Bicycle assist unit
AssigneeShimano Inc.
InventorsHioryuki URABE, Tetsuya HINO, Takashi YAMAMOTO
Life of this patent
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Abstract
A bicycle assist unit is basically provided with a transmission and an assist motor. The transmission is configured to receive rotation of a crankshaft. The transmission includes a planetary gear mechanism. The planetary gear mechanism includes an output unit, a plurality of ring gears and a rotation restricting mechanism that selectively restricts rotation of the ring gears. The assist motor is configured to output a second drive force that is added to a first drive force that is outputted from the transmission on a power transmission path between the output unit and a front sprocket that is attached to the crankshaft.
Claims17
A bicycle assist unit comprising:
- a transmission configured to receive rotation of a crankshaft, the transmission including a planetary gear mechanism including an output unit, a plurality of ring gears and a rotation restricting mechanism that selectively restricts rotation of the ring gears;
- and
- an assist motor configured to output a second drive force that is added to a first drive force that is outputted from the transmission on a power transmission path between the output unit and a front sprocket.
The bicycle assist unit as recited in claim I, further comprising
- a transmission mechanism operatively coupled to the assist motor to transmit the second drive force to the power transmission path.
Dependencies are inferred from the claim text.