JPH01148057U - - Google Patents
Info
- Publication number
- JPH01148057U JPH01148057U JP4354988U JP4354988U JPH01148057U JP H01148057 U JPH01148057 U JP H01148057U JP 4354988 U JP4354988 U JP 4354988U JP 4354988 U JP4354988 U JP 4354988U JP H01148057 U JPH01148057 U JP H01148057U
- Authority
- JP
- Japan
- Prior art keywords
- pump
- pressure
- valve
- fuel
- chamber
- 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 11
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- High-Pressure Fuel Injection Pump Control (AREA)
- Fuel-Injection Apparatus (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Description
第１図は本考案の実施例を示す燃料噴射ポンプ
の断面図、第２図はフエイスカムの幾何的送油率
の特性図、第３図、第４図は高負荷域と低負荷域
のそれぞれにおける電磁パイロツト開閉弁および
電磁開閉弁のタイミングチヤートである。第５図
は従来例を示す断面図、第６図は電磁パイロツト
開閉弁のタイミングチヤートである。
１…ポンプハウジング、３…フイードポンプ、
４…プランジヤポンプ、５…フエイスカム、６…
プランジヤ、１０…プランジヤ室、１１…燃料戻
し通路、１２…電磁パイロツト開閉弁、１７…パ
イロツト弁、１８…バランスピストン、２０…ポ
ンプ室、２２…燃料戻し通路、２３…電磁開閉弁
、２５…スプールバルブ、２７…タイマ進角装置
。
Fig. 1 is a cross-sectional view of a fuel injection pump showing an embodiment of the present invention, Fig. 2 is a characteristic diagram of the geometric oil feed rate of Facecam, and Figs. 3 and 4 are high load range and low load range, respectively. This is a timing chart of the electromagnetic pilot on-off valve and the electromagnetic on-off valve. FIG. 5 is a sectional view showing a conventional example, and FIG. 6 is a timing chart of an electromagnetic pilot on-off valve. 1...Pump housing, 3...Feed pump,
4...plunger pump, 5...face cam, 6...
Plunger, 10...Plunger chamber, 11...Fuel return passage, 12...Solenoid pilot on-off valve, 17...Pilot valve, 18...Balance piston, 20...Pump chamber, 22...Fuel return passage, 23...Solenoid on-off valve, 25...Spool Valve, 27...Timer advance device.
Claims (1)
プと高圧プランジヤポンプを備え、ポンプハウジ
ングに形成したフイードポンプの低圧ポンプ室と
、プランジヤポンプの高圧プランジヤ室とを連通
する２つの燃料戻し通路を並列に設け、一方の燃
料戻し通路に電磁パイロツト開閉弁を介装し、こ
の電磁パイロツト開閉弁は電磁力により駆動され
るパイロツト弁と、このパイロツト弁によりその
背圧を調整されるバランスピストンを備え、この
バランスピストンにより前記高圧プランジヤ室か
ら燃料を低圧ポンプ室に流出させることにより燃
料噴射終了時期を調整するとともに、他方の燃料
戻し通路に電磁開閉弁を介装し、この電磁開閉弁
を介して高圧プランジヤ室から低圧ポンプ室へ流
出する燃料を遮断することにより燃料噴射開始時
期を調整するように構成したことを特徴とするデ
イーゼル機関の燃料噴射ポンプ。 It is equipped with a low-pressure feed pump and a high-pressure plunger pump that rotate in synchronization with engine rotation, and two fuel return passages are provided in parallel to communicate between the low-pressure pump chamber of the feed pump formed in the pump housing and the high-pressure plunger chamber of the plunger pump, and one An electromagnetic pilot on-off valve is installed in the fuel return passage, and this electromagnetic pilot on-off valve is equipped with a pilot valve driven by electromagnetic force and a balance piston whose back pressure is adjusted by the pilot valve. The end timing of fuel injection is adjusted by causing fuel to flow out from the high pressure plunger chamber to the low pressure pump chamber, and an electromagnetic shutoff valve is interposed in the other fuel return passage, and low pressure is supplied from the high pressure plunger chamber through the solenoid shutoff valve. A fuel injection pump for a diesel engine, characterized in that the fuel injection start timing is adjusted by blocking fuel flowing into a pump chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4354988U JPH01148057U (en) | 1988-03-31 | 1988-03-31 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4354988U JPH01148057U (en) | 1988-03-31 | 1988-03-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01148057U true JPH01148057U (en) | 1989-10-13 |
Family
ID=31269942
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4354988U Pending JPH01148057U (en) | 1988-03-31 | 1988-03-31 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01148057U (en) |
-
1988
- 1988-03-31 JP JP4354988U patent/JPH01148057U/ja active Pending
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