| 摘要 |
A single actuator type electronic sub-transmission is provided to simplify the structure of the sub-transmission by performing 2H-4H mode conversion and 4H-4L mode conversion using a single actuator having a voice coil. A single actuator type electronic sub-transmission comprises a rear wheel power transferring unit(4), a front wheel power transferring unit(20) and a mode conversion member(30). The mode conversion member comprises a mode conversion driving unit(36), which includes an actuator(37) and a mode conversion unit(31). The mode conversion unit(31) includes a guide axis(32) parallel to a rear output axis(8) of the rear wheel power transmitting unit, a 2H-4H lever(33) and a 4H-4L lever(34). The 2H-4H lever moves a ball lamp unit(11) from one side of the return spring(35) provided at the guide axis into a clutch module(10), which transfers a rotation force to a driving sprocket(9) coupled to the rear output axis.
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