JPS62243962A - Distributor type fuel injection pump - Google Patents

Distributor type fuel injection pump

Info

Publication number
JPS62243962A
JPS62243962A JP8479386A JP8479386A JPS62243962A JP S62243962 A JPS62243962 A JP S62243962A JP 8479386 A JP8479386 A JP 8479386A JP 8479386 A JP8479386 A JP 8479386A JP S62243962 A JPS62243962 A JP S62243962A
Authority
JP
Japan
Prior art keywords
plunger
barrel
fuel injection
slit
suction
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
Application number
JP8479386A
Other languages
Japanese (ja)
Inventor
Yutaka Tajima
田嶋 豊
Hisashi Nakamura
久 中村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bosch Corp
Original Assignee
Diesel Kiki Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Diesel Kiki Co Ltd filed Critical Diesel Kiki Co Ltd
Priority to JP8479386A priority Critical patent/JPS62243962A/en
Publication of JPS62243962A publication Critical patent/JPS62243962A/en
Pending legal-status Critical Current

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  • Fuel-Injection Apparatus (AREA)

Abstract

PURPOSE:To obtain high pressure injection in a short period and to promote also the reduction of manufacturing cost, by providing barrel suction ports of the equal quantity to the quantity of cylinders corresponding to barrel delivery ports and forming a suction slit by the only one quantity in a plunger. CONSTITUTION:A plunger 5, which rotates and reciprocates, injects fuel to be distributed. A finish of fuel injection is controlled such that a passage 3a, connecting a plunger pressurizing chamber 1 with a low pressure chamber 2 in a pump housing, is opened by a solenoid valve 4. Barrel suction ports 8 are provided by the quantity equal to the quantity of cylinders corresponding to barrel delivery ports 11. Further the plunger 5 forms only one suction slit 7, while this suction slit 7 serves also for the delivery slit of the plunger 5. In this way, a pump, which can obtain high pressure injection in a short period, enables the reduction of manufacturing cost to be promoted.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、電磁スピルバルブ式分配型燃料噴射ポンプに
関する。
DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an electromagnetic spill valve type distribution type fuel injection pump.

(従来技術) 電磁スピルバルブ式分配型燃料噴射ポンプは、コントロ
ールスリーブの位置に応してプランジャのカットオフポ
ートを開口する形式の機械式分配型燃料噴射ポンプと異
なり、プランジャ加圧室とポンプハウジング内の低圧室
とを連通ずる通路に電磁弁を配設し、この電磁弁の開閉
により噴射量の制御を行うものである。
(Prior art) Unlike mechanical distribution type fuel injection pumps, which open the cut-off port of the plunger according to the position of the control sleeve, an electromagnetic spill valve type distribution type fuel injection pump has a plunger pressure chamber and a cut-off port in the pump housing. A solenoid valve is disposed in a passage communicating with the low pressure chamber, and the injection amount is controlled by opening and closing the solenoid valve.

これを第4図に基いて詳述すると、この種の電磁スピル
バルブ式分配型燃料噴射ポンプは、プランジャ加圧室1
と、ポンプハウジング内の低圧室たるポンプ室2とを連
通する通路3a、3aに電磁弁4を設けたもので、この
電磁弁4の弁体4aで前記通路3aを遮断しておき、プ
ランジャ5が回転及び往復動して燃料が所定量噴射され
たときに電磁弁4を作動させて、つまり弁体4aが通路
3aを開放することにより、プランジャ加圧室1の燃圧
が低下して燃料噴射が終了するように構成されるもので
ある。
To explain this in detail based on FIG. 4, this type of electromagnetic spill valve type distribution type fuel injection pump has a plunger pressurizing chamber 1
A solenoid valve 4 is provided in passages 3a, 3a that communicate with the pump chamber 2, which is a low pressure chamber in the pump housing. When the plunger rotates and reciprocates and a predetermined amount of fuel is injected, the solenoid valve 4 is operated, that is, the valve body 4a opens the passage 3a, thereby reducing the fuel pressure in the plunger pressurizing chamber 1 and injecting the fuel. It is configured so that the process ends.

すなわち、プランジャ5が回転連動しながらカムディス
ク6の方向に移動するにあたり、プランジャ5の吸入ス
リット7がバレル吸入ポート8から燃料油を吸入し、ポ
ート8を閉じたときからプランジャ5がリフトし、これ
によりプランジャ加圧室1及びプランジャ中央深穴9を
経由して吐出スリット10から燃料油がバレル吐出ボー
)11へ圧送され、デリバリバルブ12を開弁し燃料油
を噴射させる。このとき、弁体4aで遮断されていた通
路3aが、電磁弁4を作動させることにより開放され、
プランジャ加圧室1の燃圧が低下して燃料噴射が終了す
る。このようにして、電磁弁の開閉により噴射量の制御
が行われる。
That is, as the plunger 5 moves in the direction of the cam disc 6 while being interlocked with rotation, the suction slit 7 of the plunger 5 sucks fuel oil from the barrel suction port 8, and from when the port 8 is closed, the plunger 5 lifts. As a result, fuel oil is force-fed from the discharge slit 10 to the barrel discharge bow 11 via the plunger pressurizing chamber 1 and plunger central deep hole 9, and the delivery valve 12 is opened to inject the fuel oil. At this time, the passage 3a that was blocked by the valve body 4a is opened by operating the solenoid valve 4,
The fuel pressure in the plunger pressurizing chamber 1 decreases and fuel injection ends. In this way, the injection amount is controlled by opening and closing the solenoid valve.

(発明が解決しようとする問題点) ところで、エンジンでの良好な燃焼を得るためには、燃
料噴射ポンプにおいて高圧短期間の噴射が要求される。
(Problems to be Solved by the Invention) Incidentally, in order to obtain good combustion in the engine, high-pressure, short-term injection is required in the fuel injection pump.

これは特に直接噴射型のエンジンにとって重要である。This is especially important for direct injection engines.

これを実現させる方法について考察すると、 ■ニブランジャ径を大きくする ■:カム速度を大きくする ■:噴射系のデッドボリュームを低減することが考慮さ
れるべきであるところ、■については、受圧面積が大き
くなって高圧液密の点で好ましくなく、■においては、
面圧やカムジャンプによる限界を有するので、結局、上
記■に着目して開発を進めることが得策であると結論す
るに至った。
Considering how to achieve this, ■Increasing the nib lunger diameter■: Increasing the cam speed■:Reducing the dead volume of the injection system should be considered.For ■, the pressure receiving area is large. This is unfavorable in terms of high pressure liquid tightness, and in ■,
Since there are limitations due to surface pressure and cam jumps, we ultimately came to the conclusion that it would be a good idea to focus on the above point (2) and proceed with development.

上記着想に基いて従来の電磁スピルバルブ式分配型燃料
噴射ポンプを検討してみると1次に示すような改良すべ
き点が判明した。
When we examined the conventional electromagnetic spill valve distribution type fuel injection pump based on the above idea, we found that the following points should be improved.

すなわち、上記第4図に示されるように、従来のものは
、吸入スリット7が気筒数と同数設けられ、これが、一
箇所のみ設けであるバレル吸入ボート8から燃料油を吸
入し、これを前述のように、プランジャ中央深穴9を経
由して吐出スリット10からバレル吐出ボート11へ圧
送する構成を採るものである。この構成において、噴射
系デッドボリュームに属するものとして、気筒数と同数
設けられる吸入スリットと、プランジャ中央深穴、及び
吐出スリットが上げられるが、これらを備えた構成は、
基本的には、カットオフポートを有する機械式分配型燃
料噴射ポンプと同じであり、したがって第一に、電磁ス
ピルバルブ式分配型燃料噴射ポンプにおいては独自の構
成を採る余地があること、つまりプランジャにカットオ
フボートがない以上、プランジャ中央深穴は必然的でな
くなったこと、第二に、吸入スリットを気筒数と同数設
ける必要がないこと2の点に注目した。
That is, as shown in FIG. 4 above, in the conventional type, the number of suction slits 7 is equal to the number of cylinders, and this sucks fuel oil from the barrel suction boat 8, which is provided at only one place, and transfers it to the As shown in the figure, the configuration is such that the liquid is fed under pressure from the discharge slit 10 to the barrel discharge boat 11 via the deep hole 9 in the center of the plunger. In this configuration, the intake slits, which are provided in the same number as the number of cylinders, the plunger center deep hole, and the discharge slit, are included in the injection system dead volume.
Basically, it is the same as a mechanical distribution type fuel injection pump with a cut-off port, so firstly, there is room for a unique configuration in an electromagnetic spill valve type distribution type fuel injection pump, that is, the plunger We focused on two points: since there is no cut-off boat, a deep hole in the center of the plunger is no longer necessary, and secondly, there is no need to provide the same number of intake slits as the number of cylinders.

(問題点を解決するための手段) 本発明は、燃料噴射ポンプにおいて高圧短期間の噴射を
企図するにあたり、まず、噴射系のデッドボリュームを
低減する点に着目し、次いで電磁スピルバルブ式分配型
燃料噴射ポンプ独自の構成を機械式のものとの対比にお
いて考察した結果なされた。
(Means for Solving the Problems) In planning high-pressure short-term injection in a fuel injection pump, the present invention first focuses on reducing the dead volume of the injection system, and then This was done after considering the unique configuration of injection pumps in comparison with mechanical ones.

すなわち本発明は、この種の電磁スピルバルブ式分配型
燃料噴射ポンプにおいて、バレル吸入ボートをバレル吐
出ポートに対応させて気筒数と同数設け、さらに、プラ
ンジャの吸入スリットを一つだけ形成するとともに、こ
の吸入スリットでプランジャの吐出スリットを兼用させ
てなるものである。したがって、噴射系デッドボリュー
ムが大幅になくなり、高圧化に有利となる。
That is, the present invention provides this kind of electromagnetic spill valve distribution type fuel injection pump, in which the barrel suction boats are provided in the same number as the number of cylinders in correspondence with the barrel discharge ports, and only one suction slit is formed in the plunger. The suction slit also serves as the plunger's discharge slit. Therefore, the dead volume of the injection system is largely eliminated, which is advantageous for increasing the pressure.

(実施例) 以下に本発明を図示の一実施例に基いて説明する。尚、
従来例と共通の構成要素には同一の符号を付している。
(Example) The present invention will be described below based on an illustrated example. still,
Components common to those of the conventional example are given the same reference numerals.

第1図は本発明に係る分配型燃料噴射ポンプのプランジ
ャ及びバレル部分の縦断面図、第2図はm1図のA−A
矢視断面図を示すもので、同図において本発明は、バレ
ル吐出ボー)11は従来同様、気筒数と同数設けである
が、バレル吸入ボート8をバレル吐出ボー)11に対応
させて気筒数と同数設けている。さらに本発明では、プ
ランジャ5の吸入スリット7を一つだけ形成するととも
に、この吸入スリット7でプランジャの吐出スリットを
兼用させている。実施例では、吸入スリット7を従来の
ものに比べて若干長く形成している一方で、従来設けら
れていたプランジャ中央深穴は形成していない、又、均
圧スリット13は均圧グループ14に対してプランジャ
加圧室の側に形成され、均圧ボー)15はバレル中央近
くに設けている。このように構成した場合は、吸入スリ
、ドアが従来のものに比べ若干長く形成されているとい
っても、他の吸入スリットと、プランジャ中央深穴が存
在しないので、大幅に噴射系デッドボリュームを低減す
ることができる。この実施例の構成によると、デッドボ
リュームを小さくする部分が適正となり、カットオフ特
性が劣化することもなく、又カムリフトに伴う各ボート
の開孔線図に示される (第3図)ように、高圧短期間
の噴射を得ることができるものである。
Fig. 1 is a vertical sectional view of the plunger and barrel portion of the distribution type fuel injection pump according to the present invention, and Fig. 2 is A-A of the m1 diagram.
This figure shows a cross-sectional view taken in the direction of arrows, and in the present invention, the barrel discharge bow (11) is provided in the same number as the number of cylinders as in the conventional case, but the barrel suction boat (8) is made to correspond to the barrel discharge bow (11) to increase the number of cylinders. The same number is provided. Further, in the present invention, only one suction slit 7 of the plunger 5 is formed, and this suction slit 7 also serves as the discharge slit of the plunger. In the embodiment, while the suction slit 7 is formed slightly longer than the conventional one, the deep hole in the center of the plunger that was conventionally provided is not formed, and the pressure equalization slit 13 is formed in the pressure equalization group 14. On the other hand, the pressure equalizing bow (15), which is formed on the side of the plunger pressurizing chamber, is provided near the center of the barrel. With this configuration, even though the suction slit and door are slightly longer than conventional ones, the dead volume of the injection system is greatly reduced because there are no other suction slits or a deep hole in the center of the plunger. can be reduced. According to the configuration of this embodiment, the part that reduces the dead volume is appropriate, the cut-off characteristics do not deteriorate, and as shown in the hole diagram of each boat due to cam lift (Fig. 3), It is possible to obtain high-pressure, short-term injection.

(発明の効果) 本発明は以上説明したように、この種の電磁スピルバル
ブ式分配型燃料噴射ポンプを改良して、バレル吸入ボー
トをバレル吐出ボートに対応させて気筒数と同数設け、
さらに、プランジャの吸入スリットを一つだけ形成する
とともに、この吸入スリットでプランジャの吐出スリッ
トを兼用させてなるものであり、したがって従来のよう
に複数の吸入スリットが存在しないと同時に、プランジ
ャ中央深穴も存在しないので、大幅に噴射系デッドボリ
ュームを低減することができ、これにより高圧短期間の
噴射を得ることができる。しかも、プランジャの構造が
簡易化されるため、その製作工程が低減されることとな
り、その結果、製造コストの低廉化を図ることもできる
(Effects of the Invention) As explained above, the present invention improves this type of electromagnetic spill valve distribution type fuel injection pump, and provides the same number of barrel intake boats as the number of cylinders so as to correspond to the barrel discharge boats.
Furthermore, the plunger has only one suction slit, and this suction slit also serves as the plunger's discharge slit.Therefore, there are no multiple suction slits as in the past, and at the same time, the plunger has a deep hole in the center. Since there is also no dead volume in the injection system, it is possible to significantly reduce the dead volume of the injection system, thereby making it possible to obtain high-pressure, short-term injection. Furthermore, since the structure of the plunger is simplified, the number of manufacturing steps can be reduced, and as a result, manufacturing costs can be reduced.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明に係る分配型燃料噴射ポンプのプランジ
ャ及びバレル部分の縦断面図、第2図は第1図のA−A
矢視断面図、第3図はカムリフトに伴う各ボートの開孔
線図、第4図は従来の電磁スピルバルブ式分配型燃料噴
射ポンプを示す一部省略縦断面図である。
FIG. 1 is a longitudinal cross-sectional view of the plunger and barrel portion of a distribution type fuel injection pump according to the present invention, and FIG. 2 is a line AA in FIG. 1.
3 is a diagram showing the opening of each boat due to the cam lift, and FIG. 4 is a partially omitted longitudinal sectional view showing a conventional electromagnetic spill valve type distribution fuel injection pump.

Claims (1)

【特許請求の範囲】[Claims]  プランジャが回転及び往復動して燃料を分配噴射させ
、燃料噴射終了の制御は、プランジャ加圧室とポンプハ
ウジング内の低圧室とを連通する通路を電磁弁で開放す
ることにより行われる形式の分配型燃料噴射ポンプにお
いて、バレル吸入ポートをバレル吐出ポートに対応させ
て気筒数と同数設け、さらに、プランジャの吸入スリッ
トを一つだけ形成するとともに、この吸入スリットでプ
ランジャの吐出スリットを兼用させたことを特徴とする
分配型燃料噴射ポンプ。
A type of distribution in which the plunger rotates and reciprocates to distribute and inject fuel, and the end of fuel injection is controlled by opening a passage communicating between the plunger pressurizing chamber and the low pressure chamber in the pump housing using a solenoid valve. In a type fuel injection pump, the number of barrel suction ports is made to correspond to the barrel discharge ports, and the number is equal to the number of cylinders, and furthermore, only one intake slit for the plunger is formed, and this intake slit also serves as the discharge slit for the plunger. A distribution type fuel injection pump featuring:
JP8479386A 1986-04-12 1986-04-12 Distributor type fuel injection pump Pending JPS62243962A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8479386A JPS62243962A (en) 1986-04-12 1986-04-12 Distributor type fuel injection pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8479386A JPS62243962A (en) 1986-04-12 1986-04-12 Distributor type fuel injection pump

Publications (1)

Publication Number Publication Date
JPS62243962A true JPS62243962A (en) 1987-10-24

Family

ID=13840577

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8479386A Pending JPS62243962A (en) 1986-04-12 1986-04-12 Distributor type fuel injection pump

Country Status (1)

Country Link
JP (1) JPS62243962A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5000668A (en) * 1988-04-27 1991-03-19 Diesel Kiki Co., Ltd. Distribution-type fuel injection pump

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5000668A (en) * 1988-04-27 1991-03-19 Diesel Kiki Co., Ltd. Distribution-type fuel injection pump
DE3943576C2 (en) * 1988-04-27 1993-04-01 Zexel Corp., Tokio/Tokyo, Jp

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