| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive planetary gear device capable of extending the life of a pinion shaft by the action of needle rollers. SOLUTION: In this planetary gear device 10 rotatably supporting a pinion gear having the needle rollers disposed on the inner periphery thereof on the pinion shaft 15 fixed to a carrier 14, a residual austenite amount on the raceway surface 15a of the pinion shaft 15 is 15 to 40 vol.%. A steel having an Si content of 0.5 wt.% or more is used as the raw material of the needle rollers 15. After the raw material is carbonitrided and quenched, high temperature tempering is applied thereto. COPYRIGHT: (C)2006,JPO&NCIPI
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