Hub assembly and drive train

A hub assembly for a human-powered vehicle, comprising:

• a hub axle;
• a first rotatable member rotatable relative to the hub axle about a rotational center axis;
• a second rotatable member rotatable relative to the hub axle and the first rotatable member about the rotational center axis;
• and
• a rotation control structure coupling the first rotatable member to the second rotatable member to transmit a first input rotation of the first rotatable member to the second rotatable member at a first ratio of a first output rotation of the second rotatable member to the first input rotation of the first rotatable member,
• the rotation control structure coupling the second rotatable member to the first rotatable member to transmit a second input rotation of the second rotatable member to the first rotatable member at a second ratio of a second output rotation of the first rotatable member to the second input rotation of the second rotatable member, the second ratio being larger than 0, the second ratio being smaller than 1.

A hub assembly for a human-powered vehicle, comprising:

• a hub axle;
• a first rotatable member rotatable relative to the hub axle about a rotational center axis, the first rotatable member including a sprocket engagement structure configured to engage with a plurality of sprockets;
• a second rotatable member rotatable relative to the hub axle and the first rotatable member about the rotational center axis;
• and
• a rotation control structure coupling the first rotatable member to the second rotatable member to transmit a first input rotation of the first rotatable member to the second rotatable member at a first ratio of a first output rotation of the second rotatable member to the first input rotation of the first rotatable member,
• the rotation control structure coupling the second rotatable member to the first rotatable member to transmit a second input rotation of the second rotatable member to the first rotatable member at a second ratio of a second output rotation of the first rotatable member to the second input rotation of the second rotatable member, the second ratio being different from the first ratio, the second ratio being larger than 0, wherein
• the first ratio is 1.

A hub assembly for a human-powered vehicle, comprising:

• a hub axle;
• a first rotatable member rotatable relative to the hub axle about a rotational center axis, the first rotatable member including a sprocket engagement structure configured to engage with a plurality of sprockets;
• a second rotatable member rotatable relative to the hub axle and the first rotatable member about the rotational center axis;
• and
• a rotation control structure coupling the first rotatable member to the second rotatable member to transmit a first input rotation of the first rotatable member to the second rotatable member at a first ratio of a first output rotation of the second rotatable member to the first input rotation of the first rotatable member,
• the rotation control structure coupling the second rotatable member to the first rotatable member to transmit a second input rotation of the second rotatable member to the first rotatable member at a second ratio of a second output rotation of the first rotatable member to the second input rotation of the second rotatable member, the second ratio being different from the first ratio, the second ratio being larger than 0, wherein
• the rotation control structure includes a first one-way clutch provided between the first rotatable member and the second rotatable member to transmit the first input rotation of the first rotatable member to the second rotatable member at the first ratio,
• the first one-way clutch is provided between the first rotatable member and the second rotatable member to restrict the first rotatable member to rotate relative to the second rotatable member about the rotational center axis in a first rotational direction, and
• the first one-way clutch is provided between the first rotatable member and the second rotatable member to allow the first rotatable member to rotate relative to the second rotatable member about the rotational center axis in a second rotational direction which is an opposite direction of the first rotational direction.

A hub assembly for a human-powered vehicle, comprising:

• a hub axle;
• a first rotatable member rotatable relative to the hub axle about a rotational center axis, the first rotatable member including a sprocket engagement structure configured to engage with a plurality of sprockets;
• a second rotatable member rotatable relative to the hub axle and the first rotatable member about the rotational center axis;
• and
• a rotation control structure coupling the first rotatable member to the second rotatable member to transmit a first input rotation of the first rotatable member to the second rotatable member at a first ratio of a first output rotation of the second rotatable member to the first input rotation of the first rotatable member,
• the rotation control structure coupling the second rotatable member to the first rotatable member to transmit a second input rotation of the second rotatable member to the first rotatable member at a second ratio of a second output rotation of the first rotatable member to the second input rotation of the second rotatable member, the second ratio being different from the first ratio, the second ratio being larger than 0, wherein
• the rotation control structure includes a first one-way clutch provided between the first rotatable member and the second rotatable member to transmit the first input rotation of the first rotatable member to the second rotatable member at the first ratio, and
• the first one-way clutch includes
• a first receiving surface provided at one of the first rotatable member and the second rotatable member, and
• a first contactable surface configured to contact the first receiving surface to transmit the first input rotation of the first rotatable member to the second rotatable member at the first ratio.

A hub assembly for a human-powered vehicle, comprising:

• a hub axle;
• a first rotatable member rotatable relative to the hub axle about a rotational center axis, the first rotatable member including a sprocket engagement structure configured to engage with a plurality of sprockets;
• a second rotatable member rotatable relative to the hub axle and the first rotatable member about the rotational center axis;
• and
• a rotation control structure coupling the first rotatable member to the second rotatable member to transmit a first input rotation of the first rotatable member to the second rotatable member at a first ratio of a first output rotation of the second rotatable member to the first input rotation of the first rotatable member,
• the rotation control structure coupling the second rotatable member to the first rotatable member to transmit a second input rotation of the second rotatable member to the first rotatable member at a second ratio of a second output rotation of the first rotatable member to the second input rotation of the second rotatable member, the second ratio being different from the first ratio, the second ratio being larger than 0, wherein
• the rotation control structure includes a ring gear, a sun gear, and at least one planetary gear engaged with the ring gear and the sun gear to transmit the second input rotation of the second rotatable member to the first rotatable member at the second ratio,
• the ring gear is rotatable relative to the hub axle, the first rotatable member, and the second rotatable member about the rotational center axis,
• the sun gear is coupled to the second rotatable member to rotate along with the second rotatable member relative to the hub axle and the first rotatable member,
• the at least one planetary gear is provided between the sun gear and the ring gear to transmit a rotation of the ring gear to the sun gear at the second ratio.

A hub assembly for a human-powered vehicle, comprising:

• a hub axle;
• a first rotatable member rotatable relative to the hub axle about a rotational center axis, the first rotatable member including a sprocket engagement structure configured to engage with a plurality of sprockets;
• a second rotatable member rotatable relative to the hub axle and the first rotatable member about the rotational center axis;
• and
• a rotation control structure coupling the first rotatable member to the second rotatable member to transmit a first input rotation of the first rotatable member to the second rotatable member at a first ratio of a first output rotation of the second rotatable member to the first input rotation of the first rotatable member,
• the rotation control structure coupling the second rotatable member to the first rotatable member to transmit a second input rotation of the second rotatable member to the first rotatable member at a second ratio of a second output rotation of the first rotatable member to the second input rotation of the second rotatable member, the second ratio being different from the first ratio, the second ratio being larger than 0, wherein
• the rotation control structure includes a ring gear, a sun gear, and at least one planetary gear engaged with the ring gear and the sun gear to transmit the second input rotation of the second rotatable member to the first rotatable member at the second ratio, and
• the at least one planetary gear is rotatably coupled to the first rotatable member.

A hub assembly for a human-powered vehicle,

• a hub axle;
• a first rotatable member rotatable relative to the hub axle about a rotational center axis, the first rotatable member including a sprocket engagement structure configured to engage with a plurality of sprockets;
• a second rotatable member rotatable relative to the hub axle and the first rotatable member about the rotational center axis;
• and
• a rotation control structure coupling the first rotatable member to the second rotatable member to transmit a first input rotation of the first rotatable member to the second rotatable member at a first ratio of a first output rotation of the second rotatable member to the first input rotation of the first rotatable member,
• the rotation control structure coupling the second rotatable member to the first rotatable member to transmit a second input rotation of the second rotatable member to the first rotatable member at a second ratio of a second output rotation of the first rotatable member to the second input rotation of the second rotatable member, the second ratio being different from the first ratio, the second ratio being larger than 0, wherein
• the second ratio is smaller than 0.5.