JPH09151802A - Gas fuel injection valve - Google Patents
Gas fuel injection valveInfo
- Publication number
- JPH09151802A JPH09151802A JP7314974A JP31497495A JPH09151802A JP H09151802 A JPH09151802 A JP H09151802A JP 7314974 A JP7314974 A JP 7314974A JP 31497495 A JP31497495 A JP 31497495A JP H09151802 A JPH09151802 A JP H09151802A
- Authority
- JP
- Japan
- Prior art keywords
- spindle
- spring
- gas
- valve
- fuel
- 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.)
- Withdrawn
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
Landscapes
- Fuel-Injection Apparatus (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ガス燃料ディーゼ
ルエンジンに用いられるガス燃料噴射弁に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas fuel injection valve used in a gas fuel diesel engine.
【０００２】[0002]
【従来の技術】従来、一般に、ガス燃料ディーゼルエン
ジンに用いられるガス燃料噴射弁は、閉弁時、弁シート
部において高圧ガス燃料をシールする必要があることか
ら、非常に大きなシート部面圧を要求されることにな
る。そのため、シート部押付け力、即ち、ばね力を大き
くしなければならず、必然的にばねも大寸法のものとな
り、噴射弁全体のコンパクト化を制限する要因になって
いる。また、ばね折損時には、シート部押付け力が減少
し、ガス燃料がシリンダ内へ異常流出する危険性を有し
ている。2. Description of the Related Art Conventionally, in a gas fuel injection valve used in a gas fuel diesel engine, it is generally necessary to seal high pressure gas fuel in a valve seat portion when the valve is closed. Will be required. Therefore, it is necessary to increase the seat portion pressing force, that is, the spring force, and the spring inevitably has a large size, which is a factor limiting the compactness of the entire injection valve. Further, when the spring is broken, the seat portion pressing force decreases, and there is a risk that the gas fuel may abnormally flow into the cylinder.
【０００３】[0003]
【発明が解決しようとする課題】本発明は、係る従来の
欠点を解消するためになされたものであり、その目的と
するところは、ばねの小寸法化、及び、ばねの小寸法化
による噴射弁全体としての小型化が可能となり、コスト
低減できると同時に、噴射弁装着対象物の設計に自由度
を持たせることができ、さらには、ガス燃料自体の圧力
をシート部押付け力に利用することにより、ばね折損時
においても安全にシート部押付け力を維持できるガス燃
料噴射弁を提供することにある。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional drawbacks, and its object is to reduce the size of the spring and the injection by reducing the size of the spring. The valve as a whole can be miniaturized, the cost can be reduced, and at the same time, the flexibility of the design of the object to which the injection valve is attached can be given. Furthermore, the pressure of the gas fuel itself can be used for the pressing force of the seat. Accordingly, it is an object of the present invention to provide a gas fuel injection valve capable of safely maintaining the seat portion pressing force even when the spring is broken.
【０００４】[0004]
【課題を解決するための手段】即ち、本発明のガス燃料
噴射弁は、高圧燃料ガスが充填される燃料ガス溜を貫通
して延在するスピンドルを有するガス燃料噴射弁におい
て、前記スピンドルの背後からスピンドルの中を通して
弁シート部まで高圧燃料ガスを導くようにしたことを特
徴とするものである。That is, a gas fuel injection valve of the present invention is a gas fuel injection valve having a spindle extending through a fuel gas reservoir filled with high-pressure fuel gas, wherein the gas fuel injection valve is behind the spindle. It is characterized in that the high-pressure fuel gas is guided to the valve seat portion through the inside of the spindle.
【０００５】[0005]
【発明の実施の形態】以下、図面により本発明の実施の
形態について説明する。図２は、本発明に係るガス燃料
噴射弁の縦断面図であり、弁本体１内には、スピンドル
２が摺動自在に嵌合されている。スピンドル２の先端部
には、図１に示すように、第１、第２テーパー面４，５
が形成され、第１テーパー面４の弁作用により燃料ガス
溜６と噴射ノズル部７との間を開閉するようになってい
る。Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a vertical sectional view of a gas fuel injection valve according to the present invention, in which a spindle 2 is slidably fitted in a valve body 1. As shown in FIG. 1, the tip of the spindle 2 has first and second tapered surfaces 4, 5
Is formed, and the valve action of the first tapered surface 4 opens and closes between the fuel gas reservoir 6 and the injection nozzle portion 7.
【０００６】また、図２に示すように、燃料ガス溜６に
は、２スピンドル２の軸芯部に設けた燃料ガス通路８ａ
を通して、常時、高圧（例えば、２５０〜２８０ｋｇ／
ｃｍ2 ）の燃料ガスａが供給され充填される。スピンド
ル２には、燃料ガス溜６と燃料ガス通路８ａとを連通さ
せる複数の分岐孔９が設けられている。また、噴射ノズ
ル部７には、燃焼室１２の所定方向に向けて開口された
複数個の噴射孔１３が形成され、開弁時、即ち、スピン
ドル２が上昇し、第１テーパー面４が上昇した時、燃料
ガス溜６内の高圧燃料ガスａを燃焼室１２内へ噴射する
ようになっている。Further, as shown in FIG. 2, the fuel gas reservoir 6 has a fuel gas passage 8a provided at the shaft center of the two spindles 2.
Through high pressure (for example, 250 to 280 kg /
The fuel gas a of cm 2 ) is supplied and filled. The spindle 2 is provided with a plurality of branch holes 9 that allow the fuel gas reservoir 6 and the fuel gas passage 8a to communicate with each other. In addition, a plurality of injection holes 13 opened in a predetermined direction of the combustion chamber 12 are formed in the injection nozzle portion 7, and when the valve is opened, that is, the spindle 2 is raised and the first tapered surface 4 is raised. At this time, the high pressure fuel gas a in the fuel gas reservoir 6 is injected into the combustion chamber 12.
【０００７】更に、スピンドル２のフランジ１４とばね
室１５内に固着させた支持部材１６との間に配設させた
圧縮ばね１７によってスピンドル２を下向に付勢し、第
１テーパー面４を図示の閉位置に維持するようになって
いる。また、図２に示すように、スピンドル２の大径部
２２の下側には、コントロール油圧室２３が形成され、
このコントロール油圧室２３に通路２４からコントロー
ル油ｂを導入することにより、圧縮ばね１７のばね力に
抗してスピンドル２を上向きに付勢して開弁するように
なっている。Further, the compression spring 17 disposed between the flange 14 of the spindle 2 and the support member 16 fixed in the spring chamber 15 urges the spindle 2 downward so that the first taper surface 4 is moved. It is designed to be maintained in the closed position shown. Further, as shown in FIG. 2, a control hydraulic chamber 23 is formed below the large diameter portion 22 of the spindle 2.
By introducing the control oil b into the control hydraulic chamber 23 from the passage 24, the spindle 2 is biased upward against the spring force of the compression spring 17 to open the valve.
【０００８】また、コントロール油圧室２３を挟んでそ
の上下に設けたシール室２５，２６に通路２７，２８か
らシール油ｃを導入することにより、ばね室１５等と、
スピンドル２の動きを制御するコントロール油系との間
で燃料ガスをシールしている。しかして、ディーゼルエ
ンジンへの燃料ガス噴射量は、前記コントロール油圧室
２３内への圧力付加の期間を制御してスピンドル２の開
弁期間を制御することにより調整され、エンジンの運転
制御が行われる。Further, by introducing the seal oil c from the passages 27 and 28 into the seal chambers 25 and 26 provided above and below the control hydraulic chamber 23, the spring chamber 15 and the like are provided.
Fuel gas is sealed with a control oil system that controls the movement of the spindle 2. Then, the fuel gas injection amount to the diesel engine is adjusted by controlling the period of pressure application to the control hydraulic chamber 23 to control the valve opening period of the spindle 2 to control the operation of the engine. .
【０００９】一方、本発明のガス燃料噴射弁は、図１に
示すように、スピンドル２の背後からスピンドル２の中
を通って弁シート部３０まで圧力Ｐｇの燃料ガスａを導
くことによってスピンドル２の周囲圧力と作用面積との
関係からスピンドル２に、圧縮ばね１７のばね力Ｆ0 と
同様に作用するシート押付け力Ｆｇを得ようとするもの
である。On the other hand, in the gas fuel injection valve of the present invention, as shown in FIG. 1, the fuel gas a having a pressure Pg is introduced from behind the spindle 2 through the spindle 2 to the valve seat portion 30. The sheet pressing force Fg acting on the spindle 2 in the same manner as the spring force F 0 of the compression spring 17 is intended to be obtained from the relationship between the ambient pressure and the acting area.
【００１０】ここで、スピンドル２の大径部２２の径を
ｄ1 、スピンドル２の中径部２９の径をｄ2 、スピンド
ル２の小径部３１の径をｄ3 とすると、燃料ガスに起因
するシート押付け力Ｆｇは、次式で表せる。即ち、 そして、本来、必要な弁シート部押付け力をＦとする
と、必要なばね力Ｆ0 は、次式のように軽減されること
になる。即ち、 Ｆ0 ＝Ｆ−Ｆｇ また、ＦｇをＦ0 に比べて相当大きくなる様にｄ1 ，ｄ
2 ，ｄ3 を選んだ場合には、Ｆ0 が零、即ち、ばねが折
損したような場合でも、必要な弁シート部押付け力Ｆを
Ｆｇだけでほぼカバーすることができるので、シール性
能を維持することができる。When the diameter of the large diameter portion 22 of the spindle 2 is d 1 , the diameter of the medium diameter portion 29 of the spindle 2 is d 2 and the diameter of the small diameter portion 31 of the spindle 2 is d 3 , the fuel gas causes The sheet pressing force Fg to be performed can be expressed by the following equation. That is, Then, assuming that the necessary valve seat portion pressing force is F, the required spring force F 0 is reduced as in the following equation. That is, F 0 = F−Fg Further, d 1 and d are set so that Fg becomes considerably larger than F 0.
When 2 and d 3 are selected, even if F 0 is zero, that is, the spring is broken, the required valve seat pressing force F can be almost covered with only Fg, so that the sealing performance is improved. Can be maintained.
【００１１】ここで、ばね力Ｆ0 を零としないのは、ガ
スが燃料弁に導入されていない場合でもスピンドルを弁
座（弁シート部）に押付けておくためである。従って、
本発明によれば、従来に比べて、小力のばねを用いても
従来並みのシール性能を確保することができると同時
に、ばね折損時においてもシート部押付け力を確保する
ことができる。その結果、ばねの小寸法化、及び、ばね
の小寸法化による噴射弁全体としての小型化が可能とな
り、コスト低減できると同時に、噴射弁装着対象物の設
計に自由度を持たせることができ、さらには、ばね折損
時のシリンダ内へのガス燃料の異常流出を防止すること
が可能で、弁としての安全性が向上する。Here, the spring force F 0 is not made zero because the spindle is pressed against the valve seat (valve seat portion) even when the gas is not introduced into the fuel valve. Therefore,
According to the present invention, even if a spring having a smaller force than that of the conventional one is used, it is possible to secure the same sealing performance as that of the conventional one, and at the same time, it is possible to secure the seat portion pressing force even when the spring is broken. As a result, the size of the spring can be reduced, and the size of the injection valve as a whole can be reduced by reducing the size of the spring. This can reduce the cost, and at the same time, allow flexibility in the design of the injection valve mounted object. Moreover, it is possible to prevent abnormal outflow of gas fuel into the cylinder when the spring is broken, which improves the safety of the valve.
【００１２】[0012]
【発明の効果】上記のように、本発明は、高圧燃料ガス
が充填される燃料ガス溜を貫通して延在するスピンドル
を有するガス燃料噴射弁において、前記スピンドルの背
後からスピンドルの中を通して弁シート部まで高圧燃料
ガスを導くようにしたので、従来に比べて、小力のばね
を用いても従来並みのシール性能を確保することができ
る。As described above, according to the present invention, in a gas fuel injection valve having a spindle extending through a fuel gas reservoir filled with high pressure fuel gas, the valve is passed from behind the spindle through the spindle. Since the high-pressure fuel gas is guided to the seat portion, it is possible to ensure the same sealing performance as that of the conventional case even if a spring having a small force is used as compared with the conventional case.
【００１３】従って、本発明によれば、ばねの小寸法
化、及び、ばねの小寸法化による噴射弁全体としての小
型化が可能となり、コスト低減できると同時に、噴射弁
装着対象物の設計に自由度を持たせることができる。さ
らには、ばね折損によるガス燃料の異常流出を防止で
き、安全性を高めることが可能である。Therefore, according to the present invention, it is possible to reduce the size of the spring and the size of the injection valve as a whole by reducing the size of the spring. You can have a degree of freedom. Further, it is possible to prevent abnormal outflow of gas fuel due to spring breakage, and it is possible to improve safety.
【図１】本発明に係るガス燃料噴射弁の要部拡大縦断面
図である。FIG. 1 is an enlarged vertical cross-sectional view of a main part of a gas fuel injection valve according to the present invention.
【図２】本発明に係るガス燃料噴射弁の縦断面図であ
る。FIG. 2 is a vertical sectional view of a gas fuel injection valve according to the present invention.
ａ 高圧燃料ガス ２ スピンドル ６ 燃料ガス溜 ３０ 弁シート部 a High-pressure fuel gas 2 Spindle 6 Fuel gas reservoir 30 Valve seat
───────────────────────────────────────────────────── フロントページの続き (72)発明者 池田 克己 千葉県市川市南大野２−４−Ｄ901 (72)発明者 東浦 克昌 大阪府大阪市中央区平野町四丁目１番２号 大阪瓦斯株式会社内 (72)発明者 石橋 幸司 愛知県東海市新宝町507−２ 東邦瓦斯株 式会社総合技術研究所内 (72)発明者 近藤 守男 岡山県玉野市玉３丁目１番１号 三井造船 株式会社玉野事業所内 (72)発明者 薦田 哲男 岡山県玉野市玉３丁目１番１号 三井造船 株式会社玉野事業所内 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Katsumi Ikeda 2-4-D901 Minamiono, Ichikawa-shi, Chiba (72) Inventor Katsumasa Higashi 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi, Osaka Osaka Gas Co., Ltd. (72) Inventor Koji Ishibashi 507-2 Shintakaracho, Tokai-shi, Aichi Toho Gas Co., Ltd. Research Institute of Technology (72) Inventor Morio Kondo 3-1-1 Tamama, Tamano-shi, Okayama Mitsui Engineering & Shipbuilding Co., Ltd. In-house (72) Inventor Tetsuo Komoda 3-1-1 Tam, Tamano-shi, Okayama Mitsui Engineering & Shipbuilding Co., Ltd. Tamano Works
Claims (1)
貫通して延在するスピンドルを有するガス燃料噴射弁に
おいて、前記スピンドルの背後からスピンドルの中を通
して弁シート部まで高圧燃料ガスを導くようにしたこと
を特徴とするガス燃料噴射弁。1. A gas fuel injection valve having a spindle extending through a fuel gas reservoir filled with high-pressure fuel gas, wherein the high-pressure fuel gas is guided from behind the spindle to the valve seat portion through the spindle. A gas fuel injection valve characterized in that
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7314974A JPH09151802A (en) | 1995-12-04 | 1995-12-04 | Gas fuel injection valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7314974A JPH09151802A (en) | 1995-12-04 | 1995-12-04 | Gas fuel injection valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09151802A true JPH09151802A (en) | 1997-06-10 |
Family
ID=18059916
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7314974A Withdrawn JPH09151802A (en) | 1995-12-04 | 1995-12-04 | Gas fuel injection valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09151802A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100679988B1 (en) * | 1999-09-17 | 2007-02-08 | 수어 창 양 | Grounding system monitor |
-
1995
- 1995-12-04 JP JP7314974A patent/JPH09151802A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100679988B1 (en) * | 1999-09-17 | 2007-02-08 | 수어 창 양 | Grounding system monitor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20030204 |