COMBUSTION CHAMBER STRUCTURE FOR ENGINE

To provide a combustion chamber structure for an engine, capable of securing high ignitability of air-fuel mixture by ensuring air scavenging near a combustion chamber ceiling surface.SOLUTION: The crown surface of a piston 5 is provided with a cavity 51 recessed in a cylinder axial direction. The c...

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Main Authors HONDA YUYA, INOUE ATSUSHI, KONO MICHIHARU, UEKI YOSHIHARU, IMAMURA SATOSHI, NAKAHARA KOJI, ONISHI KENTO, MATSUMOTO KOTA, FUKUMA MASANARI
Format Patent
LanguageEnglish
Japanese
Published 23.05.2019
Subjects
ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
BLASTING
COMBUSTION ENGINES
COMBUSTION ENGINES IN GENERAL
CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES
HEATING
HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
IGNITION, OTHER THAN COMPRESSION IGNITION, FORINTERNAL-COMBUSTION ENGINES
INTERNAL-COMBUSTION PISTON ENGINES
LIGHTING
MECHANICAL ENGINEERING
TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
WEAPONS
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Summary:To provide a combustion chamber structure for an engine, capable of securing high ignitability of air-fuel mixture by ensuring air scavenging near a combustion chamber ceiling surface.SOLUTION: The crown surface of a piston 5 is provided with a cavity 51 recessed in a cylinder axial direction. The cavity 51 is provided in a region including a lower area of an ignition part 170 of a spark plug 17 in plan view from the cylinder axial direction. On the crown surface of the piston 5 at its outer periphery portion on a +Y side with respect to the cavity 51, an intake side slope part 55 and an intake side plane part 53 are provided continuously with each other. The intake side plane part 53 is oppositely arranged with a gap from a plane part 43a of an intake side top surface part 43 opposed to a +Z side thereof. The intake side plane part 53 and the plane part 43a constitute a squish flow generation part. The intake side slope part 55 is provided so as to be oriented to the ignition part 170 of the spark plug 17 when the piston is at a compression top dead center.SELECTED DRAWING: Figure 8 【課題】燃焼室天井面付近の掃気が確実になされ、混合気の高い着火性を確保することができるエンジンの燃焼室構造を提供する。【解決手段】ピストン５の冠面は、気筒軸方向に凹設されてなるキャビティ５１を有する。キャビティ５１は、気筒軸方向からの平面視で点火プラグ１７の着火部１７０の下方を含む領域に設けられている。ピストン５の冠面において、キャビティ５１に対して＋Ｙ側の外周部分には、吸気側斜面部５５と吸気側平面部５３とが互いに連続して設けられている。吸気側平面部５３は、その＋Ｚ側に対向する吸気側天面部４３の平面部４３ａに対して隙間を空けて対向配置されている。吸気側平面部５３と平面部４３ａとは、スキッシュ流生成部を構成する。吸気側斜面部５５は、ピストンが圧縮上死点にあるときに点火プラグ１７の着火部１７０を指向するように設けられている。【選択図】図８
Bibliography:Application Number: JP20170205151