JP3372399B2 - Secondary combustion chamber structure of methanol engine - Google Patents
Secondary combustion chamber structure of methanol engineInfo
- Publication number
- JP3372399B2 JP3372399B2 JP18090695A JP18090695A JP3372399B2 JP 3372399 B2 JP3372399 B2 JP 3372399B2 JP 18090695 A JP18090695 A JP 18090695A JP 18090695 A JP18090695 A JP 18090695A JP 3372399 B2 JP3372399 B2 JP 3372399B2
- Authority
- JP
- Japan
- Prior art keywords
- sub
- combustion chamber
- chamber
- fuel
- main
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
-
- 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
Landscapes
- Combustion Methods Of Internal-Combustion Engines (AREA)
- Fuel-Injection Apparatus (AREA)
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明はメタノールエンジンの副
燃焼室構造に関する。
【０００２】
【従来の技術】図５は従来形のメタノールエンジンの燃
焼室回りの構成説明図である。図５を参照してその構成
について説明する。主燃焼室６はシリンダの上部とピス
トン７の頂部と排気弁９が配設されているシリンダヘッ
ド８の内面で囲まれる空間で形成され、該シリンダヘッ
ド８には主燃料弁２が上方から装着され、副燃焼室（以
降、副室と略す）３が側方からシリンダの軸線に対して
対称に一対となって装着されている。なお、前記副室３
には、単噴口の副燃料弁１とグロープラグ３ｇが装着さ
れ、副室の噴口３ｈは副室３の中心から上方にずらして
開口され主燃焼室６と副室３とを連通している。
【０００３】次にその作用について説明する。圧縮行程
でピストン７がシリンダ内を上昇し圧力が上昇すると、
主燃焼室６から副室の噴口３ｈを通って高速の空気流が
副室３内に流入し、該副室内に旋回流が形成される。該
旋回流に向けて副燃料弁１からメタノールを噴射する
と、噴霧はグロープラグ３ｇによって着火されて燃焼
し、高圧の燃焼ガスが副室の噴口３ｈから主燃焼室６に
噴出する。この燃焼ガスの噴流が主燃料弁２から主燃焼
室６内に噴射されたメタノールの主噴霧に着火し主燃焼
室６内での燃焼が起る。
【０００４】
【発明が解決しようとする課題】メタノールのオクタン
価は１０６（リサーチ法）と高いがセタン価は３と極め
て低いので、メタノールエンジンでは燃焼室へのグロー
プラグの装着など強制着火の手段が必要とされる。ま
た、大形メタノールエンジンにおいて副燃焼室方式が採
用されるのは、副室では安定した着火が比較的容易であ
り、副室噴口から噴出する燃焼ガスが主燃焼室内に噴射
されるメタノールの主噴霧に着火し燃焼させるからであ
る。
【０００５】しかしながら、図５に示した従来例のよう
な構成の場合、副室３内に強い旋回流が生成されるとグ
ロープラグ３ｇによる着火がむずかしくなり、着火の安
定性がそこなわれる。着火の安定を図るためグロープラ
グ３ｇに加える電圧を高くすると、グロープラグ３ｇの
耐久性が低下する。なお、副室３への噴霧燃料の燃焼ガ
スは、副室の噴口３ｈで絞られて噴出するため絞りによ
る損失があり、熱効率の改善を図る際の妨げとなるなど
の問題点がある。
【０００６】本発明の目的は前記問題点を解決し、始動
時や低負荷時においても、副室内で噴射された燃料噴霧
と流動空気とが良く混合しグロープラグで確実に着火
し、副室の噴口から主燃焼室に噴出するパイロット燃焼
ガスによって主燃焼室内に噴射された主燃料噴霧に確実
に着火し、良好且つ安定した燃焼が得られるメタノール
エンジンの副燃焼室構造を提供するにある。
【０００７】
【課題を解決するための手段】本発明のメタノールエン
ジンの副燃焼室構造は、主燃焼室６への燃料噴射がサイ
ドインジェクション方式で、且つ副燃焼室３を有するメ
タノールエンジンにおいて、副燃焼室３に装着する副燃
料弁１のノズル１ｎと前記副燃焼室の噴口３ｈの中心を
結び主燃焼室６側へ延長した直線Ｆと、主燃料弁２の多
噴口ノズル２ｎからの複数の燃料噴霧の中心線２ａ，２
ｂ，２ｃが主燃焼室６内で交差するように主燃料弁２と
副燃焼室３を配置するとともに、該副燃焼室の断面形状
において、副燃料弁ノズル１ｎから燃料が噴射される穴
部ｂ1 と、該穴部に続いて燃料噴霧の先端部近傍にグロ
ープラグ３ｇが装着される穴部側拡大部ｂ2 と、該穴部
側拡大部に続く滑かな凸曲面の中間狭隘部ｂ3 と、該中
間狭隘部と前記副燃焼室の噴口３ｈの間の噴口側拡大部
ｂ4 とを滑らかに接続した形状としてなることを特徴と
している。
【０００８】
【作用】圧縮行程で主燃焼室６からの圧縮空気が副室の
噴口３ｈを通って副室３内に流入し、該副室内の穴部側
拡大部ｂ2 の外周部に渦流Ｖが生成される。副室の噴口
３ｈからの流入空気に向って副燃料弁１からメタノール
を噴射すると、広がった燃料噴霧の外周部は空気流動に
よる渦流Ｖの中にまき込まれていく。前記穴部側拡大部
ｂ2 に渦流に接触するように装着されているグロープラ
グ３ｇで燃料噴霧に着火すると、穴部側拡大部では渦流
Ｖの流速が緩やかで、且つグロープラグ３ｇ近傍にメタ
ノールの噴霧が滞留するので副室３内で安定した着火が
得られる。
【０００９】副室３内の燃焼で高圧となった燃焼ガスは
副室３から副室の噴口３ｈを通り主燃焼室６へ噴出す
る。主燃料弁２の多噴口ノズル２ｎから噴射される複数
個の燃料噴霧の中心線２ａ，２ｂ，２ｃと、前記副燃料
弁ノズル１ｎと副室の噴口３ｈの中心を結び主燃焼室６
側へ延長した直線Ｆが主燃焼室６内で交差するように構
成されているので、主燃料弁２の多噴口ノズル２ｎから
噴射された全燃料噴霧に副室の噴口３ｈから噴出した燃
焼ガスが接触することになり、主燃焼室６内で燃料噴霧
へ的確に着火し安定した良好な燃焼が得られる。
【００１０】
【実施例】図１は本発明の実施例に係るメタノールエン
ジンの燃焼室回りの構成説明図である。図１を参照して
その構成について説明する。主燃焼室６はシリンダの上
部とピストン７の頂部と排気弁９が配設されているシリ
ンダヘッド８の内面によって囲まれる空間で形成され、
シリンダヘッド８には主燃料弁２が上方から装着され、
副室３が側方からシリンダの軸線に対して対称に一対と
なって装着されている。副室３には単噴口の副燃料弁１
とグロープラグ３ｇが装着され、副燃料弁１には燃料ポ
ンプ５から、主燃料弁２には燃料ポンプ４からそれぞれ
メタノールが圧送される。
【００１１】副室の噴口３ｈは、副燃料弁１のノズル１
ｎと副室の噴口３ｈの中心を結ぶ直線の主燃焼室側への
延長線Ｆと、主燃料弁２の多噴口ノズル２ｎから噴射さ
れる複数個の燃料噴霧の中心線２ａ，２ｂ，２ｃが主燃
焼室６内で交差するように位置決めされ、主燃焼室６と
副室３とを連通している。
【００１２】副室３内の空間の断面形状は図２に示すよ
うに形成されている。副燃料弁ノズル１ｎから燃料が噴
射される穴部ｂ1 と、該穴部に続いて燃料噴霧の先端部
近傍に穴部側拡大部ｂ2 が形成され、該穴部側拡大部と
副室の噴口３ｈとの間に噴口側拡大部ｂ4 が設けられ、
前記二つの拡大部の間が滑かな凸曲面の中間狭隘部ｂ3
で接続されている。
【００１３】図２、図３は副室３の縦断面図で、図２に
は副室３内での空気流動が、図３には副室３内での燃料
噴霧の挙動が示されている。次にこれらの図を参照して
実施例の作用について説明する。圧縮行程で主燃焼室６
からの圧縮空気が副室の噴口３ｈを通って副室３内に流
入し、該副室内の穴部側拡大部ｂ2 の外周部に渦流Ｖが
生成される。副室の噴口３ｈからの流入空気に向って副
燃料弁１からメタノールを噴射すると、広がった燃料噴
霧の外周部は空気流動による渦流Ｖの中にまき込まれて
いく。前記穴部側拡大部ｂ2 に渦流に接触するように装
着されているグロープラグ３ｇで燃料噴霧に着火する
と、穴部側拡大部では渦流Ｖの流速が緩やかで、且つグ
ロープラグ３ｇ近傍にメタノールの噴霧が滞留するので
副室３内で安定した着火が得られる。
【００１４】図４は主燃焼室６内における燃料噴霧の方
向の説明図である。副室３内の燃焼で高圧となった燃焼
ガスは副室３から副室の噴口３ｈを通り主燃焼室６へ噴
出する。主燃料弁２の多噴口ノズル２ｎから噴射される
複数個の燃料噴霧の中心線２ａ，２ｂ，２ｃと、前記副
燃料弁ノズル１ｎと副室の噴口３ｈの中心を結び主燃焼
室６側へ延長した直線Ｆが主燃焼室６内で交差するよう
に構成されているので、主燃料弁ノズル２ｎから噴射さ
れた燃料噴霧に副室の噴口３ｈから噴出した燃焼ガスが
接触することになり、主燃焼室６内で燃料噴霧へ的確に
着火し安定した良好な燃焼が得られる。
【００１５】
【発明の効果】副室内に噴射された燃料噴霧と、主燃焼
室から副室へ流入した空気とが良く混合し、グロープラ
グ近傍では空気流速が緩やかで燃料噴霧が長く滞留する
から副室内での着火が確実となる。さらに、副室噴口か
ら主燃料室へ噴出するパイロット燃焼ガスが主燃焼室内
に噴射された複数個の燃料噴霧と交差することになるの
で、主燃焼室内の燃料噴霧への着火が的確に行われ、安
定した良好な燃焼が得られる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sub-combustion chamber structure of a methanol engine. 2. Description of the Related Art FIG. 5 is an explanatory view of a structure around a combustion chamber of a conventional methanol engine. The configuration will be described with reference to FIG. The main combustion chamber 6 is formed by a space surrounded by an upper surface of a cylinder, a top of a piston 7, and an inner surface of a cylinder head 8 in which an exhaust valve 9 is disposed. The main fuel valve 2 is mounted on the cylinder head 8 from above. A pair of sub-combustion chambers (hereinafter, abbreviated as sub-chambers) 3 are mounted symmetrically from the side with respect to the axis of the cylinder. The sub-chamber 3
The sub-fuel valve 1 and the glow plug 3g of the single injection port are attached to the, the injection port 3h of the sub-chamber is opened to be shifted upward from the center of the sub-chamber 3, and communicates the main combustion chamber 6 and the sub-chamber 3. . Next, the operation will be described. When the piston 7 rises in the cylinder during the compression stroke and the pressure rises,
A high-speed air flow flows from the main combustion chamber 6 through the injection port 3h of the sub chamber into the sub chamber 3, and a swirling flow is formed in the sub chamber. When methanol is injected from the sub fuel valve 1 toward the swirling flow, the spray is ignited by the glow plug 3 g and burns, and high-pressure combustion gas is blown out from the injection port 3 h of the sub chamber into the main combustion chamber 6. The jet of the combustion gas ignites the main spray of methanol injected into the main combustion chamber 6 from the main fuel valve 2 and combustion in the main combustion chamber 6 occurs. [0004] The octane number of methanol is as high as 106 (research method), but the cetane number is as extremely low as 3, so that in a methanol engine, means for forced ignition such as mounting a glow plug in a combustion chamber is required. Needed. Also, the reason why the auxiliary combustion chamber system is adopted in the large methanol engine is that stable ignition is relatively easy in the auxiliary chamber, and the combustion gas ejected from the injection port of the auxiliary chamber is the main fuel of methanol injected into the main combustion chamber. This is because the spray is ignited and burned. [0005] However, in the case of the configuration as in the conventional example shown in FIG. 5, if a strong swirling flow is generated in the sub-chamber 3, ignition by the glow plug 3g becomes difficult, and ignition stability is impaired. If the voltage applied to the glow plug 3g is increased in order to stabilize the ignition, the durability of the glow plug 3g decreases. Note that the combustion gas of the fuel sprayed into the sub-chamber 3 is throttled and ejected at the injection port 3h of the sub-chamber, so that there is a problem that there is a loss due to the throttling, which hinders the improvement of the thermal efficiency. SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and even at the time of starting or at a low load, the fuel spray injected in the sub-chamber and the flowing air are mixed well and ignited reliably by the glow plug. Another object of the present invention is to provide a sub-combustion chamber structure of a methanol engine in which the main fuel spray injected into the main combustion chamber is reliably ignited by pilot combustion gas injected from the injection port into the main combustion chamber, and good and stable combustion can be obtained. [0007] The structure of the auxiliary combustion chamber of the methanol engine according to the present invention is the same as that of the above, except that the fuel injection into the main combustion chamber 6 is performed by the side injection system and the auxiliary combustion chamber 3 has the auxiliary combustion chamber. A straight line F extending from the nozzle 1n of the auxiliary fuel valve 1 attached to the combustion chamber 3 to the center of the injection port 3h of the auxiliary combustion chamber toward the main combustion chamber 6 and a plurality of nozzles 2n from the multi-injection nozzle 2n of the main fuel valve 2 Center lines 2a, 2 of fuel spray
The main fuel valve 2 and the sub-combustion chamber 3 are arranged so that b and 2c intersect in the main combustion chamber 6, and in the cross-sectional shape of the sub-combustion chamber, a hole through which fuel is injected from the sub-fuel valve nozzle 1n b1, a hole-side enlarged portion b2 in which the glow plug 3g is mounted near the tip of the fuel spray following the hole, and a middle narrow portion b3 of a smooth convex curved surface following the hole-side enlarged portion. It is characterized in that the intermediate narrow portion and the orifice-side enlarged portion b4 between the orifice 3h of the sub-combustion chamber are smoothly connected. In the compression stroke, compressed air from the main combustion chamber 6 flows into the sub-chamber 3 through the injection port 3h of the sub-chamber, and the vortex V flows to the outer periphery of the hole-side enlarged portion b2 in the sub-chamber. Is generated. When methanol is injected from the auxiliary fuel valve 1 toward the inflow air from the injection port 3h of the auxiliary chamber, the outer peripheral portion of the expanded fuel spray is swirled into the vortex V due to the air flow. When the fuel spray is ignited by the glow plug 3g attached to the hole-side enlarged portion b2 so as to come into contact with the vortex, the flow velocity of the vortex V is slow at the hole-side enlarged portion, and methanol flows near the glow plug 3g. Since the spray stays, stable ignition can be obtained in the sub-chamber 3. The combustion gas which has become high pressure by the combustion in the sub-chamber 3 is discharged from the sub-chamber 3 to the main combustion chamber 6 through the injection port 3h of the sub-chamber. The center line 2a, 2b, 2c of a plurality of fuel sprays injected from the multi-injection nozzle 2n of the main fuel valve 2 is connected to the center of the sub fuel valve nozzle 1n and the injection port 3h of the sub chamber, and the main combustion chamber 6 is connected.
Since the straight line F extending to the side intersects inside the main combustion chamber 6, the combustion gas injected from the injection port 3h of the sub chamber into the entire fuel spray injected from the multi-injection nozzle 2n of the main fuel valve 2 Comes into contact with each other, and the fuel spray is ignited accurately in the main combustion chamber 6 to obtain stable and good combustion. FIG. 1 is an explanatory view of a configuration around a combustion chamber of a methanol engine according to an embodiment of the present invention. The configuration will be described with reference to FIG. The main combustion chamber 6 is formed by a space surrounded by an upper surface of a cylinder, a top of a piston 7, and an inner surface of a cylinder head 8 in which an exhaust valve 9 is provided.
The main fuel valve 2 is mounted on the cylinder head 8 from above,
The sub chambers 3 are mounted as a pair symmetrically with respect to the cylinder axis from the side. The sub-chamber 3 has a single injection port sub fuel valve 1
And a glow plug 3g, and methanol is pumped from the fuel pump 5 to the sub fuel valve 1 and from the fuel pump 4 to the main fuel valve 2, respectively. The nozzle 3h of the auxiliary fuel valve 1 is
n and a center line 2a, 2b, 2c of a plurality of fuel sprays injected from the multi-injection nozzle 2n of the main fuel valve 2; Are positioned so as to intersect in the main combustion chamber 6 and communicate the main combustion chamber 6 and the sub chamber 3. The sectional shape of the space in the sub-chamber 3 is formed as shown in FIG. A hole b1 through which fuel is injected from the auxiliary fuel valve nozzle 1n, and a hole-side enlarged portion b2 are formed near the tip of the fuel spray following the hole, and the hole-side enlarged portion and the injection port of the sub chamber are formed. 3h, a nozzle-side enlarged portion b4 is provided.
An intermediate narrow portion b3 of a convex curved surface between the two enlarged portions.
Connected by 2 and 3 are longitudinal sectional views of the sub-chamber 3. FIG. 2 shows the air flow in the sub-chamber 3, and FIG. 3 shows the behavior of the fuel spray in the sub-chamber 3. I have. Next, the operation of the embodiment will be described with reference to these drawings. The main combustion chamber 6 during the compression stroke
Compressed air flows into the sub-chamber 3 through the injection port 3h of the sub-chamber, and a vortex V is generated on the outer peripheral portion of the hole-side enlarged portion b2 in the sub-chamber. When methanol is injected from the auxiliary fuel valve 1 toward the inflow air from the injection port 3h of the auxiliary chamber, the outer peripheral portion of the expanded fuel spray is swirled into the vortex V due to the air flow. When the fuel spray is ignited by the glow plug 3g attached to the hole-side enlarged portion b2 so as to come into contact with the vortex, the flow velocity of the vortex V is slow at the hole-side enlarged portion, and methanol flows near the glow plug 3g. Since the spray stays, stable ignition can be obtained in the sub-chamber 3. FIG. 4 is an explanatory view of the direction of the fuel spray in the main combustion chamber 6. The combustion gas which has become high pressure by the combustion in the sub-chamber 3 is discharged from the sub-chamber 3 to the main combustion chamber 6 through the injection port 3h of the sub-chamber. A center line 2a, 2b, 2c of a plurality of fuel sprays injected from the multi-injection nozzle 2n of the main fuel valve 2 is connected to the center of the sub fuel valve nozzle 1n and the injection port 3h of the sub chamber to the main combustion chamber 6 side. Since the extended straight line F is configured to intersect in the main combustion chamber 6, the combustion gas ejected from the injection port 3h of the sub chamber comes into contact with the fuel spray injected from the main fuel valve nozzle 2n, The fuel spray is accurately ignited in the main combustion chamber 6 and stable and good combustion is obtained. The fuel spray injected into the sub-chamber and the air flowing into the sub-chamber from the main combustion chamber are well mixed, and the air flow is slow near the glow plug and the fuel spray stays for a long time. Ignition in the sub-chamber is assured. Furthermore, since the pilot combustion gas ejected from the sub chamber injection port to the main fuel chamber intersects with the plurality of fuel sprays injected into the main combustion chamber, ignition of the fuel spray in the main combustion chamber is performed accurately. , Stable and good combustion can be obtained.
【図面の簡単な説明】
【図１】本発明の実施例に係るメタノールエンジンの燃
焼室回りの構成説明図。
【図２】本発明の実施例に係るメタノールエンジンの副
室内への空気流動を説明する副室の縦断面図。
【図３】本発明の実施例に係るメタノールエンジンの副
室内の燃料噴霧の挙動を説明する副室の縦断面図。
【図４】本発明の実施例に係るメタノールエンジンの主
燃焼室内における燃料噴霧の方向の説明図。
【図５】従来のメタノールエンジンの燃焼室回りの構成
説明図。
【符号の説明】
１…副燃料弁、１ｎ…副燃料弁ノズル、２…主燃料弁、
２ｎ…主燃料弁（多噴口）ノズル、２ａ，２ｂ，２ｃ…
主燃料弁から噴射された燃料噴霧の中心線、３…副室、
３ｇ…グロープラグ、３ｈ…副室の噴口、４…燃料ポン
プ（主燃料弁）、５…燃料ポンプ（副燃料弁）、６…主
燃焼室、７…ピストン、８…シリンダヘッド、９…排気
弁、Ｆ…副燃料弁のノズルと副室の噴口の中心を結び主
燃焼室側へ延長した直線、ｂ1 …副室内の穴部、ｂ2 …
副室内の穴部側拡大部、ｂ3 …副室内の中間狭隘部、ｂ
4 …副室内の噴口側拡大部。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration explanatory diagram around a combustion chamber of a methanol engine according to an embodiment of the present invention. FIG. 2 is a vertical cross-sectional view of the sub-chamber explaining the flow of air into the sub-chamber of the methanol engine according to the embodiment of the present invention. FIG. 3 is a longitudinal sectional view of a sub-chamber explaining the behavior of fuel spray in the sub-chamber of the methanol engine according to the embodiment of the present invention. FIG. 4 is an explanatory diagram of a direction of fuel spray in a main combustion chamber of the methanol engine according to the embodiment of the present invention. FIG. 5 is an explanatory view of a configuration around a combustion chamber of a conventional methanol engine. [Description of Signs] 1 ... Sub fuel valve, 1n ... Sub fuel valve nozzle, 2 ... Main fuel valve,
2n: Main fuel valve (multiple nozzle) nozzles, 2a, 2b, 2c ...
Center line of the fuel spray injected from the main fuel valve, 3 ... sub chamber,
3g glow plug, 3h injection port of sub chamber, 4 fuel pump (main fuel valve), 5 fuel pump (sub fuel valve), 6 main combustion chamber, 7 piston, 8 cylinder head, 9 exhaust Valve, F: A straight line extending from the nozzle of the auxiliary fuel valve to the center of the injection port of the auxiliary chamber and extending toward the main combustion chamber, b1 ... a hole in the auxiliary chamber, b2 ...
Enlarged part on the hole side in the sub-chamber, b3 ... middle narrow part in the sub-chamber, b
4… Expansion part on the nozzle side in the sub-chamber.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ Ｆ０２Ｍ 61/14 ３１０ Ｆ０２Ｍ 61/14 ３１０Ｐ ３１０Ｓ ３１０Ｖ Ｆ０２Ｐ 19/00 Ｆ０２Ｐ 19/00 Ａ (56)参考文献 特開 平８−93476（ＪＰ，Ａ) 特開 平７−189880（ＪＰ，Ａ) 特開 平４−301183（ＪＰ，Ａ) 特開 平７−91256（ＪＰ，Ａ) 特開 平６−173687（ＪＰ，Ａ) 実開 昭59−17220（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) F02B 19/00 - 19/18 ────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 7 identification code FI F02M 61/14 310 F02M 61/14 310P 310S 310V F02P 19/00 F02P 19/00 A (56) (JP, A) JP-A-7-189880 (JP, A) JP-A-4-301183 (JP, A) JP-A-7-91256 (JP, A) JP-A-6-173687 (JP, A) Kaisho 59-17220 (JP, U) (58) Fields investigated (Int. Cl. 7 , DB name) F02B 19/00-19/18
Claims (1)
ンジェクション方式で、且つ副燃焼室（３）を有するメ
タノールエンジンにおいて、副燃焼室（３）に装着する
副燃料弁（１）のノズル（１ｎ）と前記副燃焼室の噴口
（３ｈ）の中心を結び主燃焼室（６）側へ延長した直線
（Ｆ）と、主燃料弁（２）の多噴口ノズル（２ｎ）から
の複数の燃料噴霧の中心線（２ａ，２ｂ，２ｃ）が主燃
焼室（６）内で交差するように主燃料弁（２）と副燃焼
室（３）を配置するとともに、該副燃焼室の断面形状に
おいて、副燃料弁ノズル（１ｎ）から燃料が噴射される
穴部（ｂ1 ）と、該穴部に続いて燃料噴霧の先端部近傍
にグロープラグ（３ｇ）が装着される穴部側拡大部（ｂ
2 ）と、該穴部側拡大部に続く滑かな凸曲面の中間狭隘
部（ｂ3 ）と、該中間狭隘部と前記副燃焼室の噴口（３
ｈ）の間の噴口側拡大部（ｂ4 ）とを滑らかに接続した
形状としてなることを特徴とするメタノールエンジンの
副燃焼室構造。(57) [Claim 1] In a methanol engine having a side injection system for fuel injection into a main combustion chamber (6) and having a sub-combustion chamber (3), the fuel is injected into the sub-combustion chamber (3). A straight line (F) connecting the nozzle (1n) of the sub fuel valve (1) to be mounted and the center of the injection port (3h) of the sub combustion chamber and extending toward the main combustion chamber (6); The main fuel valve (2) and the sub-combustion chamber (3) are arranged so that the center lines (2a, 2b, 2c) of a plurality of fuel sprays from the multi-injection nozzle (2n) intersect in the main combustion chamber (6). At the same time, in the cross-sectional shape of the sub-combustion chamber, a glow plug (3g) is formed near the tip of the fuel spray following the hole (b1) where fuel is injected from the sub-fuel valve nozzle (1n). Is mounted on the hole side enlarged portion (b
2), an intermediate narrow portion (b3) of a smooth convex surface following the hole-side enlarged portion, and the intermediate narrow portion and the injection port (3) of the sub-combustion chamber.
h): a sub-combustion chamber structure of a methanol engine characterized in that the shape is smoothly connected to the nozzle-side enlarged portion (b4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18090695A JP3372399B2 (en) | 1995-05-08 | 1995-06-23 | Secondary combustion chamber structure of methanol engine |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7-132582 | 1995-05-08 | ||
| JP13258295 | 1995-05-08 | ||
| JP18090695A JP3372399B2 (en) | 1995-05-08 | 1995-06-23 | Secondary combustion chamber structure of methanol engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0925823A JPH0925823A (en) | 1997-01-28 |
| JP3372399B2 true JP3372399B2 (en) | 2003-02-04 |
Family
ID=26467124
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18090695A Expired - Fee Related JP3372399B2 (en) | 1995-05-08 | 1995-06-23 | Secondary combustion chamber structure of methanol engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3372399B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105275583A (en) * | 2014-07-23 | 2016-01-27 | 现代自动车美国技术研究所 | Dual pre-chamber combustion system |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19741566B4 (en) * | 1997-09-20 | 2006-06-08 | Man B & W Diesel Ag | reciprocating engine |
| WO1999066186A1 (en) * | 1998-06-18 | 1999-12-23 | Fev Motorentechnik Gmbh | Method for igniting a multi-cylinder reciprocating gas engine by injecting an ignition gas |
| US6298825B1 (en) | 1998-11-27 | 2001-10-09 | Fev Motorentechnik Gmbh | Method for igniting a multi-cylinder reciprocating gas engine by injecting an ignition gas |
| CN117028016B (en) * | 2023-10-09 | 2024-01-12 | 潍柴动力股份有限公司 | In-cylinder direct injection methanol engine and combustion chamber thereof and combustion chamber parameter determining method |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5917220U (en) * | 1982-07-26 | 1984-02-02 | 三菱自動車工業株式会社 | Pre-combustion chamber with multiple glow plugs |
| JP2778846B2 (en) * | 1991-03-28 | 1998-07-23 | 三菱重工業株式会社 | Methanol engine |
| JPH06173687A (en) * | 1992-06-23 | 1994-06-21 | Sekiyu Sangyo Kasseika Center | Combustion chamber having subchamber of internal combustion engine |
| JPH0791256A (en) * | 1993-09-24 | 1995-04-04 | Kubota Corp | Fuel injection device for spark ignition engine incorporating counter combustion chamber type |
| JP3160455B2 (en) * | 1993-12-28 | 2001-04-25 | 三菱重工業株式会社 | Large side injection methanol engine |
| JP3364023B2 (en) * | 1994-09-20 | 2003-01-08 | 三菱重工業株式会社 | Large low-speed two-cycle methanol engine |
-
1995
- 1995-06-23 JP JP18090695A patent/JP3372399B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105275583A (en) * | 2014-07-23 | 2016-01-27 | 现代自动车美国技术研究所 | Dual pre-chamber combustion system |
| CN105275583B (en) * | 2014-07-23 | 2019-06-04 | 现代自动车美国技术研究所 | Double precombustion chamber combustion systems |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0925823A (en) | 1997-01-28 |
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