Patent ID: 8899949

Claim:
A refrigerant compressor comprising: a compression unit constructed and arranged to compress refrigerant used in a refrigeration cycle; a vane that is slidably provided in the compression unit, the vane comprising a base member made of metallic material; a film comprising sequentially layered first to fourth layers layered on the base member, wherein: the first layer is a single layer of chromium, the second layer is an alloyed layer of chromium and tungsten carbide, a content rate of chromium on a side facing the first layer is larger than on a side facing the third layer, and a content rate of tungsten carbide on the side facing the third layer is larger than on the side facing the first layer, the third layer is a metal-containing amorphous carbon layer comprising at least one of tungsten and tungsten carbide, and a content rate of the at least one of tungsten and tungsten carbide on a side facing the second layer is larger than on a side facing the fourth layer, and the fourth layer is an amorphous carbon layer comprising carbon and hydrogen and not comprising metal, and a thickness of the fourth layer is greater than a total thickness of the first to third layers; and a roller that is rotatably provided in the compression unit and slidably contacts with the vane at an end edge of the vane, the roller being made of flake graphite cast iron comprising molybdenum, nickel, and chromium.