| 摘要 |
PROBLEM TO BE SOLVED: To realize structure capable of reducing friction between the inner and the outer peripheral surfaces of a holder 51 structuring a radial needle bearing 31a for rotatably supporting a planetary gear 28 around a planetary shaft 25, the peripheral surface of the planetary shaft 25 and the inner peripheral surface of the planetary gear 28. SOLUTION: Circumferential side surfaces of a plurality of support parts 53 and 53 structuring the holder 51 are inclined against the radial direction of the holder 51. Flow of the lubricating oil toward the outer peripheral surface of the planetary shaft 25 is generated with rotation of the holder 51 to float the holder 51 in the radial direction. As a result, contact between the inner and the outer peripheral surfaces of the holder 51, the outer peripheral surface of the planetary shaft 25 and the inner peripheral surface of the planetary gear 28 can be prevented. COPYRIGHT: (C)2006,JPO&NCIPI
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