JP2519979Y2 - Fuel injection device for internal combustion engine - Google Patents
Fuel injection device for internal combustion engineInfo
- Publication number
- JP2519979Y2 JP2519979Y2 JP1990012750U JP1275090U JP2519979Y2 JP 2519979 Y2 JP2519979 Y2 JP 2519979Y2 JP 1990012750 U JP1990012750 U JP 1990012750U JP 1275090 U JP1275090 U JP 1275090U JP 2519979 Y2 JP2519979 Y2 JP 2519979Y2
- Authority
- JP
- Japan
- Prior art keywords
- fuel injection
- nozzle
- fuel
- combustion chamber
- tip
- 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 - Fee Related
Links
Landscapes
- Fuel-Injection Apparatus (AREA)
Description
【考案の詳細な説明】 〔産業上の利用分野〕 本考案は内燃機関用燃料噴射装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a fuel injection device for an internal combustion engine.
燃料噴射ノズル先端面を燃焼室内に配置し、ノズル先
端面に燃焼室内に向けて円錐状に拡開するノズル口を形
成すると共にノズル口周りのノズル先端面を平坦面に形
成した燃料噴射装置が公知である（特表昭63−500323号
公報参照）。この燃料噴射装置ではノズル口から圧縮空
気と共に燃料が噴射せしめられ、このとき圧縮空気およ
び燃料は円錐状ノズル口の内壁面に沿って進むので圧縮
空気および燃料はノズル口から燃焼室内に円錐状に拡が
ることになる。A fuel injection device is provided in which a tip end surface of a fuel injection nozzle is arranged in a combustion chamber, a nozzle opening that expands in a conical shape toward the combustion chamber is formed on the tip end surface of the nozzle, and a nozzle tip surface around the nozzle opening is formed into a flat surface. It is known (see Japanese Patent Publication No. 63-500323). In this fuel injection device, the fuel is injected together with the compressed air from the nozzle port. At this time, the compressed air and the fuel travel along the inner wall surface of the conical nozzle port, so that the compressed air and the fuel are conical from the nozzle port into the combustion chamber. It will spread.
しかしながらノズル口から燃料が噴射せしめられると
進行する燃料内にノズル口周りの空気が吸い込まれるた
めにノズル口周りの圧力はその他の部分に比べて低くな
る。特にノズル口から圧縮空気および燃料が噴出せしめ
られると噴出流体量がかなり多いためにノズル口周りの
圧力は一層低くなる。このようにノズル口周りの圧力が
低くなると一部の噴射燃料がノズル口周りに引き戻され
る。このときノズル口周りのノズル先端面が平坦面に形
成されていると引き戻された燃料が次第にノズル先端面
に付着し、ノズル先端面への付着燃料量が増大するにつ
れて付着燃料が後から付着した燃料によって外方に押し
やられるために燃料の付着領域がノズル口からノズル先
端部周りの燃焼室内壁面へ次第に拡大する。その結果、
ノズル先端面はもとよりノズル先端部周りの燃焼室内壁
面に燃料が付着することになる。このように燃料が付着
するとこの付着燃料はむし焼きの状態となるために多量
の未燃HC,COが発生するばかりでなく燃えカスである多
量のデポジットがノズル先端面および燃焼室内壁面に付
着するという問題を生ずる。However, when the fuel is injected from the nozzle port, the air around the nozzle port is sucked into the fuel that advances, so that the pressure around the nozzle port becomes lower than that in other portions. In particular, when compressed air and fuel are ejected from the nozzle port, the pressure around the nozzle port becomes lower because the amount of ejected fluid is considerably large. As described above, when the pressure around the nozzle opening decreases, part of the injected fuel is drawn back around the nozzle opening. At this time, if the nozzle tip surface around the nozzle opening is formed as a flat surface, the drawn back fuel gradually adheres to the nozzle tip surface, and as the amount of fuel adhering to the nozzle tip surface increases, the adhered fuel adheres later. Since the fuel is pushed outward, the fuel adhesion region gradually expands from the nozzle opening to the wall surface of the combustion chamber around the nozzle tip. as a result,
The fuel adheres not only to the nozzle tip surface but also to the wall surface of the combustion chamber around the nozzle tip. When fuel adheres in this way, the adhered fuel is in a smoldering state, so not only a large amount of unburned HC and CO are generated, but also a large amount of deposits, which are burning dust, adhere to the nozzle tip surface and the inner wall of the combustion chamber. The problem arises.
上記問題点を解決するために本考案によれば燃焼室内
に露呈する燃料噴射ノズル先端部内に燃焼室内に向けて
円錐状に拡開するノズル口を形成すると共に燃料噴射ノ
ズル先端部の外周面を燃焼室内に向けて次第に細くなる
円錐状に形成して燃料噴射ノズル先端部の断面形状をナ
イフエッジ状に形成し、燃料噴射ノズル先端部の円錐状
外周面周りをシリンダヘッド内壁面に対して陥没形成さ
れた環状溝によって包囲するようにしている。According to the present invention, in order to solve the above-mentioned problems, a nozzle opening that opens in a conical shape toward the combustion chamber is formed in the tip of the fuel injection nozzle exposed in the combustion chamber, and the outer peripheral surface of the tip of the fuel injection nozzle is formed. The tip of the fuel injection nozzle is shaped like a knife edge by forming a conical shape that tapers toward the combustion chamber, and the circumference of the conical outer surface of the tip of the fuel injection nozzle is depressed with respect to the inner wall surface of the cylinder head. It is surrounded by the formed annular groove.
ノズル先端部の断面形状をナイフエッジ状に形成し、
燃料噴射ノズル先端部の円錐状外周面周りを環状溝によ
って包囲すると引き戻された燃料のノズル先端部の外周
面上に到達しなくなるのでノズル先端部に燃料が付着す
ることがない。The cross-sectional shape of the nozzle tip is formed into a knife edge,
When the circumference of the conical outer peripheral surface of the fuel injection nozzle tip is surrounded by the annular groove, the drawn back fuel does not reach the outer peripheral surface of the nozzle tip, so that the fuel does not adhere to the nozzle tip.
第１図から第４図は本考案を２サイクル内燃機関に適
用した場合を示している。1 to 4 show the case where the present invention is applied to a two-cycle internal combustion engine.
第１図、第３図および第４図を参照すると、１はシリ
ンダブロック、２はピストン、３はシリンダヘッド、４
は燃焼室、５は点火栓、６は一対の給気弁、７は給気ポ
ート、８は一対の排気弁、９は排気ポート、10は燃料噴
射装置を夫々示す。ピストン２が下降するとまず始めに
排気弁８が開弁し、燃料室４内の既燃ガスが排気ポート
９内に排出される。次いで給気弁６が開弁すると図示し
ない過給機から送り出された新気が給気ポート７から燃
焼室４内に送り込まれる。次いで下死点を過ぎてピスト
ン２が上昇すると排気弁８が閉弁し、次いで給気弁６が
閉弁する。排気弁８が閉弁する直前又は閉弁した後に燃
料噴射装置10から圧縮空気と共に燃料が噴射され、この
噴射燃料が点火栓５によって着火せしめられる。第３図
および第４図に示されるようにシリンダヘッド３の内壁
面上には排気弁８側の給気弁６開口を給気弁６の全開弁
期間に亘って閉鎖するマスク壁11が形成される。従って
給気弁６が開弁すると新気が排気弁８と反対側の給気弁
６開口を通って燃焼室４内に流入し、次いでこの新気は
第４図においてＷで示されるように燃焼室４内をループ
状に流れるので良好なループ掃気が行われることにな
る。Referring to FIGS. 1, 3 and 4, 1 is a cylinder block, 2 is a piston, 3 is a cylinder head, 4
Is a combustion chamber, 5 is a spark plug, 6 is a pair of air supply valves, 7 is an air supply port, 8 is a pair of exhaust valves, 9 is an exhaust port, and 10 is a fuel injection device. When the piston 2 descends, the exhaust valve 8 first opens, and the burned gas in the fuel chamber 4 is discharged into the exhaust port 9. Next, when the air supply valve 6 is opened, the fresh air sent from a supercharger (not shown) is sent into the combustion chamber 4 from the air supply port 7. Next, when the piston 2 rises past the bottom dead center, the exhaust valve 8 closes, and then the air supply valve 6 closes. Immediately before or after the exhaust valve 8 is closed, fuel is injected together with compressed air from the fuel injection device 10, and the injected fuel is ignited by the spark plug 5. As shown in FIGS. 3 and 4, a mask wall 11 is formed on the inner wall surface of the cylinder head 3 to close the opening of the intake valve 6 on the exhaust valve 8 side for the full opening period of the intake valve 6. To be done. Therefore, when the intake valve 6 is opened, fresh air flows into the combustion chamber 4 through the opening of the intake valve 6 on the side opposite to the exhaust valve 8, and then this fresh air is indicated by W in FIG. Since it flows in a loop shape in the combustion chamber 4, good loop scavenging is performed.
第１図を参照すると燃料噴射装置10は燃焼室４内に配
置されたノズル口12と、ノズル口12の開閉制御を行う弁
体13と、弁体13を駆動するソレノイド14と、圧縮空気流
入口15と、圧縮空気流入口15からソレノイド14内を通
り、次いで一旦横方向に屈曲した後に弁体13周りを通っ
てノズル口12に至る圧縮空気通路16と、この圧縮空気通
路16内に配置された燃料噴射弁17とを具備する。圧縮空
気流入口15は圧縮空気供給ポンプ18に連結されており、
従って圧縮空気通路16内は常時圧縮空気によって満たさ
れている。一方、圧縮空気通路16内には燃料噴射弁17か
ら燃料が噴射される。ソレノイド14が励磁されて弁体13
がノズル口12を開口せしめると圧縮空気が燃料と共にノ
ズル口12から燃焼室４内に噴射せしめられる。Referring to FIG. 1, a fuel injection device 10 includes a nozzle opening 12 arranged in a combustion chamber 4, a valve body 13 for controlling opening / closing of the nozzle opening 12, a solenoid 14 for driving the valve body 13, and a compressed air flow. An inlet 15, a compressed air passage 16 that passes from the compressed air inlet 15 through the solenoid 14, and then bends laterally once and then passes around the valve body 13 to the nozzle opening 12, and is arranged in the compressed air passage 16. And a fuel injection valve 17 which is operated. The compressed air inlet 15 is connected to the compressed air supply pump 18,
Therefore, the compressed air passage 16 is constantly filled with compressed air. On the other hand, fuel is injected from the fuel injection valve 17 into the compressed air passage 16. When the solenoid 14 is excited, the valve body 13
When the nozzle opening 12 is opened, the compressed air is injected into the combustion chamber 4 through the nozzle opening 12 together with the fuel.
第２図（Ａ）および（Ｂ）に燃料噴射装置10のノズル
先端部20の拡大図を示す。第２図（Ａ）および（Ｂ）を
参照すると、ノズル先端部20はノズル先端部20周りのシ
リンダヘッド３の内壁面3aから燃焼室４内に向けて突出
しており、ノズル先端面21上には燃焼室４内に向けて円
錐状に拡開するノズル口12が形成される。一方、シリン
ダヘッド内壁面3aから突出するノズル先端部20の突出部
の外周面22は燃焼室４内に向けて次第に細くなる円錐状
に形成され、円錐状ノズル口12と円錐状突出部外周面22
間におけるノズル先端部20の断面形状はナイフエッジ状
に形成される。ナイフエッジ状とは云っても先端部には
面取りがなされており、従って上述したようにナイフエ
ッジ状の先端部を先端面21と称している。第２図（Ａ）
に示す実施例ではノズル先端部20周りのシリンダヘッド
内壁面3aは平坦に形成されている。これに対して第２図
（Ｂ）に示す実施例ではノズル先端部20周りのシリンダ
ヘッド内壁面3aの周囲の内壁面3bは燃焼室４内に向けて
拡開する円錐状に形成されており、従ってノズル先端部
20の周りにＶ字形をなす環状溝が形成されているような
形となる。2 (A) and 2 (B) are enlarged views of the nozzle tip portion 20 of the fuel injection device 10. Referring to FIGS. 2A and 2B, the nozzle tip portion 20 projects from the inner wall surface 3 a of the cylinder head 3 around the nozzle tip portion 20 toward the inside of the combustion chamber 4, and is located on the nozzle tip surface 21. Is formed with a nozzle opening 12 that expands in a conical shape toward the inside of the combustion chamber 4. On the other hand, the outer peripheral surface 22 of the protruding portion of the nozzle tip portion 20 protruding from the inner wall surface 3a of the cylinder head is formed in a conical shape that gradually becomes thinner toward the inside of the combustion chamber 4, and the conical nozzle port 12 and the outer peripheral surface of the conical protruding portion are formed. twenty two
The cross-sectional shape of the nozzle tip portion 20 in the gap is formed into a knife edge shape. Even if it is a knife edge shape, the tip portion is chamfered, so that the knife edge shaped tip portion is referred to as the tip surface 21 as described above. Figure 2 (A)
In the embodiment shown in, the cylinder head inner wall surface 3a around the nozzle tip portion 20 is formed flat. On the other hand, in the embodiment shown in FIG. 2B, the inner wall surface 3b around the cylinder head inner wall surface 3a around the nozzle tip portion 20 is formed in a conical shape that expands toward the inside of the combustion chamber 4. , Therefore the nozzle tip
The shape is such that a V-shaped annular groove is formed around 20.
弁体13がノズル口12を開口せしめると圧縮空気および
燃料がノズル口12から燃焼室４内に噴出せしめられる。
このとき圧縮空気および燃料はノズル口12の円錐状内壁
面に沿って進行するので圧縮空気および燃料は燃焼室４
内に円錐状に広がることになる。ところがこのように圧
縮空気および燃料がノズル口12から噴出すると圧縮空気
および燃料はノズル口12から噴出するや否や周りの空気
を引き込み、斯くして噴出した圧縮空気および燃料の周
りの圧力が低下する。しかしながら第２図に示されるよ
うにノズル先端部20の周りが円錐状外周面22から形成さ
れていると従来のようにノズル先端面21が広い面積を有
する場合に比べてノズル先端面21周りの空気量が多いた
めにノズル先端面21周りの圧力がさほど低下しなくな
る。その結果、ノズル先端面21周りに向かう燃料の引き
込み作用が弱くなる。しかもノズル先端部20の周りが円
錐状外周面22から形成されているので噴出した燃料と円
錐状外周面22間の距離が長くなり、斯くして噴射燃料が
円錐状外周面22上に到達しなくなる。その結果、円錐状
外周面22上に燃料が付着するのを阻止することができ
る。更にこのように円錐状外周面22上に燃料が付着しな
くなるので付着燃料が外方に広がって燃料の付着領域が
広がることもない、斯くして未燃HC,COの発生を阻止で
きると共に燃料の燃えカスであるデポジットがノズル先
端部20の外周面およびシリンダヘッド３の内壁面上に付
着するのを阻止することができる。When the valve body 13 opens the nozzle opening 12, compressed air and fuel are ejected from the nozzle opening 12 into the combustion chamber 4.
At this time, the compressed air and the fuel travel along the conical inner wall surface of the nozzle opening 12, so that the compressed air and the fuel move to the combustion chamber 4
It will spread in a cone. However, when the compressed air and the fuel are ejected from the nozzle opening 12 as described above, the compressed air and the fuel are drawn in from the surrounding air as soon as they are ejected from the nozzle opening 12, thus the pressure around the ejected compressed air and the fuel is reduced. . However, as shown in FIG. 2, when the periphery of the nozzle tip 20 is formed of the conical outer peripheral surface 22, the circumference of the nozzle tip 21 is smaller than that in the conventional case where the nozzle tip 21 has a large area. Since the amount of air is large, the pressure around the nozzle tip surface 21 does not drop so much. As a result, the action of drawing the fuel toward the nozzle tip surface 21 is weakened. Moreover, since the periphery of the nozzle tip portion 20 is formed from the conical outer peripheral surface 22, the distance between the ejected fuel and the conical outer peripheral surface 22 becomes long, so that the injected fuel reaches the conical outer peripheral surface 22. Disappear. As a result, it is possible to prevent fuel from adhering to the conical outer peripheral surface 22. Further, since the fuel does not adhere to the conical outer peripheral surface 22 in this way, the adhered fuel does not spread outward and the fuel adhesion region does not expand, and thus it is possible to prevent the generation of unburned HC and CO and It is possible to prevent the deposit, which is a burned residue, from adhering to the outer peripheral surface of the nozzle tip portion 20 and the inner wall surface of the cylinder head 3.
噴射された燃料がノズル先端部の外周面上および燃焼
室内壁面上に付着するのを阻止することができるので未
燃HC,COが発生するのを阻止できると共に燃焼生成物で
あるデポジットが付着するのを阻止することができる。Since it is possible to prevent the injected fuel from adhering to the outer peripheral surface of the nozzle tip and the inner wall surface of the combustion chamber, it is possible to prevent the generation of unburned HC and CO, and the deposit of combustion products is attached. Can be prevented.
第１図は第３図のＩ−Ｉ線に沿ってみた２サイクル内燃
機関の側面断面図、第２図は燃料噴射装置のノズル先端
部の拡大断面図、第３図はシリンダヘッドの底面図、第
４図は第３図のIV−IV線に沿ってみた側面断面図であ
る。 ４……燃焼室、12……ノズル口、20……ノズル先端部、
21……ノズル先端面、22……突出部外周面。1 is a side sectional view of a two-cycle internal combustion engine taken along line I-I in FIG. 3, FIG. 2 is an enlarged sectional view of a nozzle tip portion of a fuel injection device, and FIG. 3 is a bottom view of a cylinder head. 4 is a side sectional view taken along the line IV-IV in FIG. 4 ... Combustion chamber, 12 ... Nozzle port, 20 ... Nozzle tip,
21 …… Nozzle tip surface, 22 …… Outer peripheral surface.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｆ０２Ｍ 67/02 Ｆ０２Ｍ 67/02 (56)参考文献 特開 昭58−131307（ＪＰ，Ａ) 特開 昭62−20671（ＪＰ，Ａ) 特開 平３−43666（ＪＰ，Ａ) 特開 平５−503977（ＪＰ，Ａ) 特開 平３−54365（ＪＰ，Ａ)─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI Technical display location F02M 67/02 F02M 67/02 (56) References JP-A-58-131307 (JP, A) Special features Kai 62-20671 (JP, A) JP 3-43666 (JP, A) JP 5-503977 (JP, A) JP 3-54365 (JP, A)
Claims (1)
内に燃焼室内に向けて円錐状に拡開するノズル口を形成
すると共に燃料噴射ノズル先端部の外周面を燃焼室内に
向けて次第に細くなる円錐状に形成して燃料噴射ノズル
先端部の断面形状をナイフエッジ状に形成し、上記燃料
噴射ノズル先端部の円錐状外周面周りをシリンダヘッド
内壁面に対して陥没形成された環状溝によって包囲する
ようにした内燃機関用燃料噴射装置。1. A nozzle opening, which is conically expanded toward the combustion chamber, is formed in the tip of the fuel injection nozzle exposed in the combustion chamber, and the outer peripheral surface of the tip of the fuel injection nozzle is gradually narrowed toward the combustion chamber. The tip of the fuel injection nozzle is formed into a conical shape so that the cross-sectional shape of the tip of the fuel injection nozzle is formed into a knife edge, and the circumference of the conical outer peripheral surface of the tip of the fuel injection nozzle is surrounded by an annular groove that is recessed with respect to the inner wall of the cylinder head A fuel injection device for an internal combustion engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990012750U JP2519979Y2 (en) | 1990-02-14 | 1990-02-14 | Fuel injection device for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990012750U JP2519979Y2 (en) | 1990-02-14 | 1990-02-14 | Fuel injection device for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03104172U JPH03104172U (en) | 1991-10-29 |
| JP2519979Y2 true JP2519979Y2 (en) | 1996-12-11 |
Family
ID=31516207
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1990012750U Expired - Fee Related JP2519979Y2 (en) | 1990-02-14 | 1990-02-14 | Fuel injection device for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2519979Y2 (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US369510A (en) * | 1887-09-06 | Method of constructing wagon-seats | ||
| DE3147015A1 (en) * | 1981-11-27 | 1983-06-01 | M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8500 Nürnberg | AIR-COMPRESSING, DIRECT-INJECTING ENGINE |
| CA1269003A (en) * | 1985-07-15 | 1990-05-15 | David P. Sczomak | Poppet covered orifice fuel injection nozzle |
| US5036824A (en) * | 1989-06-21 | 1991-08-06 | General Motors Corporation | Fuel injection |
| AU647770B2 (en) * | 1990-01-26 | 1994-03-31 | Orbital Australia Pty Ltd | Fuel injector nozzle |
| JP2526627Y2 (en) * | 1990-07-09 | 1997-02-19 | トヨタ自動車株式会社 | Fuel injection valve for internal combustion engine |
-
1990
- 1990-02-14 JP JP1990012750U patent/JP2519979Y2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03104172U (en) | 1991-10-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1130240A3 (en) | Cylinder injection engine and control apparatus and method thereof | |
| US5237966A (en) | Fuel injection system for the two cycle engine | |
| EP0894967A3 (en) | Piston for internal combustion engine | |
| JPH0352379U (en) | ||
| JPH07117019B2 (en) | 2-cycle internal combustion engine | |
| JP2519979Y2 (en) | Fuel injection device for internal combustion engine | |
| JP3109307B2 (en) | Sub-chamber diesel engine | |
| JP2767005B2 (en) | Air blast valve | |
| JP2523138Y2 (en) | Fuel injection valve for internal combustion engine | |
| JPH0261364A (en) | Fuel feeding device for two-cycle engine | |
| JP2581185B2 (en) | Fuel injection device for internal combustion engine | |
| JP3116612B2 (en) | In-cylinder direct injection diesel engine | |
| JP2732716B2 (en) | Air blast valve | |
| JPH0649858Y2 (en) | 2-cycle diesel engine | |
| JP2767004B2 (en) | Air blast valve | |
| JPH0352338U (en) | ||
| JPH087059Y2 (en) | 2-cycle diesel engine | |
| JPS5746018A (en) | Intake device for engine supplied with laminar mixture | |
| JPH05280344A (en) | Two cycle internal combustion engine | |
| JPH04116223A (en) | Two-cycle diesel engine having sub-chamber | |
| JPH0649857Y2 (en) | 2-cycle diesel engine | |
| JPH0636289Y2 (en) | Fuel injection device for internal combustion engine | |
| JPS5847225Y2 (en) | Internal combustion engine air supply system | |
| JP2518278Y2 (en) | Fuel injection device for internal combustion engine | |
| JPH0724586Y2 (en) | Combustion promoting device for internal combustion engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |