| 摘要 |
PROBLEM TO BE SOLVED: To provide a material of high abrasion resistance by the combination of ductile cast iron used in a crank shaft to which the power is to be applied, and a ferrous sintered bearing material for supporting the rotation of the crank shaft, in a coolant compressor for HFC coolant. SOLUTION: To provide a crank shaft 1 superior in the abrasion resistance, an area ratio of ferrite in a base of the ductile cast ion as a material to be applied, is adjusted to be at most 20%, and a size of spherical graphite for ensuring the slidability and the lubricity, is adjusted to be at least 30μm. The ferrous sintered material used in the upper and lower bearings for supporting the rotation of the crank shaft, is prepared by dispersing a hard phase of nickel(Ni) and molybdenum(Mo) to the base, or impregnating the base with the oil after the steam treatment, for preventing the impurity from remained in the sintered base texture, that is, the upper and lower bearings are formed by the components made of the material of high seizing resistance.
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