BICYCLE TRANSMISSION APPARATUS

摘要

A bicycle transmission apparatus comprises a base member, an input shaft, a first transmission member, a second transmission member, and a first coupling member. The base member is configured to be attached to a bicycle frame as a separate member from the bicycle frame. The first transmission member is rotatable relative to the base member about a first rotational axis different from the input rotational axis. The second transmission member is rotatable relative to the base member about a second rotational axis different from each of the input rotational axis and the first rotational axis. The first coupling member is configured to couple the first transmission member to the second transmission member to transmit rotation of the first transmission member to the second transmission member at a variable speed stage.

主权项

1. A bicycle transmission apparatus comprising:
a base member configured to be attached to a bicycle frame as a separate member from the bicycle frame, the base member including an internal space; an input shaft mounted to the base member to receive an input torque and rotatable relative to the base member about an input rotational axis in response to the input torque; a first transmission member provided in the internal space of the base member and rotatable relative to the base member about a first rotational axis different from the input rotational axis; a second transmission member provided in the internal space of the base member and rotatable relative to the base member about a second rotational axis different from each of the input rotational axis and the first rotational axis; and a first coupling member having an annular shape to surround the first rotational axis and the second rotational axis when viewed from an axial direction parallel to the first rotational axis, the first coupling member being configured to couple the first transmission member to the second transmission member to transmit rotation of the first transmission member to the second transmission member at a variable speed stage, the variable speed stage being variable in accordance with at least one positional relationship among the first transmission member, the second transmission member, and the first coupling member in the axial direction.