| 摘要 |
The piston (3) has a piston head (12), which has a cooling channel (21) extending in a circumferential direction. An oil guiding unit is provided for guiding the oil discharged from an oil discharge port on an inner surface of a cylinder. The oil guiding unit is integrally provided in a cover. A pair of pin-carrying walls (13) is set from the opposite sides of the piston head. |
