| 摘要 |
PROBLEM TO BE SOLVED: To provide a driving force distribution device with simple structure and facilitating size reduction. SOLUTION: A planetary gear mechanism 31 has a plurality of planetary gears 44 constituted by connecting first pinions 42 and second pinions 43 different in pitch circle diameter so as not to be relatively rotatable. A gear shifting mechanism 61 has a plurality of planetary gears 64 constituted by connecting third pinions 62 of which pitch diameter are the same as those of the first pinions 42, and fourth pinions 63 of which pitch diameter are the same as those of the second pinions 43. A first gear, a second gear, a third gear, and a fourth gear are meshed with the first pinions 42, the second pinions 43, the third pinions 62, and the fourth pinions 63, respectively, and all of the gears are constituted as ring gears (a first ring gear 51, a second ring gear 52, a third ring gear 71, and a fourth ring gear 72). COPYRIGHT: (C)2008,JPO&INPIT
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