To provide a slide member capable of greatly reducing friction to a cam, and simplifying manufacturing processes in a valve mechanism for an automotive engine, for example.
This slide member of ceramic comprises a flat surface 1 in which micro-recesses D are roughly uniformly distributed, so that the flat surface 1 slides to a curved surface of a cylindrical member through lubricating oil. In a case with a load P, and Young's moduli E1 and E2 of the slide member and the cylindrical member respectively, for a synthesized Young's modulus E for the slide member and the cylindrical member represented by (1/E1+1/Es)-1, a radius r for the curved surface of the cylindrical member, and length l of a contact part of the slide member to the cylindrical member, diameter d of the micro-recess distributed roughly uniformly in the flat surface is set in a range of 1.0-2.5 times 2b determined by an expression of 2b=2x1.0764(Pr/El)1/2.
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YASUDA YOSHITERU