| 摘要 |
A planetary transmission (10) is provided having planetary gear assemblies (2) and an unified outer, inner-toothed ring gear assembly (3). The planetary gear assembly (2) engages a sun gear (1) and is comprised of a planetary ring gear (7) sandwiched between front and back thrust discs (6a and 6b). The unified outer, inner-toothed ring gear assembly (3) engages the planetary gear assemblies (2) and is comprised of an outer, inner-toothed annular ring gear (8) part sandwiched between front and back side annular ring parts (9a and 9b). The thrust discs (6a and 6b) are in contact with the side annular ring parts (9a and 9b), and the contact surfaces are complementary. The thrust disc outer diameter (D1) is equal to or, preferably, greater than the planetary ring gear (8) tooth-tip circle diameter (D2). The side annular ring parts (9a and 9b) inner diameter (D3 ) is equal to or, preferably greater than the tooth-bottom circle diameter (D4) of the outer, inner-toothed ring gear (8). The complementary contact surfaces of the thrust discs (6a and 6b) and the side annular ring parts (9a and 9b) may be cylindrical or frustoconical. With frustoconical surfaces, the frustoconical angle ( alpha ) may be positive or negative.
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