| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a planetary gearing which prevents the wear or seizure of a pinion gear and a carrier, and besides has fewer parts, simplified structure, and fewer assembly labor hours. <P>SOLUTION: The pinion gear 14 is rotatably supported, through a needle roller 15, on the peripheral surface of a pinion shaft 13 fixed between a pair of carriers 11, 11. A single washer 16 is interposed between the end surfaces of the pinion gear 14 and needle roller 15 and the surfaces of the carriers 11. A dynamic pressure groove 17 is formed in the surface of the washer 16. In the movement of the planetary gearing, even when a thrust load is applied to the pinion gear 14 and carriers 11, the pinion gear 14 and the carriers 11, and the washer 16 are separated from each other and prevented from being brought in contact with each other by dynamic pressure action generated in lubricating oil by the dynamic pressure groove 17 of the washer 16, thereby preventing wear or seizure. Since the number of the washers 16 is reduced, the numbers of parts and assembly labor hours are reduced. <P>COPYRIGHT: (C)2009,JPO&INPIT |
