| 摘要 |
PROBLEM TO BE SOLVED: To appropriately lubricate a planetary gear reduction gear mechanism by surely guiding hydraulic fluid flowing out of a hydraulic motor part into a housing of a reduction gear part. SOLUTION: An axial direction passage 34 is provided on a sun gear 32 composing a first stage planetary gear reduction gear mechanism 31. Hydraulic fluid flowing out of the hydraulic motor part 2 through a clearance 5D of a bearing 5 supporting a motor shaft 4 is guided into a reduction gear housing 7 through the axial direction passage 34 of the sun gear 32 and a clearance 33 between the sun gear 32 and a carrier 11. Consequently, hydraulic fluid flowing out of the hydraulic motor part 2 can be smoothly guided into the reduction gear housing 7 through the axial direction passage 34 provided on the sun gear, each planetary gear reduction gear mechanism 31, 15 is appropriately lubricated for a long time by the hydraulic fluid. COPYRIGHT: (C)2004,JPO
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