JPH0256511B2 - - Google Patents
Info
- Publication number
- JPH0256511B2 JPH0256511B2 JP59107070A JP10707084A JPH0256511B2 JP H0256511 B2 JPH0256511 B2 JP H0256511B2 JP 59107070 A JP59107070 A JP 59107070A JP 10707084 A JP10707084 A JP 10707084A JP H0256511 B2 JPH0256511 B2 JP H0256511B2
- Authority
- JP
- Japan
- Prior art keywords
- valve
- backflow
- valve body
- fuel
- delivery
- 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.)
- Expired - Lifetime
Links
- 239000000446 fuel Substances 0.000 claims description 46
- 238000002347 injection Methods 0.000 claims description 24
- 239000007924 injection Substances 0.000 claims description 24
- 238000010521 absorption reaction Methods 0.000 claims description 10
- 238000009751 slip forming Methods 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
- F02M59/46—Valves
- F02M59/462—Delivery valves
Description
【発明の詳細な説明】
＜産業上の利用分野＞
この発明は、デイーゼルエンジンに用いられる
燃料噴射ポンプに関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a fuel injection pump used in a diesel engine.
＜従来技術＞
デイーゼルエンジンにおいては、燃料の完全燃
焼を行わせるために、燃料噴射系統に噴射後期に
おける“あとだれ”を防止した燃料噴射の切れを
よくした特性が要求される。このような特性を得
るために、従来は噴射ポンプのプランジヤ径を大
きくし、かつ、噴射ノルズ側に装備した噴射弁の
開弁座を高くして、高圧の燃料を短時間に噴射す
ることが行われていた。<Prior Art> In a diesel engine, in order to achieve complete combustion of fuel, the fuel injection system is required to have characteristics that improve the sharpness of the fuel injection and prevent "drip" in the later stages of injection. In order to obtain these characteristics, conventional methods have been able to inject high-pressure fuel in a short time by increasing the plunger diameter of the injection pump and raising the opening seat of the injection valve installed on the injection nozzle side. It was done.
＜発明が解決しようとする問題点＞
しかし、高圧噴射を行うと、噴射終了後に燃料
供給管内に生じる圧力波が噴射ポンプに内装した
送出弁とノルズとの間を往復し、ノルズの噴射弁
を僅かに再び開き、二次噴射をもたらす問題があ
つた。<Problems to be Solved by the Invention> However, when high-pressure injection is performed, the pressure waves generated in the fuel supply pipe after the end of injection travel back and forth between the delivery valve built into the injection pump and the Nords, causing the Nords injection valve to There was a problem with it opening slightly again, resulting in a secondary injection.
この発明は、ポンプ内の送出弁部に改良を加え
ることで供給管内の反射波吸収を可能にして二次
噴射の発生を防止できるようにしたものである。 This invention makes it possible to absorb reflected waves in the supply pipe by improving the delivery valve section in the pump, thereby making it possible to prevent the occurrence of secondary injection.
＜問題を解決するための手段＞
このために、本発明では、燃料供給管６側に向
かう燃料通路１９中に逆流用弁体摺動部２０と送
出弁収容部２１とを連続して形成し、弁収容部２
１を弁体摺動部２０より燃料供給管６側に位置さ
せるとともに、弁体摺動部２０より大径に形成
し、弁収容部２１の弁体摺動部２０側端部に弁座
１８を形成し、弁収容部２１内の送出弁９を閉弁
バネ８で閉弁方向に弾圧付勢して、弁座１８を送
出弁９で閉弁可能に構成し、送出弁９の下端部９
ａから軸部９ａを弁体摺動部２０内に延出形成し
て、この軸部９ａに逆流用弁体１２を装着し、逆
流用弁体１２を逆流用バネ１３で弁収容部２１側
に弾圧付勢するとともに、軸部９ａに形成したス
トツパー部１４で受止めるように構成し、かつ、
逆流用弁体１２を軸部９ａの外周面と弁体摺動部
２０の内周面とに液密状で摺動可能に構成し、燃
料供給管６側からの燃料逆流を許す逆流用流路１
１を送出弁９の肉壁内と軸部９ａの肉壁内とに亘
つて形成するとともに、軸部９ａの外周面のうち
送出弁９の下端部９ｂとストツパー部１４間に開
口して、送出弁９と逆流用弁体１２との間に形成
される逆流吸収室２２を逆流用流路１１を介し弁
収容部２１に連通し、燃料加圧によつて送出弁９
が燃料供給管６側に移動して逆流用弁体１２が弁
座１８を通過した状態で開弁するように構成し、
送出弁９が弁座１８を閉じる閉弁状態において燃
料供給管９の内圧上昇に伴つて逆流用弁体１２が
逆流用バネ１３に抗して軸部９ａを摺動移動する
ことにより、逆流吸収室２２を密閉状態に保つと
ともに、逆流吸収室２２内への燃料逆流を許す構
成を採用した。<Means for Solving the Problem> To this end, in the present invention, the backflow valve element sliding portion 20 and the delivery valve accommodating portion 21 are continuously formed in the fuel passage 19 toward the fuel supply pipe 6 side. , valve housing part 2
1 is located closer to the fuel supply pipe 6 side than the valve body sliding part 20, and is formed to have a larger diameter than the valve body sliding part 20, and the valve seat 18 is located at the end of the valve housing part 21 on the valve body sliding part 20 side. The delivery valve 9 in the valve accommodating portion 21 is elastically biased in the valve closing direction by the valve closing spring 8 so that the valve seat 18 can be closed by the delivery valve 9, and the lower end of the delivery valve 9 9
A shaft portion 9a is formed to extend into the valve body sliding portion 20 from a, and a backflow valve body 12 is attached to this shaft portion 9a, and the backflow valve body 12 is attached to the valve housing portion 21 side with a backflow spring 13. It is configured to be elastically biased and received by a stopper portion 14 formed on the shaft portion 9a, and
The backflow valve body 12 is configured to be slidable in a liquid-tight manner on the outer circumferential surface of the shaft portion 9a and the inner circumferential surface of the valve body sliding portion 20, thereby allowing backflow of fuel from the fuel supply pipe 6 side. Road 1
1 is formed within the wall of the delivery valve 9 and the wall of the shaft portion 9a, and is opened between the lower end portion 9b of the delivery valve 9 and the stopper portion 14 on the outer peripheral surface of the shaft portion 9a, A backflow absorption chamber 22 formed between the delivery valve 9 and the backflow valve body 12 is communicated with the valve accommodating portion 21 via the backflow passage 11, and the delivery valve 9 is opened by pressurizing the fuel.
moves toward the fuel supply pipe 6 side and the backflow valve body 12 passes through the valve seat 18 and opens the valve,
In the closed state where the delivery valve 9 closes the valve seat 18, as the internal pressure of the fuel supply pipe 9 increases, the backflow valve body 12 slides on the shaft portion 9a against the backflow spring 13, thereby absorbing backflow. A configuration is adopted in which the chamber 22 is kept in a sealed state and fuel backflow into the backflow absorption chamber 22 is allowed.
＜作用＞
燃料加圧により、送出弁９とこの送出弁９の軸
部９ａに装着した逆流用弁体１２とが一体となつ
て燃料供給管６側に移動し、逆流用弁体１２が弁
座１８を通過すると、弁体摺動部２０と弁収容部
２１とが連通し、開弁される。<Operation> By pressurizing the fuel, the delivery valve 9 and the backflow valve body 12 attached to the shaft portion 9a of the delivery valve 9 move together toward the fuel supply pipe 6, and the backflow valve body 12 closes the valve. When passing the seat 18, the valve body sliding part 20 and the valve housing part 21 communicate with each other, and the valve is opened.
一方、送出弁９が弁座１８を閉じる閉弁状態で
燃料供給管６の内圧が上昇するにつれて、逆流用
弁体１２が軸部９ａを逆流用バネ１３に抗して摺
動移動する。このとき、逆流吸収室２２は密閉状
態に保たれたままで、逆流吸収室２２内に燃料が
流入して、燃料供給管６の内圧上昇が抑制され
る。同時に、燃料供給管６内の内圧が高く保たれ
る。 On the other hand, as the internal pressure of the fuel supply pipe 6 increases in the closed state where the delivery valve 9 closes the valve seat 18, the backflow valve body 12 slides on the shaft portion 9a against the backflow spring 13. At this time, fuel flows into the backflow absorption chamber 22 while the backflow absorption chamber 22 is kept in a sealed state, and an increase in the internal pressure of the fuel supply pipe 6 is suppressed. At the same time, the internal pressure within the fuel supply pipe 6 is kept high.
＜実施例＞
第１図に燃料噴射系の全体が示される。燃料タ
ンク１の燃料はフイルター２を経て噴射ポンプ３
に供給される。ポンプ３はカム４によつて間欠的
に駆動され、コントロールラツク５で調節された
流量の加圧燃料が供給管６を介して噴射ノルズ７
に圧送される。<Example> FIG. 1 shows the entire fuel injection system. The fuel in the fuel tank 1 passes through the filter 2 to the injection pump 3.
supplied to The pump 3 is intermittently driven by a cam 4, and pressurized fuel at a flow rate adjusted by a control rack 5 is delivered to an injection nozzle 7 via a supply pipe 6.
is pumped to.
第２図に示すように噴射ポンプ３の送出部で
は、燃料通路１９中に逆流用弁体摺動部２０と弁
収容部２１とが連続して形成されており、弁収容
部２１は弁体摺動部２０よりも燃料供給管６側に
位置し、かつ弁体摺動部２０よりも大径に形成さ
れている。 As shown in FIG. 2, in the delivery portion of the injection pump 3, a backflow valve sliding portion 20 and a valve accommodating portion 21 are continuously formed in the fuel passage 19, and the valve accommodating portion 21 is connected to the valve accommodating portion 21. It is located closer to the fuel supply pipe 6 than the sliding portion 20 and is formed to have a larger diameter than the valve body sliding portion 20 .
弁収容部２１には、燃料加圧によつて開動する
送出弁９が閉弁バネ８によつて閉弁方向に弾圧付
勢されており、弁収容部２１の弁体摺動部２０側
端部の段付き部に形成された弁座１８を閉弁する
ようになつている。 In the valve accommodating portion 21, a delivery valve 9 that opens when fuel is pressurized is elastically biased in the valve closing direction by a valve closing spring 8. The valve seat 18 formed in the stepped part of the valve is closed.
また、弁収容部２１の上方は送出路１０を介し
て燃料供給管６に通じており、送出路１０から送
出弁９内への燃料逆流を許す逆流用流路１１が送
出弁９に形成されるとともに、送出弁９の下端部
９ｂから下方プランジヤ側に延出した軸部９ａ
に、逆流用流路１１よりも下方において上下摺動
自在なカラー状の逆流用弁体１２が装着されてい
る。 Further, the upper part of the valve accommodating portion 21 communicates with the fuel supply pipe 6 via the delivery passage 10, and a backflow passage 11 is formed in the delivery valve 9 to allow fuel to flow back from the delivery passage 10 into the delivery valve 9. and a shaft portion 9a extending from the lower end portion 9b of the delivery valve 9 toward the lower plunger side.
A collar-shaped backflow valve body 12 that is vertically slidable is attached below the backflow channel 11.
逆流用弁体１２は逆流用バネ１３で軽く上方に
付勢されるとともに、その上限が軸部９ａに形成
したストツパー部（段付き部）１４によつて規制
されている。 The backflow valve body 12 is lightly urged upward by a backflow spring 13, and its upper limit is regulated by a stopper portion (stepped portion) 14 formed on the shaft portion 9a.
そして、送出弁９と逆流用弁体１２との間に逆
流吸収室２２が形成され、逆流用流路１１を介し
て弁収容部２１に連通している。 A backflow absorption chamber 22 is formed between the delivery valve 9 and the backflow valve body 12, and communicates with the valve accommodating portion 21 via the backflow flow path 11.
また、軸部９ａの下端には上記逆流用バネ１３
の下端を受けるカラー１５が取付けられるととも
に、軸部９ａの下半部にバネ室１６と下方のプラ
ンジヤ側とを連通する流路１７が形成され、か
つ、この流路１７は逆流用弁体１２が一定以上下
方に後退移動されると、上記逆流用流路１１に連
通するよう上端開口１７ａが形成されている。 Further, the backflow spring 13 is provided at the lower end of the shaft portion 9a.
A collar 15 for receiving the lower end is attached, and a passage 17 communicating between the spring chamber 16 and the lower plunger side is formed in the lower half of the shaft portion 9a, and this passage 17 is connected to the backflow valve body 12. An upper end opening 17a is formed so as to communicate with the backflow flow path 11 when the backflow is moved downward by a certain amount or more.
次に、上記ポンプ３の作動を説明する。 Next, the operation of the pump 3 will be explained.
カム４によつてプランジヤ側の燃料加圧が行わ
れると、送出弁９は第２図の状態のまま閉弁バネ
８に抗して上昇し、逆流用弁体１２が弁座１８を
通過することによつて加圧燃料が送出路１０に送
り出される。 When the cam 4 pressurizes the fuel on the plunger side, the delivery valve 9 rises against the valve closing spring 8 in the state shown in FIG. 2, and the backflow valve body 12 passes through the valve seat 18. As a result, pressurized fuel is delivered to the delivery channel 10.
燃料圧送が終了してプランジヤー側の圧がなく
なると、送出弁９が閉弁バネ８によつて下降され
て弁座１８に接当し閉弁される。この場合、ノル
ズ側の噴射弁閉弁作動に伴つて供給管内に圧力波
が生じるが、この圧力は逆流用流路１１を介して
逆流用弁体１２に作用するため、逆流用弁体１２
が逆流用バネ１３に抗して下方に後退し、管内圧
力が逆流吸収室２２に吸収される。圧力波が強力
な場合には逆流用弁体１２が大きく後退して軸部
９ａの開口部１７ａを越え、管内圧力は逆流用流
路１１、開口１７ａ、及び流路１７を介してプラ
ンジヤー側に逃がされる。 When the pressure on the plunger side disappears after pressure feeding of fuel is completed, the delivery valve 9 is lowered by the valve closing spring 8 and comes into contact with the valve seat 18 to be closed. In this case, a pressure wave is generated in the supply pipe as the injection valve on the Nords side closes, but this pressure acts on the backflow valve element 12 via the backflow flow path 11.
retreats downward against the backflow spring 13, and the pressure inside the pipe is absorbed into the backflow absorption chamber 22. When the pressure wave is strong, the backflow valve body 12 moves back significantly and exceeds the opening 17a of the shaft portion 9a, and the pressure inside the pipe is transferred to the plunger side via the backflow flow path 11, the opening 17a, and the flow path 17. be let go.
＜効果＞
以上説明したように、本発明によれば噴射終了
時に供給管内に発生した圧力波を弁体の摺動変位
によつて密閉状態の逆流吸収室に吸収することが
でき、二次噴射を確実に阻止することができると
ともに、燃料供給管の内圧を正常に保持でき、噴
射率を高く保つことができる。<Effects> As explained above, according to the present invention, the pressure waves generated in the supply pipe at the end of injection can be absorbed into the sealed backflow absorption chamber by the sliding displacement of the valve body, and the secondary injection In addition to being able to reliably prevent this, the internal pressure of the fuel supply pipe can be maintained at a normal level, and the injection rate can be maintained at a high level.
図面は本発明の実施例を示し、第１図は燃料噴
射系の全体構成図、第２図は燃料噴射ポンプの送
出部を示す拡大断面図である。
６……燃料供給管、８……閉弁バネ、９……送
出弁、１１……逆流用流路、１２……逆流用弁
体、１３……逆流用バネ、１８……弁座、２０…
…逆流用弁体摺動部、２１……送出弁収容部、２
２……ストツパー部。
The drawings show an embodiment of the present invention, and FIG. 1 is an overall configuration diagram of a fuel injection system, and FIG. 2 is an enlarged sectional view showing a delivery section of a fuel injection pump. 6...Fuel supply pipe, 8...Valve closing spring, 9...Delivery valve, 11...Reverse flow channel, 12...Reverse flow valve element, 13...Reverse flow spring, 18...Valve seat, 20 …
...Reverse flow valve body sliding part, 21... Delivery valve housing part, 2
2... Stopper section.
Claims (1)
流用弁体摺動部２０と送出弁収容部２１とを連続
して形成し、弁収容部２１を弁体摺動部２０より
燃料供給管６側に位置させるとともに、弁体摺動
部２０より大径に形成し、 弁収容部２１の弁体摺動部２０側端部に弁座１
８を形成し、弁収容部２１内の送出弁９を閉弁バ
ネ８で閉弁方向に弾圧付勢して、弁座１８を送出
弁９で閉弁可能に構成し、 送出弁９の下端部９ｂから軸部９ａを弁体摺動
部２０内に延出形成して、この軸部９ａに逆流用
弁体１２を装着し、 逆流用弁体１２を逆流用バネ１３で弁収容部２
１側に弾圧付勢するとともに、軸部９ａに形成し
たストツパー部１４で受止めるように構成し、か
つ、逆流用弁体１２を軸部９ａの外周面と弁体摺
動部２０の内周面とに液密状で摺動可能に構成
し、 燃料供給管６側からの燃料逆流を許す逆流用流
路１１を送出弁９の肉壁内と軸部９ａの肉壁内と
に亘つて形成するとともに、軸部９ａの外周面の
うち送出弁９の下端部９ｂとストツパー部１４間
に開口して、送出弁９と逆流用弁体１２との間に
形成される逆流吸収室２２を逆流用流路１１を介
して弁収容部２１に連通し、 燃料加圧によつて送出弁９が燃料供給管６側に
移動して逆流用弁体１２が弁座１８を通過した状
態で開弁するように構成し、 送出弁９が弁座１８を閉じる閉弁状態において
燃料供給管９の内圧上昇に伴つて逆流用弁体１２
が逆流用バネ１３に抗して軸部９ａを摺動移動す
ることにより、逆流吸収室２２を密閉状態に保つ
とともに、逆流吸収室２２内への燃料逆流を許す
ように構成したことを特徴とする燃料噴射ポン
プ。[Claims] 1. A backflow valve sliding portion 20 and a delivery valve accommodating portion 21 are continuously formed in the fuel passage 19 toward the fuel supply pipe 6 side, and the valve accommodating portion 21 is connected to the valve body sliding portion 21. The valve seat 1 is located closer to the fuel supply pipe 6 side than the valve body sliding part 20 and has a larger diameter than the valve body sliding part 20 .
8, the delivery valve 9 in the valve accommodating portion 21 is elastically biased in the valve closing direction by the valve closing spring 8, and the valve seat 18 is configured to be able to be closed by the delivery valve 9, and the lower end of the delivery valve 9. A shaft portion 9a is formed to extend from the portion 9b into the valve body sliding portion 20, a backflow valve body 12 is attached to this shaft portion 9a, and the backflow valve body 12 is attached to the valve housing portion 2 with a backflow spring 13
1 side, and is configured to be received by a stopper portion 14 formed on the shaft portion 9a, and the backflow valve body 12 is disposed between the outer circumferential surface of the shaft portion 9a and the inner circumference of the valve body sliding portion 20. A backflow passage 11 that allows backflow of fuel from the fuel supply pipe 6 side is provided within the wall of the delivery valve 9 and the wall of the shaft portion 9a. At the same time, a backflow absorption chamber 22 is opened between the lower end 9b of the delivery valve 9 and the stopper part 14 on the outer peripheral surface of the shaft portion 9a, and is formed between the delivery valve 9 and the backflow valve body 12. It communicates with the valve accommodating part 21 via the backflow passage 11, and opens when the delivery valve 9 moves toward the fuel supply pipe 6 side by fuel pressurization and the backflow valve body 12 passes through the valve seat 18. In the closed state where the delivery valve 9 closes the valve seat 18, as the internal pressure of the fuel supply pipe 9 increases, the backflow valve body 12
By sliding the shaft portion 9a against the backflow spring 13, the backflow absorption chamber 22 is kept in a sealed state, and at the same time, fuel is allowed to flow back into the backflow absorption chamber 22. fuel injection pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10707084A JPS60249664A (en) | 1984-05-25 | 1984-05-25 | Fuel injection pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10707084A JPS60249664A (en) | 1984-05-25 | 1984-05-25 | Fuel injection pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60249664A JPS60249664A (en) | 1985-12-10 |
| JPH0256511B2 true JPH0256511B2 (en) | 1990-11-30 |
Family
ID=14449722
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10707084A Granted JPS60249664A (en) | 1984-05-25 | 1984-05-25 | Fuel injection pump |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60249664A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5012785A (en) * | 1989-06-28 | 1991-05-07 | General Motors Corporation | Fuel injection delivery valve with reverse flow venting |
| JPH05272429A (en) * | 1992-03-25 | 1993-10-19 | Mitsubishi Motors Corp | Fuel injector |
| US5287838A (en) * | 1993-02-26 | 1994-02-22 | Caterpillar Inc. | Compact reverse flow check valve assembly for a unit fluid pump-injector |
| DE19535368C2 (en) * | 1995-09-25 | 1998-04-30 | Bosch Gmbh Robert | Fuel injection device for internal combustion engines |
| GB9701688D0 (en) * | 1997-01-28 | 1997-03-19 | Lucas Ind Plc | Valve |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56110556A (en) * | 1980-02-05 | 1981-09-01 | Nippon Denso Co Ltd | Discharge valve for fuel injection pump of internal combustion engine |
| JPS5865966A (en) * | 1981-09-25 | 1983-04-19 | ロ−ベルト・ボツシユ・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング | Fuel injection pump for internal combustion engine |
-
1984
- 1984-05-25 JP JP10707084A patent/JPS60249664A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56110556A (en) * | 1980-02-05 | 1981-09-01 | Nippon Denso Co Ltd | Discharge valve for fuel injection pump of internal combustion engine |
| JPS5865966A (en) * | 1981-09-25 | 1983-04-19 | ロ−ベルト・ボツシユ・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング | Fuel injection pump for internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60249664A (en) | 1985-12-10 |
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