| 摘要 |
PROBLEM TO BE SOLVED: To provide a piston for an internal combustion engine which can efficiently collect misty oil from a blow-by gas ejected from an oil return hole.SOLUTION: An oil separator 30 for liquefying and separating an oil from a blow-by gas ejected from an inside opening 22b is arranged in a space at the side of an internal peripheral face 3a of a piston 3. Furthermore, the oil separator 30 has a plate-shaped collision plate 31 which is arranged in the space at the side of the internal peripheral face 3a of the piston 3, vertically extends with respect to the inside opening 22b, is arranged so as to be apart from the inside opening 22b with a prescribed interval, and defines an air-liquid separation chamber 32 between the internal peripheral face 3a of the piston 3 and itself, and an opening 33 opened downwardly at the lower part of the air-liquid separation chamber 32. Furthermore, at the upstream side of a blow-by gas passage direction of the opening 33 in the air-liquid separation chamber 32, the oil separator 30 has a labyrinth mechanism 37 which is composed of a plurality of partitioning plates 34, 35 and 36 and elongating a passage of the blow-by gas. |
