| 摘要 |
A directional gear ratio transmission which transfers all clockwise inputs at a gear ratio different from all counter clockwise inputs. A transmission housing 10 encloses first and second epicyclic gear assemblies, 20 and 60, which are controlled by first and second undirectional clutches, 90 and 95, and has a first shaft 11 and a second shaft 12 extending therefrom. Within the first epicyclic gear assembly 20 is a first sun gear 21 connected to the first shaft 11. First planet gears, 24, 25 and 26, mesh with the first sun gear 21and are held symmetrically about the first sun gear by a first planet gear carrier 36. A first ring gear 33 surrounds, and is also in mesh with the first planet gears 24, 25 and 26. Within the second epicyclic gear assembly 60 is a second sun gear 61 interconnected with the first planet gear carrier 36, by a connecting shaft 50. Second planet gears, 64, 65 and 66, mesh with the second sun gear 61 and are held symmetrically about the second sun gear by second planet gear carrier 76 which is connected to the first ring gear 33, by a connecting portion 51. Surrounding and in mesh with the second planet gears is a second ring gear 73 which is connected to the second shaft 12. First and second unidirectional clutches, 90 and 95, only allow rotation of the first planet gear carrier 36, and the first ring gear 33 in a common direction with respect to the transmission housing 10. This transmission inherently reverses all inputs to either the first or second shafts, and transmits all clockwise inputs to either shaft at a gear ratio different from all counterclockwise inputs.
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