Patent attributes
An internal transmission is basically arranged with a hub shaft which is attachable to a bicycle frame, a first shaft which is separate from the hub shaft and which is non-rotatable around the hub shaft, and a second shaft which is separate from the hub shaft and from the first shaft and which is non-rotatable around the hub shaft. The internal transmission has a plurality of first rotating bodies which are coaxially rotatable around the first shaft, and a plurality of second rotating bodies which are coupled to each of the first rotating bodies, and which are coaxially rotatable around the axis of the second shaft. The internal transmission has a clutch mechanism which controls at least one of the rotation state of the first rotating body and the rotation state of the second rotating body, and a hub shell which is rotated around the hub shaft.
