Bicycle hub gearbox

A bicycle hub gearbox comprising:

• a first planetary gear mechanism;
• a second planetary gear mechanism operatively coupled with the first planetary gear mechanism;
• a braking mechanism selectively coupled to the first planetary gear mechanism;
• and
• a clutch mechanism selectively coupling an output side of the first planetary gear mechanism to an input side of the second planetary gear mechanism to selectively transmit either a driving torque applied by a rider in a driving direction depending on a selected gear ratio or a braking torque applied by the rider in a braking direction to the braking mechanism independent of a selected gear ratio via one path,
• the clutch mechanism including
• a ring gear with ring teeth engaged with a planet gear of the first planetary gear mechanism, and a toothed ring arrangement that is offset in an axial direction from the ring teeth,
• a linking member having a part selectively connected to the second planetary gear mechanism, a first toothed ring part of the linking member selectively engaged with a first toothed ring part of the toothed ring arrangement of the ring gear, and a second toothed ring part on the output side of the clutch mechanism,
• a driving pawl and a braking pawl with the driving pawl and the braking pawl being disposed on an output side part of a planet gear carrier of the first planetary gear mechanism such that the driving pawl and the braking pawl selectively connect the planet gear carrier of the first planetary gear mechanism to the second toothed ring part of the linking member in a torque transferring manner,
• the driving pawl and the braking pawl being arranged in respective peripheral recesses at the output side part of the planet gear carrier of the first planetary gear mechanism and biased in a radial direction to engage the second toothed ring part of the linking member such that the driving pawl and the braking pawl are active in opposite rotational directions,
• the output side part of the planet gear carrier of the first planetary gear mechanism being operatively connected in a circumferential direction to the ring gear by using a ring spring,
• the input side part of the planet gear carrier of the first planetary gear mechanism serving as a rotatable driving member,
• the first toothed ring part of the ring gear having a plurality of recesses arranged in a circumferential direction, and
• the first toothed ring part of the linking member having a plurality of projections located in the recesses, with the recesses and the projections being configured with circumferential spacings therebetween to provide a limited range of relative circumferential rotation between the linking member and the ring gear.

A bicycle hub gearbox comprising:

• a first planetary gear mechanism;
• a second planetary gear mechanism operatively coupled with the first planetary gear mechanism;
• a braking mechanism selectively coupled to the first planetary gear mechanism;
• and
• a clutch mechanism selectively coupling an output side of the first planetary gear mechanism to an input side of the second planetary gear mechanism to selectively transmit either a driving torque applied by a rider in a driving direction depending on a selected gear ratio or a braking torque applied by the rider in a braking direction to the braking mechanism independent of a selected gear ratio via one path,
• the clutch mechanism including
• a ring gear with ring teeth engaged with a planet gear of the first planetary gear mechanism, a toothed ring arrangement that is offset in an axial direction from the ring teeth,
• a linking member having a part selectively connected to the second planetary gear mechanism,
• a first toothed ring part selectively engaged with a first toothed ring part of the toothed ring arrangement of the ring gear, and
• a second toothed ring part on the output side of the clutch mechanism,
• the first toothed ring part of the linking member of the ring gear having a plurality of recesses arranged in a circumferential direction, and the first toothed ring part of the linking member having a plurality of projections located in the recesses, with the recesses and the projections being configured with circumferential spacings therebetween to provide a limited range of relative circumferential rotation between the linking member and the ring gear.