| 摘要 |
A transmission system includes a rotatable main gear, first and second transmission gears rotatably and movably disposed and respectively in constant mesh with the main gear, and first and second power output components rotatably disposed and in constant mesh with each other. The first and second transmission gears detachably mesh with the first and second power output components respectively. The main gear is rotated counterclockwise to drive the second transmission gear away from the second power output component, and to drive the first transmission gear to mesh with the first power output component to rotate the first and second power output components. The main gear is rotated clockwise to drive the first transmission gear away from the first power output component, and to drive the second transmission gear to mesh with the second power output component to rotate the second and first power output components.
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