| 摘要 |
An inner cylinder 5 supports and drives a hub shell 1. A sprocket hub 10 is rigidly mounted on one end of the cylinder, and may be integral with it. A bearing 2 at each end of the axle supports the cylinder and sprocket hub for rotation about th e axle 1. Outer bearings 16 between the cylinder and hub shell rotationally support th e hub shell. A circular ratchet 8 in the interior of the hub shell, and corresponding paw ls 6 on the exterior of the cylinder, drive the hub shell when torque is applied to the sprocket hub, and allow the shell to freewheel otherwise. A more central position of the pawl drive in the hub shell compare to prior designs reduces twist of the shell. Wide separation of the bearings supporting the sprocket hub and cylinder provide a highly stabl e sprocket hub. These features maximize transmission efficiency and reliability.</SDOAB >
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