JPH02122130U - - Google Patents
Info
- Publication number
- JPH02122130U JPH02122130U JP3106389U JP3106389U JPH02122130U JP H02122130 U JPH02122130 U JP H02122130U JP 3106389 U JP3106389 U JP 3106389U JP 3106389 U JP3106389 U JP 3106389U JP H02122130 U JPH02122130 U JP H02122130U
- Authority
- JP
- Japan
- Prior art keywords
- needle valve
- nozzle needle
- piston
- push rod
- oil passage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000010586 diagram Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000000446 fuel Substances 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
Landscapes
- Fuel-Injection Apparatus (AREA)
- High-Pressure Fuel Injection Pump Control (AREA)
Description
第１図は本考案の一実施例におけるユニツトイ
ンジエクタの断面図、第２図は針弁リフトとノズ
ル面積との関係を示す線図、第３図は従来例と本
考案における針弁のリフト量の時間的変化を示す
波形図、第４図は本考案による改善前後の回転数
と燃料噴射量との関係を示す線図、第５図は従来
例のユニツトインジエクタの断面図、第６図は従
来のユニツトインジエクタの噴射量特性を示す線
図、第７図は針弁リフトとノズル面積との関係を
示す線図である。
２……プランジヤ、８……ノズル、９……針弁
、１６……プツシユロツド、１７……ピストン、
１８……油圧室、１９……油圧源、２０……油路
、２１……バルブ。
Fig. 1 is a sectional view of a unit injector in an embodiment of the present invention, Fig. 2 is a diagram showing the relationship between needle valve lift and nozzle area, and Fig. 3 is a needle valve lift in the conventional example and the present invention. FIG. 4 is a waveform diagram showing the temporal change in fuel injection amount, FIG. This figure is a diagram showing the injection quantity characteristics of a conventional unit injector, and FIG. 7 is a diagram showing the relationship between needle valve lift and nozzle area. 2... Plunger, 8... Nozzle, 9... Needle valve, 16... Push rod, 17... Piston,
18...Hydraulic chamber, 19...Hydraulic source, 20...Oil passage, 21...Valve.
Claims (1)
ンジエクタにおいて、上記ノズル針弁の背後を押
しつけて同ノズル針弁のリフト量を制限するピス
トン付プツシユロツドと、同プツシユロツドのピ
ストン背面に油圧を作用させる油圧室と、同油圧
室と外部の油圧源とを結ぶ油路を機関の低速域で
は開、低速域以外では閉とする油路開閉手段とを
設けたことを特徴とするユニツトインジエクタ。 A hole nozzle type unit injector having a nozzle needle valve includes a push rod with a piston that presses against the back of the nozzle needle valve to limit the amount of lift of the nozzle needle valve, and a hydraulic chamber that applies hydraulic pressure to the back surface of the piston of the push rod. A unit injector characterized in that it is provided with an oil passage opening/closing means for opening and closing an oil passage connecting the hydraulic chamber and an external hydraulic power source in a low speed range of the engine and closed in a range other than the low speed range of the engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3106389U JPH02122130U (en) | 1989-03-18 | 1989-03-18 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3106389U JPH02122130U (en) | 1989-03-18 | 1989-03-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02122130U true JPH02122130U (en) | 1990-10-05 |
Family
ID=31256655
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3106389U Pending JPH02122130U (en) | 1989-03-18 | 1989-03-18 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02122130U (en) |
-
1989
- 1989-03-18 JP JP3106389U patent/JPH02122130U/ja active Pending
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