JPH0256855U

JPH0256855U -

Info

Publication number: JPH0256855U
Application number: JP13443588U
Authority: JP
Priority date: 1988-10-17
Filing date: 1988-10-17
Publication date: 1990-04-24

Description

[Brief explanation of drawings]

第１図は第１実施例の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図は第２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、
２６……ニードル、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、５１……ピエゾ圧電素
子、６０……棒状弁、６３……弁通路。 FIG. 1 is a side sectional view of the fuel injection valve of the first embodiment, and FIGS. 2 and 3 are enlarged views of the main parts of FIG.
Figure 2 is a diagram showing the case where the sliding valve is at the upper end position;
Figure 3 is a diagram showing the case where the sliding valve is at the lower end position;
FIG. 4 is a side sectional view of the fuel injection valve of the second embodiment;
FIG. 5 is a schematic configuration diagram of the internal combustion engine, and FIG. 6 is a diagram showing the fuel injection rate. 20...Fuel injection valve body, 24...Nozzle port,
26... Needle, 28... Fuel supply passage, 31
...Sliding valve, 32 ... Back pressure chamber, 39 ... Fuel discharge passage, 41 ... Fuel passage, 51 ... Piezo piezoelectric element, 60 ... Rod-shaped valve, 63 ... Valve passage.

Claims

[Scope of utility model registration request]

a needle for controlling the opening and closing of a nozzle port in response to changes in fuel pressure in a back pressure 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. A body is fixed opposite to 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, and the back pressure chamber is closed to the fuel. The back pressure chamber communicates with the fuel discharge passage through a throttle passage formed between the other end of the communication passage and the valve body when the valve body is blocked from the discharge passage and is in the second extreme position. fuel injection valve.