JPH0246065U

JPH0246065U -

Info

Publication number: JPH0246065U
Application number: JP12268788U
Authority: JP
Priority date: 1988-09-21
Filing date: 1988-09-21
Publication date: 1990-03-29
Anticipated expiration: 2003-09-21
Also published as: JPH0640926Y2

Description

[Brief explanation of drawings]

第１図は第２図の―線に沿つてみたユニツ
トインジエクタの側面断面図、第２図は第３図の
―線に沿つてみた側面断面図、第３図は第２
図の―線に沿つてみた側面断面図、第４図は
第３図の一部の拡大側面断面図、第５図は第３図
および第７図のＶ―Ｖ線に沿つてみた側面断面図
、第６図は第３図の平面図、第７図は第３図の
―線に沿つてみた平面断面図である。３……ノズル口、７……ニードル、１１……プ
ランジヤ孔、１２……プランジヤ、１５……燃料
加圧室、２０……燃料供給ポート、２１……燃料
ポート、２３……円周溝、３０……摺動孔、３１
……溢流弁、４１……加圧燃料導入室、４２……
燃料溢流室、６０……ロツド、６６……圧力制御
室、７７……ピエゾ圧電素子、７８……可変容積
室。 Figure 1 is a side cross-sectional view of the unit injector taken along the - line in Figure 2, Figure 2 is a side cross-sectional view taken along the - line in Figure 3, and Figure 3 is a side cross-sectional view of the unit injector taken along the - line in Figure 2.
Fig. 4 is an enlarged side sectional view of a part of Fig. 3, Fig. 5 is a side sectional view taken along line V-V in Figs. 3 and 7. 6 is a plan view of FIG. 3, and FIG. 7 is a sectional plan view taken along the line --- in FIG. 3. 3... Nozzle port, 7... Needle, 11... Plunger hole, 12... Plunger, 15... Fuel pressurizing chamber, 20... Fuel supply port, 21... Fuel port, 23... Circumferential groove, 30...Sliding hole, 31
... Overflow valve, 41 ... Pressurized fuel introduction chamber, 42 ...
Fuel overflow chamber, 60...rod, 66...pressure control chamber, 77...piezoelectric element, 78...variable volume chamber.

Claims

[Scope of utility model registration request]

a plunger that is reciprocated within the plunger hole; a fuel pressurization chamber that is formed within the plunger hole and defined by the plunger; In the fuel injection device, the plunger hole is provided with a fuel supply port and a plunger pressurizes low-pressure fuel supplied from the fuel supply port into a fuel pressurizing chamber and injects the pressurized fuel. A drilled hole that is cut and extends in a direction perpendicular to the axis of the plunger hole, a drilled hole portion that extends in one direction from the plunger hole forms the fuel supply port, and a drilled hole that extends in the other direction from the plunger hole. A fuel injection device in which the portion forms a fuel port whose outer end is closed, and the fuel supply port and the fuel port are communicated with each other via a communication path.