| 摘要 |
PROBLEM TO BE SOLVED: To reduce in weight and cost and to provide a planetary gear with a precise bearing coating having a large load capacity by direct coating the inside hole of a gear with a specified bearing material. SOLUTION: A planetary gear 48 has a gear rim part 49, wherein a bearing material 50 is coated on the surface of the inside hole. Gear teeth 51 are positioned on the outer surface of a gear and supported on a pin 52. An oil film is positioned in a boundary 53 between the bearing material 50 and the pin 52. The bearing material 50 is formed by a mixture of at least one kind of an element selected from a group composed of copper, aluminum, silver and their mixtures and a balance material selected from a group composed of lead, tin, indium, antimony and their mixtures. Further, the material has a mixture of copper and lead, the lead content being 20 to 40 capacity %. Further, a coating having a thickness about 0.0016 to 0.0040 inch is formed, and a coating having a thickness from about 0.0030 to 0.0032 is formed.
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