Multiple-cylinder internal combustion engine having cylinder head provided with centralized exhaust passageway

• Main Authors: WADA YUUSUKE, ASAME KOICHIRO
• Format: Patent
• Language: English
• Published: 14.12.2010
• Subjects: ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES; BLASTING; COMBUSTION ENGINES; COOLING OF INTERNAL-COMBUSTION ENGINES; COOLING OF MACHINES OR ENGINES IN GENERAL; CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ENGINE PLANTS IN GENERAL; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; STEAM ENGINES; WEAPONS

A cylinder head 2 for a multiple-cylinder internal combustion engine is provided with a centralized exhaust passageway E. The centralized exhaust passageway E includes individual exhaust passageways 51 to 54 connected to combustion chambers defined by recesses 11 to 14, and a central passageway 60 collecting the exhaust gas flowing through the individual exhaust passageways 51 to 54. Each of the exhaust passageways 51 to 54 has two branch passageways 21, 31; 22,32; 23,33; 24,34 extending from the exhaust ports Ea opened and closed by exhaust valves 6, and a merging passageway 41; 42; 43; 44 having one end connected to the two branch passageways. The respective passage diameters D1 to D4 of the merging passageways 41 to 44 are substantially equal to the passage diameters d1 to d4 of the branch passageways. The merging passageways 41 to 44 and the central collecting passageway 60 are surrounded with water jackets W1 and W2 from above and below. Thus exhaust gas cooling efficiency can be improved without enlarging the cylinder head provided with the centralized exhaust passage.