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    • 4. 发明公开
    • Cooling structure for internal combustion engine
    • 内燃机的冷却结构
    • EP2325469A1
    • 2011-05-25
    • EP10190417.5
    • 2010-11-09
    • Honda Motor Co., Ltd.
    • Hamakawa, TakeruSato, KenjiOkui, ShigeoKodama, Naoto
    • F02F1/14F01P3/02
    • F02F1/14F01P2003/021
    • A spacer (14) covers intermediate portions of respective cylinder bores (12a) in a depth direction of a water jacket (13) throughout the entire peripheries of the intermediate portions in the peripheral direction. Accordingly, the intermediate portion of each cylinder bore (12a) becomes higher in temperature than any other portion, and is thermally expanded. Thereby, the clearance between the cylinder bore (12a) and the corresponding piston (18) increases. Thus, the friction decreases to improve fuel efficiency of an internal combustion engine. Furthermore, since the temperature of oil lubricating the intermediate portion of the cylinder bore (12a) rises, and the viscosity decreases. Accordingly, the effect of friction reduction is enhanced more. Furthermore, upper and lower portions of the cylinder bores (12a) in a cylinder axis (L2) direction are sufficiently cooled. Therefore, the cooling performance of a top part and a skirt part of each piston (18), which tends to become higher in temperature, is secured. Accordingly, overheat can be prevented.
    • 间隔件(14)遍及中间部的外周方向的整个外周部沿水套(13)的深度方向覆盖各缸膛(12a)的中间部。 相应地,每个气缸孔(12a)的中间部分的温度比任何其他部分都高,并且热膨胀。 由此,气缸孔12a与对应的活塞18之间的间隙变大。 因此,摩擦降低以提高内燃机的燃料效率。 此外,由于润滑缸孔(12a)的中间部分的油的温度升高,并且粘度降低。 因此,摩擦减少的效果更强。 此外,气缸轴线(L2)方向上的气缸孔(12a)的上部和下部被充分冷却。 因此,确保了温度趋于升高的每个活塞(18)的顶部和裙部的冷却性能。 相应地,可以防止过热。