| 摘要 |
PURPOSE:To minimize wear loss by setting up respective Moh's hardnesses, diameters, and volume percentages of a grain reinforcement and a solid lubricant in a composite material in the primary member to suitable ranges and also by constituting the sliding surface, of a secondary member, of a nitrided steel having specific hardness so as to provide superior wear resistance to both of the sliding surfaces. CONSTITUTION:The sliding surface part of a primary member is constituted of a composite material in which a mixture of a grain reinforcement of >=7 Moh's hardness, <=30mum diameter, and 3-45% volume percentage and a solid lubricant of 5-50% volume percentage selected from short fibers, grains, etc., of <=4.5 Moh's hardness and <=100mum diameter is used as reinforcement and an alloy composed principally of Al, Mg, Cu, Zn, Pb, and Sn is used as matrix. On the other hand, at least the sliding surface part, of the secondary member, which slides on the above primary member is constituted of a nitrided steel of >=550 hardness Hv(50kg). Moreover, it is desirable that any one of oxides, nitrides, and mixtures thereof is used as the solid lubricant.
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