JPS61160265U

JPS61160265U -

Info

Publication number: JPS61160265U
Application number: JP4456585U
Authority: JP
Priority date: 1985-03-27
Filing date: 1985-03-27
Publication date: 1986-10-04

Description

[Brief explanation of drawings]

第１図は本考案の一実施例を示す燃料噴射ノズ
ルの縦断面図、第２図は本考案の他の実施例を示
す燃料噴射ノズルの縦断面図、第３図は第１の蓄
圧室の圧力変化特性線図である。１……燃料噴射ノズル、２……ノズルホルダ、
３……ノズルボデイ、３ｂ……噴孔、６……燃料
流入口、９……第１の蓄圧室、１１……第２の蓄
圧室、１２……連通路、１３……第１のチエツク
弁、１５，１５ａ……燃料油圧戻し手段、１６…
…ばね、１７……第２のチエツク弁、１８……軸
杆部材、１９……ノズルニードル、２０……ばね
、２１，２３……戻し油路、２４……オリフイス
、２５……第３のチエツク弁。 Fig. 1 is a longitudinal sectional view of a fuel injection nozzle showing one embodiment of the present invention, Fig. 2 is a longitudinal sectional view of a fuel injection nozzle showing another embodiment of the invention, and Fig. 3 is a first pressure accumulation chamber. FIG. 3 is a pressure change characteristic diagram. 1...Fuel injection nozzle, 2...Nozzle holder,
3... Nozzle body, 3b... Nozzle hole, 6... Fuel inlet, 9... First pressure accumulation chamber, 11... Second pressure accumulation chamber, 12... Communication passage, 13... First check valve , 15, 15a... fuel oil pressure return means, 16...
... Spring, 17 ... Second check valve, 18 ... Shaft member, 19 ... Nozzle needle, 20 ... Spring, 21, 23 ... Return oil path, 24 ... Orifice, 25 ... Third Check valve.

Claims

[Claims for Utility Model Registration] 1. A nozzle holder having a fuel inlet connected to a fuel injection pump, a nozzle body supported by the nozzle holder and having a nozzle hole at its lower end, and a nozzle body having the nozzle hole in the nozzle body. a nozzle needle slidably mounted so as to be able to open and close; a first pressure accumulation chamber provided within the nozzle holder and communicating with the fuel inlet; and a first pressure accumulation chamber provided within the nozzle holder and communicating with the fuel inlet. a second pressure accumulation chamber that communicates with the chamber via a communication passage and the nozzle hole; and a second pressure accumulation chamber that is located within the first pressure accumulation chamber and is provided to open and close the fuel inlet, and is closed by a spring. a first check valve biased in the direction; and a first check valve located within the second pressure accumulating chamber and provided opposite to the upper end surface of the nozzle needle so as to be able to open and close the communication passage; a second check valve biased in the valve closing direction by an interposed spring; an upper end connected to the second check valve and a lower end sliding into a bottomed hole provided at the upper end of the nozzle needle; A freely fitted shaft rod member, a return oil passage connecting the first pressure accumulation chamber and the low pressure section, and a solenoid valve interposed in the middle of the return oil passage to open and close the return oil passage. , a fuel oil pressure return means disposed upstream of the electromagnetic valve to gradually return the fuel oil pressure in the first pressure accumulation chamber to a low pressure side when pressure feeding of fuel from the fuel injection pump to the fuel inlet stops. Fuel injection nozzle. 2. The fuel injection nozzle according to claim 1, wherein the fuel oil pressure return means is an orifice provided in the first check valve and communicating with the fuel inlet. 3. The fuel oil pressure return means includes a return oil passage provided to communicate the first pressure accumulation chamber and the fuel inlet, and a third oil pressure return passage with an orifice provided in the middle of the return oil passage so as to be able to lift within a predetermined range. A fuel injection nozzle according to claim 1, which comprises a check valve.