| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a drive device premised on a planetary gear system and structure supporting planetary gears by a spider in a cantilevered manner, in which energy loss is reduced by reducing agitation resistance caused by the planetary gear swimming through a lubricating oil during an operation. <P>SOLUTION: Protrusions 34 are formed on a gear attachment face of a spider 26 of a planetary gear mechanism 22, each of the protrusion being formed by protruding a portion interposed between the planetary gears 28, relatively in an axial direction with respect to the gear attachment portion. Each of the protrusions 34 is provided in such a manner that: an outer circumferential face of the protrusion in an arc shape coincide with an outer circumferential face of a spider body 35; the protrusion protrudes in the axial direction to a height approximately equal to the axial dimension of the planetary gears 28; faces of the protrusion opposing to the planetary gears 28 and the sun gear 24 are in an arc shape along outer circumferences of the respective gears; and a gap β that does not obstruct rotation of the gear is formed between the protrusion and the gear outer circumference. <P>COPYRIGHT: (C)2013,JPO&INPIT |
