The piston skirt which possesses the friction decrease oil escaping and the oil accumulating

摘要

The piston (20), vertical axis (L) paralleling, the extending being present, the outside of the convex form of 1 pair at the same time it opposes mutually (42) the piston skirt which it possesses (30) it includes. The outside (42) each the oil accumulating (44) from the oil escaping where interval is placed (46) with includes the pin bore axis (P) the oil accumulating of the upper part (44) with, the pin bore axis (P), the inclusion oil spread territory of the lower part (48) due to. The oil accumulating (44) and the oil escaping (46) each the outside (42) spreads to the territory, the bottom which is surrounded at the same time the inclined side wall (52) by (50) includes. The oil escaping (46) and the oil accumulating (44), the outside (42) with in the movement section, and bottom (50), the angular section which has roundness (54) it possesses, the oil accumulating (44), the oil escaping (46), or the outside (42) there is no sharp edge or angular section with this.