| 摘要 |
PROBLEM TO BE SOLVED: To provide a planetary gear device having reduced manufacturing cost for transmitting high torque. SOLUTION: A first planetary gear shaft 5a, a first carrier 4a and a second sun gear shaft 3b are integrally formed of sintered metal and a first planetary gear 6a is also formed of sintered metal to reduce manufacturing cost. A first sleeve 7a of a non-porous material is inserted between a bearing hole of the first planetary gear 6a and the first planetary gear shaft 5a to reduce friction and wear due to the rotation of the first planetary gear shaft 5a in contact with the bearing hole of the first planetary gear 6a of a porous material as a result of the runout of a lubricating oil film. COPYRIGHT: (C)2008,JPO&INPIT
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