| 摘要 |
PCT No. PCT/GB94/00394 Sec. 371 Date Dec. 26, 1995 Sec. 102(e) Date Dec. 26, 1995 PCT Filed Feb. 28, 1994 PCT Pub. No. WO94/20358 PCT Pub. Date Sep. 15, 1994An epicyclic change speed gear includes a fixed spindle, input and output members, planet pinions disposed in a planet cage, a gear ring which is operatively connected to one of the output member and input member, a clutch operative to connect the input member to one of the planet cage and input member to the gear ring, and axially moveable sun pinions which are resiliently loaded into abutting side-by-side disposition and are rotatable on the spindle. One of the sun pinions is operable to provide a reaction member when locked to the spindle. A gear selector key is disposed radially inwardly of the sun pinions and capable of engaging one of the sun pinions on movement of the selector key in the axial direction of the hub in order to lock the corresponding sun pinion to the spindle to provide the reaction member. The selector key includes a support rod, first and second body parts mounted on the rod for limited relative movement in the axial direction thereof, and a spring. The key further controls the operative condition of the clutch and thereby the connection of the input member to one of the planet cage and the gear ring.
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