| 摘要 |
A sliding structure for an automotive engine includes a sliding member with a sliding portion and a lubricant applied to the sliding portion so that the sliding portion can make sliding contact with a counterpart member via the lubricant. The sliding member is either of a piston ring, a piston pin, a cam lobe, a cam journal, a plain bearing, a rotary vane and a timing chain. The sliding portion has a base made of a steel or aluminum material and a hard carbon film formed on the base to coat the sliding portion. The hard carbon film has a thickness of 0.3 to 2.0 mum, a Knoop hardness of 1500 to 4500 kg/mm<SUP>2</SUP>, a surface roughness Ry (mum) satisfying the following equation: Ry<{(0.75-Hk/8000)xh+0.07/0.8}, where h is the thickness (mum) of the film; and Hk is the Knoop hardness (kg/mm<SUP>2</SUP>) of the film.
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