| 摘要 |
PURPOSE:To prevent the abrasion of the addendums of a planetary gear by a method wherein a disc, having a larger diameter than the addendum circle of the planetary gear, and a ring, having a larger inner diameter than the deddendum circle of the outer shell gear thereof, are inscribed. CONSTITUTION:A planetary gear transmission device consists of a solar gear, a planetary gear and a fixed interval gear. The planetary gear 7 and the fixed internal gear 8 are being meshed. A pair of thrust discs 6, supporting the planetary gear 7 by a bearing, consists of an inside small circular part 18 and an outside large circular part 17. An outer shell ring 9 is formed integrally at the outside of the fixed internal gear 8 while the outer peripheral surface 20 of the outside large circular part 17 is contacting with the inner peeripheral surface 21 of the outer shell ring 9 each other to soften the affection of a centrifugal force. The diameter of the outside large circular part 17 is formed so as to be larger than the diameter of the addendum circle of the planetary gear 7, while the inner diameter of the outer shell ring 9 is formed so as to be larger than the diameter of the deddendum circle of the fixed internal gear 8. |
