| 摘要 |
The present invention relates to a multistage transmission, comprising: a center shaft arranged in a frame such that the center shaft does not rotate; an input member arranged coaxially to the center shaft such that the input member is rotatable; a hub arranged coaxially to the center shaft such that the hub is rotatable; a planetary gear assembly which is coupled to the input member and mounted on the hub, and which is arranged coaxially to the center shaft such that the planetary gear assembly is rotatable, and which has at least two pairs of planetary gears, wherein each of the planetary gears has a sun gear, a ring gear, a satellite carrier and a satellite gear; an axial clutch which is involved in the operation of the sun gear which is selectively coupled to or separated from at least one of the peripheral members; a clutch assembly in which at least one of the clutches in a rotating direction are arranged in correspondence with the respective sun gears, wherein said clutches in the rotating direction are involved in the operation of the sun gear which is selectively coupled to or separated from the center shaft; and a transmission shaft which has a hollow portion and a plurality of radial through-holes, and which covers the center shaft and rotates to select a rotating direction, and which is involved in the operation of the clutch assembly. The multistage transmission of the present invention provides two or more gear ratios between the input member and the hub in accordance with the rotating direction of the transmission shaft. |
