JP7323008B2 - internal combustion engine - Google Patents

internal combustion engine Download PDF

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JP7323008B2
JP7323008B2 JP2022082852A JP2022082852A JP7323008B2 JP 7323008 B2 JP7323008 B2 JP 7323008B2 JP 2022082852 A JP2022082852 A JP 2022082852A JP 2022082852 A JP2022082852 A JP 2022082852A JP 7323008 B2 JP7323008 B2 JP 7323008B2
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chamber
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sub
spark plug
internal combustion
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JP2022105620A (en
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祥平 田村
亮 湯山
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Suzuki Motor Corp
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Suzuki Motor Corp
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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

Description

本発明は、内燃機関に関する。 The present invention relates to internal combustion engines.

従来、燃焼室に副室を備える内燃機関にあっては、特許文献１に記載のものが知られている。特許文献１に記載の内燃機関は、主たる燃焼室である主室と、主室と比して容積が小さく主室内と隣接して設けられた副室と、副室の壁面に主室と副室とを連通する連通路である噴孔と、副室内に点火時期を任意に設定可能な副室点火手段とを有している。 2. Description of the Related Art Conventionally, an internal combustion engine having a pre-chamber in a combustion chamber is known as disclosed in Patent Document 1. The internal combustion engine described in Patent Document 1 includes a main chamber that is a main combustion chamber, a sub chamber that is smaller in volume than the main chamber and is provided adjacent to the main chamber, and a main chamber and a sub chamber on the wall surface of the sub chamber. It has an injection hole, which is a communication passage communicating with the chamber, and a pre-chamber ignition means capable of arbitrarily setting the ignition timing in the pre-chamber.

また、特許文献１に記載の内燃機関は、主室に点火時期を任意に設定可能な主室点火手段と、副室点火手段および主室点火手段の点火時期を制御する点火時期制御手段とを備えており、運転条件に応じて点火時期制御手段によって、主室点火手段による主室点火の後に、副室点火手段による副室点火を行うように制御している。 Further, the internal combustion engine described in Patent Document 1 includes main chamber ignition means capable of arbitrarily setting ignition timing in the main chamber, and ignition timing control means for controlling the ignition timings of the pre-combustion chamber ignition means and the main chamber ignition means. The ignition timing control means controls the main chamber ignition by the main chamber ignition means and then the pre-chamber ignition by the pre-chamber ignition means according to the operating conditions.

これにより、一般に副室から噴出されるトーチ火炎の強度は、主室と副室との圧力差によって定まるが、特許文献１に記載の内燃機関は、運転条件に応じて副室点火前に主室点火を行うことで、主室内の圧力を上昇させることができ、運転条件に応じて最適な強度のトーチ火炎を得ることができる。 As a result, the intensity of the torch flame ejected from the pre-chamber is generally determined by the pressure difference between the main chamber and the pre-chamber. By igniting the chamber, the pressure in the main chamber can be increased, and a torch flame with optimum intensity can be obtained according to the operating conditions.

特開２００７－２５５３７０号公報JP 2007-255370 A

しかしながら、特許文献１に記載の内燃機関にあっては、主室の点火プラグと副室の点火プラグとが離れて配置されているため、副室の点火プラグからの燃え広がった火炎と主室の点火プラグから燃え広がった火炎とがぶつかり合って干渉してしまい、効率的に燃焼を行うことができないという問題があった。 However, in the internal combustion engine disclosed in Patent Document 1, the ignition plug of the main chamber and the ignition plug of the pre-combustion chamber are arranged apart from each other. There was a problem that the flames that spread from the spark plug collided and interfered with each other, preventing efficient combustion.

本発明は、上記のような問題点に着目してなされたものであり、火炎の干渉を抑制でき、効率的に燃焼を行うことができる内燃機関を提供することを目的とするものである。 SUMMARY OF THE INVENTION It is an object of the present invention to provide an internal combustion engine capable of suppressing flame interference and performing efficient combustion.

本発明に係る内燃機関は、主点火プラグが配置される主室と副点火プラグが配置される副室とからなる燃焼室を有する内燃機関であって、前記主室の中央の上部に、筒状の内筒部と、この内筒部の外周側に位置する筒状の外筒部とを備える副室部材が配置され、前記内筒部は、下方に向かって開口し、前記主点火プラグが前記内筒部に配置され、前記副室は前記内筒部と前記外筒部の間に環状に形成され、前記副室と前記主室とを連通する連通路を備え、前記連通路は、前記主室側の壁面に、シリンダ壁面に向かう放射方向に開口していることを特徴とする。 An internal combustion engine according to the present invention is an internal combustion engine having a combustion chamber consisting of a main chamber in which a main spark plug is arranged and a sub chamber in which a sub spark plug is arranged . A sub-chamber member having a cylindrical inner cylindrical portion and a cylindrical outer cylindrical portion positioned on the outer peripheral side of the inner cylindrical portion is arranged, and the inner cylindrical portion is open downward to accommodate the main ignition plug. is disposed in the inner cylindrical portion, and the auxiliary chamber is annularly formed between the inner cylindrical portion and the outer cylindrical portion, and has a communicating passage that communicates the auxiliary chamber and the main chamber , wherein the communicating passage is , the wall surface on the main chamber side is open in a radial direction toward the cylinder wall surface.

このように上記の本発明によれば、火炎の干渉を抑制でき、効率的に燃焼を行うことができる。 As described above, according to the present invention, flame interference can be suppressed, and combustion can be performed efficiently.

図１は、本発明の一実施例に係る内燃機関の燃焼室の縦断面図である。FIG. 1 is a longitudinal sectional view of a combustion chamber of an internal combustion engine according to one embodiment of the invention. 図２は、本発明の一実施例に係る内燃機関の燃焼室の横断面図である。FIG. 2 is a cross-sectional view of a combustion chamber of an internal combustion engine according to one embodiment of the invention. 図３は、本発明の一実施例に係る内燃機関の副室部材の縦断面図である。FIG. 3 is a vertical cross-sectional view of a pre-chamber member of an internal combustion engine according to one embodiment of the present invention. 図４は、本発明の一実施例に係る内燃機関の副室部材の横断面図である。FIG. 4 is a cross-sectional view of a pre-chamber member of an internal combustion engine according to one embodiment of the present invention. 図５は、本発明の一実施例に係る内燃機関の副室部材の底面図である。FIG. 5 is a bottom view of the pre-chamber member of the internal combustion engine according to one embodiment of the present invention.

本発明の一実施の形態に係る内燃機関は、主点火プラグが配置される主室と副点火プラグが配置される副室とからなる燃焼室を有する内燃機関であって、主室の中央の上部に主点火プラグが装着される円筒部を配置し、円筒部に近接して副室が配置され、副室と主室とを連通する連通路を備え、円筒部は、下方に向かって開口し、連通路は、主室側の壁面に、シリンダ壁面に向かう放射方向に開口していることを特徴とする。これにより、本発明の一実施の形態に係る内燃機関は、火炎の干渉を抑制でき、効率的に燃焼を行うことができる。 An internal combustion engine according to an embodiment of the present invention is an internal combustion engine having a combustion chamber consisting of a main chamber in which a main spark plug is arranged and a sub chamber in which a sub spark plug is arranged. A cylindrical portion to which a main spark plug is attached is arranged in the upper part, a pre-chamber is arranged in the vicinity of the cylindrical portion, and a communication passage is provided to communicate between the pre-chamber and the main chamber, and the cylindrical portion opens downward. The communication passage is characterized in that it opens in the wall surface on the side of the main chamber in the radial direction toward the cylinder wall surface. As a result, the internal combustion engine according to the embodiment of the present invention can suppress flame interference and perform combustion efficiently.

以下、図面を参照して、本発明の一実施例について詳細に説明する。図１～図５は本発明に係る内燃機関の一実施例を説明する図である。 An embodiment of the present invention will be described in detail below with reference to the drawings. 1 to 5 are diagrams for explaining an embodiment of an internal combustion engine according to the present invention.

図１、図２に示すように、本発明の一実施例に係る内燃機関１０は、シリンダブロック２０とシリンダヘッド３０とを備えている。シリンダブロック２０には円筒状のシリンダ２１が形成されており、このシリンダ２１にはピストン２２が設けられている。 As shown in FIGS. 1 and 2, an internal combustion engine 10 according to one embodiment of the present invention includes a cylinder block 20 and a cylinder head 30. As shown in FIG. A cylindrical cylinder 21 is formed in the cylinder block 20 and a piston 22 is provided in the cylinder 21 .

シリンダヘッド３０には、シリンダ２１の上方に燃焼室５０が形成されており、この燃焼室５０には、吸気ポート３４および排気ポート３５が連通している。シリンダヘッド３０は、吸気バルブ３６および排気バルブ３７を備えている。 A combustion chamber 50 is formed in the cylinder head 30 above the cylinder 21 , and an intake port 34 and an exhaust port 35 communicate with the combustion chamber 50 . The cylinder head 30 has an intake valve 36 and an exhaust valve 37 .

吸気バルブ３６は、燃焼室５０と吸気ポート３４の間を所定のタイミングで開閉する。排気バルブ３７は、燃焼室５０と排気ポート３５の間を所定のタイミングで開閉する。 The intake valve 36 opens and closes between the combustion chamber 50 and the intake port 34 at a predetermined timing. The exhaust valve 37 opens and closes between the combustion chamber 50 and the exhaust port 35 at predetermined timings.

この内燃機関１０は、不図示のコネクティングロッド、クランクシャフト等を備え、ピストン２２がシリンダ２１内を２往復する間に吸気行程、圧縮行程、膨張行程及び排気行程からなる一連の４行程を行い、圧縮行程及び膨張行程の間にガソリン等の混合気に点火を行う４サイクルの火花点火式内燃機関として構成されている。 The internal combustion engine 10 includes a connecting rod, a crankshaft and the like (not shown), and performs a series of four strokes consisting of an intake stroke, a compression stroke, an expansion stroke and an exhaust stroke while the piston 22 makes two reciprocations within the cylinder 21, It is constructed as a four-cycle spark ignition type internal combustion engine that ignites an air-fuel mixture such as gasoline between a compression stroke and an expansion stroke.

内燃機関１０は、図示しない車両に搭載されており、燃焼室５０で燃料と空気との混合気を燃焼させることによりピストンを往復動させ、コネクティングロッドを介してクランクシャフトを回転させることにより、車両を走行させる駆動力を発生するようになっている。 The internal combustion engine 10 is mounted on a vehicle (not shown), and burns a mixture of fuel and air in a combustion chamber 50 to reciprocate a piston and rotate a crankshaft via a connecting rod to rotate the vehicle. It is designed to generate a driving force to run the.

本実施例において、燃焼室５０は、主たる燃焼室である主室５１と、この主室５１と比較して容積が小さい副室５２とから構成されている。主室５１は、その上面が屋根形の円盤形状に形成されている。主室５１の上面はシリンダヘッド３０により構成されている。 In this embodiment, the combustion chamber 50 is composed of a main chamber 51 which is a main combustion chamber and an auxiliary chamber 52 having a smaller volume than the main chamber 51 . The main chamber 51 has a disk shape with a roof-shaped upper surface. The upper surface of the main chamber 51 is composed of the cylinder head 30 .

主室５１の中央の上部には主点火プラグ６１が配置されている。主点火プラグ６１の周囲には、環状（トーラス形状）の副室５２が形成されており、副室５２は、主室５１の中心部の上部に隣接している。副室５２には副点火プラグ６２が配置されている。 A main ignition plug 61 is arranged in the upper part of the center of the main chamber 51 . An annular (torus-shaped) sub-chamber 52 is formed around the main spark plug 61 , and the sub-chamber 52 is adjacent to the upper portion of the central portion of the main chamber 51 . A sub spark plug 62 is arranged in the sub chamber 52 .

詳しくは、内燃機関１０は、副室５２を形成する副室部材４０を備えている。この副室部材４０は、燃焼室５０の中央の上面において、シリンダヘッド３０に固定されている。副室部材４０の中央には、主点火プラグ６１が設けられている。また、副室部材４０における主点火プラグ６１の周囲には、副点火プラグ６２が一体的に設けられている。 Specifically, the internal combustion engine 10 includes a pre-chamber member 40 that forms a pre-chamber 52 . The sub chamber member 40 is fixed to the cylinder head 30 on the central upper surface of the combustion chamber 50 . A main ignition plug 61 is provided in the center of the sub chamber member 40 . A sub spark plug 62 is integrally provided around the main spark plug 61 in the sub chamber member 40 .

副室部材４０は、図３、図４、図５に示すように、筒状の内筒部４１と、この内筒部４１の外周側に位置する筒状の外筒部４２とを備えている。内筒部４１の内部空間は、主点火プラグ装着孔４４を構成している。主点火プラグ装着孔４４には、図１に示すように、主点火プラグ６１が装着されている。主点火プラグ６１の電極６１Ａは、燃焼室５０の主室５１に露出している。 As shown in FIGS. 3, 4, and 5, the auxiliary chamber member 40 includes a tubular inner tubular portion 41 and a tubular outer tubular portion 42 located on the outer peripheral side of the inner tubular portion 41. there is The internal space of the inner cylindrical portion 41 constitutes a main spark plug mounting hole 44 . A main spark plug 61 is mounted in the main spark plug mounting hole 44 as shown in FIG. The electrode 61A of the main spark plug 61 is exposed to the main chamber 51 of the combustion chamber 50. As shown in FIG.

図３、図４、図５において、内筒部４１と外筒部４２の間の環状の空間は、副室５２を構成している。副室５２には副点火プラグ６２が設けられている。副点火プラグ６２は、上下方向において主点火プラグ６１よりも上方に配置されており、副点火プラグ６２の電極６２Ａは、副室５２の上部に位置している。副点火プラグ６２は、副室部材４０に主点火プラグ６１と平行に取り付けられている。 3, 4, and 5, the annular space between the inner tubular portion 41 and the outer tubular portion 42 constitutes a pre-chamber 52. As shown in FIG. A sub ignition plug 62 is provided in the sub chamber 52 . The sub spark plug 62 is arranged above the main spark plug 61 in the vertical direction, and the electrode 62 A of the sub spark plug 62 is positioned above the sub chamber 52 . The sub spark plug 62 is attached to the sub chamber member 40 in parallel with the main spark plug 61 .

副室部材４０は、全体として半球形状の半球部４３を有しており、半球部４３は、内筒部４１および外筒部４２の下端に設けられており、副室５２を下方から塞いでいる。前述の主点火プラグ装着孔４４は半球部４３を貫通しており、主室５１に通じている。 The pre-chamber member 40 has a hemispherical hemispherical portion 43 as a whole. The semi-spherical portion 43 is provided at the lower ends of the inner cylindrical portion 41 and the outer cylindrical portion 42 and blocks the sub-chamber 52 from below. there is The aforementioned main spark plug mounting hole 44 penetrates the hemispherical portion 43 and communicates with the main chamber 51 .

半球部４３には、複数の連通路４６が設けられており、この連通路４６は、副室５２と主室５１とを連通している。副室部材４０はシリンダヘッド３０にねじ込み等により固定されている。 A plurality of communicating passages 46 are provided in the hemispherical portion 43 , and the communicating passages 46 communicate the auxiliary chamber 52 and the main chamber 51 . The sub chamber member 40 is fixed to the cylinder head 30 by screwing or the like.

連通路４６は、半球部４３の外面、すなわち主室５１側の壁面において、シリンダ２１の壁面に向かう放射方向に開口している。詳しくは、連通路４６は、主室５１側の壁面に、シリンダ２１の壁面に向かう放射方向に対して周方向に傾斜して開口している。 The communicating passage 46 opens radially toward the wall surface of the cylinder 21 on the outer surface of the hemispherical portion 43 , that is, the wall surface on the main chamber 51 side. More specifically, the communication passage 46 opens in the wall surface on the main chamber 51 side so as to be circumferentially inclined with respect to the radial direction toward the wall surface of the cylinder 21 .

連通路４６は、半球部４３の内面、すなわち副室５２側の壁面において、図４に矢印Ｃで示すように、主点火プラグ６１の中心に向かう放射方向に対して周方向に傾斜して開口している。 The communication passage 46 is opened on the inner surface of the hemispherical portion 43, that is, on the wall surface on the side of the pre-chamber 52 so as to be circumferentially inclined with respect to the radial direction toward the center of the main spark plug 61, as indicated by arrow C in FIG. are doing.

以上のように構成された本発明の実施例に係る内燃機関による動作について説明する。 The operation of the internal combustion engine according to the embodiment of the present invention configured as described above will be described.

内燃機関１０の圧縮行程時は、図４に示すように、副室５２には、連通路４６を通って混合気が流れ込む。連通路４６の副室５２側の開口部は、矢印Ｃで示すように、主点火プラグ６１（図２参照）の中心に向かう放射方向に対して周方向に傾斜して開口している。 During the compression stroke of the internal combustion engine 10, as shown in FIG. The opening of the communication passage 46 on the auxiliary chamber 52 side is, as indicated by arrow C, inclined in the circumferential direction with respect to the radial direction toward the center of the main spark plug 61 (see FIG. 2).

このため、圧縮行程時に副室５２に流れ込んだ混合気は、矢印Ｄで示すように、環状の副室５２内を旋回する旋回流を形成する。その後、内燃機関１０の燃焼行程の開始までに、燃焼室５０の主室５１および副室５２は、空気と燃焼の混合気により充填される。 Therefore, the air-fuel mixture that has flowed into the pre-chamber 52 during the compression stroke forms a swirling flow in the ring-shaped sub-chamber 52 as indicated by an arrow D. Thereafter, by the start of the combustion stroke of internal combustion engine 10, main chamber 51 and auxiliary chamber 52 of combustion chamber 50 are filled with a mixture of air and combustion.

内燃機関１０の燃焼行程時は、図１、図３に示すように、主点火プラグ６１の点火により主室５１内で生じた火炎は、矢印Ａで示すように主に下方へ向かって伝播する。一方、副室５２内で副点火プラグ６２の点火により生じた火炎は、矢印Ｂで示すように連通路４６の開口から噴射され、シリンダ２１（図１参照）の壁面に向かって伝播する。 During the combustion process of the internal combustion engine 10, as shown in FIGS. 1 and 3, the flame generated in the main chamber 51 by the ignition of the main spark plug 61 propagates mainly downward as indicated by arrow A. . On the other hand, the flame generated in the auxiliary chamber 52 by the ignition of the auxiliary ignition plug 62 is injected from the opening of the communication passage 46 as indicated by arrow B and propagates toward the wall surface of the cylinder 21 (see FIG. 1).

詳しくは、図５に矢印Ｂで示すように、副室５２内で副点火プラグ６２の点火により生じた火炎は、シリンダ２１（図１参照）の壁面に向かう放射方向に対して周方向に傾斜する方向に伝搬する。 Specifically, as indicated by arrow B in FIG. 5, the flame generated by the ignition of the auxiliary spark plug 62 in the auxiliary chamber 52 is inclined in the circumferential direction with respect to the radial direction toward the wall surface of the cylinder 21 (see FIG. 1). propagate in the direction

以上説明したように、本実施例では、主室５１の中央の上部に主点火プラグ６１を配置し、主点火プラグ６１の周囲に副室５２を環状に形成し、副室５２に副点火プラグ６２を配置した。 As described above, in this embodiment, the main ignition plug 61 is arranged in the upper part of the center of the main chamber 51, the auxiliary chamber 52 is annularly formed around the main ignition plug 61, and the auxiliary ignition plug is formed in the auxiliary chamber 52. 62 were placed.

これにより、主点火プラグ６１と副点火プラグ６２とが近接して配置されるので、火炎の干渉を抑制でき、効率的に燃焼を行うことができる。 As a result, the main spark plug 61 and the sub spark plug 62 are arranged close to each other, so flame interference can be suppressed and combustion can be performed efficiently.

また、本実施例では、内燃機関１０は、副室５２と主室５１とを連通する連通路４６を備え、連通路４６は、主室５１側の壁面に、シリンダ２１の壁面に向かう放射方向に開口している。 In this embodiment, the internal combustion engine 10 also includes a communication passage 46 that communicates the auxiliary chamber 52 and the main chamber 51 . is open to

これにより、副室５２内の副点火プラグ６２の点火により発生した火炎を、連通路４６から主室５１のシリンダ２１の壁面方向に噴射することができる。また、副室５２の直下の混合気を主点火プラグ６１により点火することができる。このため、燃焼初期の火炎核を大きくすることができ、燃焼速度を向上させることができる。 As a result, the flame generated by the ignition of the auxiliary spark plug 62 in the auxiliary chamber 52 can be injected from the communication passage 46 toward the wall surface of the cylinder 21 of the main chamber 51 . Also, the air-fuel mixture immediately below the pre-chamber 52 can be ignited by the main ignition plug 61 . Therefore, the flame kernel at the initial stage of combustion can be enlarged, and the combustion speed can be improved.

また、本実施例では、連通路４６は、主室５１側の壁面に、シリンダ２１の壁面に向かう放射方向に対して周方向に傾斜して開口している。 In this embodiment, the communication passage 46 is opened in the wall surface of the main chamber 51 so as to be inclined in the circumferential direction with respect to the radial direction toward the wall surface of the cylinder 21 .

これにより、副室５２内の副点火プラグ６２の点火により発生した火炎を、連通路４６から主室５１のシリンダ２１の壁面方向かつ周方向に噴射することができる。このため、燃焼行程時に主室５１内に旋回流を発生させることができ、効率的に燃焼を行うことができる。 As a result, the flame generated by the ignition of the auxiliary spark plug 62 in the auxiliary chamber 52 can be injected from the communication passage 46 in the wall surface direction and the circumferential direction of the cylinder 21 in the main chamber 51 . Therefore, a swirling flow can be generated in the main chamber 51 during the combustion stroke, and efficient combustion can be achieved.

また、本実施例では、連通路４６は、副室５２側の壁面に、主点火プラグ６１の中心に向かう放射方向に対して周方向に傾斜して開口している。 In this embodiment, the communication passage 46 opens in the wall surface on the side of the auxiliary chamber 52 so as to be circumferentially inclined with respect to the radial direction toward the center of the main spark plug 61 .

これにより、圧縮行程時に、副室５２内に混合気の旋回流を発生させることができる。このため、副室５２内に混合気を取り込み易くなる。また、副室５２内の掃気性能を向上させることができる。 As a result, a swirl flow of the air-fuel mixture can be generated in the pre-chamber 52 during the compression stroke. Therefore, it becomes easier to take the air-fuel mixture into the auxiliary chamber 52 . Moreover, the scavenging performance in the sub chamber 52 can be improved.

また、本実施例では、内燃機関１０は、副室５２を形成する副室部材４０を備え、副室部材４０の中央に主点火プラグ６１を設け、副室部材４０における主点火プラグ６１の周囲に副点火プラグ６２を一体的に設けた。 Further, in this embodiment, the internal combustion engine 10 includes a sub-chamber member 40 forming a sub-chamber 52 , a main ignition plug 61 is provided in the center of the sub-chamber member 40 , and a main spark plug 61 is provided in the sub-chamber member 40 around the main spark plug 61 . A secondary spark plug 62 is provided integrally.

これにより、主点火プラグ６１と副点火プラグ６２との両方を副室部材４０に一体的に設けることができるので、副点火プラグ６２用の設置箇所を新たに増設することを不要にできる。製造コストを低減できる。 As a result, since both the main spark plug 61 and the sub spark plug 62 can be provided integrally with the sub chamber member 40, it is not necessary to newly add an installation location for the sub spark plug 62. Manufacturing costs can be reduced.

また、副室部材４０を取り外すことにより、主点火プラグ６１と副点火プラグ６２との両方が交換可能であるため、主点火プラグ６１及び副点火プラグ６２の交換作業を容易に行うことができ、整備性を向上させることができる。 Moreover, since both the main spark plug 61 and the sub spark plug 62 can be replaced by removing the sub chamber member 40, the replacement work of the main spark plug 61 and the sub spark plug 62 can be easily performed. Maintainability can be improved.

また、本実施例では、副室部材４０は、主室５１の上面を構成するシリンダヘッド３０に設けられ、副点火プラグ６２は、副室部材４０に主点火プラグ６１と平行に取り付けられている。 Further, in this embodiment, the sub chamber member 40 is provided in the cylinder head 30 forming the upper surface of the main chamber 51, and the sub spark plug 62 is attached to the sub chamber member 40 parallel to the main spark plug 61. .

これにより、シリンダヘッド３０における吸気バルブ３６と排気バルブ３７とに挟まれた狭い部位に、副室部材４０により副室５２を構成でき、かつ、主点火プラグ６１と副点火プラグ６２との両方をコンパクトに配置することができる。 As a result, the sub-chamber 52 can be configured by the sub-chamber member 40 in a narrow portion sandwiched between the intake valve 36 and the exhaust valve 37 in the cylinder head 30, and both the main spark plug 61 and the sub-spark plug 62 can be formed. It can be arranged compactly.

本発明の実施例を開示したが、当業者によっては本発明の範囲を逸脱することなく変更が加えられうることは明白である。すべてのこのような修正及び等価物が次の請求項に含まれることが意図されている。 Although embodiments of the present invention have been disclosed, it will be apparent that modifications may be made by those skilled in the art without departing from the scope of the invention. All such modifications and equivalents are intended to be included in the following claims.

１０ 内燃機関
３０ シリンダヘッド
４０ 副室部材
４６ 連通路
５０ 燃焼室
５１ 主室
５２ 副室
６１ 主点火プラグ
６２ 副点火プラグ 10 Internal combustion engine 30 Cylinder head 40 Sub chamber member 46 Communication passage 50 Combustion chamber 51 Main chamber 52 Sub chamber 61 Main spark plug 62 Sub spark plug

Claims (5)

主点火プラグが配置される主室と副点火プラグが配置される副室とからなる燃焼室を有する内燃機関であって、
前記主室の中央の上部に、筒状の内筒部と、この内筒部の外周側に位置する筒状の外筒部とを備える副室部材が配置され、
前記内筒部は、下方に向かって開口し、
前記主点火プラグが前記内筒部に配置され、
前記副室は前記内筒部と前記外筒部の間に環状に形成され、
前記副室と前記主室とを連通する連通路を備え、
前記連通路は、前記主室側の壁面に、シリンダ壁面に向かう放射方向に開口していることを特徴とする内燃機関。 An internal combustion engine having a combustion chamber consisting of a main chamber in which a main spark plug is arranged and a sub chamber in which a sub spark plug is arranged,
A sub-chamber member having a cylindrical inner cylindrical portion and a cylindrical outer cylindrical portion located on the outer peripheral side of the inner cylindrical portion is disposed in the upper center of the main chamber,
The inner cylindrical portion opens downward,
The main spark plug is arranged in the inner cylindrical portion,
The auxiliary chamber is annularly formed between the inner cylinder portion and the outer cylinder portion,
comprising a communication passage that communicates the sub-chamber and the main chamber ;
1. An internal combustion engine, wherein said communication passage opens in a wall surface on the side of said main chamber in a radial direction toward a cylinder wall surface. 前記連通路は、前記主室側の壁面に、前記シリンダ壁面に向かう放射方向に対して周方向に傾斜して開口していることを特徴とする請求項１に記載の内燃機関。 2. The internal combustion engine according to claim 1, wherein the communication passage opens in the wall surface on the main chamber side so as to be inclined in the circumferential direction with respect to the radial direction toward the cylinder wall surface. 前記副室部材における前記内筒部の周囲に前記副点火プラグを一体的に設けたことを特徴とする請求項１に記載の内燃機関。 2. The internal combustion engine according to claim 1, wherein the auxiliary spark plug is provided integrally around the inner cylindrical portion of the auxiliary chamber member. 前記副室部材は、前記主室の上面を構成するシリンダヘッドに設けられ、
前記副点火プラグは、前記副室部材に前記主点火プラグと平行に取り付けられていることを特徴とする請求項３に記載の内燃機関。 The sub chamber member is provided in a cylinder head that constitutes an upper surface of the main chamber,
4. The internal combustion engine according to claim 3, wherein the sub spark plug is attached to the sub chamber member in parallel with the main spark plug. 前記連通路は、前記副室側の壁面に、前記主点火プラグの中心に向かう放射方向に対して周方向に傾斜して開口していることを特徴とする請求項３に記載の内燃機関。 4. The internal combustion engine according to claim 3, wherein the communication passage opens in the wall surface on the side of the auxiliary chamber so as to be inclined in the circumferential direction with respect to the radial direction toward the center of the main spark plug.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001182538A (en) 1999-12-24 2001-07-06 Osaka Gas Co Ltd Engine
JP2007239603A (en) 2006-03-08 2007-09-20 Nissan Motor Co Ltd Variable compression ratio engine
JP2007255370A (en) 2006-03-24 2007-10-04 Nissan Motor Co Ltd Sub-chamber type internal combustion engine

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Publication number Priority date Publication date Assignee Title
JPS5446905U (en) * 1977-09-08 1979-03-31
JPS57140517A (en) * 1981-02-24 1982-08-31 Nissan Motor Co Ltd Spark-ignition engine with sub-chamber

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001182538A (en) 1999-12-24 2001-07-06 Osaka Gas Co Ltd Engine
JP2007239603A (en) 2006-03-08 2007-09-20 Nissan Motor Co Ltd Variable compression ratio engine
JP2007255370A (en) 2006-03-24 2007-10-04 Nissan Motor Co Ltd Sub-chamber type internal combustion engine

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