JPS62131970A - Fuel overflow valve - Google Patents
Fuel overflow valveInfo
- Publication number
- JPS62131970A JPS62131970A JP27309585A JP27309585A JPS62131970A JP S62131970 A JPS62131970 A JP S62131970A JP 27309585 A JP27309585 A JP 27309585A JP 27309585 A JP27309585 A JP 27309585A JP S62131970 A JPS62131970 A JP S62131970A
- Authority
- JP
- Japan
- Prior art keywords
- fuel
- pressure regulating
- regulating valve
- valve
- pressure
- 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
Landscapes
- Fuel-Injection Apparatus (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、燃料オーバーフローバルブに関し、特に開弁
圧、開口面積を低速から高速へかけて適時変化させるこ
との出来る燃料オーバーフローバルブに関するものであ
る。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a fuel overflow valve, and more particularly to a fuel overflow valve that can change valve opening pressure and opening area as appropriate from low speed to high speed. .
従来、副型噴射ポンプの燃料供給方式は一般に噴射ポン
プのカム軸で駆動される燃料フィードポンプによって噴
射ポンプ本体に送り込む方式がとられているが、その系
統図は第４図に示す通りで、第４図において噴射ポンプ
のカム軸１３で駆動される燃料フィードポンプ１２によ
り送り込まれた燃料は、燃料フィルタ１４を経てプラン
ジャバレル１５内に充填され、往復動をするプランジャ
１６で噴射ノズル１９を介して機関に送り込まれるが、
プランジャ１６より送り込まれる燃料以外の余剰燃料は
燃料オーバーフローバルブ１８によって燃料タンク１１
へ戻される。Conventionally, the fuel supply method for sub-injection pumps has generally been to feed fuel into the injection pump body using a fuel feed pump driven by the camshaft of the injection pump, and the system diagram is shown in Figure 4. In FIG. 4, fuel fed by a fuel feed pump 12 driven by a camshaft 13 of the injection pump is filled into a plunger barrel 15 through a fuel filter 14, and is then sent through an injection nozzle 19 by a reciprocating plunger 16. He is sent to an institution, but
Surplus fuel other than the fuel sent from the plunger 16 is transferred to the fuel tank 11 by the fuel overflow valve 18.
be returned to.
この第４図図示の経路の構成は、近年のディーゼル機関
で多用されているが、プランジャ１６の圧送行程の終了
時に発生する高温、高圧のスピル燃料を燃料タンク１１
へ戻し、プランジャバレル１５内に流れ込む燃料は常に
新鮮な常温に近いものにすることにより、ポンプ内の温
度上昇を極力押えることができ、そのことにより噴射量
のバラツキを小さくすると共に、ポンプ自身の耐久性の
向上にも寄与させる狙いがある。The configuration of the path shown in FIG. 4 has been widely used in recent diesel engines, but the high temperature and high pressure spill fuel generated at the end of the pumping stroke of the plunger 16 is transferred to the fuel tank 1.
By keeping the fuel that flows back into the plunger barrel 15 fresh and close to room temperature, it is possible to suppress the temperature rise inside the pump as much as possible, thereby reducing variations in the injection amount and reducing the temperature of the pump itself. The aim is to contribute to improving durability.
しかしながら、上記経路による燃料供給方式においては
、燃料フィードポンプ１２より供給される燃料が少なく
なる低速域では、燃料タンク１１へ戻る経路が働いてし
まうと燃料充填効率が不安定になり、始動性の悪化及び
噴射量のバラツキを生じるので、必然的にオーバーフロ
ーバルブ１８の開弁圧は低速では高く、且つ高速では前
述のポンプ温度上昇防止の為、オーバーフロー量は多く
とる必要性があった。However, in the fuel supply system using the above route, in the low speed range where the fuel supplied from the fuel feed pump 12 decreases, if the route returning to the fuel tank 11 is activated, the fuel filling efficiency becomes unstable and startability becomes unstable. Since deterioration and variation in the injection amount occur, the opening pressure of the overflow valve 18 is necessarily high at low speeds, and at the same time, it is necessary to increase the overflow amount at high speeds in order to prevent the above-mentioned pump temperature rise.
ところで、従来の燃料オーバーフローバルブの構成は第
５図にその縦断面図を示す通りで、１はオーバーフロー
バルブ本体、１ａは燃料吐出孔、３は鋼球、５はスプリ
ングである。Incidentally, the configuration of a conventional fuel overflow valve is as shown in a vertical cross-sectional view in FIG. 5, where 1 is the overflow valve body, 1a is a fuel discharge hole, 3 is a steel ball, and 5 is a spring.
上述のような従来のオーバーフローバルブの構造では、
フィードポンプ１２の燃料供給量の少ない低速で、オー
バーフローバルブの開弁圧に達する迄に比較的長い時間
を要し、ひと度量弁するとオーバーフロー量を多くとる
様にしているため、第６図に示すような圧力挙動を呈す
るため、ポンプ内油溜室圧力Ｐｆは急減し、プランジャ
バレル１５に流れ込むに必要な燃料が不足してしまい、
噴射量にバラツキを生じ、機関及び車両をスムーズに運
転させるに弊害をきたすという問題点があった。In the conventional overflow valve structure as described above,
At low speeds when the amount of fuel supplied by the feed pump 12 is low, it takes a relatively long time to reach the opening pressure of the overflow valve, and once the valve is turned on, a large amount of overflow is obtained. Due to this pressure behavior, the pressure Pf in the oil reservoir chamber in the pump suddenly decreases, and the fuel necessary to flow into the plunger barrel 15 becomes insufficient.
There is a problem in that the amount of injection varies, which is detrimental to the smooth operation of the engine and vehicle.
本発明は、小さい絞り孔を持ち、且つ比較的低い燃料圧
力で開弁出来る第１調圧弁と、この第１調圧弁の開弁圧
より高い燃料圧力で開弁出来る第２調圧弁とをオーバー
フローバルブ本体内に兼ね備えるようにしたものである
。The present invention has a first pressure regulating valve that has a small throttle hole and can be opened at a relatively low fuel pressure, and a second pressure regulating valve that can open at a fuel pressure higher than the opening pressure of the first pressure regulating valve. It is designed to be installed inside the valve body.
小さい絞り径の孔を持ち、開弁圧の低い第１調圧弁によ
り車両の低速域では燃料フィードポンプの燃料供給量が
少なくなり、前記第１調圧弁の開弁圧より高い開弁圧を
有する第２調圧弁により車両の高速域では燃料フィード
ポンプの燃料供給量が多くなり必要噴射量以外の燃料を
出来るだけ多く燃料タンクへ戻すことが出来、ポンプ内
温度の上昇を極力押えることが出来る。The first pressure regulating valve having a hole with a small throttle diameter and having a low opening pressure reduces the amount of fuel supplied by the fuel feed pump in the low speed range of the vehicle, and has an opening pressure higher than the opening pressure of the first pressure regulating valve. The second pressure regulating valve increases the amount of fuel supplied by the fuel feed pump in the high speed range of the vehicle, allowing as much fuel as possible other than the required injection amount to be returned to the fuel tank, thereby suppressing the rise in temperature inside the pump as much as possible.
以下、本発明を図に示す実施例について説明する。 DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention shown in the drawings will be described.
第１図は、本発明になる燃料オーバーフローバルブの一
実施例の構成を示す縦断面図で、燃料オーバーフローバ
ルブの本体１の内部に、燃料フィードポンプよりの燃料
供給量の少ない低速域のみ作動する第１調圧弁２を有し
、この調圧弁２は鋼球３とスプリング４により構成され
、前記プランジャバレル１５内の燃料充填効率を損なわ
ぬ程度に出来るだけ低い開弁圧で、かつ、燃料流出量も
適度に押えるべく小さい絞り径の孔２ａを燃料が通るよ
うになっている。そして、燃料フィードポンプよりの燃
料供給量の多くなる高速域では、前記の燃料充填効率は
問題なくなるため、必要噴射量以外の燃料を出来るだけ
多く排出し、ポンプ内温度の上昇を極力押えるべく、第
１調圧弁２全体が、第１調圧弁２全体を押えつけている
スプリング５に打ち勝ち、シート部６より離れ開弁する
ように第２ｉ調圧弁７が構成されている。そして、この
第２調圧弁７の開弁圧は、前記第１調圧弁２の開弁圧よ
り高く、また、燃料流出量も多くなるよう開口面積は、
第１調圧弁２の開口面積より大きくしである。なお、２
ｂは第１吐出孔、１ａは第２吐出孔である。FIG. 1 is a longitudinal cross-sectional view showing the configuration of an embodiment of the fuel overflow valve according to the present invention, in which the fuel overflow valve operates only in a low speed range where the amount of fuel supplied from the fuel feed pump is small. The pressure regulating valve 2 has a first pressure regulating valve 2, which is composed of a steel ball 3 and a spring 4, and has an opening pressure as low as possible without impairing the fuel filling efficiency in the plunger barrel 15, and the fuel flows out. In order to suppress the amount of fuel to an appropriate level, the fuel passes through the hole 2a with a small aperture diameter. In the high-speed range where the amount of fuel supplied from the fuel feed pump increases, the fuel filling efficiency described above is not a problem, so in order to discharge as much fuel as possible other than the required injection amount and suppress the rise in temperature inside the pump as much as possible, The second i-th pressure regulating valve 7 is configured such that the entire first pressure regulating valve 2 overcomes the spring 5 holding down the entire first pressure regulating valve 2 and opens away from the seat portion 6. The opening pressure of the second pressure regulating valve 7 is higher than the opening pressure of the first pressure regulating valve 2, and the opening area is set so that the amount of fuel flowing out is also large.
It is larger than the opening area of the first pressure regulating valve 2. In addition, 2
b is a first discharge hole, and 1a is a second discharge hole.
なお、本発明になる燃料オーバーフローバルブの他の実
施例として、第２図に示す如く第１調圧弁２は、弁部形
状を鋼球だけでなく、板状にしても良い。In addition, as another embodiment of the fuel overflow valve according to the present invention, as shown in FIG. 2, the first pressure regulating valve 2 may have a valve portion shape not only of a steel ball but also of a plate shape.
また、第３図に示す如く、第１調圧弁２と第２調圧弁７
とを直列に構成することも可能である。Moreover, as shown in FIG. 3, the first pressure regulating valve 2 and the second pressure regulating valve 7
It is also possible to configure them in series.
上記構成になる燃料オーバーフローバルブにおいては、
前述のような第１調圧弁及び第２調圧弁をオーバーフロ
ーバルブ本体内に兼ね備えることにより、車両の低速域
では燃料供給量が少なくなり、高速域では燃料供給量が
多くなり必要噴射量以外の燃料を出来るだけ多く燃料タ
ンクへ戻しポンプ内温度の上昇を極力押えることができ
、低速から高速までポンプ内油溜室圧力Ｐｆを安定化さ
せることができ、噴射量のバラツキを防止し、機関及び
車両をスムーズに運転させることができる等の効果が大
である。In the fuel overflow valve with the above configuration,
By combining the first pressure regulating valve and the second pressure regulating valve as described above in the overflow valve body, the amount of fuel supplied is small in the low speed range of the vehicle, and the amount of fuel supplied is large in the high speed range, so that fuel other than the required injection amount is It is possible to return as much of the fuel as possible to the fuel tank, suppress the rise in temperature inside the pump as much as possible, stabilize the pump internal oil reservoir pressure Pf from low speed to high speed, prevent variation in injection amount, and improve engine and vehicle It has great effects such as being able to run smoothly.
第１図は本発明になる燃料オーバーフローバルブの一実
施例の全体構成を示す縦断面図、第２図及び第３図は本
発明になる燃料オーバーフローバルブの他の実施例の構
成を示す縦断面図、第４図は従来使用されている噴射ポ
ンプの燃料供給方式の系統図、第５図は従来の燃料オー
バーフローバルブの全体構成を示す縦断面図、第６図は
第５図図示の従来の燃料オーバーフローバルブを使用し
た場合の欠点を示す噴射ポンプ内の油溜室圧力Ｐｆの圧
力挙動特性図である。
１・・・燃料オーバーフローバルブの本体、２・・・第
１調圧弁、２ａ・・・小さい絞り径の孔、２ｂ・・・第
１吐出孔、ｌａ・・・第２吐出孔、３・・・鋼球、４・
・・第１調圧弁用スプリング、５・・・第２調圧弁用ス
プリング、６・・・シート部、７・・・第２調圧弁、１
１・・・燃料タンク、１２・・・燃料フィードポンプ、
１３・・・カム軸、１５・・・プランジャバレル、１６
・・・プランジャ。
１８・・・燃料オーバーフローバルブ、１９・・・噴射
ノズル。
代理人弁理士 岡 部 隆
第１図
第２図 第３図
２、奪升り〉７
第４図
第６図FIG. 1 is a vertical cross-sectional view showing the overall structure of one embodiment of the fuel overflow valve according to the present invention, and FIGS. 2 and 3 are longitudinal cross-sectional views showing the structure of other embodiments of the fuel overflow valve according to the present invention. Fig. 4 is a system diagram of a fuel supply system of a conventionally used injection pump, Fig. 5 is a vertical sectional view showing the overall structure of a conventional fuel overflow valve, and Fig. 6 is a system diagram of a conventional fuel supply system shown in Fig. 5. FIG. 3 is a pressure behavior characteristic diagram of the oil reservoir pressure Pf in the injection pump, showing a drawback when using a fuel overflow valve. DESCRIPTION OF SYMBOLS 1... Body of fuel overflow valve, 2... First pressure regulating valve, 2a... Hole with small throttle diameter, 2b... First discharge hole, la... Second discharge hole, 3...・Steel ball, 4・
... Spring for first pressure regulating valve, 5... Spring for second pressure regulating valve, 6... Seat part, 7... Second pressure regulating valve, 1
1...Fuel tank, 12...Fuel feed pump,
13...Camshaft, 15...Plunger barrel, 16
...Plunger. 18...Fuel overflow valve, 19...Injection nozzle. Representative Patent Attorney Takashi Okabe Fig. 1 Fig. 2 Fig. 3 2, Seizure〉7 Fig. 4 Fig. 6
Claims (2)
料流出量を適度に押えた小さな絞り径の孔を持ち、且つ
比較的低い燃料圧力で開弁出来る第１調圧弁と、燃料フ
ィードポンプの供給量の多い高速域では必要噴射量以外
の燃料を出来るだけ多く燃料タンクへ戻すことの出来る
よう前記第１調圧弁の開弁圧より高い燃料圧力で開弁出
来る第２調圧弁とをオーバーフローバルブ本体内に兼ね
備えたことを特徴とする燃料オーバーフローバルブ。(1) A first pressure regulating valve that has a hole with a small diameter that moderately suppresses the amount of fuel flowing out in the low speed range where the fuel feed pump supply amount is small, and that can be opened at a relatively low fuel pressure; In high-speed ranges where there is a large supply amount, a second pressure regulating valve that can open at a fuel pressure higher than the opening pressure of the first pressure regulating valve is used as an overflow valve so that as much fuel as possible other than the required injection amount can be returned to the fuel tank as much as possible. A fuel overflow valve that is characterized by being equipped inside the main body.
徴とする特許請求の範囲第１項に記載の燃料噴射ポンプ
。(2) The fuel injection pump according to claim 1, further comprising the fuel overflow valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27309585A JPS62131970A (en) | 1985-12-04 | 1985-12-04 | Fuel overflow valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27309585A JPS62131970A (en) | 1985-12-04 | 1985-12-04 | Fuel overflow valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62131970A true JPS62131970A (en) | 1987-06-15 |
Family
ID=17523069
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27309585A Pending JPS62131970A (en) | 1985-12-04 | 1985-12-04 | Fuel overflow valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62131970A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100625891B1 (en) * | 1998-01-27 | 2006-09-20 | 에스.이.엠.티. 피엘스틱 | A device for avoiding cavitation in injection pumps |
| CN103899460A (en) * | 2014-03-28 | 2014-07-02 | 哈尔滨工程大学 | Double buffering type overflow valve |
| JP2016079857A (en) * | 2014-10-15 | 2016-05-16 | 株式会社デンソー | Overflow valve device |
-
1985
- 1985-12-04 JP JP27309585A patent/JPS62131970A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100625891B1 (en) * | 1998-01-27 | 2006-09-20 | 에스.이.엠.티. 피엘스틱 | A device for avoiding cavitation in injection pumps |
| CN103899460A (en) * | 2014-03-28 | 2014-07-02 | 哈尔滨工程大学 | Double buffering type overflow valve |
| JP2016079857A (en) * | 2014-10-15 | 2016-05-16 | 株式会社デンソー | Overflow valve device |
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