JPS60204955A - Fuel feed pump - Google Patents

Fuel feed pump

Info

Publication number
JPS60204955A
JPS60204955A JP6247284A JP6247284A JPS60204955A JP S60204955 A JPS60204955 A JP S60204955A JP 6247284 A JP6247284 A JP 6247284A JP 6247284 A JP6247284 A JP 6247284A JP S60204955 A JPS60204955 A JP S60204955A
Authority
JP
Japan
Prior art keywords
fuel
air
valve
pump
inlet
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
JP6247284A
Other languages
Japanese (ja)
Inventor
Seiji Izuki
誠二 伊月
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.)
Yanmar Co Ltd
Original Assignee
Yanmar Diesel Engine 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 Yanmar Diesel Engine Co Ltd filed Critical Yanmar Diesel Engine Co Ltd
Priority to JP6247284A priority Critical patent/JPS60204955A/en
Publication of JPS60204955A publication Critical patent/JPS60204955A/en
Pending legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04Feeding by means of driven pumps
    • F02M37/046Arrangements for driving diaphragm-type pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/20Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines characterised by means for preventing vapour lock

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

PURPOSE:To easily extract the air in a fuel feed system by communicating the fuel inlet and fuel outlet via a bypass passage provided with a normall-closed valve. CONSTITUTION:An air extraction operation is performed when an engine is started, in this case, an air extraction valve provided on a fuel injection pump 3 is opened, and also the depression section 40 of the normally-closed valve 39 of the fuel feed pump 5 is depressed to open a bypass passage 38. The fuel inlet 32 and fuel outlet 33 of the fuel feed pump 5 are communicated to each other, and the air accumulated in a fuel feed pipe upstream the fuel feed pump 5 is discharged into a fuel tank from the first fuel return pipe through the feed pump 5 and an air extraction valve due to its buoyancy. The air in the fuel chamber of the fuel injection pump 3 is discharged into the fuel tank via the first fuel return pipe due to its buoyance by opening the air extraction valve.

Description

【発明の詳細な説明】 l超勤上の利用分*) 本発明は、ダイヤフラムを往復動させることによって燃
料を圧送するようにしたダイヤフラム式の燃料供給ポン
プに関するものである。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a diaphragm-type fuel supply pump that pumps fuel by reciprocating a diaphragm.

l従来技術) 従来のこの種のダイヤフラム−1caa供給ポンプは、
i3Nに示す如くポンプケーシング/30内に、ダイヤ
フラム/2ダによって区(2)された燃料加圧室7.2
9を形成するとともに、該燃料加圧室/29に後入側逆
止弁/36を備えた後入ロア3ダと、吐出側逆止弁/3
7を備えた吐出口/35とをそれぞれ杉成し、さらに前
記吸入口/3ダには吸入側オイルチャンバー730を介
して燃料入口/32を、また吐出口/3Sには吐出側オ
イルチャンバー/3/を介して燃料出口/33をそれぞ
れ連通せしめて構成されており、前記ダイヤフラム/2
1Iをカムシャフト/15のカム作用と一対のスプリン
グ12乙、72gのバネ力とによって厚さ方向に往復動
させることにより燃料入口132から吸入した燃料を燃
料加圧型/29内において加圧して燃料出口/33側に
吐出するようになっている。
1) Conventional diaphragm-1 caa supply pump of this kind is:
As shown in i3N, within the pump casing/30, there is a fuel pressurizing chamber 7.2 delimited (2) by a diaphragm/2 da.
9 and a rear entry lower 3da having a rear entry side check valve/36 in the fuel pressurizing chamber/29, and a discharge side check valve/3.
A fuel inlet /32 is connected to the suction port /3S via a suction side oil chamber 730, and a discharge port /35 is connected to the discharge port /3S through a suction side oil chamber 730. The fuel outlet /33 is connected to each other through the diaphragm /2.
By reciprocating the 1I in the thickness direction by the cam action of the camshaft/15 and the spring force of a pair of springs 12 and 72g, the fuel sucked in from the fuel inlet 132 is pressurized in the fuel pressurizing mold/29 to become fuel. It is designed to be discharged to the outlet/33 side.

ところが、このような従来の燃料供給ポンプ10Sにお
いては、エンジンの運転停止時にはダイヤフラム/2弘
が不作動とされるため、燃料入口“/3.2と燃料出口
/33とは相互に非連通とされる。従って、エンジンの
始動に先だって燃料供給系内のエア抜きを行なう場合に
は、プライミングシャフト/qOを何回も繰り返えし操
作し、ダイヤフラム/−≠を強制的に往復動させて燃料
入口/32(1aIの燃料をg5料出口/33側へ流通
させなければ燃料入口/32と燃料タンクC図示省略)
との間の燃料通路内にあるエアを抜くことができないな
どエア抜き作業が公営に煩雑であった。
However, in such a conventional fuel supply pump 10S, the diaphragm /2 is inactive when the engine is stopped, so the fuel inlet /3.2 and the fuel outlet /33 are not in communication with each other. Therefore, when bleeding air from the fuel supply system before starting the engine, operate the priming shaft/qO many times to force the diaphragm/-≠ to reciprocate. Fuel inlet/32 (Fuel inlet/32 and fuel tank C not shown unless the 1aI fuel flows to the g5 fuel outlet/33 side)
Air bleeding work was complicated for the public, as it was impossible to bleed out the air in the fuel passage between the fuel passage and the fuel passage.

C発明の目的) 本発明は、上記の如き従来の燃料供給ポンプの問題に鑑
み、燃料供給系内のエア抜きを轡易に行なえるようにし
た燃料供給ポンプを提供することを目的としてなされた
ものである。
C) Purpose of the Invention In view of the problems of conventional fuel supply pumps as described above, the present invention has been made with the object of providing a fuel supply pump that allows air in the fuel supply system to be easily vented. It is something.

を発明のIR成) 本発明の1g!1料供給ポンプは、ダイヤフラムによっ
て区画された燃料加圧室に、該燃料加圧室への燃料の流
入を許容する成人側逆止弁を備えた吸入口と、該a料加
圧至からの燃料の流出を許容する吐出側逆止弁を備えた
吐出口とをそれぞれ開口させ、1IIIidダイヤフラ
ムを往復動させることにより1lPi料入口から前記較
入口を介して前記+1llI料加圧苗内に燃料を吸入し
て加圧し、前記吐出口から燃料出口を介して吐出するよ
うにした燃料供給ポンプにおいて、前記燃料入口と前記
燃料出口とをバイパス通路を介して相互に連通せしめる
とともに該バイパス通路に以外的操作力によって開弁せ
しめられる常閉弁を取付けたことを特徴とするものであ
る。
IR composition of the invention) 1g of the invention! The first fuel supply pump has a fuel pressurizing chamber partitioned by a diaphragm, an inlet equipped with an adult-side check valve that allows fuel to flow into the fuel pressurizing chamber, and a fuel pressurizing chamber that is separated by a diaphragm. By opening the discharge ports each equipped with a check valve on the discharge side that allows fuel to flow out, and reciprocating the 1IIIid diaphragm, fuel is introduced into the pressurized seedlings from the 11Pi material inlet through the comparison inlet. In a fuel supply pump configured to draw in, pressurize, and discharge from the discharge port through the fuel outlet, the fuel inlet and the fuel outlet are communicated with each other via a bypass passage, and the bypass passage is provided with a It is characterized by being equipped with a normally closed valve that can be opened by operating force.

(実施例) 以下、本発明の燃料供給ポンプを実施例に基いて説明す
ると、m1図には車載用ディーゼルエンジンのシステム
図が斌されており、図中符号/はエンジン本体、2は該
エンジン本体/より上部位置に配箇された燃料タンク、
3はエンジン本体/の側部に取付けられた燃料@引ポン
プである。この燃料噴射ポンプ3には、その内部の燃料
チャンバーC図駅首略)に端んで取付けられたエア抜き
バルブ10とオーバーフローバルブ//とが取付けられ
ている。この燃料@射ポンプ3のエア抜きバルブ//と
燃料タンクλの下S(燃料M部)2φとは、その途中に
燃料フィルター9と後述の燃料供給ポンプSを取付けた
燃料供給系内によって接続されている。また該エア抜き
バルブ10と燃料タンク2の上部(9!旧部)2αとは
、第1燃料戻し管7によって接続されている。さらに、
1Pia噴射ポンプ3のオーバーフローバルブ//は、
前記エンジン/の各気筒に取付けた*@隨對弁q。
(Example) Hereinafter, the fuel supply pump of the present invention will be explained based on an example. Fig. m1 shows a system diagram of an on-vehicle diesel engine, and the symbol / in the figure is the engine body, and 2 is the engine. Main body/Fuel tank located at the upper position,
3 is a fuel pump attached to the side of the engine body. This fuel injection pump 3 is equipped with an air bleed valve 10 and an overflow valve attached to the end of the internal fuel chamber C (head omitted in Figure 3). The air bleed valve // of the fuel injection pump 3 and the lower S (fuel M part) 2φ of the fuel tank λ are connected through a fuel supply system in which a fuel filter 9 and a fuel supply pump S, which will be described later, are installed in the middle. has been done. Further, the air vent valve 10 and the upper part (9! old part) 2α of the fuel tank 2 are connected by a first fuel return pipe 7. moreover,
1Pia injection pump 3 overflow valve // is
*@隨對阀q attached to each cylinder of the said engine.

ダ、tlのリーク油通路(図玉省略)を介して第2燃料
戻し管gにより前記第1IPi料戻し管7の途中に連通
せしめられている。又、各燃料噴射弁ゲ。
The second fuel return pipe g communicates with the first IPi fuel return pipe 7 through leak oil passages (diagrams omitted) of DA and TL. Also, each fuel injection valve.

グ、qは、4圧燃料管/2./2./2によりそれぞれ
燃料噴射ポンプ3の燃料吐出部/3./3゜/3に接続
されている。
q, 4-pressure fuel pipe/2. /2. /2 respectively indicates the fuel discharge portion of the fuel injection pump 3 /3. /3°/3 is connected.

燃料供給ポンプSは、第2図に示す如く燃料噴射ポンプ
3の側壁を内外方向に貫通して歌付けられる第7ボンプ
ボデイ2ノと、該i/ポンプボディ2/の外端面2/α
にダイヤフラム、2IIを介して衝合合体せしめられる
アノポンプボディ22と、該第2ポンプボデイ、22の
外端面、225上にパツキンII6を介して衝合合体せ
しめられる抛3ポンプボディ23よりなるポンプボディ
20を有している。ダイヤフラム2ケには、ブツシュロ
ッド27を介してタペット、25が取付けられており、
該ダイヤフラム2’lは、タペット、25に転接する燃
料線側ポンプ3側のカムシャフト15のカム作用とタペ
ット、2jを付勢するタペットスプリング−乙のバネ力
とダイヤフラム、24’を付勢するダイヤフラムスプリ
ング2gのバネ力とにより厚さ方向に往復変位せしめら
れる。
As shown in FIG. 2, the fuel supply pump S includes a seventh pump body 2 which passes through the side wall of the fuel injection pump 3 in the inner and outer directions, and an outer end surface 2/α of the pump body 2.
A pump body consisting of an anno pump body 22 which is brought together through a diaphragm and 2II, and a three-way pump body 23 which is brought together on the outer end surface of the second pump body 22 and 225 through a seal II6. It has 20. A tappet 25 is attached to the two diaphragms via bushing rods 27.
The diaphragm 2'l is driven by the cam action of the camshaft 15 on the fuel line side pump 3 side that contacts the tappet 25, the spring force of the tappet spring B which biases the tappet 2j, and the diaphragm 24'. It is caused to reciprocate in the thickness direction by the spring force of the diaphragm spring 2g.

ダイヤフラム2tIと752ポンプボデイ22の間には
、該ダイヤフラム2’lの往復変位によりその容積が変
化せしめられる燃料加圧室29が形成されている。この
燃料加圧室コ9の第2ポンプボデイ、22側の室壁には
、該燃料加圧杢29への燃料流入を許容する吸入側逆止
弁3乙を備えた吸入口3’lと該燃料加圧室29からの
燃料流出を許容する吐出側逆止弁37を備えた吐出口3
jとが適宜離間して形成されている。さらに、この吸入
口3ダと吐出口3jは、第2ポンプボデイ22と第3ポ
ンプボデイ23の間に適宜離間して形成された適宜容積
の吸入側オイルチャンバー30と吐出側オイルチャンバ
ー3/とを介してそれぞれ燃料入口32と燃料出口33
に連通せしめられている。
A fuel pressurizing chamber 29 is formed between the diaphragm 2tI and the 752 pump body 22, the volume of which can be changed by reciprocating displacement of the diaphragm 2'l. The chamber wall on the second pump body and 22 side of this fuel pressurizing chamber 9 has an inlet 3'l equipped with an inlet check valve 3B that allows fuel to flow into the fuel pressurizing chamber 29. A discharge port 3 equipped with a discharge side check valve 37 that allows fuel to flow out from the fuel pressurization chamber 29
j are formed with appropriate spacing. Further, the suction port 3da and the discharge port 3j are connected to each other through a suction side oil chamber 30 and a discharge side oil chamber 3/ having an appropriate volume, which are formed at an appropriate distance between the second pump body 22 and the third pump body 23. and a fuel inlet 32 and a fuel outlet 33, respectively.
is communicated with.

尚、この燃料入口3.2と燃料出口33は、第1図に示
す如くタ;イヤフラム21の中心に対して放射状に形成
されており、燃料供給ポンプSの燃料噴射ポンプ3側へ
の取付状態においては、燃料人口32は斜下方に、また
燃料出口33は斜上方にそれぞれ開口せしめられる。
The fuel inlet 3.2 and the fuel outlet 33 are formed radially with respect to the center of the diaphragm 21, as shown in FIG. In this case, the fuel outlet 32 is opened obliquely downward, and the fuel outlet 33 is opened obliquely upward.

又、吸入側オイルチャンバー30と吐出側オイルチャン
バー3/とは、第3ポンプボデイ23に形成したバイパ
ス通路31rを介して相互に連通せしめられている。さ
らに、このバイパス通路31に形成したバルブシートt
3には、スプリングlSによって常時バイパス通v13
1を閉じる如く付勢される常閉弁39が取付けられてい
る。この常閉弁39は、その一端を第3ポンプボデイ2
3より外方に契出せしめてこれを押圧部lI0としてお
り、該押圧5IIoを手でその軸方向に押圧することに
より、弁体12をバルブシー)−1IJから強制的に離
間させてバイパス通路3gを開口させることができるよ
うになっている。尚、第2図において符号V+は、バル
ブシートt3と弁体t2の間に介在せしめられたシール
材(0リング)である。
Further, the suction side oil chamber 30 and the discharge side oil chamber 3/ are communicated with each other via a bypass passage 31r formed in the third pump body 23. Furthermore, a valve seat t formed in this bypass passage 31
3 has a constant bypass connection v13 by a spring lS.
A normally closed valve 39 which is biased to close the valve 1 is attached. This normally closed valve 39 has one end connected to the third pump body 2.
This is made to protrude outward from 3 and serves as a pressing portion lI0, and by manually pressing the pressing portion 5IIo in the axial direction, the valve body 12 is forcibly separated from the valve seat)-1IJ to open the bypass passage 3g. It can be opened. In addition, in FIG. 2, the symbol V+ is a sealing material (0 ring) interposed between the valve seat t3 and the valve body t2.

上述の如く構成された燃料供給ポンプSを備えた慾科供
給系の作用を簡単に説明すると、エンジン/の始動時に
はエア抜き操作を行なうが、その場合には、燃料噴射ポ
ンプ3に設けたエア抜きバルブ10を開くと同時に、燃
料供給ポンプ5の常閉弁39の押圧部lOを押圧操作し
てバイパス通路3gを開く。バイパス通路3gが開かれ
ると燃料供給ポンプSの燃料人口32と燃料出口33と
が相互に連通せしめられるため、該燃料供給ポンプSよ
り上流の燃料供給管6内に溜っていたエアはその浮力に
より燃料供給ポンプS及びエア抜きバルブ10を通って
易/燃料戻し管7かう燃料タンク2側に排出される。又
、燃料吠射ポンプ3のmsチャンバー内のエアは、エア
抜きバルブ10を開弁することにより第1燃料戻し管7
を介してその浮力により燃料タンクλ側に排出される。
To briefly explain the operation of the fuel supply system equipped with the fuel supply pump S configured as described above, an air bleeding operation is performed when starting the engine. At the same time as the vent valve 10 is opened, the pressing portion IO of the normally closed valve 39 of the fuel supply pump 5 is pressed to open the bypass passage 3g. When the bypass passage 3g is opened, the fuel port 32 and the fuel outlet 33 of the fuel supply pump S are brought into communication with each other, so that the air accumulated in the fuel supply pipe 6 upstream of the fuel supply pump S is released due to its buoyancy. The fuel is discharged through the fuel supply pump S and the air bleed valve 10 to the fuel tank 2 side through the easy/fuel return pipe 7. Furthermore, the air in the ms chamber of the fuel injection pump 3 is released into the first fuel return pipe 7 by opening the air vent valve 10.
Due to its buoyancy, the fuel is discharged to the fuel tank λ side.

尚、この際、g5料供給管6と第7燃料戻し管7とが燃
料供給ポンプ5のバイパス通路3gを介して連通せしめ
られているため、燃料供給管6内のエア及び燃料噴射ポ
ンプ3内のエアが第1f1料戻し管7を介してIFt料
タンクλ側に排出されると、該排出エアの量に対応した
童だけ燃料タンク2側から燃料供給管6側に燃料が流出
し、この燃料の流通作用により燃料供給管6内あるいは
燃料供給ポンプS内に残留していたエアl即ち、浮力の
みで+、t we出できなかったエア)が第1燃料戻し
管7側に押し出されることになる(即ち、エア抜き作用
が促進されることになる)。
At this time, since the G5 fuel supply pipe 6 and the seventh fuel return pipe 7 are communicated via the bypass passage 3g of the fuel supply pump 5, the air in the fuel supply pipe 6 and the fuel injection pump 3 are When the air of Due to the flow of fuel, the air remaining in the fuel supply pipe 6 or the fuel supply pump S (that is, the air that could not be discharged due to buoyancy alone) is pushed out to the first fuel return pipe 7 side. (In other words, the air bleed action is promoted.)

エア抜き作業が終了すると、エア抜きバルブ10を閉め
るとともに、燃料供給ポンプ5の押圧部110に対する
押圧力を解除してバイパス通路3Irを閉じる。バイパ
ス通路3gが閉じられると燃料入口32と燃料出口33
が非連通とされるため、燃料供給ポンプ5はダイヤフラ
ム、211が往復変位することにより所定のポンプ作用
を行ない、燃料入口32から吸入した燃料を燃料加圧M
29内において加圧し、これを燃料出口33から燃料噴
射ポンプ3側に圧送する如く作用する。
When the air bleeding operation is completed, the air bleeding valve 10 is closed, and the pressing force on the pressing portion 110 of the fuel supply pump 5 is released to close the bypass passage 3Ir. When the bypass passage 3g is closed, the fuel inlet 32 and the fuel outlet 33
Since the diaphragm 211 is disconnected, the fuel supply pump 5 performs a predetermined pumping action by reciprocating the diaphragm 211, and pressurizes the fuel sucked from the fuel inlet 32.
It acts to pressurize inside 29 and forcefully send it from the fuel outlet 33 to the fuel injection pump 3 side.

1発明の効果) 本発明の燃料供給ポンプは、燃料入口と燃料出口とをバ
イパスするバイパス通路に外部操作力により開弁する常
閉弁を設けているため、エア抜き作業時には該常閉弁を
開弁じてバイパス通路を開口させるという簡単ない作を
行なうことのみにより該燃料供給ポンプより上流側のf
Fa料通路内のエアを下流側の燃料通路を介して燃料タ
ンクへ、あるいはtII燃料供給ポンプより下流側の燃
料通路内のエアを上流側の燃料通路を介して燃料タンク
側へその浮力により容易に排出させることができ、従来
の燃料供給ポンプ183図参照)の如くエア抜き時にブ
ライミング機構を何回も繰り返えして操作したりする必
要がなく、それだけエア抜き作業を容易且つスピーディ
に行なうことができるという効果がある。
1 Effects of the Invention) The fuel supply pump of the present invention is provided with a normally closed valve that is opened by an external operating force in the bypass passage that bypasses the fuel inlet and the fuel outlet. By simply performing the simple operation of opening the bypass passage by opening the valve, the f on the upstream side of the fuel supply pump can be
Air in the Fa fuel passage can be easily transferred to the fuel tank via the downstream fuel passage, or air in the fuel passage downstream of the tII fuel supply pump can be easily transferred to the fuel tank via the upstream fuel passage. Unlike conventional fuel supply pumps (see Figure 183), there is no need to repeatedly operate the briming mechanism during air bleeding, making air bleeding easier and faster. It has the effect of being able to

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

第7図は本発明実施例に係る燃料供給ポンプを備えたデ
ィーゼルエンジンのシステム図、第2図は纂/因に本し
たf15料供給ポンプの拡大縦断面図、第3因は従来構
造の燃料供給ポンプの縦断面図である。 2t・・・・ダイヤフラム 29・・・・燃料加圧型 32・・・・燃料入口 33・・・・燃料出口 3II・・・・吸入口 35・・・・吐出口 3乙・・・・吸入側逆止弁 37・・・・吐出側逆止弁
Fig. 7 is a system diagram of a diesel engine equipped with a fuel supply pump according to an embodiment of the present invention, Fig. 2 is an enlarged vertical cross-sectional view of an F15 fuel supply pump, which was originally published as a summary, and the third factor is a system diagram of a diesel engine equipped with a fuel supply pump according to an embodiment of the present invention. FIG. 3 is a longitudinal cross-sectional view of the supply pump. 2t...Diaphragm 29...Fuel pressurization type 32...Fuel inlet 33...Fuel outlet 3II...Suction port 35...Discharge port 3O...Suction side Check valve 37...Discharge side check valve

Claims (1)

【特許請求の範囲】[Claims] /、ダイヤフラム(2tI)によって区内された111
!i料加肚室(2ワ)に、該燃料加圧室(29)への燃
料の流入を許容する後入側逆止弁(36)を備えた吸入
口13 L)と、該燃料加圧室(,29)からの燃料の
流出を許牲する吐出側逆出弁(37)を備えた吐出口(
35)とをそれぞれ開口させ、前記ダイヤフラムt2’
l)を往復動させることにより燃料入口(32)から前
記吸入口(31)を介して前記燃料加圧室C2ワ)内に
燃料を吸入して加圧し、前記吐呂口135)から燃料出
口/33)を介して吐出するようにした燃料供給ポンプ
であって、前記燃料入口(3,!>と前記燃料出口(3
3)とが両者間にまたがって形成したバイパス通路(3
g)を介して相互に連通せしめられており、さらに該バ
イパス通路(3t)には外的操作力によって開弁せしめ
られる常閉弁139)が取付けられていることを特徴と
する燃料供給ポンプ。
/, 111 bounded by diaphragm (2tI)
! The fuel heating chamber (2W) is provided with an inlet 13 L) equipped with a rear entry side check valve (36) that allows fuel to flow into the fuel pressurizing chamber (29), and the fuel pressurizing chamber (29) A discharge port (, 29) equipped with a discharge side return valve (37) that allows fuel to flow out from the chamber (, 29).
35) are opened respectively, and the diaphragm t2'
By reciprocating the fuel inlet (32) through the suction port (31), fuel is sucked into the fuel pressurizing chamber C2 (W) and pressurized, and the fuel is drawn into the fuel pressurizing chamber C2 (W) through the spout port (135) and into the fuel outlet. /33), the fuel supply pump is configured to discharge fuel through the fuel inlet (3,!>) and the fuel outlet (3,!).
3) and a bypass passageway (3) formed between the two.
g), and the bypass passage (3t) is further equipped with a normally closed valve 139) which is opened by an external operating force.
JP6247284A 1984-03-29 1984-03-29 Fuel feed pump Pending JPS60204955A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6247284A JPS60204955A (en) 1984-03-29 1984-03-29 Fuel feed pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6247284A JPS60204955A (en) 1984-03-29 1984-03-29 Fuel feed pump

Publications (1)

Publication Number Publication Date
JPS60204955A true JPS60204955A (en) 1985-10-16

Family

ID=13201163

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6247284A Pending JPS60204955A (en) 1984-03-29 1984-03-29 Fuel feed pump

Country Status (1)

Country Link
JP (1) JPS60204955A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997049916A1 (en) * 1996-06-26 1997-12-31 Robert Bosch Gmbh Fuel supply pump for a fuel injection pump for internal combustion engines
US6622702B2 (en) * 2000-03-14 2003-09-23 Isuzu Motors Limited Common rail fuel injection device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997049916A1 (en) * 1996-06-26 1997-12-31 Robert Bosch Gmbh Fuel supply pump for a fuel injection pump for internal combustion engines
US6622702B2 (en) * 2000-03-14 2003-09-23 Isuzu Motors Limited Common rail fuel injection device

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