JPS648570U - - Google Patents
Info
- Publication number
- JPS648570U JPS648570U JP10328687U JP10328687U JPS648570U JP S648570 U JPS648570 U JP S648570U JP 10328687 U JP10328687 U JP 10328687U JP 10328687 U JP10328687 U JP 10328687U JP S648570 U JPS648570 U JP S648570U
- Authority
- JP
- Japan
- Prior art keywords
- diameter cylinder
- small
- plunger
- fuel
- annular recess
- 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
- 239000000446 fuel Substances 0.000 claims description 12
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Fuel-Injection Apparatus (AREA)
Description
第１図、第２図および第３図はそれぞれこの考
案の一実施例を示す概略構成図、第４図は第３図
に示す実施例における燃料加圧装置の燃料噴射終
了時の状態を示す図、第５図は従来の油圧式燃料
噴射装置の一例を示す概略構成図、第６図は環状
溝と横孔との連通状態を示す図である。
５……燃料噴射ノズル、６……戻し管（戻し通
路）、４１……大径シリンダ部、４２……プラン
ジヤ、４３……大径部、４４……小径シリンダ部
、４４ａ……環状溝、４５……小径部、４５ｃ…
…環状凹部、４６……燃料加圧室。
FIGS. 1, 2, and 3 are schematic configuration diagrams showing one embodiment of this invention, and FIG. 4 shows the state of the fuel pressurizing device at the end of fuel injection in the embodiment shown in FIG. 3. FIG. 5 is a schematic configuration diagram showing an example of a conventional hydraulic fuel injection device, and FIG. 6 is a diagram showing a state of communication between an annular groove and a horizontal hole. 5... Fuel injection nozzle, 6... Return pipe (return passage), 41... Large diameter cylinder section, 42... Plunger, 43... Large diameter section, 44... Small diameter cylinder section, 44a... Annular groove, 45...Small diameter part, 45c...
...Annular recess, 46...Fuel pressurization chamber.
Claims (1)
ダ部とのプランジヤの大径部と小径部とをそれぞ
れ摺動自在に設け、大径シリンダ部に圧油を供給
してプランジヤを大径シリンダ部側から小径シリ
ンダ部側へ移動させることにより、小径シリンダ
部の底部とプランジヤの小径部との間に形成され
た燃料加圧室内の燃料を加圧して燃料噴射ノズル
に供給するようにした油圧式燃料噴射装置におい
て、次の２つの条件を満たすようにして前記小径
シリンダ部の内周面に環状凹部を、前記プランジ
ヤの小径部の外周面に環状溝をそれぞれ形成した
ことを特徴とする油圧式燃料噴射装置。 Ａ 前記環状凹部と前記環状溝とのいずれか一方
が前記燃料加圧室に連通され、他方が小径シリン
ダ部の外部に設けられた燃料戻し通路に連通され
ている。 Ｂ 前記環状溝は、前記プランジヤの加圧移動前
においては前記環状凹部よりも前記大径部側に位
置し、前記プランジヤが加圧移動した際には前記
環状凹部に対向するように位置する。[Scope of Claim for Utility Model Registration] A large diameter cylinder part and a small diameter cylinder part are connected to each other, and the large diameter part and the small diameter part of the plunger are provided to be slidable, respectively, and pressurized oil is supplied to the large diameter cylinder part. By moving the plunger from the large-diameter cylinder section side to the small-diameter cylinder section side, the fuel in the fuel pressurizing chamber formed between the bottom of the small-diameter cylinder section and the small-diameter section of the plunger is pressurized and sent to the fuel injection nozzle. In the hydraulic fuel injection device, an annular recess is formed on the inner circumferential surface of the small diameter cylinder portion and an annular groove is formed on the outer circumferential surface of the small diameter portion of the plunger so as to satisfy the following two conditions. A hydraulic fuel injection device characterized by: A One of the annular recess and the annular groove communicates with the fuel pressurizing chamber, and the other communicates with a fuel return passage provided outside the small diameter cylinder portion. B The annular groove is located closer to the large diameter portion than the annular recess before the plunger moves under pressure, and is located opposite to the annular recess when the plunger moves under pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10328687U JPS648570U (en) | 1987-07-07 | 1987-07-07 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10328687U JPS648570U (en) | 1987-07-07 | 1987-07-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS648570U true JPS648570U (en) | 1989-01-18 |
Family
ID=31333977
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10328687U Pending JPS648570U (en) | 1987-07-07 | 1987-07-07 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS648570U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5698562A (en) * | 1980-01-09 | 1981-08-08 | Nippon Denso Co Ltd | Fuel injecting device for use in internal combustion engine |
-
1987
- 1987-07-07 JP JP10328687U patent/JPS648570U/ja active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5698562A (en) * | 1980-01-09 | 1981-08-08 | Nippon Denso Co Ltd | Fuel injecting device for use in internal combustion engine |
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