JPS626291Y2 - - Google Patents
Info
- Publication number
- JPS626291Y2 JPS626291Y2 JP4244783U JP4244783U JPS626291Y2 JP S626291 Y2 JPS626291 Y2 JP S626291Y2 JP 4244783 U JP4244783 U JP 4244783U JP 4244783 U JP4244783 U JP 4244783U JP S626291 Y2 JPS626291 Y2 JP S626291Y2
- Authority
- JP
- Japan
- Prior art keywords
- valve
- spring
- fuel
- valve body
- pump
- 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
Links
- 238000002347 injection Methods 0.000 claims description 49
- 239000007924 injection Substances 0.000 claims description 49
- 239000000446 fuel Substances 0.000 claims description 47
- 230000006870 function Effects 0.000 claims description 24
- 229910001285 shape-memory alloy Inorganic materials 0.000 claims description 10
- 230000009466 transformation Effects 0.000 claims description 8
- 230000009471 action Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000000740 bleeding effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
Landscapes
- Fuel-Injection Apparatus (AREA)
Description
【考案の詳細な説明】
本考案はデイーゼルエンジンにおいて燃料噴射
ポンプ取付時にチエツク弁機能をもたせて噴射系
のエア抜きを容易にし、通常運転時にはチエツク
弁機能を解除するようにした燃料噴射ポンプのチ
エツク弁に関する。[Detailed description of the invention] The present invention is a fuel injection pump check valve that is equipped with a check valve function when installing the fuel injection pump in a diesel engine to facilitate air bleeding from the injection system, and which releases the check valve function during normal operation. Regarding valves.
近年デイーゼルエンジンでは燃料の噴霧をでき
るだけ微細化して良好な燃焼状態を得て燃費を向
上し排ガスの悪化を防止するため、燃料噴射ポン
プの噴射圧の高圧化が図られている。 In recent years, in diesel engines, the injection pressure of the fuel injection pump has been increased in order to make the fuel spray as fine as possible to obtain good combustion conditions, improve fuel efficiency, and prevent deterioration of exhaust gas.
ところで、従来の燃料噴射ポンプでは燃料の送
出口にチエツク弁機能を有する送出弁が設けら
れ、ポンプ側への燃料の逆流を防ぎ、又そのピス
トン部の吸戻し作用によつて噴射後の噴射管内圧
力を下げ噴射の切れを良くし、ノズルからの後だ
れを防止するようにしている。 By the way, in conventional fuel injection pumps, a delivery valve with a check valve function is provided at the fuel delivery port to prevent the backflow of fuel to the pump side, and also to prevent the fuel from flowing back into the injection pipe after injection due to the suction action of the piston. The pressure is lowered to improve the sharpness of the jet and prevent dripping from the nozzle.
しかしながら、かかる送出弁を設けた場合、主
として送出弁の弁室の容積がポンプの加圧室から
ノズルに至る間のデツドボリユームを増やすこと
となつてポンプの加圧が有効になされないとか、
ポンプの圧送開始時からノズルの開弁圧上昇開始
時までの間に時間的ずれが生じ噴射タイミングの
コントロールが適正に行われ難いとか、又噴射後
に、ノズルと送出弁との間に反射波が発生して２
次噴射を起したり、噴射管にキヤビテーシヨンエ
ロージヨンを発生させたりする等の不具合を来
す。 However, when such a delivery valve is provided, the volume of the valve chamber of the delivery valve increases the dead volume between the pressurizing chamber of the pump and the nozzle, and the pump cannot be pressurized effectively.
There is a time lag between when the pump starts pumping and when the opening pressure of the nozzle starts to rise, making it difficult to properly control the injection timing, and after injection, there may be reflected waves between the nozzle and the delivery valve. Occurred 2
This may cause problems such as subsequent injection or cavitation erosion in the injection pipe.
このため、送出弁のばねの押圧力を通常の運転
条件において生じる最低噴射ポンプ内圧より小さ
く設定し（特開昭57−183561号）、又送出弁の弁
室と噴射ポンプの分配通路室とを連通する連絡通
路を設け（実開昭57−178162号）、従来の送出弁
の機能を減退させ送出弁の弁室内に発生する気泡
を消滅させ、かつ弁室内の残圧の平準化を図つた
送出弁が提案されている。 For this reason, the pressing force of the spring of the delivery valve is set to be smaller than the lowest internal pressure of the injection pump that occurs under normal operating conditions (Japanese Patent Laid-Open No. 183561/1983), and the valve chamber of the delivery valve and the distribution passage chamber of the injection pump are A communicating passage was provided (Utility Model Application No. 57-178162) to reduce the function of the conventional delivery valve, eliminate air bubbles generated in the valve chamber of the delivery valve, and equalize the residual pressure in the valve chamber. A delivery valve has been proposed.
しかしながら、上記両送出弁共デツドボリユー
ムとなる弁室の容積が大きくなりがちであり、か
つ、燃料通路が送出弁により塞がれているため、
ポンプの加圧が有効になされず、噴射タイミング
のコントロールが適正に行われ難いとか、又反射
波が発生するという前記の問題は解決されない。 However, since both of the above delivery valves tend to have large volumes of valve chambers that become dead volumes, and the fuel passage is blocked by the delivery valve,
The problems described above, such as the fact that the pump is not pressurized effectively, that it is difficult to properly control the injection timing, and that reflected waves are generated, are not solved.
かかる観点からすれば、燃料噴射ポンプを高圧
化する場合、送出弁を設けない方が具合がよい。
しかし、送出弁を設けない燃料噴射ポンプでは、
エンジンにポンプを取付けて初めてエンジンを始
動させるに際し、送出弁によるチエツク弁として
の逆止め作用が得られないため、ポンプの圧送行
程で押出される燃料は細い噴射管に入つているエ
アのクツシヨン作用によりポンプの吸入行程でポ
ンプ側に逆流して先に送り出されず、何度かセル
モータを回してもエンジンが始動しないという問
題が生じる。 From this point of view, when increasing the pressure of the fuel injection pump, it is better not to provide a delivery valve.
However, with fuel injection pumps that do not have a delivery valve,
When starting the engine for the first time after attaching the pump to the engine, the delivery valve does not have a check valve action, so the fuel pushed out during the pump's pressure stroke is due to the cushioning action of the air in the thin injection pipe. This causes a problem in that during the suction stroke of the pump, the oil flows back to the pump side and is not sent out first, resulting in the engine not starting even if the starter motor is turned several times.
このため、従来においてはエンジンにポンプを
取り付けて初めてエンジンを始動させる時、すな
わち初期始動時には噴射管からノズルを外し、噴
射管の先端から燃料油が出るまでポンプを駆動し
て噴射管のエア抜きをし、その後ノズルを接続す
るという煩雑な手順を各シリンダにつき行つてい
る。 For this reason, in the past, when starting the engine for the first time after attaching a pump to the engine, that is, at initial startup, the nozzle was removed from the injection pipe, and the pump was driven until fuel oil came out from the tip of the injection pipe to bleed air from the injection pipe. The complicated procedure of connecting the nozzle after that is performed for each cylinder.
本考案は上記事情に鑑みてなされたものであ
り、燃料送出口を開閉可能な弁体と、該弁体を閉
弁方向に付勢する第１のばねと、前記弁体に取り
付けられると共に、形状記憶合金により形成され
ており、該形状記憶合金の所定の変態温度に達す
る前においては前記弁体に逆止め機能を付与する
一方、前記変態温度に達した後においては前記第
１のばねの付勢力に抗する付勢力の付与により前
記逆止め機能を解除させる第２のばねとを備えた
ことを特徴とし、エンジンの初期始動時には形状
記憶合金で成る第２のばねがチエツク弁に逆止め
機能を付与するように作用して噴射管のエアを排
除して燃料を送出し、噴射管のエアが排除されて
ノズルから燃料が噴射されてエンジンが始動すれ
ば第２のばねがチエツク弁に逆止め機能を解除す
るように作用して通常運転時には送出弁なしの燃
料噴射ポンプの利点が発揮されるようにした燃料
噴射ポンプのチエツク弁を提供することを目的と
する。 The present invention has been made in view of the above circumstances, and includes a valve body that can open and close a fuel delivery port, a first spring that biases the valve body in the valve closing direction, and a first spring attached to the valve body, The valve element is made of a shape memory alloy, and the valve element has a non-return function before reaching a predetermined transformation temperature of the shape memory alloy, while the first spring functions after reaching the transformation temperature. and a second spring that releases the non-return function by applying a biasing force that resists the biasing force, and the second spring made of a shape memory alloy applies a non-return function to the check valve when the engine is initially started. When the air in the injection pipe is removed and fuel is injected from the nozzle and the engine starts, the second spring acts as a check valve. It is an object of the present invention to provide a check valve for a fuel injection pump which acts to release the non-return function so that the advantages of a fuel injection pump without a delivery valve are exhibited during normal operation.
以下本考案の実施例を図面に基づいて説明す
る。第１図に示すように、公知の燃料噴射ポンプ
１の燃料送出口２には本考案によるチエツク弁１
０が取付けられ、燃料噴射ポンプ１で加圧された
燃料は該チエツク弁１０に接続された噴射管３を
通じて噴射ノズル４からエンジンのシリンダ内へ
噴射される。チエツク弁１０は前記燃料送出口２
に同軸的に螺着され、先端に噴射管３との接続口
１１ａが形成され内部に弁室１１ｂ及び燃料通路
１１ｃが穿設された弁ホルダ部１１、該弁ホルダ
部１１の弁室１１ｂに嵌合され前記燃料送出口２
と弁室１１ｂとを連通する弁孔１２ａを有する弁
座部１２、弁室１１ｂに収容され、燃料噴射ポン
プ１よりの燃料の送出方向へ移動して弁孔１２ａ
を開く弁体１３より成る。 Embodiments of the present invention will be described below based on the drawings. As shown in FIG. 1, a check valve 1 according to the present invention is installed at a fuel delivery port 2 of a known fuel injection pump 1.
0 is attached, and fuel pressurized by a fuel injection pump 1 is injected into the cylinder of the engine from an injection nozzle 4 through an injection pipe 3 connected to the check valve 10. The check valve 10 is connected to the fuel delivery port 2.
A valve holder part 11 is screwed coaxially to the valve holder part 11, which has a connection port 11a with the injection pipe 3 formed at its tip and a valve chamber 11b and a fuel passage 11c bored therein; The fitted fuel outlet port 2
A valve seat portion 12 having a valve hole 12a that communicates with the valve chamber 11b is accommodated in the valve chamber 11b, and moves in the direction of fuel delivery from the fuel injection pump 1 to open the valve hole 12a.
It consists of a valve body 13 that opens.
弁体１３は第２図に示すように開弁時に燃料を
弁孔１２ａから弁室１１ｂ側へ通す切欠き１３ａ
を外周部に設けており全体として星形に形成され
ている。この弁体１３を収容する弁室１１ｂ内に
は、この弁体１３を閉弁方向に付勢し該チエツク
弁１０に逆止め機能を付与する第１のばねが設け
られ、弁座部１２の弁孔１２ａ内には、弁体１３
を開弁方向に付勢し該チエツク弁１０の逆止め機
能を解除する第２のばね１５が設けられている。
第１のばね１４を通常のばね材料によるコイルば
ねとし、第２のばねを公知の形状記憶合金による
感温コイルばねとする。 As shown in FIG. 2, the valve body 13 has a notch 13a that allows fuel to pass from the valve hole 12a to the valve chamber 11b side when the valve is opened.
is provided on the outer periphery, and the overall shape is star-shaped. A first spring is provided in the valve chamber 11b that accommodates the valve body 13, which biases the valve body 13 in the valve closing direction and provides a non-return function to the check valve 10. A valve body 13 is located inside the valve hole 12a.
A second spring 15 is provided which biases the check valve 10 in the valve opening direction and releases the non-return function of the check valve 10.
The first spring 14 is a coil spring made of a normal spring material, and the second spring is a temperature-sensitive coil spring made of a known shape memory alloy.
この構成において、噴射管３のエア抜きを行う
エンジンの初期始動時にあつては、燃料がまだ常
温に近く第２のばね１５の変態温度より温度が低
いときには、第２のばね１５はばねとして作用せ
ず、弁体１３は第１のばね１４の付勢力のみによ
り弁座部１２に押圧されチエツク弁１０に逆止め
機能が付与される。従つ燃料噴射ポンプ１の加圧
行程でチエツク弁１０の弁体１３を第１のばね１
４の付勢力に抗して押上げて噴射管３に押出され
た燃料の逆流が阻止され、燃料は噴射管３内の空
気を次第に追出しつつ噴射ノズル４に達してエン
ジンのシリンダ内に噴射される。 In this configuration, when the fuel is still at room temperature and the temperature is lower than the transformation temperature of the second spring 15 during the initial startup of the engine to bleed air from the injection pipe 3, the second spring 15 acts as a spring. Instead, the valve body 13 is pressed against the valve seat portion 12 only by the biasing force of the first spring 14, and the check valve 10 is provided with a non-return function. Accordingly, during the pressurizing stroke of the fuel injection pump 1, the valve body 13 of the check valve 10 is moved by the first spring 1.
The reverse flow of the fuel pushed up against the urging force of the injection pipe 3 is prevented, and the fuel reaches the injection nozzle 4 and is injected into the cylinder of the engine while gradually expelling the air inside the injection pipe 3. Ru.
かくして、エンジンは始動され、燃料噴射ポン
プ１の燃料温度が上昇して第２のばね１５の形状
記憶合金の変態温度に達すると第２のばね１５は
第１のばね１４の付勢力に抗する付勢力が付与さ
れてばねとして作用し、第１のばね１４を圧縮し
恒常的に弁体１３を開弁方向に付勢し該チエツク
弁１０の逆止め機能を解除する。従つて以後燃料
噴射ポンプ１はチエツク弁機能のないものと同様
の作用を行う。 Thus, the engine is started, and when the fuel temperature of the fuel injection pump 1 rises and reaches the transformation temperature of the shape memory alloy of the second spring 15, the second spring 15 resists the biasing force of the first spring 14. The biasing force is applied and acts as a spring, compressing the first spring 14, permanently biasing the valve body 13 in the valve opening direction, and canceling the non-return function of the check valve 10. Therefore, from now on, the fuel injection pump 1 performs the same function as one without the check valve function.
以上述べたように本考案では、燃料送出口を開
閉可能な弁体と、該弁体を閉弁方向に付勢する第
１のばねと、前記弁体に取り付けられると共に、
形状記憶合金により形成されており、該形状記憶
合金の所定の変態温度に達する前においては前記
弁体に逆止め機能を付与する一方、前記変態温度
に達した後においては前記第１のばねの付勢力に
抗する付勢力の付与により前記逆止め機能を解除
させる第２のばねとを備えたことを特徴とするの
で、噴射管のエア抜きを行うエンジンの初期始動
時においては、まだ常温付近にある燃料温度や外
部の温度入力に対応して形状記憶合金から成る第
２のばねがチエツク弁に逆止め機能を付与するよ
うに作用することとなり、従つて、噴射管先端よ
り噴射ノズルを取外すという煩雑な手順を要する
ことなく、燃料噴射ポンプより送出される燃料に
より噴射管内のエアは必然的に排除されることと
なり、以後ノズルから燃料を噴射させてエンジン
の始動を可能にする。 As described above, the present invention includes a valve body that can open and close the fuel delivery port, a first spring that biases the valve body in the valve closing direction, and a first spring that is attached to the valve body, and
The valve element is made of a shape memory alloy, and the valve element has a non-return function before reaching a predetermined transformation temperature of the shape memory alloy, while the first spring functions after reaching the transformation temperature. The second spring releases the non-return function by applying a biasing force that resists the biasing force, so that when the engine is initially started to bleed air from the injection pipe, the temperature is still around room temperature. In response to the fuel temperature and external temperature input, the second spring made of a shape memory alloy acts to provide a non-return function to the check valve, and the injection nozzle is removed from the tip of the injection pipe. Without this complicated procedure, the air in the injection pipe is inevitably removed by the fuel delivered from the fuel injection pump, and the fuel is then injected from the nozzle to start the engine.
エンジンの始動後は上昇した燃料温度や外部の
温度入力に対応して形状記憶合金による第２のば
ねがチエツク弁の逆止め機能を解除するように作
用し、燃料噴射ポンプは送出弁を設けないものと
同様になる。すなわち、本チエツク弁は従来の送
出弁に比べエンジンの初期始動時にチエツク弁機
能を付与するだけのものであるから最小のデツド
ボリユームで組み立てられ、従つて通常運転に際
してはポンプの加圧が有効になされ、かつ噴射タ
イミングのコントロールが適正に行われ、又噴射
ノズルと送出弁との間に反射波がないという送出
弁を設けない燃料噴射ポンプの利点を発揮するこ
とができる。 After the engine starts, a second spring made of a shape memory alloy acts to release the non-return function of the check valve in response to increased fuel temperature or external temperature input, and the fuel injection pump does not have a delivery valve. It becomes similar to things. In other words, compared to conventional delivery valves, this check valve only provides a check valve function at the initial startup of the engine, so it can be assembled with the minimum dead volume, and therefore the pump can be pressurized effectively during normal operation. In addition, the injection timing can be properly controlled, and the advantage of a fuel injection pump without a delivery valve, that is, there is no reflected wave between the injection nozzle and the delivery valve, can be exhibited.
図面は本考案の実施例を示し、第１図は燃料噴
射ポンプに螺着された本チエツク弁の断面図、第
２図は第１図における−線矢視断面図であ
る。
１……燃料噴射ポンプ、２……燃料送出口、１
０……チエツク弁、１３……弁体、１４……第１
のばね、１５……第２のばね。
The drawings show an embodiment of the present invention, and FIG. 1 is a cross-sectional view of the present check valve screwed onto a fuel injection pump, and FIG. 2 is a cross-sectional view taken along the - line in FIG. 1. 1...Fuel injection pump, 2...Fuel delivery port, 1
0...Check valve, 13...Valve body, 14...First
Spring, 15...second spring.
Claims (1)
方向に付勢する第１のばねと、前記弁体に取り付
けられると共に、形状記憶合金により形成されて
おり、該形状記憶合金の所定の変態温度に達する
前においては前記弁体に逆止め機能を付与する一
方、前記変態温度に達した後においては前記第１
のばねの付勢力に抗する付勢力の付与により前記
逆止め機能を解除させる第２のばねとを備えたこ
とを特徴とする燃料噴射ポンプのチエツク弁。 a valve body that can open and close the fuel delivery port; a first spring that biases the valve body in the valve closing direction; and a first spring that is attached to the valve body and is made of a shape memory alloy; Before reaching a predetermined transformation temperature, the valve body is provided with a non-return function, and after reaching the transformation temperature, the first valve body is provided with a check function.
A check valve for a fuel injection pump, comprising: a second spring that releases the check function by applying a biasing force that resists the biasing force of the spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4244783U JPS59148469U (en) | 1983-03-24 | 1983-03-24 | Fuel injection pump check valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4244783U JPS59148469U (en) | 1983-03-24 | 1983-03-24 | Fuel injection pump check valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59148469U JPS59148469U (en) | 1984-10-04 |
| JPS626291Y2 true JPS626291Y2 (en) | 1987-02-13 |
Family
ID=30172989
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4244783U Granted JPS59148469U (en) | 1983-03-24 | 1983-03-24 | Fuel injection pump check valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59148469U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11237062B2 (en) * | 2018-03-30 | 2022-02-01 | Shibaura Electronics Co., Ltd. | Temperature detection device and assembly thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008215148A (en) * | 2007-03-01 | 2008-09-18 | Yanmar Co Ltd | Supply pump |
-
1983
- 1983-03-24 JP JP4244783U patent/JPS59148469U/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11237062B2 (en) * | 2018-03-30 | 2022-02-01 | Shibaura Electronics Co., Ltd. | Temperature detection device and assembly thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59148469U (en) | 1984-10-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU708362B2 (en) | Cylinder injection high-pressure fuel pump | |
| US3978839A (en) | Primer system for internal combustion engine | |
| US5423484A (en) | Injection rate shaping control ported barrel for a fuel injection system | |
| JPH02233814A (en) | Engine brake for service cars | |
| JPS626291Y2 (en) | ||
| JP5000834B2 (en) | Common rail gasoline fuel injection system for vehicle engines | |
| US5775305A (en) | Fuel pump injector for compression ignition engines | |
| JP2795137B2 (en) | Fuel supply device for internal combustion engine | |
| JP2848206B2 (en) | Fuel supply device for internal combustion engine | |
| JP3235286B2 (en) | Fuel injection device for internal combustion engine | |
| JP2845099B2 (en) | Fuel supply device for internal combustion engine | |
| JPS6146459A (en) | Fuel jet pump of internal combustion engine | |
| JP2938949B2 (en) | Engine fuel injection device | |
| JP2842053B2 (en) | Diaphragm pump | |
| JPS643813Y2 (en) | ||
| JPH0665871B2 (en) | Fuel injection device for internal combustion engine | |
| JP2795138B2 (en) | Fuel supply device for internal combustion engine | |
| JPH0643489Y2 (en) | Fuel injection device for internal combustion engine | |
| JP3508555B2 (en) | Fuel pump | |
| JP3708702B2 (en) | High pressure fuel pump feed pressure pulsation reduction device | |
| JP3221033B2 (en) | Constant residual pressure valve for fuel injection pump | |
| JPH08144892A (en) | Discharge valve of fuel injection pump | |
| JPS58197468A (en) | Fuel injection device | |
| JP2610367B2 (en) | Various fuel injection devices | |
| JPS6013973A (en) | Device for driving load by combustion pressure of internal-combustion engine |