| 摘要 |
A bicycle transmission of an internally mounted type, the transmission having a simple structure and capable of being universally installed on various bicycles. A rotating claw body (1) is fitted on a main shaft (51). Main gears (2, 3, 4, 5) corresponding to the number of shifts are arranged side by side on the outer periphery of the rotating claw body (1). An auxiliary shaft (6) is placed in parallel with the main shaft, and auxiliary gears (7, 8, 9, 10) individually functioning in operative association with the main gears at a predetermined speed ratio are co-rotatably supported by the auxiliary shaft (6). Ratchet claws (15, 16, 17, 18) individually corresponding to the main gears are arranged on the rotating claw body (1). Ratchet teeth (19) with which the ratchet claws engage are formed on the inner peripheral side of the main gears. When a switchover member (20) for causing the ratchet claws to project from and retract into the outer peripheral surface of the rotating claw body (1) is operated, a ratchet claw (15, 16, 17, 18) is engaged with and disengaged from the ratchet teeth (19) to switchover between the main gears (2, 3, 4, 5) that transmit drive power via auxiliary gears (7, 8, 9, 10). In this way, the speed ratio of rotation of the input side and output side is changed to shift gears.
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