JP5118085B2 - engine - Google Patents

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JP5118085B2
JP5118085B2 JP2009048002A JP2009048002A JP5118085B2 JP 5118085 B2 JP5118085 B2 JP 5118085B2 JP 2009048002 A JP2009048002 A JP 2009048002A JP 2009048002 A JP2009048002 A JP 2009048002A JP 5118085 B2 JP5118085 B2 JP 5118085B2
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combustion chamber
fuel gas
chamber
engine
precombustion
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JP2009257320A (en
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インゴ・ウィルケ
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エムアーエヌ・ディーゼル・エスエー
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    • 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
    • F02B19/00—Engines characterised by precombustion chambers
    • F02B19/16—Chamber shapes or constructions not specific to sub-groups F02B19/02 - F02B19/10
    • F02B19/18—Transfer passages between chamber and cylinder
    • 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
    • F02B19/00—Engines characterised by precombustion chambers
    • F02B19/12—Engines characterised by precombustion chambers with positive ignition
    • 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
    • F02B19/00—Engines characterised by precombustion chambers
    • F02B19/16—Chamber shapes or constructions not specific to sub-groups F02B19/02 - F02B19/10
    • 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
    • F02B43/00—Engines characterised by operating on gaseous fuels; Plants including such engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/0248—Injectors
    • F02M21/0275—Injectors for in-cylinder direct injection, e.g. injector combined with spark plug
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Fuel-Injection Apparatus (AREA)

Description

本発明は請求項１もしくは請求項６のおいて書き部分に記載のエンジンに関する。   The present invention relates to an engine according to claim 1 or claim 6.

特許文献１からは、ガス状燃料のためのエンジンで、主燃焼室と当該主燃焼室から分離された予燃焼室とを含むエンジンが知られている。予燃焼室は、少なくとも１つの開口部を介して、主燃焼室と連通されている。燃料ガスを高圧下で予燃焼室内に噴射するために、予燃焼室には圧力−燃料ガス導管に接続された燃料ガスノズルの噴射方向が向けられている。このとき前記燃料ガスは、予燃焼室内に存在する希薄な燃料ガス・空気混合気と混合され、当該燃料ガス・空気混合気の濃度を増大させる。予燃焼室内には点火装置が突出しており、当該点火装置は、濃度が増大した前記燃料ガス・空気混合気を点火し、最終的には主燃焼室内の燃料ガス・空気混合気の点火を行う。   From Patent Document 1, an engine for gaseous fuel is known that includes a main combustion chamber and a pre-combustion chamber separated from the main combustion chamber. The precombustion chamber is in communication with the main combustion chamber through at least one opening. In order to inject fuel gas into the precombustion chamber under high pressure, the injection direction of the fuel gas nozzle connected to the pressure-fuel gas conduit is directed to the precombustion chamber. At this time, the fuel gas is mixed with the lean fuel gas / air mixture present in the pre-combustion chamber to increase the concentration of the fuel gas / air mixture. An ignition device protrudes into the precombustion chamber, and the ignition device ignites the fuel gas / air mixture whose concentration has increased, and finally ignites the fuel gas / air mixture in the main combustion chamber. .

独国特許出願公開第１０２１７９９６号明細書German Patent Application Publication No. 10217996

予燃焼室の圧力が高い場合に、電気的火花点火で予燃焼室内の燃料ガス・空気混合気に点火するためには、高い電気的負荷を印加しなければならないが、当該電気的高負荷は、点火装置に高い熱と電気とを負荷することになる。したがって、予燃焼室の圧力が増大すると、点火装置には多大な摩耗が生じることになり、当該摩耗によって、点火装置の耐用期間は明らかに短縮され、最終的には、エンジンの保守整備間隔の短縮に帰着する。それゆえ、保守整備間隔を長くとることが可能なエンジンが必要とされている。   In order to ignite the fuel gas / air mixture in the pre-combustion chamber by electric spark ignition when the pressure in the pre-combustion chamber is high, a high electric load must be applied. The igniter is loaded with high heat and electricity. Therefore, as the precombustion chamber pressure increases, the igniter will experience significant wear, which will obviously shorten the useful life of the igniter and ultimately reduce the engine maintenance interval. Result in shortening. Therefore, there is a need for an engine that can take a long maintenance interval.

上記の点に鑑み、本発明の課題は新式のエンジンを提供することにある。   In view of the above, it is an object of the present invention to provide a new type engine.

本発明の第一の態様によれば、本課題は請求項１に記載のエンジンによって解決される。当該エンジンでは、主燃焼室を予燃焼室と連通させる前記単独のまたは各開口部は、予燃焼室の接線方向に概ね延在しており、それによって、主燃焼室から予燃焼室へ流入する希薄な燃料ガス・空気混合気は、予燃焼室の渦流の作用を受ける。
ここで、「予燃焼室の接線方向」とは、予燃焼室から主燃焼室への移行部分に関して斜めの方向、すなわち予燃焼室の軸に関して斜めの方向を意味している。 According to a first aspect of the present invention, this problem is solved by an engine according to claim 1. In the engine, the single or each opening that communicates the main combustion chamber with the pre-combustion chamber extends generally in the tangential direction of the pre-combustion chamber, thereby flowing from the main combustion chamber into the pre-combustion chamber. The lean fuel gas / air mixture is subject to the vortex flow of the precombustion chamber.
Here, the “tangential direction of the pre-combustion chamber” means an oblique direction with respect to the transition portion from the pre-combustion chamber to the main combustion chamber, that is, an oblique direction with respect to the axis of the pre-combustion chamber.

本発明の第一の態様によれば、チャンバ内では渦流によって、渦の中心における静圧を低下させることが可能であり、それゆえ、より少量の電気的負荷で前記単独のまたは各点火装置に点火することが可能となる。予燃焼室内の点火箇所における圧力レベルを低下させることによって、前記単独のまたは各点火装置の耐用期間は明らかに延長され、最終的には保守整備間隔の延長に帰着する。   According to the first aspect of the present invention, it is possible to reduce the static pressure at the center of the vortex by vortex flow in the chamber, and thus to the single or each igniter with a smaller electrical load. It becomes possible to ignite. By reducing the pressure level at the ignition point in the pre-combustion chamber, the service life of the single or each igniter is clearly extended, eventually resulting in an extended maintenance interval.

本発明の第二の態様によれば、本課題は請求項６に記載のエンジンによって解決される。当該エンジンでは、予燃焼室内へは複数の点火装置が突出している。   According to a second aspect of the present invention, this problem is solved by an engine according to claim 6. In the engine, a plurality of ignition devices protrude into the pre-combustion chamber.

本発明の第二の態様によれば、エンジンは、予燃焼室内に突出し交互に作動する点火装置を備えている。したがって、点火の度に点火装置の一部のみが常に交互に使用されるため、これによっても保守整備間隔が延長可能となる。例えば、Ｎ個の点火装置を備えた点火装置で、点火の度に常に一つの点火装置のみが使用される場合、点火装置ごとの点火回数は１／Ｎに減少し、保守整備間隔はＮ倍に延長される。   According to the second aspect of the present invention, the engine includes ignition devices that protrude into the precombustion chamber and operate alternately. Accordingly, since only a part of the ignition device is always used alternately every time ignition is performed, this also makes it possible to extend the maintenance interval. For example, when only one ignition device is always used for each ignition in an ignition device having N ignition devices, the number of times of ignition for each ignition device is reduced to 1 / N, and the maintenance interval is N times. To be extended.

本発明の上記二つの態様は、単独で、または両者を組み合わせて活用することができる。   The above two aspects of the present invention can be utilized alone or in combination.

本発明の好適なさらなる構成は、個々の従属請求項と後続の詳細な説明に記載されている。本発明の実施例については、以下に図を用いて詳細に説明するが、本発明はこれに限定されない。   Preferred further configurations of the invention are described in the individual dependent claims and the subsequent detailed description. Examples of the present invention will be described in detail below with reference to the drawings, but the present invention is not limited to these.

本発明に係るエンジンの部分概略図である。1 is a partial schematic view of an engine according to the present invention. 図１に示された予燃焼室４の第一予燃焼室８で、第一予燃焼室８内に突出する４つの点火装置６を有する第一予燃焼室８の概略図である。FIG. 2 is a schematic view of a first pre-combustion chamber 8 having four ignition devices 6 protruding into the first pre-combustion chamber 8 in the first pre-combustion chamber 8 of the pre-combustion chamber 4 shown in FIG. 1. 図１に示された予燃焼室４の第一予燃焼室８で、第一予燃焼室８内に突出する４つの点火装置６を有する第一予燃焼室８の概略図である。FIG. 2 is a schematic view of a first pre-combustion chamber 8 having four ignition devices 6 protruding into the first pre-combustion chamber 8 in the first pre-combustion chamber 8 of the pre-combustion chamber 4 shown in FIG. 1.

図１は、本発明に係るエンジンで、好適にはオットーサイクルエンジンとして実施されるエンジンにおける、主燃焼室２を画定するシリンダヘッド１の領域の部分概略図である。図１によれば、当該エンジンのシリンダヘッド１にはインサート部３が係合し、インサート３部は好適にはシリンダヘッド１内に螺入している。このとき、インサート部３は予燃焼室４を画定し、当該予燃焼室４は主燃焼室２から分離され、少なくとも１つの開口部５を介して主燃焼室２と連通する。   FIG. 1 is a partial schematic view of a region of a cylinder head 1 that defines a main combustion chamber 2 in an engine according to the invention, preferably implemented as an Otto cycle engine. According to FIG. 1, an insert portion 3 is engaged with a cylinder head 1 of the engine, and the insert 3 portion is preferably screwed into the cylinder head 1. At this time, the insert portion 3 defines a pre-combustion chamber 4, which is separated from the main combustion chamber 2 and communicates with the main combustion chamber 2 through at least one opening 5.

予燃焼室４内には少なくとも１つの点火装置６が突出しており、当該点火装置６は好適にはシールド被覆されている。高圧燃料ガス導管に接続された燃料ガスノズル７を介して、予燃焼室４内に燃料ガスが高圧下で噴射される。このとき、燃料ガスノズル７を介して予燃焼室４内に高圧下で噴射された燃料ガスは、予燃焼室４内に存在する希薄な燃料ガス・空気混合気と混合され、当該燃料ガス・空気混合気の濃度を増大させる。濃度が増大した当該燃料ガス・空気混合気は次に、前記単独のまたは各点火装置６によって点火されうる。前記単独のまたは各点火装置６として、グロープラグまたは点火プラグが使用可能である。   At least one ignition device 6 projects into the pre-combustion chamber 4, and the ignition device 6 is preferably shield-coated. Fuel gas is injected under high pressure into the pre-combustion chamber 4 through a fuel gas nozzle 7 connected to a high-pressure fuel gas conduit. At this time, the fuel gas injected under high pressure into the pre-combustion chamber 4 through the fuel gas nozzle 7 is mixed with the lean fuel gas / air mixture present in the pre-combustion chamber 4, and the fuel gas / air Increase the concentration of the mixture. The fuel gas / air mixture with increased concentration can then be ignited by the single or each ignition device 6. A glow plug or a spark plug can be used as the single or each ignition device 6.

図１に示された本発明に係るエンジンでは、予燃焼室４は複数の開口部５を介して主燃焼室２と連通されており、開口部５は予燃焼室４の接線方向に概ね延在している。このとき、開口部５は径方向に延在することも可能であるが、本発明の第一の態様からすると、予燃焼室４内に主燃焼室２から流入する燃料ガス・空気混合気に対して予燃焼室４内において確実に渦流の作用を受けさせるためには、接線方向に延在することが重要である。当該渦流の効果を十分に活用することによって、予燃焼室４内部、すなわち予燃焼室４の中央部分において静圧が低下し、最終的には前記単独のまたは各点火装置６に対して調達しなければならない点火エネルギーは減少し、前記単独のまたは各点火装置６の耐用期間は延長される。
ここで、「予燃焼室の接線方向」とは、予燃焼室から主燃焼室への移行部分に関して斜めの方向、すなわち予燃焼室の軸に関して斜めの方向を意味し、「予燃焼室の径方向」とは、予燃焼室の外部境界に向かう方向を意味している。 In the engine according to the present invention shown in FIG. 1, the precombustion chamber 4 communicates with the main combustion chamber 2 through a plurality of openings 5, and the openings 5 extend substantially in the tangential direction of the precombustion chamber 4. Exist. At this time, the opening 5 can extend in the radial direction. However, according to the first aspect of the present invention, the fuel gas / air mixture flowing from the main combustion chamber 2 into the precombustion chamber 4 is formed. On the other hand, it is important to extend in the tangential direction in order to ensure the effect of the vortex flow in the precombustion chamber 4. By fully utilizing the effect of the eddy current, the static pressure in the pre-combustion chamber 4, that is, in the central portion of the pre-combustion chamber 4, is finally increased for the single or each ignition device 6. The ignition energy that must be reduced, and the lifetime of the single or each igniter 6 is extended.
Here, the “tangential direction of the pre-combustion chamber” means an oblique direction with respect to the transition portion from the pre-combustion chamber to the main combustion chamber, that is, an oblique direction with respect to the axis of the pre-combustion chamber. “Direction” means the direction toward the external boundary of the pre-combustion chamber.

図１の実施例では、予燃焼室４は第一予燃焼室８と第二予燃焼室９とに区分されており、両者は管１０によって互いに連通されている。このとき、図１によれば、予燃焼室４と主燃焼室２とを連通させる開口部５は、第二予燃焼室９に合流している。これに対して、第一予燃焼室８内へは点火装置６が突出している。さらに、ガスノズル７の噴射方向は、第一予燃焼室８内および／または第二予燃焼室９にも向けられている。それにともない、主燃焼室２から予燃焼室４内に流入する燃料ガス・空気混合気は、予燃焼室４の第二予燃焼室９において、渦流の作用を受けている。おおよそ第一予燃焼室８および第二予燃焼室９の軸対称な中心部分に係合する管１０を介して、予燃焼室９内のほぼ渦流の軸対称な中心において支配的な低圧は、第一予燃焼室８に誘導可能であり、その結果、第一予燃焼室８内では、明らかに低下した圧力レベルが支配的となる。点火プロセスにおいて点火装置６が実現する出力を低くできる限りは、点火装置６の耐用期間は最終的に延長される。   In the embodiment of FIG. 1, the pre-combustion chamber 4 is divided into a first pre-combustion chamber 8 and a second pre-combustion chamber 9, which are communicated with each other by a pipe 10. At this time, according to FIG. 1, the opening 5 that connects the precombustion chamber 4 and the main combustion chamber 2 joins the second precombustion chamber 9. On the other hand, the ignition device 6 protrudes into the first precombustion chamber 8. Furthermore, the injection direction of the gas nozzle 7 is also directed to the first precombustion chamber 8 and / or the second precombustion chamber 9. Accordingly, the fuel gas / air mixture flowing from the main combustion chamber 2 into the precombustion chamber 4 is subjected to vortex flow in the second precombustion chamber 9 of the precombustion chamber 4. Through a tube 10 that engages approximately the axially symmetric central portions of the first precombustion chamber 8 and the second precombustion chamber 9, the dominant low pressure at the approximately vortex axisymmetric center in the precombustion chamber 9 is It can be guided to the first pre-combustion chamber 8, so that a clearly reduced pressure level is dominant in the first pre-combustion chamber 8. As long as the output achieved by the igniter 6 in the ignition process can be lowered, the useful life of the igniter 6 is finally extended.

したがって、本発明の第一の態様によると、本発明に係るエンジンの点火装置の領域では、開口部５および場合によっては予燃焼室４の特殊なジオメトリによって、前記単独のまたは各点火装置の領域における圧力レベルは明らかに低下する。それによって、前記単独のまたは各点火装置６の領域で点火プロセスごとに必要となる点火エネルギーは減少し、前記単独のまたは各点火装置６の耐用期間は、必要な点火出力が減少するとともに過度に延長される。   Thus, according to the first aspect of the invention, in the region of the ignition device of the engine according to the invention, the region of the individual or each ignition device depends on the special geometry of the opening 5 and possibly the precombustion chamber 4. The pressure level at is clearly reduced. Thereby, the ignition energy required for each ignition process in the region of the single or each igniter 6 is reduced, and the useful life of the single or each igniter 6 is excessively reduced as the required ignition output decreases. Extended.

上述のように、予燃焼室を第一予燃焼室８と第二予燃焼室９とを有する縦列式渦流室として設定することのさらなる利点は、点火装置６の領域で、燃料ガス・空気混合気の処理が改善されうることにある。ガスノズル７がほぼ第一予燃焼室８の軸対称な中心に位置することによって、点火装置６の領域では燃料ガス・空気混合気が制御され、安定するように調整が行われる。また、混合気の調整が改善すると、必要な点火出力を低下させ、それによって点火装置の耐用期間を延長することも可能となる。   As described above, the further advantage of setting the pre-combustion chamber as a tandem vortex chamber having a first pre-combustion chamber 8 and a second pre-combustion chamber 9 is that in the region of the igniter 6, fuel gas / air mixing is performed. Qi processing can be improved. Since the gas nozzle 7 is positioned substantially in the center of the first precombustion chamber 8 in the axial symmetry, the fuel gas / air mixture is controlled and adjusted so as to be stable in the region of the ignition device 6. In addition, when the mixture adjustment is improved, the required ignition output can be reduced, thereby extending the useful life of the ignition device.

本発明の第二の態様は、単独で、または本発明の第一の態様と組み合わせて活用することができるが、当該第二の態様によると、予燃焼室４、すなわち図１に示された実施例では予燃焼室４の第一予燃焼室８内には複数の点火装置６が突出しており、当該点火装置６は図示されていない制御装置によって交互に作動可能である。   The second aspect of the present invention can be utilized alone or in combination with the first aspect of the present invention, but according to the second aspect, the pre-combustion chamber 4, ie, shown in FIG. In the embodiment, a plurality of ignition devices 6 project into the first pre-combustion chamber 8 of the pre-combustion chamber 4, and the ignition devices 6 can be alternately operated by a control device (not shown).

したがって、点火の度に前記制御装置は点火装置の一部のみを作動させるため、点火の度に全ての点火装置６が起動するのではなく、点火装置６の一部の点火装置のみが起動するのである。このとき、一部の点火装置は１つでもよい。   Therefore, since the control device operates only a part of the ignition device every time ignition is performed, not all the ignition devices 6 are activated every time ignition is performed, but only a part of the ignition devices of the ignition device 6 is activated. It is. At this time, a part of the ignition device may be one.

Ｎ個の点火装置が予燃焼室４内に突出しており、点火の度に常に１つの点火装置のみが作動され、使用される場合、作動時間単位での各点火装置６の点火回数は１／Ｎにまで減少可能であり、それによって作動時間中の当該点火装置の摩耗は減少し、最終的には保守整備間隔は明らかに延長されうる。   When N ignition devices protrude into the pre-combustion chamber 4 and only one ignition device is always operated and used every time the ignition is performed, the number of ignitions of each ignition device 6 in units of operating time is 1 / N can be reduced to N, so that the wear of the ignition device during the operating time is reduced, and finally the maintenance interval can be clearly extended.

図２および図３は、図１に示された予燃焼室４の第一予燃焼室８で、第一予燃焼室８内に突出する４つの点火装置６を有する第一予燃焼室８の概略図である。図２の実施例では、点火の度に、常に交互に１つの点火装置６のみが作動もしくは起動される。これに対し、図３の実施例では、点火の度に２つの点火装置６が起動され、作動される。   2 and 3 show the first pre-combustion chamber 8 of the pre-combustion chamber 4 shown in FIG. 1 and the first pre-combustion chamber 8 having four ignition devices 6 protruding into the first pre-combustion chamber 8. FIG. In the embodiment of FIG. 2, only one ignition device 6 is always activated or activated every time ignition is performed. On the other hand, in the embodiment of FIG. 3, the two ignition devices 6 are activated and actuated for each ignition.

特に有利なのは、本発明の２つの態様を互いに組み合わせたエンジンである。そのようなエンジンは、第一予燃焼室８と第二予燃焼室９とに区分された予燃焼室は、予燃焼室４の第二予燃焼室９と主燃焼室２との間に接線方向に概ね延在する開口部５を有する一方で、予燃焼室４の第一予燃焼室８内には、中央にその噴射方向が第一予燃焼室８に向けられているガスノズル７、および複数の点火装置６が突出している。   Particularly advantageous is an engine that combines two aspects of the present invention. In such an engine, the pre-combustion chamber divided into the first pre-combustion chamber 8 and the second pre-combustion chamber 9 is tangent between the second pre-combustion chamber 9 and the main combustion chamber 2 of the pre-combustion chamber 4. A gas nozzle 7 having an opening 5 extending generally in the direction, in the first precombustion chamber 8 of the precombustion chamber 4, the injection direction of which is directed at the center toward the first precombustion chamber 8, and A plurality of ignition devices 6 protrude.

１ シリンダヘッド
２ 主燃焼室
３ インサート部
４ 予燃焼室
５ 開口部
６ 点火装置
７ 燃料ガスノズル
８ 第一予燃焼室
９ 第二予燃焼室
１０ 管 DESCRIPTION OF SYMBOLS 1 Cylinder head 2 Main combustion chamber 3 Insert part 4 Precombustion chamber 5 Opening part 6 Ignition device 7 Fuel gas nozzle 8 First precombustion chamber 9 Second precombustion chamber 10 Pipe

Claims (9)

主燃焼室（２）と当該主燃焼室（２）から分離された予燃焼室（４）とを有する、燃料ガスのためのエンジンであって、
前記予燃焼室（４）は複数の開口部（５）を介して前記主燃焼室（２）と連通されており、
前記予燃焼室（４）には高圧燃料ガス導管に接続された少なくとも１つの燃料ガスノズル（７）の噴射方向が向けられており、それによって燃料ガスが前記予燃焼室内に運搬されて前記予燃焼室内に存在する希薄な燃料ガス・空気混合気と混合され、
前記エンジンは前記予燃焼室内に突出する複数の点火装置（６）を有し、それによって、濃度が増大した前記燃料ガス・空気混合気に点火を行うエンジンにおいて、
前記主燃焼室（２）と前記予燃焼室（４）とを連通させている前記複数の開口部（５）は、前記予燃焼室から前記主燃焼室への移行部分に関して斜めの方向であって、前記予燃焼室の軸線に関して斜めの方向である、前記予燃焼室（４）の接線方向に概ね延在しており、それによって前記主燃焼室（２）から前記予燃焼室（４）へ流入する希薄な燃料ガス・空気混合気は、前記予燃焼室（４）内で渦流の作用を受けることを特徴とするエンジン。 An engine for fuel gas, having a main combustion chamber (2) and a precombustion chamber (4) separated from the main combustion chamber (2),
The pre-combustion chamber (4) communicates with the main combustion chamber (2) through a plurality of openings (5),
The pre-combustion chamber (4) is directed with an injection direction of at least one fuel gas nozzle (7) connected to a high-pressure fuel gas conduit, whereby fuel gas is transported into the pre-combustion chamber and the pre-combustion chamber. Mixed with the lean fuel gas / air mixture present in the room,
The engine includes a plurality of ignition devices (6) protruding into the pre-combustion chamber, and thereby igniting the fuel gas / air mixture having an increased concentration,
The plurality of openings (5) communicating the main combustion chamber (2) and the precombustion chamber (4) are in an oblique direction with respect to a transition portion from the precombustion chamber to the main combustion chamber. Extending substantially in a tangential direction of the pre-combustion chamber (4), which is oblique with respect to the axis of the pre-combustion chamber, thereby extending from the main combustion chamber (2) to the pre-combustion chamber (4). The engine is characterized in that the lean fuel gas / air mixture flowing into the engine is subjected to a vortex action in the pre-combustion chamber (4). 前記予燃焼室（４）が第一予燃焼室（８）と第二予燃焼室（９）とに区分されており、前記第一予燃焼室（８）と前記第二予燃焼室（９）とは、中央の管（１０）を介して相互に連通されており、前記単独のまたは各燃料ガスノズル（７）および前記単独のまたは各点火装置（６）は、前記予燃焼室（４）の前記第一予燃焼室および／または前記第二予燃焼室（８，９）内に向けられもしくは突出しており、前記複数の開口部（５）は前記主燃焼室（２）と前記予燃焼室（４）の前記第二予燃焼室（９）とを連通させることを特徴とする請求項１に記載のエンジン。 The pre-combustion chamber (4) is divided into a first pre-combustion chamber (8) and a second pre-combustion chamber (9), and the first pre-combustion chamber (8) and the second pre-combustion chamber (9 Are connected to each other via a central pipe (10), and the single or each fuel gas nozzle (7) and the single or each ignition device (6) are connected to the pre-combustion chamber (4). Are directed or projecting into the first precombustion chamber and / or the second precombustion chamber (8, 9), and the plurality of openings (5) are connected to the main combustion chamber (2) and the precombustion. Engine according to claim 1, characterized in that the second precombustion chamber (9) of the chamber (4) is in communication. 前記主燃焼室（２）から前記予燃焼室（４）内に流入する希薄な燃料ガス・空気混合気は、前記予燃焼室（４）の前記第二予燃焼室（９）において渦流の作用を受けることを特徴とする請求項２に記載のエンジン。   The lean fuel gas / air mixture flowing into the pre-combustion chamber (4) from the main combustion chamber (2) acts as a vortex in the second pre-combustion chamber (9) of the pre-combustion chamber (4). The engine according to claim 2, wherein 第一予燃焼室（８）および第二予燃焼室（９）の中心部分において、前記管（１０）が両予燃焼室に係合し、それによって前記第一予燃焼室（８）内では、希薄な燃料ガス・空気混合気の圧力レベルが、前記管（１０）が両予燃焼室に係合していない場合の希薄な燃料ガス・空気混合気の圧力レベルよりも低く調整されることを特徴とする請求項２または３に記載のエンジン。   In the central part of the first pre-combustion chamber (8) and the second pre-combustion chamber (9), the pipe (10) engages both pre-combustion chambers, so that in the first pre-combustion chamber (8) The pressure level of the lean fuel gas / air mixture is adjusted to be lower than the pressure level of the lean fuel gas / air mixture when the pipe (10) is not engaged with both pre-combustion chambers. The engine according to claim 2 or 3, characterized in that. 主燃焼室と当該主燃焼室から分離された予燃焼室とを有する、燃料ガスのためのエンジンであって、前記予燃焼室は複数の開口部を介して前記主燃焼室と連通されており、前記予燃焼室には高圧燃料ガス導管に接続された少なくとも１つの燃料ガスノズルの噴射方向が向けられており、それによって燃料ガスが前記予燃焼室内に運搬されて前記予燃焼室内に存在する希薄な燃料ガス・空気混合気と混合され、前記エンジンは前記予燃焼室内に突出する複数の点火装置を有し、それによって、濃度が増大した前記燃料ガス・空気混合気に点火を行うエンジンにおいて、
前記予燃焼室（４）内に複数の点火装置（６）が突出していることを特徴とするエンジン。 An engine for fuel gas having a main combustion chamber and a precombustion chamber separated from the main combustion chamber, wherein the precombustion chamber communicates with the main combustion chamber through a plurality of openings. The pre-combustion chamber is directed with an injection direction of at least one fuel gas nozzle connected to a high-pressure fuel gas conduit, whereby the fuel gas is transported into the pre-combustion chamber and present in the pre-combustion chamber. In an engine that has a plurality of ignition devices that are mixed with a different fuel gas / air mixture and project into the pre-combustion chamber, thereby igniting the fuel gas / air mixture having an increased concentration,
An engine characterized by a plurality of ignition devices (6) projecting into the pre-combustion chamber (4). 制御装置が前記点火装置（６）を交互に作動させることを特徴とする請求項５に記載のエンジン。   6. Engine according to claim 5, characterized in that a control device operates the ignition devices (6) alternately. 前記制御装置が点火の度に前記点火装置（６）の一部を作動させることを特徴とする請求項６に記載のエンジン。   The engine according to claim 6, characterized in that the control device activates a part of the ignition device (6) for each ignition. 請求項５から７のいずれか一項または複数項に記載の特徴を有する請求項１から４のいずれか一項に記載のエンジン。   The engine according to any one of claims 1 to 4, wherein the engine has the characteristics according to any one of claims 5 to 7. 請求項１から４のいずれか一項または複数項に記載の特徴を有する請求項５から７のいずれか一項に記載のエンジン。   The engine according to any one of claims 5 to 7, which has the characteristics according to any one of claims 1 to 4.
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