JPS63160U

JPS63160U -

Info

Publication number: JPS63160U
Application number: JP9215186U
Authority: JP
Priority date: 1986-06-17
Filing date: 1986-06-17
Publication date: 1988-01-05

Description

[Brief explanation of drawings]

第１図は本考案の一実施例に係る燃料噴射ノズ
ル装置の縦断面図、第２図は第１図の要部拡大断
面図、第３図はノズルニードルのリフト量に応じ
た連通路のポート開口面積を示す線図、第４図は
アイドル時の噴射率特性線図、第５図は中・高速
時の噴射率特性線図である。３……ノズルボデイ、６……ノズルニードル、
７……燃料溜室、８……噴射孔、１０……背圧室
、１２……ノズルばね、１４……ばね嵌装室（収
納室），１６……連通路、１７ａ……背圧室側ポ
ート、１８ａ……燃料溜室側ポート、Ａ……燃料
噴射ノズル装置。 Fig. 1 is a longitudinal cross-sectional view of a fuel injection nozzle device according to an embodiment of the present invention, Fig. 2 is an enlarged cross-sectional view of the main part of Fig. 1, and Fig. 3 is a cross-sectional view of a communication passage according to the lift amount of the nozzle needle. A diagram showing the port opening area, FIG. 4 is an injection rate characteristic diagram at idle, and FIG. 5 is an injection rate characteristic diagram at medium and high speeds. 3... Nozzle body, 6... Nozzle needle,
7... Fuel reservoir chamber, 8... Injection hole, 10... Back pressure chamber, 12... Nozzle spring, 14... Spring fitting chamber (storage chamber), 16... Communication passage, 17a... Back pressure chamber Side port, 18a...Fuel reservoir side port, A...Fuel injection nozzle device.

Claims

[Scope of utility model registration request]

The nozzle body includes a nozzle body, a nozzle needle fitted in the nozzle body such that it can be lifted freely so as to open and close the injection hole, and a nozzle spring that biases the nozzle needle in a valve closing direction. In a fuel injection nozzle device for an internal combustion engine in which fuel can be injected by lifting a needle, on the base end side of the nozzle needle,
A back pressure chamber that acts on the nozzle needle in a valve closing direction and communicates with the storage chamber of the nozzle spring through a small gap is disposed in the nozzle body, and the back pressure chamber and the fuel reservoir chamber provided in the nozzle body are connected to the nozzle body. When the nozzle needle is lifted by a predetermined amount, the fuel reservoir side port of the communication passage is opened to the fuel reservoir chamber, and the back pressure chamber side port of the communication passage is opened to the back pressure chamber. and when the nozzle needle further lifts by a predetermined amount,
A fuel injection nozzle device for an internal combustion engine, characterized in that the positions of each port of the communication passage are set so as to close a back pressure chamber side port of the communication passage.