| 摘要 |
PROBLEM TO BE SOLVED: To provide a planetary gear reduction device, in which durability of a bearing 18 is enhanced by improvement in lubricating structure of a planetary gear 19 with respect to the bearing 18.SOLUTION: An oil reservoir 27 formed by cutting an outer diameter of a planetary pin 17 within a predetermined range in a circumferential direction is provided on a non-load side of a planetary pin 17 rotatably supporting the planetary gear 19 through the bearing 18, that is, on the non-load side which is not in contact with the bearing 18 and to which any load in transmission of torque is not applied when rotation of a sun gear 15 is transmitted to the planetary gear 19. Since the oil reservoir 27 is formed to the planetary pin 17, lubrication of the bearing 18 is stably achieved for a long period of time, a proper amount of oil is appropriately supplied into a sliding clearance between the bearing 18 and the planetary pin 17 in torque transmission along with the rotation of the planetary gear 19. Therefore, durability of the bearing 18 is improved to elongate the service life. |
