JP4675191B2 - Gas engine - Google Patents

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JP4675191B2
JP4675191B2 JP2005256431A JP2005256431A JP4675191B2 JP 4675191 B2 JP4675191 B2 JP 4675191B2 JP 2005256431 A JP2005256431 A JP 2005256431A JP 2005256431 A JP2005256431 A JP 2005256431A JP 4675191 B2 JP4675191 B2 JP 4675191B2
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intake
gas
intake air
inlet portion
manifold
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JP2007071052A (en
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義幸 新居
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Hino Motors Ltd
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    • 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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Description

本発明は、天然ガス等のガス燃料を使用して駆動するガスエンジンに関するものである。   The present invention relates to a gas engine that is driven using a gas fuel such as natural gas.

近年、天然ガス（ＣＮＧ：Compressed Natural Gas）は、自動車用低公害燃料として、また、石油代替燃料として注目されており、天然ガス自動車の開発が世界的に進められている状況にあるが、より性能の高い安全な天然ガス自動車の開発に向け様々な研究が続けられているところである。   In recent years, natural gas (CNG) has been attracting attention as a low-pollution fuel for automobiles and as an alternative fuel for petroleum, and the development of natural gas automobiles is in progress worldwide. Various researches are underway for the development of high-performance and safe natural gas vehicles.

図４は前述したガスエンジン（ＣＮＧエンジン）の一例を示すもので、図中１はエンジン本体、２は該エンジン本体１の各気筒へ吸気３を分配する吸気マニホールドを示し、該吸気マニホールド２の吸気入口部４に対しスロットルバルブ５を介して吸気パイプ６（吸気流路）が接続されており、この吸気パイプ６におけるスロットルバルブ５の直前位置には、図示しないガスボンベからレギュレータ等を介し減圧されて導かれた天然ガス７を噴射するガス供給ノズル８が吸気パイプ６の半径方向から貫通設置されるようになっている。   FIG. 4 shows an example of the above-described gas engine (CNG engine). In the figure, reference numeral 1 denotes an engine body, 2 denotes an intake manifold that distributes intake air 3 to each cylinder of the engine body 1, and An intake pipe 6 (intake flow path) is connected to the intake inlet 4 via a throttle valve 5, and a position immediately before the throttle valve 5 in the intake pipe 6 is decompressed via a regulator or the like from a gas cylinder (not shown). A gas supply nozzle 8 for injecting the guided natural gas 7 is installed so as to penetrate from the radial direction of the intake pipe 6.

即ち、斯かるガスエンジンにあっては、ガス供給ノズル８の先端から噴射された天然ガス７が吸気パイプ６内の吸気３に混合されて吸気マニホールド２の吸気入口部４に導入され、該吸気マニホールド２によりエンジン本体１の各気筒に分配されて該各気筒内の燃焼室で点火プラグによる着火により燃焼されるようにしてある。   That is, in such a gas engine, the natural gas 7 injected from the tip of the gas supply nozzle 8 is mixed with the intake air 3 in the intake pipe 6 and introduced into the intake inlet portion 4 of the intake manifold 2, and the intake air It is distributed to each cylinder of the engine body 1 by the manifold 2 and burned by ignition by a spark plug in the combustion chamber in each cylinder.

尚、この種のガスエンジンに関連する先行技術文献情報としては次のものがある。
特開平７−１９７８６０号公報 In addition, there exists the following as prior art literature information relevant to this kind of gas engine.
JP-A-7-197860

しかしながら、斯かる従来のガスエンジンにおいては、吸気３の流れが吸気マニホールド２の長手方向に対し略直角な向きから比較的緩やかなカーブを描いて吸気入口部４に流れ込むようになっており、吸気３が吸気入口部４内の壁面に衝突したりすることもなく円滑に流れ込むため、ガス供給ノズル８から噴射された天然ガス７と吸気３との混合が良好に進まないうちに吸気マニホールド２から各気筒に分配されてしまうという不具合が起こり易く、例えば、ガス供給ノズル８による天然ガス７の噴射位置より下流側の吸気パイプ６や吸気マニホールド２の吸気入口部４を幾つかの屈曲部を介在させながら長尺化して天然ガス７の混合を促進させる等といった措置を採らざるを得なくなり、周辺構造物との干渉を招かない吸気流路のコンパクトなレイアウトが難しくなるという問題があった。   However, in such a conventional gas engine, the flow of the intake air 3 flows into the intake inlet portion 4 while drawing a relatively gentle curve from a direction substantially perpendicular to the longitudinal direction of the intake manifold 2. 3 flows smoothly without colliding with the wall surface in the intake inlet portion 4, so that the mixing of the natural gas 7 injected from the gas supply nozzle 8 and the intake air 3 does not proceed well before the intake manifold 2 The problem of being distributed to each cylinder is likely to occur. For example, the intake pipe 6 on the downstream side of the injection position of the natural gas 7 by the gas supply nozzle 8 and the intake inlet portion 4 of the intake manifold 2 are interposed with some bent portions. It is necessary to take measures such as promoting the mixing of the natural gas 7 by increasing the length of the intake gas, and the intake passage compactor that does not cause interference with surrounding structures. There is a problem that door layout is difficult.

本発明は上述の実情に鑑みてなしたもので、極力短い吸気流路内でガス燃料と吸気を良好に混合し得るようにしたガスエンジンを提供することを目的としている。   The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a gas engine capable of satisfactorily mixing gas fuel and intake air in an intake passage as short as possible.

本発明は、吸気マニホールドの吸気入口部に吸気の導入方向に対し該吸気の流れを折り返すような屈曲形状を付し、この吸気入口部より上流側にガス燃料を吸気の流れに対向して噴射するガス供給ノズルを設けると共に、該ガス供給ノズルの上流側にガス燃料の噴射方向に沿う所要長さの直進部を確保したことを特徴とするガスエンジン、に係るものである。 In the present invention, the intake inlet portion of the intake manifold is provided with a bent shape so that the flow of intake air is folded back with respect to the intake introduction direction, and gas fuel is injected upstream of the intake inlet portion so as to oppose the intake air flow. gas supply nozzle provided Rutotomoni to, those of the gas engine, characterized in that to ensure a straight portion of predetermined length along the direction of injection of fuel gas on the upstream side of the gas supply nozzles.

而して、このようにすれば、ガス供給ノズルから吸気の流れに対向してガス燃料が噴射されることで互いの流れがぶつかり合い、双方が乱流化してガス燃料と吸気との混合が促進されると共に、そのガス燃料を含む吸気の流れが吸気マニホールドの吸気入口部で急激に折り返されることで吸気が吸気入口部内の壁面に衝突してガス燃料と吸気との更なる混合が促進されることになる。しかも、ガス供給ノズルの上流側にガス燃料の噴射方向に沿う所要長さの直進部を確保しているため、該直進部により流れが安定して偏りが少なくなった吸気に対しガス燃料を噴射して混合せしめることが可能となる。 Thus, in this way, the gas fuel is injected from the gas supply nozzle in opposition to the flow of the intake air so that the flows collide with each other, both of which become turbulent and the mixing of the gas fuel and the intake air is prevented. In addition, the flow of the intake air containing the gas fuel is suddenly turned back at the intake inlet portion of the intake manifold, so that the intake air collides with the wall surface in the intake inlet portion and further mixing of the gas fuel and the intake air is promoted. Will be. In addition, since a straight part having a required length along the injection direction of the gas fuel is secured on the upstream side of the gas supply nozzle, the gas fuel is injected into the intake air whose flow is stable and less biased by the straight part. And can be mixed.

この結果、吸気流路を幾つかの屈曲部を介在させながら長尺化してガス燃料の混合を促進させる等といった措置を採らなくても、極力短い吸気流路内でガス燃料と吸気を良好に混合させることが可能となる。   As a result, it is possible to improve the gas fuel and intake air in the shortest intake flow path without taking measures such as elongating the intake flow path while interposing several bent portions to promote mixing of gas fuel. It can be mixed.

また、本発明においては、吸気入口部が吸気マニホールドの長手方向一端部に配置され且つ前記吸気入口部に吸気を導く吸気流路が前記吸気マニホールドに沿い長手方向他端部側から延在していることが好ましい。   Further, in the present invention, the intake inlet portion is disposed at one end portion in the longitudinal direction of the intake manifold, and an intake passage that guides intake air to the intake inlet portion extends from the other end portion in the longitudinal direction along the intake manifold. Preferably it is.

このようにすれば、吸気マニホールドに沿い長手方向他端部側から一端部側へ導かれた吸気が、吸気マニホールドの他端部側へ向けて折り返されることになるので、もともと吸気が偏って導かれ易かった吸気入口部に近い気筒への吸気の分配が抑制されると共に、吸気入口部から遠い気筒への積極的な分配が促進され、全体として各気筒への吸気の分配の均等化を図ることが可能となる。   In this way, the intake air guided from the other end side in the longitudinal direction along the intake manifold to the other end side of the intake manifold is folded back toward the other end side of the intake manifold. The distribution of the intake air to the cylinders close to the intake inlet, which was easy to be controlled, is suppressed, and the active distribution to the cylinders far from the intake inlet is promoted, so that the distribution of the intake air to the cylinders as a whole is equalized. It becomes possible.

また、ガス供給ノズルの先端は、吸気流路の軸心部付近に配置されていることが好ましく、このような吸気流路の軸心部付近では吸気の流れが比較的安定しているので、ここにガス供給ノズルの先端からガス燃料を噴射することで偏りの少ないガス燃料の分散を図ることが可能となる。   The tip of the gas supply nozzle is preferably disposed near the axial center of the intake flow path, and the flow of intake air is relatively stable near the axial center of the intake flow path. Here, by injecting the gas fuel from the tip of the gas supply nozzle, it is possible to achieve a dispersion of the gas fuel with little bias.

上記した本発明のガスエンジンによれば、下記の如き種々の優れた効果を奏し得る。   According to the gas engine of the present invention described above, various excellent effects as described below can be obtained.

（Ｉ）本発明の請求項１に記載の発明によれば、吸気流路を幾つかの屈曲部を介在させながら長尺化してガス燃料の混合を促進させる等といった措置を採らなくても、極力短い吸気流路内でガス燃料と吸気を良好に混合させることができるので、周辺構造物との干渉を招かない吸気流路のコンパクトなレイアウトを実現することができ、車両への搭載性を従来より大幅に向上することができる。   (I) According to the invention described in claim 1 of the present invention, even if measures such as elongating the intake flow path with some bent portions interposed to promote gas fuel mixing are taken. Gas fuel and intake air can be mixed well in the intake passage that is as short as possible, so a compact layout of the intake passage that does not cause interference with surrounding structures can be realized, and mounting on a vehicle is improved. This can be greatly improved compared to the prior art.

（ＩＩ）本発明の請求項２に記載の発明によれば、もともと吸気が偏って導かれ易かった吸気入口部に近い気筒への吸気の分配を抑制し且つ吸気入口部から遠い気筒への積極的な分配を促進することができるので、各気筒への吸気の分配を均等化することができてエンジン性能の大幅な向上を図ることができる。   (II) According to the invention described in claim 2 of the present invention, the distribution of the intake air to the cylinders close to the intake inlet portion where the intake air was originally easily biased is suppressed, and the aggressiveness to the cylinders far from the intake inlet portion is suppressed. Therefore, the distribution of the intake air to each cylinder can be equalized, and the engine performance can be greatly improved.

（ＩＩＩ）本発明の請求項３に記載の発明によれば、吸気の流れが比較的安定している吸気流路の軸心部付近にガス供給ノズルの先端からガス燃料を噴射して偏りの少ないガス燃料の分散を図ることができるので、ガス燃料と吸気との更に良好な混合を実現することができる。 ( III ) According to the invention described in claim 3 of the present invention, the gas fuel is injected from the tip of the gas supply nozzle near the axial center of the intake passage where the flow of the intake air is relatively stable. Since less gas fuel can be dispersed, better mixing of the gas fuel and the intake air can be realized.

以下本発明の実施の形態を図面を参照しつつ説明する。   Embodiments of the present invention will be described below with reference to the drawings.

図１は本発明を実施する形態の一例を示すもので、図４と同一の符号を付した部分は同一物を表わしている。   FIG. 1 shows an example of an embodiment for carrying out the present invention, and the same reference numerals as those in FIG. 4 denote the same components.

図１に示す如く、本形態例においては、前述した図４のものと略同様に構成したガスエンジン（ＣＮＧエンジン）に関し、吸気マニホールド２の吸気入口部４に吸気３の導入方向に対し該吸気３の流れを折り返すような屈曲形状が付されており、この吸気入口部４より上流側の吸気パイプ６（吸気流路）には、天然ガス７（ガス燃料）を吸気３の流れに対向して噴射するよう先端をＬ字状に曲げたガス供給ノズル８が設けられている。   As shown in FIG. 1, the present embodiment relates to a gas engine (CNG engine) configured substantially the same as that of FIG. 4 described above, and the intake air is introduced into the intake inlet portion 4 of the intake manifold 2 with respect to the intake direction of the intake air 3. 3, and a natural gas 7 (gas fuel) is opposed to the flow of the intake air 3 in the intake pipe 6 (intake passage) upstream of the intake inlet 4. A gas supply nozzle 8 having a tip bent into an L shape is provided.

ここに例示しているガスエンジンでは、吸気入口部４が吸気マニホールド２の長手方向一端部に配置されており、この吸気入口部４に吸気３を導く吸気パイプ６が前記吸気マニホールド２に沿い長手方向他端部側から延在してスロットルバルブ５を介し前記吸気入口部４に接続されている。   In the gas engine illustrated here, the intake inlet portion 4 is disposed at one end portion in the longitudinal direction of the intake manifold 2, and the intake pipe 6 that guides the intake air 3 to the intake manifold portion 4 extends along the intake manifold 2. It extends from the other end side in the direction and is connected to the intake inlet 4 via the throttle valve 5.

また、ガス供給ノズル８の上流側の吸気パイプ６には、天然ガス７の噴射方向に沿う所要長さＰの直進部９が確保されており、この直進部９をガス供給ノズル８の先端と吸気パイプ６の曲がり形状の終端との間に確保することで吸気３の流れの安定化を図り得るようにしてあり、しかも、このガス供給ノズル８の先端が吸気パイプ６の軸心部付近に配置されるようにしてある。   The intake pipe 6 on the upstream side of the gas supply nozzle 8 is provided with a rectilinear portion 9 having a required length P along the injection direction of the natural gas 7. The rectilinear portion 9 is connected to the tip of the gas supply nozzle 8. By securing it between the bent end of the intake pipe 6, the flow of the intake 3 can be stabilized, and the tip of the gas supply nozzle 8 is located near the axial center of the intake pipe 6. It is supposed to be arranged.

尚、直進部９の長さＰは、吸気パイプ６の口径が約８０〜９０ｍｍ程度である場合に、少なくとも約２５ｍｍ程度を直進部９の長さＰとして確保すると良い。   The length P of the rectilinear portion 9 should be at least about 25 mm as the length P of the rectilinear portion 9 when the diameter of the intake pipe 6 is about 80 to 90 mm.

而して、このようにガスエンジンを構成した場合、ガス供給ノズル８から吸気３の流れに対向して天然ガス７が噴射されることで互いの流れがぶつかり合い、双方が乱流化して天然ガス７と吸気３との混合が促進されると共に、その天然ガス７を含む吸気３の流れが吸気マニホールド２の吸気入口部４で急激に折り返されることで吸気３が吸気入口部４内の壁面に衝突して天然ガス７と吸気３との更なる混合が促進されることになる。   Thus, when the gas engine is configured in this way, the natural gas 7 is injected from the gas supply nozzle 8 in opposition to the flow of the intake air 3 so that the flows collide with each other, both of which are turbulent and natural. Mixing of the gas 7 and the intake air 3 is promoted, and the flow of the intake air 3 including the natural gas 7 is suddenly turned back at the intake air inlet portion 4 of the intake manifold 2, so that the intake air 3 becomes a wall surface in the intake air inlet portion 4. And further mixing of the natural gas 7 and the intake air 3 is promoted.

この結果、吸気パイプ６を幾つかの屈曲部を介在させながら長尺化して天然ガス７の混合を促進させる等といった措置を採らなくても、極力短い吸気パイプ６内で天然ガス７と吸気３を良好に混合させることが可能となる。   As a result, the natural gas 7 and the intake air 3 are reduced within the intake pipe 6 as short as possible without taking measures such as elongating the intake pipe 6 with some bent portions interposed to promote the mixing of the natural gas 7. Can be mixed well.

特に本形態例の場合には、ガス供給ノズル８の上流側に直進部９が確保されているので、この直進部９により流れが安定して偏りが少なくなった吸気３に対し天然ガス７が噴射されて一層良好な混合が実現され、しかも、ガス供給ノズル８の先端が吸気パイプ６の軸心部付近に配置されているので、吸気３の流れが比較的安定している吸気パイプ６の軸心部付近に天然ガス７を噴射して偏りの少ない天然ガス７の分散を図ることが可能となる。   In particular, in the case of this embodiment, since the rectilinear portion 9 is secured on the upstream side of the gas supply nozzle 8, the natural gas 7 is supplied to the intake air 3 whose flow is stabilized and less biased by the rectilinear portion 9. Since the injection is performed to achieve better mixing and the tip of the gas supply nozzle 8 is disposed near the axial center of the intake pipe 6, the flow of the intake pipe 6 is relatively stable. It becomes possible to inject the natural gas 7 in the vicinity of the shaft center portion and to disperse the natural gas 7 with little bias.

また、本形態例では、吸気マニホールド２に沿い長手方向他端部側から一端部側へ導かれた吸気３が、吸気マニホールド２の他端部側へ向けて折り返されることになるので、もともと吸気３が偏って導かれ易かった吸気入口部４に近い気筒への吸気３の分配が抑制されると共に、吸気入口部４から遠い気筒への積極的な分配が促進され、全体として各気筒への吸気３の分配の均等化が図られる。   Further, in this embodiment, the intake air 3 guided from the other end side in the longitudinal direction along the intake manifold 2 to the one end side is folded back toward the other end side of the intake manifold 2. As a result, the distribution of the intake air 3 to the cylinders close to the intake air inlet portion 4 where the 3 is easily biased is suppressed, and the positive distribution to the cylinders far from the intake air inlet portion 4 is promoted. The distribution of the intake air 3 is equalized.

即ち、図２に示す如く、吸気マニホールド２の長手方向一端部に配置された吸気入口部４が、前記吸気マニホールド２の長手方向に対し略直角な向きから接続されていて、図１の如き折り返しの屈曲形状が全く付されていなかったならば、図２中に矢印の大きさで示す如く、吸気マニホールド２の長手方向一端部側に分配される吸気３が多くなる一方、吸気マニホールド２の長手方向他端部側に分配される吸気３は相対的に少なくなり、吸気入口部４から遠い気筒への吸気３の分配が少なくなってしまうことが懸念される。   That is, as shown in FIG. 2, the intake inlet portion 4 arranged at one end portion in the longitudinal direction of the intake manifold 2 is connected from a direction substantially perpendicular to the longitudinal direction of the intake manifold 2, and is folded as shown in FIG. 2 is not attached at all, as shown by the size of the arrow in FIG. 2, the intake air 3 distributed to one end side in the longitudinal direction of the intake manifold 2 increases, while the longitudinal direction of the intake manifold 2 increases. There is a concern that the intake air 3 distributed to the other end side in the direction is relatively small, and the distribution of the intake air 3 to the cylinder far from the intake inlet portion 4 is reduced.

これに対し、図３に示す如く、吸気入口部４に吸気３を吸気マニホールド２の他端部側へ向けて折り返す屈曲形状が付されていれば、吸気マニホールド２の他端部側へ向かう吸気３の流れが形成されるので、吸気マニホールド２の長手方向他端部側に分配される吸気３が図２の場合より多くなる一方、吸気マニホールド２の長手方向一端部側に分配される吸気３は相対的に少なくなり、結果的に各気筒への吸気３の分配が均等化されることになる。   On the other hand, as shown in FIG. 3, if the intake inlet 4 has a bent shape that turns the intake 3 back toward the other end of the intake manifold 2, the intake toward the other end of the intake manifold 2. 3 is formed, the intake 3 distributed to the other end in the longitudinal direction of the intake manifold 2 becomes larger than that in the case of FIG. 2, while the intake 3 distributed to the one end in the longitudinal direction of the intake manifold 2 is increased. Becomes relatively small, and as a result, the distribution of the intake air 3 to each cylinder is equalized.

従って、上記形態例によれば、ガス供給ノズル８による天然ガス７の噴射位置より下流側の吸気パイプ６や吸気マニホールド２の吸気入口部４を幾つかの屈曲部を介在させながら長尺化して天然ガス７の混合を促進させる等といった措置を採らなくても、吸気パイプ６や吸気入口部４から成る極力短い吸気流路内で天然ガス７と吸気３を良好に混合させることができるので、周辺構造物との干渉を招かない吸気流路のコンパクトなレイアウトを実現することができ、車両への搭載性を従来より大幅に向上することができる。   Therefore, according to the above embodiment, the intake pipe 6 and the intake inlet portion 4 of the intake manifold 2 on the downstream side of the injection position of the natural gas 7 by the gas supply nozzle 8 are elongated while interposing some bent portions. Without taking measures such as promoting the mixing of the natural gas 7, the natural gas 7 and the intake air 3 can be mixed well in the intake passage as short as possible consisting of the intake pipe 6 and the intake inlet portion 4. A compact layout of the intake flow path that does not cause interference with surrounding structures can be realized, and the mountability on the vehicle can be greatly improved as compared with the conventional one.

また、特に本形態例によれば、もともと吸気３が偏って導かれ易かった吸気入口部４に近い気筒への吸気３の分配を抑制し且つ吸気入口部４から遠い気筒への積極的な分配を促進することができるので、各気筒への吸気３の分配を均等化することができてエンジン性能の大幅な向上を図ることができる。   In particular, according to the present embodiment, the distribution of the intake air 3 to the cylinders close to the intake air inlet portion 4 where the intake air 3 was originally easily biased is suppressed, and the positive distribution to the cylinders far from the intake air inlet portion 4 is suppressed. Therefore, it is possible to equalize the distribution of the intake air 3 to the respective cylinders and to greatly improve the engine performance.

尚、本発明のガスエンジンは、上述の形態例にのみ限定されるものではなく、天然ガス以外のガス燃料を利用したものであっても良いこと、その他、本発明の要旨を逸脱しない範囲内において種々変更を加え得ることは勿論である。   The gas engine of the present invention is not limited to the above-described embodiment, and may be one using a gas fuel other than natural gas, and within the scope not departing from the gist of the present invention. Of course, various changes can be made.

本発明を実施する形態の一例を示す一部を切り欠いた平面図である。It is the top view which notched a part which shows an example of the form which implements this invention. 従来例における吸気の分配状態を模式的に示す図である。It is a figure which shows typically the distribution state of the intake air in a prior art example. 本形態例における吸気の分配状態を模式的に示す図である。It is a figure which shows typically the distribution state of the intake air in this example. 従来例を示す一部を切り欠いた平面図である。It is the top view which notched a part which shows a prior art example.

符号の説明Explanation of symbols

１ エンジン本体
２ 吸気マニホールド
３ 吸気
４ 吸気入口部（吸気流路）
５ スロットルバルブ
６ 吸気パイプ（吸気流路）
７ 天然ガス（ガス燃料）
８ ガス供給ノズル
９ 直進部 1 Engine body 2 Intake manifold 3 Intake 4 Intake inlet (intake flow path)
5 Throttle valve 6 Intake pipe (intake flow path)
7 Natural gas (gas fuel)
8 Gas supply nozzle 9 Straight section

Claims (3)

吸気マニホールドの吸気入口部に吸気の導入方向に対し該吸気の流れを折り返すような屈曲形状を付し、この吸気入口部より上流側にガス燃料を吸気の流れに対向して噴射するガス供給ノズルを設けると共に、該ガス供給ノズルの上流側にガス燃料の噴射方向に沿う所要長さの直進部を確保したことを特徴とするガスエンジン。 A gas supply nozzle that has a bent shape at the intake inlet portion of the intake manifold so that the flow of the intake air is turned back with respect to the intake introduction direction, and injects the gas fuel upstream of the intake inlet portion so as to oppose the intake air flow. the provided Rutotomoni, gas engine, characterized in that to ensure a straight portion of predetermined length along the direction of injection of fuel gas on the upstream side of the gas supply nozzles. 吸気入口部が吸気マニホールドの長手方向一端部に配置され且つ前記吸気入口部に吸気を導く吸気流路が前記吸気マニホールドに沿い長手方向他端部側から延在していることを特徴とする請求項１に記載のガスエンジン。   The intake passage is disposed at one end portion in the longitudinal direction of the intake manifold, and an intake passage that guides intake air to the intake inlet portion extends from the other end portion in the longitudinal direction along the intake manifold. Item 4. The gas engine according to Item 1. ガス供給ノズルの先端が吸気流路の軸心部付近に配置されていることを特徴とする請求項１又は２に記載のガスエンジン。 The gas engine according to claim 1 or 2, wherein the tip of the gas supply nozzle is disposed in the vicinity of the axial center of the intake passage .
JP2005256431A 2005-09-05 2005-09-05 Gas engine Expired - Fee Related JP4675191B2 (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10325366A (en) * 1997-05-27 1998-12-08 Aisan Ind Co Ltd Mounting method of injection valve for natural gas engine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10325366A (en) * 1997-05-27 1998-12-08 Aisan Ind Co Ltd Mounting method of injection valve for natural gas engine

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