JPH0256854U

JPH0256854U -

Info

Publication number: JPH0256854U
Application number: JP13443488U
Authority: JP
Priority date: 1988-10-17
Filing date: 1988-10-17
Publication date: 1990-04-24

Description

[Brief explanation of the drawing]

第１図は燃料噴射弁の側面断面図、第２図およ
び第３図は第１図の要部拡大図で、第２図は摺動
弁が上端位置にある場合を示す図、第３図は摺動
弁が下端位置にある場合を示す図、第４図は他の
実施例の燃料噴射弁の側面断面図、第５図は内燃
機関の概略構成図、第６図は燃料噴射率を示す線
図である。２０……燃料噴射弁本体、２４……ノズル口、
２８……燃料供給通路、３１……摺動弁、３２…
…背圧室、３９……燃料排出通路、４１……燃料
通路、４２……弁孔、５１……ピエゾ圧電素子、
５５……棒状弁、５６……燃料通路。 Figure 1 is a side sectional view of the fuel injection valve, Figures 2 and 3 are enlarged views of the main parts of Figure 1, Figure 2 is a diagram showing the sliding valve at the upper end position, Figure 3 4 is a side sectional view of a fuel injection valve of another embodiment, FIG. 5 is a schematic diagram of the internal combustion engine, and FIG. 6 is a diagram showing the fuel injection rate. FIG. 20...Fuel injection valve body, 24...Nozzle port,
28...Fuel supply passage, 31...Sliding valve, 32...
... Back pressure chamber, 39 ... Fuel discharge passage, 41 ... Fuel passage, 42 ... Valve hole, 51 ... Piezo piezoelectric element,
55...rod valve, 56...fuel passage.

Claims

[Scope of utility model registration request]

a needle for controlling the opening and closing of a nozzle opening in response to changes in fuel pressure in an overpressure chamber formed in the housing; a sliding valve that is slidable between extreme positions; when the sliding valve is in the first extreme position, the back pressure chamber is communicated with the fuel supply passage; and when the sliding valve is in the second extreme position, the back pressure chamber is communicated with the fuel supply passage; In a fuel injection valve in which the back pressure chamber is communicated with a fuel discharge passage, a valve that forms a communication passage in the slide valve, one end of which communicates with the back pressure chamber, and controls opening and closing of the other end of the communication passage. and when the sliding valve is in the first extreme position, the other end of the communication passage is closed by the valve body, the back pressure chamber is isolated from the fuel discharge passage, and the second end is closed. When the fuel injection valve is in an extreme position, the other end of the communication passage is opened and the back pressure chamber is communicated with the fuel discharge passage.