Patent ID: 8575076

Claim:
A system comprising: a first sliding member which comprises a base body and a diamond-like carbon coating formed on the base body to define a sliding surface for sliding contact with a second sliding member under lubrication; a second sliding member which comprises a base body and a sliding surface for sliding contact with a first sliding member under lubrication, the sliding surface of the second sliding member comprising an iron-based material or an aluminum-based material; and a lubricant disposed between the first sliding member and the second sliding member, the lubricant being either (i) a lubricating oil comprising poly-α-olefin as a base oil and an ashless fatty-ester friction modifier, or (ii) a lubricating agent consisting of glycerol, wherein an outermost surface portion of the diamond-like carbon coating has a lower hydrogen content than that of a remaining portion of the diamond-like carbon coating.