传动装置的作用是传送动力和改变旋转方向。
Gears serve to transfer power and change the direction of rotation.
一种可改变旋转方向的门把手组件，包含有把手、罩盖、弹簧和卡圈；
The utility model relates to a door-handle component capable of changing rotation directions, comprising a handle, a cover cap, a spring, and a clamping ring.
一种能使刷头随转轴一起转动，并且还可以改变旋转方向的双向旋转式电动牙刷。
The utility model relates to a two-way rotary electric toothbrush. The brush head of the utility model can rotate with a rotating shaft and the rotating direction can be changed.
齿轮的另一个作用是改变旋转方向。例如，汽车的差速器必须将动力转90度传递给车轮。
Another thing gears do is adjust the direction of rotation. For instance, the differential of car has to turn power 90 degrees to apply it to the wheels.
齿轮的另一个作用是改变旋转方向。例如，汽车的差速器必须将动力转90度传递给车轮。
Another thing gears do is adjust the direction of rotation. For instance, the differential of car has to turn power 90 degrees to apply it to the wheels.
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