MULTICYLINDER INTERNAL COMBUSTION ENGINE

• Main Authors: NAKATA YOSUKE, MIMODA WATARU
• Format: Patent
• Language: English; Japanese
• Published: 13.09.2018
• 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

PROBLEM TO BE SOLVED: To surely cool an exhaust-side area in an intermediate bore portion of a cylinder head, in a three or more multi-cylinder, exhaust manifold built-in type internal combustion engine.SOLUTION: An exhaust-side lower main head jacket 17 extending along a bore row, and an exhaust-side intermediate portion head jacket 18 positioned on a part of an intermediate bore portion corresponding to an intermediate cylinder bore 2b are formed at a lower portion of an exhaust port of a cylinder head 11. The exhaust-side intermediate portion head jacket 18 is communicated to an intake-side head jacket 20 through front and back bore communication passages 19. The intermediate bore portion and an exhaust-side flow channel of a block jacket 4 are communicated by a leak passage 25. As cooling water of low temperature flows into the exhaust-side intermediate portion head jacket 18 from the block jacket 4, and smoothly flows without stagnation, the exhaust side area of the part of the intermediate bore portion of highest temperature can be surely cooled.SELECTED DRAWING: Figure 4 【課題】３気筒以上の多気筒でかつ排気マニホールド内蔵式の内燃機関において、シリンダヘッドのうち中間ボア部における排気側エリアの冷却を確実化する。【解決手段】シリンダヘッド１１のうち排気ポートの下方部には、ボア列に沿って長く延びる排気側下部メインヘッドジャケット１７と、中間シリンダボア２ｂに対応した中間ボア部の箇所に位置した排気側中間部ヘッドジャケット１８とが形成されている。排気側中間部ヘッドジャケット１８は、前後のボア間連通路１９を介して吸気側ヘッドジャケット２０に連通している。中間ボア部とブロックジャケット４の排気側流路とは、リーク通路２５によって連通している。ブロックジャケット４から低温の冷却水が排気側中間部ヘッドジャケット１８に流入、淀みなくスムースに流れるため、最も高温になる中間ボア部の箇所の排気側エリアを的確に冷却できる。【選択図】図４