JP2001263069A - Torch ignition type engine - Google Patents
Torch ignition type engineInfo
- Publication number
- JP2001263069A JP2001263069A JP2000079944A JP2000079944A JP2001263069A JP 2001263069 A JP2001263069 A JP 2001263069A JP 2000079944 A JP2000079944 A JP 2000079944A JP 2000079944 A JP2000079944 A JP 2000079944A JP 2001263069 A JP2001263069 A JP 2001263069A
- Authority
- JP
- Japan
- Prior art keywords
- torch
- chamber
- sub
- combustion chamber
- 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.)
- Granted
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
- Y02T10/12—Improving ICE efficiencies
-
- 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
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、シリンダヘッドに
設けられた副燃焼室にトーチ点火用燃料を導き、点火プ
ラグにより該トーチ点火用燃料に着火し、燃料トーチを
前記シリンダヘッドに設けられた副室口金の複数の噴孔
から主燃焼室内の混合気中に噴出させて、該混合気を燃
焼させるトーチ点火式エンジンに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel injection device in which a torch ignition fuel is guided to a sub-combustion chamber provided in a cylinder head, and the torch ignition fuel is ignited by a spark plug. The present invention relates to a torch-ignition engine in which a plurality of injection holes of a sub-chamber base are jetted into an air-fuel mixture in a main combustion chamber to burn the air-fuel mixture.
【０００２】[0002]
【従来の技術】図４は、トーチ点火式エンジンの燃焼室
及び燃料供給系を示す要部断面図及び噴孔５１の配置構
造の従来の一例を示したものであり、図５は噴孔５１の
平面配置図である。８はシリンダヘッド、２は主燃焼室
であり、該主燃焼室２はピストンの上面とシリンダの内
面と前記シリンダヘッド８の下面により区画形成されて
いる。この主燃焼室２には燃料ガスと空気の混合気が吸
気弁を介して導入されるようになっている。１４はピス
トン、５３は該ピストン上面の吸気弁リセス、５４は排
気弁リセス、１４ａはピストンの触火面である。2. Description of the Related Art FIG. 4 is a sectional view of a main part showing a combustion chamber and a fuel supply system of a torch ignition type engine and an example of a conventional arrangement of injection holes 51, and FIG. FIG. Reference numeral 8 denotes a cylinder head, and 2 denotes a main combustion chamber. The main combustion chamber 2 is defined by an upper surface of a piston, an inner surface of a cylinder, and a lower surface of the cylinder head 8. A mixture of fuel gas and air is introduced into the main combustion chamber 2 via an intake valve. 14 is a piston, 53 is an intake valve recess on the upper surface of the piston, 54 is an exhaust valve recess, and 14a is a sparking surface of the piston.
【０００３】１は副燃焼室であり、副燃焼室１はシリン
ダヘッド８の略中央部に形成され、シリンダ軸線３５方
向に軸方向を有する筒状である。該副燃焼室１の上部に
は副室上部金物６が、下部には副室口金４が夫々設けら
れている。該副室口金４の先端部には、１個又は複数の
噴孔５１が穿孔されている。９は前記副室上部金物６内
に形成されたガスチャンバであり、該ガスチャンバ９は
ガス通路１０を介してガス供給管１１に連通されてい
る。５は前記副室上部金物６内に往復摺動可能に設けら
れた副室弁で、前記ガスチャンバ９と副燃焼室１との間
を開閉する。[0003] Reference numeral 1 denotes a sub-combustion chamber. The sub-combustion chamber 1 is formed substantially at the center of a cylinder head 8 and has a cylindrical shape having an axial direction in the direction of a cylinder axis 35. A sub-chamber upper metal part 6 is provided in an upper part of the sub-combustion chamber 1, and a sub-chamber base 4 is provided in a lower part thereof. One or a plurality of injection holes 51 are drilled at the tip of the sub chamber base 4. Reference numeral 9 denotes a gas chamber formed in the metal fitting 6 above the sub-chamber. The gas chamber 9 is connected to a gas supply pipe 11 via a gas passage 10. Reference numeral 5 denotes a sub-chamber valve slidably provided in the sub-chamber upper metal part 6 for opening and closing the gas chamber 9 and the sub-combustion chamber 1.
【０００４】７は前記副燃焼室１内の燃料ガスに点火す
るための点火プラグである。１２は前記ガス供給管１１
に設けられたガス圧制御装置、１３は該ガス圧制御装置
１２に制御信号を送るコントローラである。[0004] Reference numeral 7 denotes a spark plug for igniting the fuel gas in the sub-combustion chamber 1. 12 is the gas supply pipe 11
Is a controller for sending a control signal to the gas pressure controller 12.
【０００５】このようなトーチ点火式エンジンの運転時
においては、トーチ点火用の燃料ガスはガス供給管１１
を通り、ガス圧制御装置１２で圧力を設定圧力になるよ
うに調整された後、副室上部金物６内のガス通路１０を
経てガスチャンバ９に入る。そして、該トーチ点火用燃
料ガスは、クランク軸（図示省略）の回転に基づく弁開
閉制御装置（図示省略）からの開閉信号により前記副室
弁５が開かれると前記副燃焼室１内に流入する。[0005] During operation of such a torch ignition type engine, fuel gas for torch ignition is supplied to the gas supply pipe 11.
After the pressure is adjusted to a set pressure by the gas pressure controller 12, the gas enters the gas chamber 9 through the gas passage 10 in the metal fitting 6 above the sub-chamber. The torch ignition fuel gas flows into the sub-combustion chamber 1 when the sub-chamber valve 5 is opened by an opening / closing signal from a valve opening / closing control device (not shown) based on the rotation of a crankshaft (not shown). I do.
【０００６】一方、前記主燃焼室２内には高効率、低Ｎ
Ｏｘの燃焼を実現するため、燃料量が希薄状態の燃料と
空気との混合気が吸気弁（図示省略）を経て吸入され
る。そして、エンジンの回転に連動した点火装置（図示
省略）により前記点火プラグ７に高電圧が付与される
と、点火プラグ７からの火花放電により副燃焼室１内の
トーチ点火用燃料ガスが着火、燃焼する。この着火がな
されたトーチ点火用燃料ガスは燃焼トーチとして噴孔５
１から前記主燃焼室２内に噴出され、該主燃焼室２内の
希薄混合気を燃焼させる。On the other hand, high efficiency, low N
In order to realize the combustion of Ox, a mixture of fuel and air in a fuel-lean state is sucked through an intake valve (not shown). When a high voltage is applied to the ignition plug 7 by an ignition device (not shown) linked to the rotation of the engine, the torch ignition fuel gas in the sub-combustion chamber 1 is ignited by spark discharge from the ignition plug 7, Burn. The ignited torch ignition fuel gas is used as a combustion torch in the injection hole 5.
1 is injected into the main combustion chamber 2 to burn the lean mixture in the main combustion chamber 2.
【０００７】上記の従来技術において、噴孔５１は同一
径のものが円周方向等間隔に４個（通常２個以上）設け
られ、噴孔軸線５２のシリンダ軸線下方向に対する開き
角度α０は６０°程度に設定されている。In the prior art described above, four (usually two or more) injection holes 51 having the same diameter are provided at regular intervals in the circumferential direction, and the opening angle α0 of the injection hole axis 52 with respect to the downward direction of the cylinder axis is 60. ° is set to about.
【０００８】[0008]
【発明が解決しようとする課題】図４及び図５に示され
ている従来技術に係るトーチ点火式エンジンにおいて
は、副燃焼室１内で着火がなされたトーチ点火用ガス
は、各噴孔から開き角度α０（６０°程度）の方向に主
燃焼室２内に噴出され、該主燃焼室２内の希薄混合気を
燃焼させる。In the torch ignition type engine according to the prior art shown in FIGS. 4 and 5, the torch ignition gas ignited in the sub-combustion chamber 1 passes through each injection hole. The fuel is injected into the main combustion chamber 2 in the direction of the opening angle α0 (about 60 °) to burn the lean mixture in the main combustion chamber 2.
【０００９】しかしながら、かかる従来技術にあって
は、副燃焼室１からの燃焼トーチを６０°程度の開き角
度α０で主燃焼室２内に噴出して、該主燃焼室２内の希
薄混合気を燃焼せしめるように構成されているため、噴
孔軸線５２近傍の希薄混合気の燃焼は完全になされる
が、該噴孔軸線５２から離れている主燃焼室２の外周の
壁面近傍には、噴孔５１から噴出された燃焼トーチが行
き渡り難い。このため、この壁面近傍の混合気の燃焼が
充分になされずに、未燃ガスとして排出され、燃焼効率
が低下してエンジンの高効率化が阻害され、また、未燃
ガスの排出は大気汚染の要因となる。However, in the prior art, the combustion torch from the sub-combustion chamber 1 is jetted into the main combustion chamber 2 at an opening angle α0 of about 60 °, and the lean mixture in the main combustion chamber 2 is discharged. Is burned, so that the lean mixture near the injection hole axis 52 is completely burned, but near the outer wall surface of the main combustion chamber 2 distant from the injection hole axis 52, The combustion torch ejected from the injection hole 51 is difficult to spread. Therefore, the air-fuel mixture in the vicinity of the wall surface is not sufficiently burned and is discharged as unburned gas, and the combustion efficiency is reduced, thereby hindering an increase in the efficiency of the engine. Is a factor.
【００１０】従って、本発明は、上記の事情に鑑みて、
トーチ点火式エンジンにおいて、副燃焼室から主燃焼室
に噴出される燃焼トーチを、主燃焼室内全体に拡散且つ
浸透させ、該主燃焼室内の希薄混合気を完全燃焼させ燃
焼効率を向上し、未燃ガスの排出を抑制することを目的
とする。[0010] Accordingly, the present invention has been made in view of the above circumstances,
In a torch ignition type engine, a combustion torch ejected from a sub-combustion chamber to a main combustion chamber is diffused and permeated throughout the main combustion chamber to completely burn a lean mixture in the main combustion chamber to improve combustion efficiency. The purpose is to suppress the emission of fuel gas.
【００１１】[0011]
【課題を解決するための手段】〔構成１〕本発明に係る
トーチ点火式エンジンは、請求項１に記載したごとく、
前記複数の噴孔が、シリンダ軸線下方向に対する噴孔軸
線の開き角度が８５°〜１２０°の範囲内に設定された
横向噴孔を有して構成されていることを特徴とする。 〔作用効果〕本構成のごとく、複数の噴孔の一部若しく
は全部を、前記横向噴孔として構成することで、副燃焼
室にて点火プラグにより着火燃焼した燃焼トーチは、横
向噴孔からシリンダ軸線下方向に対して８５°〜１２０
°の範囲内の開き角度を有して主燃焼室に噴出される。
このように大きな開き角度を有して燃焼トーチを噴出す
ると、その燃焼トーチは、主燃焼室の外周近傍に大きく
拡散して、従来未燃ガスが発生していた主燃焼室外周部
の混合気をも充分に燃焼させることができる。また、上
記の横向噴孔の開き角度が８５°以上であることで、横
向噴孔から噴出される燃焼トーチが、ピストンの触火面
に衝突して熱を奪われることを抑制し、さらに、横向噴
孔の開き角度が１２０°以下であることで、横向噴孔か
ら噴出される燃焼トーチが、燃焼室天井面（シリンダヘ
ッド下面）に衝突して熱を奪われることを抑制すること
ができるので、燃焼トーチを確実に外周部の混合気に噴
出して燃焼させることができる。さらに、横向噴孔の開
き角度は９０°±１０°程度が好ましく、横向噴孔から
噴出される燃焼トーチを好ましい状態で主燃焼室全体に
行き渡らせることができる。従って、主燃焼室内の希薄
混合気を完全燃焼させ燃焼効率を向上し、未燃ガスの排
出を抑制することができるトーチ点火式エンジンを実現
することができる。Means for Solving the Problems [Structure 1] A torch ignition type engine according to the present invention has the following features.
The plurality of injection holes have a horizontal injection hole in which an opening angle of the injection hole axis with respect to the cylinder axis downward direction is set within a range of 85 ° to 120 °. [Effects] By configuring a part or all of the plurality of injection holes as the horizontal injection holes as in the present configuration, the combustion torch ignited and burned by the ignition plug in the sub-combustion chamber can move from the horizontal injection holes to the cylinder. 85 ° to 120 with respect to the downward direction of the axis
It is injected into the main combustion chamber with an opening angle in the range of °.
When the combustion torch is ejected with such a large opening angle, the combustion torch diffuses greatly near the outer periphery of the main combustion chamber, and the air-fuel mixture at the outer periphery of the main combustion chamber where unburned gas has been generated conventionally. Can also be sufficiently burned. In addition, since the opening angle of the horizontal injection hole is 85 ° or more, the combustion torch ejected from the horizontal injection hole suppresses the collision with the igniting surface of the piston and deprives the heat, and further, When the opening angle of the horizontal injection hole is 120 ° or less, it is possible to prevent the combustion torch ejected from the horizontal injection hole from colliding with the ceiling surface of the combustion chamber (the lower surface of the cylinder head) and taking heat. Therefore, the combustion torch can be reliably ejected to the air-fuel mixture on the outer peripheral portion and burned. Further, the opening angle of the horizontal injection hole is preferably about 90 ° ± 10 °, and the combustion torch ejected from the horizontal injection hole can be spread over the entire main combustion chamber in a preferable state. Therefore, it is possible to realize a torch-ignition engine that can completely burn the lean mixture in the main combustion chamber, improve the combustion efficiency, and suppress the emission of unburned gas.
【００１２】〔構成２〕本発明に係るトーチ点火式エン
ジンは、請求項２に記載したごとく、上記構成１のトー
チ点火式エンジンの構成に加えて、前記横向噴孔が、前
記副室口金の軸線上で、前記シリンダヘッドの下面から
上死点時のピストンの上面までの１／３〜２／３の範囲
内の位置に設けられていることを特徴とする。 〔作用効果〕本構成のごとく、シリンダ軸線と平行な副
室口金の軸線状でシリンダヘッドの下面から上死点時の
ピストンの上面までの１／３〜２／３の範囲内の位置
に、横向噴孔の前記主燃焼室における開口中心がくるよ
うに構成することで、燃焼トーチを、上死点時の主燃焼
室においてシリンダ軸線のほぼ中央から主燃焼室に噴出
させることができ、燃焼トーチが主燃焼室天井（シリン
ダヘッド下面）若しくは主燃焼室底面（ピストン上面）
によって冷却されることなく、主燃焼室の混合気全体を
燃焼させることができる。また、横向噴孔の位置が、シ
リンダヘッドの下面から上死点時のピストンの上面まで
の１／３より下方であることで、燃焼室天井面（シリン
ダヘッド下面）による燃焼トーチの冷却を抑制し、さら
に、横向噴孔の位置が、シリンダヘッドの下面から上死
点時のピストンの上面までの２／３より上方であること
で、燃焼室底面による燃焼トーチの冷却を抑制すること
ができる。従って、より好ましい状態で燃焼トーチを噴
出させて主燃焼室内の混合気を充分に燃焼させて、より
高効率なトーチ点火式エンジンを実現することができ
る。[Structure 2] A torch-ignition engine according to the present invention, in addition to the structure of the torch-ignition engine of the above-described Structure 1, has a configuration in which the lateral injection hole is formed of the sub-chamber base. On the axis, it is provided at a position within a range of 1/3 to 2/3 from the lower surface of the cylinder head to the upper surface of the piston at the top dead center. [Function and Effect] As in this configuration, the position of the axis of the sub-chamber base parallel to the cylinder axis is within the range of 1/3 to 2/3 from the lower surface of the cylinder head to the upper surface of the piston at the top dead center. By configuring the center of the opening of the horizontal injection hole in the main combustion chamber to be located, the combustion torch can be injected into the main combustion chamber from substantially the center of the cylinder axis in the main combustion chamber at the top dead center. The torch is the main combustion chamber ceiling (cylinder head bottom) or the main combustion chamber bottom (piston top)
Thus, the entire air-fuel mixture in the main combustion chamber can be burned without being cooled. In addition, since the position of the horizontal injection hole is lower than 1/3 from the lower surface of the cylinder head to the upper surface of the piston at the top dead center, the cooling of the combustion torch by the combustion chamber ceiling surface (cylinder head lower surface) is suppressed. Further, since the position of the horizontal injection hole is higher than 2/3 from the lower surface of the cylinder head to the upper surface of the piston at the top dead center, the cooling of the combustion torch by the bottom of the combustion chamber can be suppressed. . Therefore, the combustion torch is ejected in a more preferable state, and the air-fuel mixture in the main combustion chamber is sufficiently burned, so that a more efficient torch ignition type engine can be realized.
【００１３】〔構成３〕本発明に係るトーチ点火式エン
ジンは、請求項３に記載したごとく、上記構成１又は２
のトーチ点火式エンジンの構成に加えて、前記副室口金
が前記シリンダヘッドの中央部に設けられ、前記横向噴
孔が前記副室口金の外周において周方向等間隔に配設さ
れていることを特徴とする。 〔作用効果〕本構成のごとく、シリンダヘッドの中央部
に設けられた副室口金の外周において周方向等間隔に複
数の横向噴孔を設けることで、主燃焼室の中央部から外
向き均等に燃焼トーチを噴出させることができ、主燃焼
室の混合気を均一且つ充分に燃焼させることができる。
従って、より好ましい状態で燃焼トーチを噴出させて主
燃焼室内の混合気を充分に燃焼させて、より高効率なト
ーチ点火式エンジンを実現することができる。[Structure 3] The torch ignition type engine according to the present invention is characterized in that, as set forth in claim 3, the structure 1 or 2 described above.
In addition to the configuration of the torch ignition type engine, the sub-chamber base is provided at the center of the cylinder head, and the horizontal injection holes are arranged at equal circumferential intervals on the outer periphery of the sub-chamber base. Features. [Effects] As in the present configuration, by providing a plurality of lateral injection holes at equal circumferential intervals on the outer periphery of the sub-chamber base provided at the center of the cylinder head, it is possible to evenly outward from the center of the main combustion chamber. The combustion torch can be ejected, and the air-fuel mixture in the main combustion chamber can be uniformly and sufficiently burned.
Therefore, the combustion torch is ejected in a more preferable state, and the air-fuel mixture in the main combustion chamber is sufficiently burned, so that a more efficient torch ignition type engine can be realized.
【００１４】[0014]
【発明の実施の形態】本発明のトーチ点火式エンジンに
ついて、図面に基づいて説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A torch ignition type engine according to the present invention will be described with reference to the drawings.
【００１５】図１は、本発明に係るトーチ点火式エンジ
ンの燃焼室及び燃料供給系を示す要部断面図、図２は噴
孔３１の配置構造図、図３は噴孔３１の平面配置図であ
る。同図において、トーチ点火式エンジンは、燃料とし
て天然ガス系都市ガスを利用したガスエンジンとして構
成されている。８はシリンダヘッド、２は主燃焼室であ
り、該主燃焼室２はピストンの上面とシリンダの内面と
前記シリンダヘッド８の下面により区画形成されてい
る。この主燃焼室２には燃料ガスと空気の混合気が吸気
弁を介して導入されるようになっている。１４はピスト
ン、５３は該ピストン上面の吸気弁リセス、５４は排気
弁リセス、１４ａはピストンの触火面であり、３５はシ
リンダ軸線である。また、３３は後述する横向噴孔３１
の軸線である。FIG. 1 is a sectional view of a main part showing a combustion chamber and a fuel supply system of a torch ignition type engine according to the present invention, FIG. 2 is a structural view of an arrangement of an injection hole 31, and FIG. It is. In FIG. 1, the torch ignition engine is configured as a gas engine using natural gas-based city gas as fuel. Reference numeral 8 denotes a cylinder head, and 2 denotes a main combustion chamber. The main combustion chamber 2 is defined by an upper surface of a piston, an inner surface of a cylinder, and a lower surface of the cylinder head 8. A mixture of fuel gas and air is introduced into the main combustion chamber 2 via an intake valve. 14 is a piston, 53 is an intake valve recess on the upper surface of the piston, 54 is an exhaust valve recess, 14a is a firing surface of the piston, and 35 is a cylinder axis. 33 is a lateral injection hole 31 described later.
Axis.
【００１６】１は副燃焼室であり、シリンダヘッド８の
略中央部にシリンダ軸線３５方向を長手方向として形成
されている。該副燃焼室１の上部には副室上部金物６
が、下部には副室口金４が夫々設けられている。該副室
口金４の先端部には、１個又は複数の噴孔３１が穿孔さ
れている。９は前記副室上部金物６内に形成されたガス
チャンバであり、該ガスチャンバ９はガス通路１０を介
してガス供給管１１に連通されている。５は前記副室上
部金物６内に往復摺動可能に設けられた副室弁で、前記
ガスチャンバ９と副燃焼室１との間を開閉する。Reference numeral 1 denotes a sub-combustion chamber, which is formed substantially in the center of the cylinder head 8 with the direction of the cylinder axis 35 as a longitudinal direction. On the upper part of the sub-combustion chamber 1 is a sub-chamber upper hardware
However, sub-chamber bases 4 are provided at the lower part, respectively. One or a plurality of injection holes 31 are drilled at the tip of the sub chamber base 4. Reference numeral 9 denotes a gas chamber formed in the metal fitting 6 above the sub-chamber. The gas chamber 9 is connected to a gas supply pipe 11 via a gas passage 10. Reference numeral 5 denotes a sub-chamber valve slidably provided in the sub-chamber upper metal part 6 for opening and closing the gas chamber 9 and the sub-combustion chamber 1.
【００１７】７は前記副燃焼室１内の燃料ガスに点火す
るための点火プラグである。１２は前記ガス供給管１１
に設けられたガス圧制御装置、１３は該ガス圧制御装置
１２に制御信号を送るコントローラである。本発明に係
るトーチ点火式エンジンは、副燃焼室からの燃焼トーチ
噴出用横向噴孔３１に特徴を有する。Reference numeral 7 denotes a spark plug for igniting the fuel gas in the sub-combustion chamber 1. 12 is the gas supply pipe 11
Is a controller for sending a control signal to the gas pressure controller 12. The torch ignition type engine according to the present invention is characterized by a horizontal injection hole 31 for jetting a combustion torch from a sub-combustion chamber.
【００１８】前記横向噴孔３１は、前記副室口金４に周
方向等間隔（α２＝６０°）に６個、かつ大噴孔３１ａ
と大噴孔３１ａよりも開口径が小さい小噴孔３１ｂとが
交互に配置されるように穿孔され、シリンダ軸線３５の
下方向に対する噴孔軸線３３の開き角度α１が９０°と
なるように構成されている。また、夫々の噴孔軸線３３
ａ，３３ｂとシリンダ軸線３５の交点がすべて一致して
おり、その交点はピストン上死点時の主燃焼室２におけ
るシリンダ軸線３５の略中心部である。即ち、大噴孔３
１ａ及び小噴孔３１ｂは、シリンダヘッド８の下面から
上死点時のピストン１４の上面までの約１／２の位置に
配置されている。There are six horizontal injection holes 31 at equal intervals in the circumferential direction (α2 = 60 °) in the sub-chamber base 4 and large injection holes 31a.
And small injection holes 31b having an opening diameter smaller than that of the large injection holes 31a are alternately arranged, and the opening angle α1 of the injection hole axis 33 with respect to the downward direction of the cylinder axis 35 is 90 °. Have been. In addition, each injection hole axis 33
All the intersections of a, 33b and the cylinder axis 35 coincide, and the intersection is substantially the center of the cylinder axis 35 in the main combustion chamber 2 at the time of the piston top dead center. That is, the large injection hole 3
The small injection holes 1a and the small injection holes 31b are arranged at about 1/2 positions from the lower surface of the cylinder head 8 to the upper surface of the piston 14 at the top dead center.
【００１９】このような横向噴孔３１を備えた本発明の
トーチ点火式エンジンの運転時においては、トーチ点火
用の燃料ガスはガス供給管１１を通り、ガス圧制御装置
１２で圧力を設定圧力になるように調整された後、軸室
上部金物６内のガス通路１０を経てガスチャンバ９に入
る。そして、該トーチ点火用燃料ガスは、クランク軸
（図示省略）の回転に基づく弁開閉制御装置（図示省
略）からの開閉信号により前記副室弁５が開かれると前
記副燃焼室１内に流入する。During operation of the torch ignition type engine of the present invention having such a horizontal injection hole 31, fuel gas for torch ignition passes through the gas supply pipe 11 and the pressure is set by the gas pressure control device 12 to the set pressure. Then, the gas enters the gas chamber 9 via the gas passage 10 in the metal fitting 6 above the shaft chamber. The torch ignition fuel gas flows into the sub-combustion chamber 1 when the sub-chamber valve 5 is opened by an opening / closing signal from a valve opening / closing control device (not shown) based on the rotation of a crankshaft (not shown). I do.
【００２０】一方、前記主燃焼室２内には高効率、低Ｎ
Ｏｘの燃焼を実現するため、燃料量が希薄状態の燃料と
空気との混合気が吸気弁（図示省略）を経て吸入され
る。そして、エンジンの回転に連動した点火装置（図示
省略）により前記点火プラグ７に高電圧が付与される
と、点火プラグ７からの火花放電により副燃焼室１内の
トーチ点火用燃料ガスが着火、燃焼する。この着火がな
されたトーチ点火用燃料ガスは燃焼トーチとして、横向
噴孔３１からシリンダ軸線３５の下方向に対して９０°
の開き角度α１を有して主燃焼室に噴出される。このよ
うな大きな開き角度を有して燃焼トーチを噴出するの
で、その燃焼トーチは、主燃焼室の外周近傍に大きく拡
散して、未燃ガスが発生していた主燃焼室外周部の混合
気をも充分に燃焼させることができる。On the other hand, high efficiency and low N
In order to realize the combustion of Ox, a mixture of fuel and air in a fuel-lean state is sucked through an intake valve (not shown). When a high voltage is applied to the ignition plug 7 by an ignition device (not shown) linked to the rotation of the engine, the torch ignition fuel gas in the sub-combustion chamber 1 is ignited by spark discharge from the ignition plug 7, Burn. The ignited torch ignition fuel gas is used as a combustion torch as a combustion torch at 90 ° with respect to the downward direction of the cylinder axis 35 from the horizontal injection hole 31.
And is injected into the main combustion chamber with an opening angle α1. Since the combustion torch is ejected with such a large opening angle, the combustion torch is greatly diffused in the vicinity of the outer periphery of the main combustion chamber, and the air-fuel mixture at the outer periphery of the main combustion chamber where unburned gas is generated. Can also be sufficiently burned.
【００２１】また、このような横向噴孔を有するトーチ
点火式エンジンにおいては、図４及び図５に示す従来の
トーチ点火式エンジンに対して、未燃ガスを５００ｐｐ
ｍ程度低下させることができ、熱効率を０．５％程度向
上させることができる。Further, in the torch ignition type engine having such a horizontal injection hole, the unburned gas is reduced by 500 pp compared with the conventional torch ignition type engine shown in FIGS.
m, and the thermal efficiency can be improved by about 0.5%.
【００２２】〔別実施の形態〕次に、本発明のトーチ点
火式エンジンの別の実施の形態を図面に基づいて説明す
る。[Other Embodiment] Next, another embodiment of the torch ignition type engine of the present invention will be described with reference to the drawings.
【００２３】〈１〉 上記の実施の形態において、大噴
孔３１ａ及び小噴孔３１の夫々の噴孔軸線３３ａ，３３
ｂとシリンダ軸線３５の交点がすべて一致している構成
を示したが、別に、小噴孔３１ｂの噴孔軸線３３ｂとシ
リンダ軸線３５の交点を、大小噴孔３１ａの噴孔軸線３
３ａとシリンダ軸線３５の交点よりも上方になるように
構成することもできる。この場合、小噴孔３１ｂの噴孔
軸線３３ｂの開き角度を、大噴孔３１ａの噴孔軸線３３
ａの開き角度よりも大きく設定し、燃焼室の中心部から
外周部にわたって全体的に燃焼トーチを噴出して、主燃
焼室の混合気を燃焼させることが好ましい。<1> In the above embodiment, the injection hole axes 33a, 33 of the large injection holes 31a and the small injection holes 31, respectively.
Although the configuration in which the intersections of the b and the cylinder axis 35 are all the same is shown, separately, the intersection of the injection hole axis 33b of the small injection hole 31b and the cylinder axis 35 is defined by the injection hole axis 3 of the large and small injection hole 31a.
It may be configured to be higher than the intersection of 3a and the cylinder axis 35. In this case, the opening angle of the injection hole axis 33b of the small injection hole 31b is set to the injection hole axis 33 of the large injection hole 31a.
It is preferable that the opening angle is set to be larger than the opening angle of a, and the combustion torch is ejected from the center to the outer periphery of the combustion chamber as a whole to burn the air-fuel mixture in the main combustion chamber.
【００２４】〈２〉 上記の実施の形態において、横向
噴孔３１として、断面形状が円形の噴孔として構成した
ものを説明したが、別に、断面形状が四角径のスリット
として横向噴孔を構成することもできる。この場合、副
室口金４のほぼ外周全体にわたってスリットを設けて、
そのスリットを横向噴孔として、燃焼トーチを噴出させ
るように構成することができる。<2> In the above-described embodiment, the horizontal injection hole 31 has been described as having a circular cross-sectional shape as the injection hole. Alternatively, the horizontal injection hole is configured as a slit having a square cross-sectional shape. You can also. In this case, a slit is provided over almost the entire outer periphery of the sub chamber base 4,
The slit can be configured as a horizontal injection hole to eject the combustion torch.
【００２５】〈３〉 上記の実施の形態において、燃焼
トーチを主燃焼室に噴出させる噴孔のすべてを、本発明
の特徴構成である横向噴孔として構成した例を説明した
が、別に、従来と同様の開き角度が６０°等の噴孔と、
本発明の特徴構成の横向噴孔を組み合わせて、本発明の
トーチ点火式エンジンを構成することができる。<3> In the above embodiment, an example in which all the injection holes for injecting the combustion torch into the main combustion chamber are configured as horizontal injection holes which is a characteristic configuration of the present invention has been described. An injection hole with the same opening angle as 60 ° and the like,
The torch ignition type engine of the present invention can be configured by combining the horizontal injection holes having the characteristic configuration of the present invention.
【００２６】〈４〉 上記の実施の形態において、本発
明のトーチ点火式ガスエンジンとして、燃料として天然
ガス系都市ガスを利用したガスエンジンについて説明し
たが、他に利用できる燃料としては、ガソリン、プロパ
ン、メタノール、水素、軽油等、任意の炭化水素系燃料
を揚げることができる。<4> In the above embodiment, a gas engine using a natural gas-based city gas as a fuel has been described as the torch ignition type gas engine of the present invention. Any hydrocarbon fuel such as propane, methanol, hydrogen, light oil, etc. can be fried.
【図１】本発明に係るトーチ点火式エンジンの燃焼室及
び燃料供給系を示す要部断面図FIG. 1 is a sectional view of a main part showing a combustion chamber and a fuel supply system of a torch ignition type engine according to the present invention.
【図２】図１に示す本発明に係るトーチ点火式エンジン
の噴孔の配置構造図FIG. 2 is a structural view showing the arrangement of injection holes of the torch ignition type engine according to the present invention shown in FIG. 1;
【図３】図１に示す本発明に係るトーチ点火式エンジン
の噴孔の平面配置図FIG. 3 is a plan view of the injection holes of the torch ignition type engine according to the present invention shown in FIG. 1;
【図４】従来のトーチ点火式エンジンの燃焼室及び燃料
供給系を示す要部断面図FIG. 4 is a sectional view of a main part showing a combustion chamber and a fuel supply system of a conventional torch ignition type engine.
【図５】図４に示す従来のトーチ点火式エンジンの噴孔
の配置構造図FIG. 5 is a diagram showing the arrangement of injection holes in the conventional torch ignition type engine shown in FIG.
１ 副燃焼室 ２ 主燃焼室 ４ 副室口金 ５ 副室弁 ６ 副室上部金物 ７ 点火プラグ ８ シリンダヘッド ９ ガスチャンバ １０ ガス通路 １４ ピストン １４ａ ピストンの触火面 ３１ 横向噴孔 ３１ａ 大噴孔 ３１ｂ 小噴孔 ３３ 噴孔軸線 ３３ａ 大噴孔の軸線 ３３ｂ 小噴孔の軸線 ３５ シリンダ軸線 DESCRIPTION OF SYMBOLS 1 Sub-combustion chamber 2 Main combustion chamber 4 Sub-chamber base 5 Sub-chamber valve 6 Sub-chamber upper hardware 7 Ignition plug 8 Cylinder head 9 Gas chamber 10 Gas passage 14 Piston 14a Piston ignition surface 31 Lateral injection hole 31a Large injection hole 31b Small orifice 33 Injector axis 33a Large orifice 33b Small orifice 35 Cylinder axis
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｆ０２Ｍ 21/02 Ｆ０２Ｍ 21/02 Ｓ (72)発明者 伊藤 誠一 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 足立 伸一 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 遠藤 浩之 長崎県長崎市深堀町五丁目717番１号 三 菱重工業株式会社長崎研究所内 (72)発明者 角濱 義隆 神奈川県相模原市田名3000番地 三菱重工 業株式会社相模原製作所内 Ｆターム(参考） 3G023 AA02 AA03 AB01 AC03 AD03 AD12 AD23 AD27 AD28 AD29──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) F02M 21/02 F02M 21/02 S (72) Inventor Seiichi Ito 4-chome, Hirano-cho, Chuo-ku, Osaka-shi, Osaka No. 2 Osaka Gas Co., Ltd. (72) Shinichi Adachi 4-1-2 Hirano-cho, Chuo-ku, Osaka City, Osaka Prefecture Osaka Gas Co., Ltd. (72) Inventor Hiroyuki Endo 5-717 Fukabori-cho, Nagasaki City, Nagasaki Prefecture No. 1 In the Nagasaki Research Laboratory of Mitsubishi Heavy Industries, Ltd. (72) Inventor Yoshitaka Kadohama 3000 Tana, Sagamihara-shi, Kanagawa Prefecture F-term in the Sagamihara Works of Mitsubishi Heavy Industries, Ltd. F-term (reference) AD29
Claims (3)
トーチ点火用燃料を導き、点火プラグにより該トーチ点
火用燃料に着火し、燃料トーチを前記シリンダヘッドに
設けられた副室口金の複数の噴孔から主燃焼室内の混合
気中に噴出させて、該混合気を燃焼させるトーチ点火式
エンジンであって、 前記複数の噴孔が、シリンダ軸線下方向に対する噴孔軸
線の開き角度が８５°〜１２０°の範囲内に設定された
横向噴孔を有して構成されているトーチ点火式エンジ
ン。1. A fuel for torch ignition is guided to a sub-combustion chamber provided in a cylinder head, the torch ignition fuel is ignited by a spark plug, and a plurality of fuel torches are provided to a sub-chamber base provided in the cylinder head. What is claimed is: 1. A torch-ignition engine for injecting an air-fuel mixture from an injection hole into a main combustion chamber to burn the air-fuel mixture, wherein the plurality of injection holes have an opening angle of an injection hole axis with respect to a cylinder axis downward direction of 85 °. A torch-ignition engine having a horizontal injection hole set within a range of up to 120 °.
で、前記シリンダヘッドの下面から上死点時のピストン
の上面までの１／３〜２／３の範囲内の位置に設けられ
ている請求項１に記載のトーチ点火式エンジン。2. The horizontal injection hole is provided at a position within the range of 1/3 to 2/3 from the lower surface of the cylinder head to the upper surface of the piston at the top dead center on the axis of the sub-chamber base. The torch-ignition engine according to claim 1, wherein:
央部に設けられ、前記横向噴孔が前記副室口金の外周に
おいて周方向等間隔に配設されている請求項１または２
に記載のトーチ点火式エンジン。3. The sub-chamber base is provided at a central portion of the cylinder head, and the lateral injection holes are arranged at equal circumferential intervals on an outer periphery of the sub-chamber base.
A torch-ignition engine according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000079944A JP4368028B2 (en) | 2000-03-22 | 2000-03-22 | Torch ignition engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000079944A JP4368028B2 (en) | 2000-03-22 | 2000-03-22 | Torch ignition engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001263069A true JP2001263069A (en) | 2001-09-26 |
| JP4368028B2 JP4368028B2 (en) | 2009-11-18 |
Family
ID=18597118
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000079944A Expired - Fee Related JP4368028B2 (en) | 2000-03-22 | 2000-03-22 | Torch ignition engine |
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| JP2008286143A (en) * | 2007-05-18 | 2008-11-27 | Mitsubishi Heavy Ind Ltd | Piston for auxiliary chamber type gas engine |
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| CN108691635A (en) * | 2017-03-31 | 2018-10-23 | 本田技研工业株式会社 | Internal combustion engine |
| US20190323416A1 (en) * | 2016-12-08 | 2019-10-24 | Mitsubishi Heavy Industries Engine & Turbocharger, Ltd. | Precombustion chamber gas engine |
| EP3901435A3 (en) * | 2020-04-23 | 2021-11-24 | Liebherr Machines Bulle SA | Engine with pre-chamber ignition and method for controlling such an engine |
| US11415041B2 (en) * | 2019-09-16 | 2022-08-16 | Woodward, Inc. | Flame triggered and controlled volumetric ignition |
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