JPS63143760U - - Google Patents
Info
- Publication number
- JPS63143760U JPS63143760U JP3602987U JP3602987U JPS63143760U JP S63143760 U JPS63143760 U JP S63143760U JP 3602987 U JP3602987 U JP 3602987U JP 3602987 U JP3602987 U JP 3602987U JP S63143760 U JPS63143760 U JP S63143760U
- Authority
- JP
- Japan
- Prior art keywords
- overflow
- piezoelectric actuator
- pressure
- valve
- overflow valve
- 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.)
- Granted
Links
- 239000000446 fuel Substances 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 230000008602 contraction Effects 0.000 claims 3
- 239000012530 fluid Substances 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Fuel-Injection Apparatus (AREA)
Description
第１図は本考案一実施例のユニツトインジエク
タの構成を示す概略構成図、第２図はその溢流弁
付近の詳細を示す拡大図、第３図は本考案第２実
施例のユニツトインジエクタの溢流弁付近の詳細
を示す拡大図、第４図は本考案第３実施例のユニ
ツトインジエクタの溢流弁付近の詳細を示す拡大
図、である。
３……燃料圧送部本体、５……燃料噴射ノズル
本体、７……圧電アクチユエータ、１１……プラ
ンジヤ、５１……ニードル、６１……中間部材、
７１……溢流弁、８５……圧電素子、８７……ア
クチユエータピストン、９９……伝達圧力室。
Fig. 1 is a schematic configuration diagram showing the structure of a unit injector according to an embodiment of the present invention, Fig. 2 is an enlarged view showing details of the vicinity of the overflow valve, and Fig. 3 is a diagram showing the unit injector according to a second embodiment of the present invention. FIG. 4 is an enlarged view showing details of the vicinity of the overflow valve of the unit injector according to the third embodiment of the present invention. 3... Fuel pressure feeding unit main body, 5... Fuel injection nozzle main body, 7... Piezoelectric actuator, 11... Plunger, 51... Needle, 61... Intermediate member,
71... Overflow valve, 85... Piezoelectric element, 87... Actuator piston, 99... Transmission pressure chamber.
Claims (1)
端側に圧力室を形成して設けられた燃料圧送部と
、 上記本体の先端部に設けられ、上記圧力室に連
通する燃料噴射ノズルと、 上記圧力室と燃料噴射ノズルとの間に形成され
、溢流通路に連通する横孔部と、 該横孔部内に摺動可能に設けられ、上記溢流通
路と横孔部との連通部を開閉する溢流弁と、 該溢流弁の摺動方向と自身の伸縮方向とが一致
するよう固設された圧電アクチユエータと、 該圧電アクチユエータと上記溢流弁との間に、
上記溢流弁に直接もしくは間接にて当接され、上
記圧電アクチユエータの移動部の端面より径の小
さいロツドと、 その内部に流体が密封され、上記圧電アクチユ
エータの伸縮を上記ロツドに伝達する伝達圧力室
と、 上記圧電アクチユエータが収縮するとき、上記
溢流弁を介して流入する溢流燃料を取り込むこと
により上記伝達圧力室の流体圧力の低下を防ぐ逆
止弁と、 を備え、上記圧電アクチユエータへの通電を行
なうことにより燃料噴射を行なうよう働くユニツ
トインジエクタであつて、 更に、上記圧電アクチユエータが収縮するとき
、上記逆止弁に流れ込む溢流燃料の圧力を低下さ
せる圧力低下手段を上記溢流通路と上記逆止弁と
の間に設けたことを特徴とするユニツトインジエ
クタ。 (2) 上記圧力低下手段が、上記逆止弁の移動方
向を、上記圧電アクチユエータの伸縮方向と直角
に位置させることにより構成された実用新案登録
請求の範囲第１項記載のユニツトインジエクタ。[Scope of Claim for Utility Model Registration] (1) A fuel pressure feeding section provided with a plunger disposed in a part of the main body and a pressure chamber formed on the tip side; a fuel injection nozzle that communicates with the chamber; a horizontal hole that is formed between the pressure chamber and the fuel injection nozzle and that communicates with the overflow passage; and a side hole that is slidably provided within the horizontal hole and that is connected to the overflow passage. an overflow valve that opens and closes a communication portion between the overflow valve and the side hole; a piezoelectric actuator that is fixed so that the sliding direction of the overflow valve matches the direction of expansion and contraction of the overflow valve; and the piezoelectric actuator and the overflow valve. Between,
A rod that is in direct or indirect contact with the overflow valve and has a smaller diameter than the end face of the moving part of the piezoelectric actuator, and a fluid is sealed inside the rod, and a transmission pressure that transmits the expansion and contraction of the piezoelectric actuator to the rod. a check valve that prevents a drop in fluid pressure in the transmission pressure chamber by taking in overflow fuel flowing in through the overflow valve when the piezoelectric actuator contracts; The unit injector operates to inject fuel by energizing the check valve, and further includes a pressure reducing means for reducing the pressure of overflow fuel flowing into the check valve when the piezoelectric actuator contracts. A unit injector characterized in that it is provided between a passageway and the check valve. (2) The unit injector according to claim 1, wherein the pressure reducing means is configured by locating the movement direction of the check valve at right angles to the expansion and contraction direction of the piezoelectric actuator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3602987U JPH0511341Y2 (en) | 1987-03-12 | 1987-03-12 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3602987U JPH0511341Y2 (en) | 1987-03-12 | 1987-03-12 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63143760U true JPS63143760U (en) | 1988-09-21 |
| JPH0511341Y2 JPH0511341Y2 (en) | 1993-03-19 |
Family
ID=30846058
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3602987U Expired - Lifetime JPH0511341Y2 (en) | 1987-03-12 | 1987-03-12 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0511341Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0237264U (en) * | 1988-09-01 | 1990-03-12 |
-
1987
- 1987-03-12 JP JP3602987U patent/JPH0511341Y2/ja not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0237264U (en) * | 1988-09-01 | 1990-03-12 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0511341Y2 (en) | 1993-03-19 |