POWER TRANSMISSION MECHANISM

There is provided a power transmission mechanism equipped with a first shaft including a first double helical gear, a second shaft including a second double helical gear and a third double helical gear arranged in alignment with the second double helical gear in an axial direction, and a third shaft including a fourth double helical gear that meshes with the third double helical gear. The second double helical gear includes a pair of right and left tooth portions whose torsional directions are reverse to each other such that the left tooth portion and the right tooth portion are offset in phase from each other, and the third double helical gear includes a pair of right and left tooth portions whose torsional directions are reverse to each other such that the left tooth portion and the right tooth portion are identical in phase to each other. 提供一种传动机构，该传动机构包括第1轴、第2轴和第3轴，所述第1轴具有第1人字齿轮，所述第2轴具有第2人字齿轮和沿轴向与第2人字齿轮并排配置的第3人字齿轮，所述第3轴具有与第3人字齿轮啮合的第4人字齿轮。并且，第2人字齿轮的扭转方向互为反向的一对齿部中的左齿部的相位与右齿部的相位错开，第3人字齿轮的扭转方向互为反向的一对齿部中的左齿部的相