| 摘要 |
PURPOSE: A unidirectional gear is provided to cut down manufacturing expenses by simplifying the structure with rotating an external gear unidirectionally in forward or reverse rotation of an internal gear and with rotating the internal gear unidirectionally in forward or reverse rotation of the external gear. CONSTITUTION: A gear unit having a middle gear(3) and a latch(4) is placed between an internal gear(1) and an external gear(2), and the latch is installed in rotary plate(5). The external gear is rotated forward with engaging the latch with the internal gear and the external gear in turning the internal gear. An outer lath is fitted to a latch groove out of the rotary plate in turning the internal gear reversely, and the external gear is rotated forward with turning the middle gear. The rotational direction of the gear is changed with using the latch between internal and external gears or chaining the direction of the middle gear. The structure is simplified, and manufacturing cost is reduced with rotating gears unidirectionally.
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