed by a second pressure shaft is provided between the first spring chamber and the second spring chamber, and a return passage is provided that communicates the second spring chamber with the low pressure side. .