JPH0449663U

JPH0449663U -

Info

Publication number: JPH0449663U
Application number: JP9073690U
Authority: JP
Priority date: 1990-08-31
Filing date: 1990-08-31
Publication date: 1992-04-27

Description

[Brief explanation of the drawing]

第１図はこの考案による燃料噴射ノズルの閉鎖
状態を示す概略説明図、第２図は第１図の噴孔の
パイロツト噴射状態を示す説明図、第３図は第１
図の噴孔の一次閉鎖状態を示す説明図、第４図は
第１図の噴孔の全開状態を示す説明図、第５図は
この燃料噴射ノズルによる噴射量と時間との関係
を示すグラフ、及び第６図は従来の燃料噴射ノズ
ルの一例を示す概略説明図である。１……ノズル本体、２……針弁、３……燃料通
路、４……遮断面、５……噴孔、６……燃料室、
７……一次室、８……二次室、９……弁座部、１
０……絞り部、１１……突出部、１２……先端部
、１３……ステム。 Fig. 1 is a schematic explanatory diagram showing the closed state of the fuel injection nozzle according to this invention, Fig. 2 is an explanatory diagram showing the pilot injection state of the nozzle hole in Fig.
FIG. 4 is an explanatory diagram showing the nozzle hole shown in FIG. 1 in a fully open state. FIG. 5 is a graph showing the relationship between the injection amount and time of this fuel injection nozzle. , and FIG. 6 are schematic explanatory diagrams showing an example of a conventional fuel injection nozzle. 1... Nozzle body, 2... Needle valve, 3... Fuel passage, 4... Blocking surface, 5... Nozzle hole, 6... Fuel chamber,
7...Primary chamber, 8...Secondary chamber, 9...Valve seat, 1
0...Aperture part, 11...Protrusion part, 12...Tip part, 13...Stem.

Claims

[Scope of utility model registration request]

In a fuel injection nozzle, the nozzle body has a nozzle body formed with a fuel passage and a nozzle hole, and a needle valve that opens and closes the nozzle hole by moving toward and away from a valve seat formed on the nozzle body, the nozzle body communicating with the fuel passage. a fuel chamber formed in the nozzle body, a constriction portion provided on the nozzle body that divides the fuel chamber into a primary chamber and a secondary chamber, a blocking surface provided on the tip of the needle valve that can come into contact with and separate from the valve seat, and the needle valve. A fuel injection nozzle having a protrusion provided on the needle valve for opening and closing the throttle portion by sliding movement relative to the nozzle body.