JPH0287964U

JPH0287964U -

Info

Publication number: JPH0287964U
Application number: JP16687688U
Authority: JP
Priority date: 1988-12-26
Filing date: 1988-12-26
Publication date: 1990-07-12

Description

[Brief explanation of drawings]

第１図は本考案の一実施例による燃料噴射弁４
０の縦断面図、第２図は従来の燃料噴射弁１の縦
断面図、第３図は高圧燃料室内の圧力Ｐｔに対す
るノズル開弁圧の関係を示すグラフ、第４図は燃
料温度に対する燃料リーク量の関係を示すグラフ
である。１……可変開弁圧型の燃料噴射弁、２……ノズ
ルホルダヘツド（インケツト側のノズルホルダボ
デイ）、３……シリンダ、４……ノズルホルダ本
体（ノズル側のノズルホルダボデイ）、５……デ
イスタンスピース、６……ニードル弁、７……ノ
ズルボデイ、８……締付けナツト、９……ノズル
ホルダ、１０……リテーニングナツト、１１……
燃料入口、１２……圧力導入口、１３……リーク
燃料出口、１４……インレツトコネクタ、１５…
…燃料噴射ポンプ、１６……デリバリバルブホル
ダ、１７……噴射管、１８……ポンプ室圧インレ
ツトコネクタ、１９……リークアダプタ、２０…
…リークパイプ、２１……燃料タンク、２２……
燃料通路、２３……圧力通路、２４……リーク燃
料通路、２５……フラツトダンピング機構、２６
……燃料通路、２７……シリンダ室、２８……リ
ーク燃料通路、２９……ダンパピストン、３０…
…燃料通路、３１……セントラルプランジヤ、３
２……ガイド孔、３３……リーク燃料通路、３４
……スプリング室、３５……プレツシヤスプリン
グ、３６……プレツシヤピン、３７，３８……燃
料通路、３９……噴口、４０……可変開弁圧型の
燃料噴射弁、４１……嵌装孔、４２……スペーサ
、４３……Ｏリング、４……圧力通路、４５……
十字状の連通孔、４６……環状溝、４７……リー
ク燃料環流通路、Ｐｔ……高圧燃料室内の圧力、
Ｌ……最大リフト量。 FIG. 1 shows a fuel injection valve 4 according to an embodiment of the present invention.
2 is a longitudinal sectional view of a conventional fuel injection valve 1, FIG. 3 is a graph showing the relationship between the nozzle opening pressure and the pressure Pt in the high-pressure fuel chamber, and FIG. 4 is a graph showing the relationship between the fuel temperature and the fuel temperature. It is a graph showing the relationship between leakage amounts. 1... Variable valve opening pressure type fuel injection valve, 2... Nozzle holder head (nozzle holder body on the inlet side), 3... Cylinder, 4... Nozzle holder body (nozzle holder body on the nozzle side), 5... Distance piece, 6... Needle valve, 7... Nozzle body, 8... Tightening nut, 9... Nozzle holder, 10... Retaining nut, 11...
Fuel inlet, 12... Pressure introduction port, 13... Leak fuel outlet, 14... Inlet connector, 15...
... Fuel injection pump, 16 ... Delivery valve holder, 17 ... Injection pipe, 18 ... Pump chamber pressure inlet connector, 19 ... Leak adapter, 20 ...
...Leak pipe, 21...Fuel tank, 22...
Fuel passage, 23... Pressure passage, 24... Leak fuel passage, 25... Flat damping mechanism, 26
...Fuel passage, 27...Cylinder chamber, 28...Leak fuel passage, 29...Damper piston, 30...
...Fuel passage, 31...Central plunger, 3
2... Guide hole, 33... Leak fuel passage, 34
... Spring chamber, 35 ... Pressure spring, 36 ... Pressure pin, 37, 38 ... Fuel passage, 39 ... Nozzle port, 40 ... Variable valve opening pressure type fuel injection valve, 41 ... Fitting hole, 42...Spacer, 43...O ring, 4...Pressure passage, 45...
Cross-shaped communication hole, 46... Annular groove, 47... Leak fuel circulation passage, Pt... Pressure in the high pressure fuel chamber,
L...Maximum lift amount.

Claims

[Claims for Utility Model Registration] A fuel inlet for introducing high-pressure fuel from a fuel injection pump, and a pressure introduction port for introducing the pressure inside the high-pressure fuel chamber of the fuel injection pump, which changes approximately in proportion to the engine speed. a nozzle body supported by the nozzle holder and having a fuel nozzle communicating with the fuel inlet; a nozzle body slidably housed in the nozzle body and biased in a direction to close the nozzle by a pressure spring; The fuel comprises a needle valve and a central plunger that is slidable integrally with the needle valve, and the pressure in the high-pressure fuel chamber of the fuel injection pump is applied to the central plunger through the pressure introduction port. In the injection valve, a leak fuel passage is formed that communicates with the spring chamber of the pressure spring, and this leak fuel passage is communicated with the pressure introduction port via a leak fuel circulation passage, thereby providing a flow of water to the spring chamber. A fuel injection valve characterized in that the pressure inside the high pressure fuel chamber is also applied.