COMBUSTION CHAMBER STRUCTURE FOR ENGINE

To provide a combustion chamber structure for an engine using SI combustion and SPCCI combustion in combination for maintaining both a tumble flow and a swirl flow until a late period for a compression stroke.SOLUTION: A combustion chamber of the engine enables the SPCCI combustion. A crown surface...

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Bibliographische Detailangaben
Hauptverfasser:	NISHI FUTA, HONDA YUYA, INOUE ATSUSHI, KONO MICHIHARU, IMAMURA SATOSHI, NAKAHARA KOJI, MATSUMOTO KOTA, FUKUMA MASANARI
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES BLASTING COMBUSTION ENGINES COMBUSTION ENGINES IN GENERAL CYLINDERS CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS INTERNAL-COMBUSTION PISTON ENGINES LIGHTING MECHANICAL ENGINEERING PISTONS SEALINGS THERMAL INSULATION IN GENERAL WEAPONS
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Beschreibung
Zusammenfassung:	To provide a combustion chamber structure for an engine using SI combustion and SPCCI combustion in combination for maintaining both a tumble flow and a swirl flow until a late period for a compression stroke.SOLUTION: A combustion chamber of the engine enables the SPCCI combustion. A crown surface 50 of a piston 5 includes a cavity 51 recessed in a bowl shape, an F side protruded part 52F and an R side protruded part 52R protruded in an outer periphery region of the cavity 51 in a cylinder axial direction and having a mountain shape along the pent roof shape of the ceiling surface of the combustion chamber, and an IN side slope part 55 protruded on a site perpendicular to the ridge line extending directions of the protruded parts. H1/H2 is set in a range of 1.79-3.29 where H1 is the height of each of the F side protruded part 52F and the R side protruded part 52R relative to the height position of a deepest portion 51B of the cavity 51, and H2 is the height of the IN side slope part 55.SELECTED DRAWING: Figure 12 【課題】ＳＩ燃焼とＳＰＣＣＩ燃焼とを併用する同エンジンにおいて、タンブル流及びスワール流の双方を圧縮行程後期まで維持する。【解決手段】エンジンの燃焼室は、ＳＰＣＣＩ燃焼が可能とされている。ピストン５の冠面５０には、椀状に凹設されてなるキャビティ５１と、キャビティ５１の外周領域において気筒軸方向に突設され、燃焼室天井面のペントルーフ形状に沿った山型形状を有するＦ側凸部５２Ｆ及びＲ側凸部５２Ｒと、これら凸部の稜線延在方向と直交する位置に突設されたＩＮ側斜面部５５とを備える。キャビティ５１の最深部５１Ｂの高さ位置に対するＦ側凸部５２Ｆ及びＲ側凸部５２Ｒの高さをＨ１、ＩＮ側斜面部５５の高さをＨ２とするとき、Ｈ１／Ｈ２が、１．７９以上３．２９以下の範囲に設定されている。【選択図】図１２