| 摘要 |
The present invention relates to a transmission for a motor and, more particularly, to an apparatus which optimizes a transmission, which outputs rotational force only in one direction at different transmission gear ratios in accordance with forward and reverse rotational directions of a motor rotary shaft, permits a reverse input, transmits accurate rotational force without slippage, and has durability against long-term use. A transmission which receives rotational force from a rotary shaft (12) of a motor (10) and outputs the rotational force to an output shaft by shift transmission, in which the rotational force is outputted in one direction at different transmission gear ratios in accordance with forward or reverse rotation of the rotary shaft (12) of the motor, the transmission comprising: a drive shaft (100) in which one or more one-way clutch slopes (110) are formed on the outer periphery of a certain section thereof; a double one-way clutch (200) comprising a carrier (210) which accommodates a forward constraint (211) and a reverse constraint (212) at equal radial intervals with a predetermined phase angle difference on both sides thereof, and a forward output ring (220) and a reverse output ring (230), which are positioned at the outer sides of the forward constraint (211) and the reverse constraints (212) and are selectively rotated according to the rotational direction of the drive shaft (100); and a low-speed and high-speed rotational force transmission means (300, 400) which comprises a plurality of gears rotating in engagement with each other and rotates a rotary shaft (500), wherein the double one-way clutch (200) permits a reverse input with respect to the rotational direction in which the output shaft (500) is rotated. As such, the present invention can enhance the reliability and the shift accuracy of a transmission, and maximize the commerciality and market competitiveness of the transmission. |
