| 摘要 |
PURPOSE:To sufficiently secure the lubrication between a pinion shaft and a planetary gear by drilling an oil hole opened on the edge surface of the pinion shaft exposed to both the side plate sides and forming a radial groove which reaches to the opened port part of the oil hole between both the side plates, as for the joining between the first and the second carrier side plates opposed in the axial direction. CONSTITUTION:An oil plate 7 which is made of rubber and has a plurality of radial shaped oil grooves 71 is interposed between the side plates 41 and 51 on the inside of carriers 4 and 5, and the lubricating oil supplied from the oil hole Sa of a sun gear shaft S is supplied into the oil holes 24 and 34 on the pinion shafts 23 and 33 of the planetary gears 2 and 3 through the oil grooves 71. The diameter of the inner peripheral edge of the oil plate 7 is made slightly larger than the diameter of the inner peripheral edge of the side plate 41, 51, and the lubricating oil is introduced into the oil groove 71, guided by the inner peripheral edge of the side plates 41 and 51. Accordingly, the lubrication between the pinion shaft and the planetary gear can be carried out sufficiently with using a ring shaped thin plate which is installed in projection from the side plate of the carrier, and the dimension in the axial direction can be reduced.
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