他们担心将简单的轴换为复杂的齿轮箱将增加维护成本一些设备将容易损坏。
They worry that replacing a simple shaft with a complex gearbox will increase maintenance costs and make it more likely that something will go wrong.
齿轮经热处理有较高的硬度和强度，与轴一同安装在可更换的轴套内运转。
Gear after heat treatment with high hardness and strength, and shaft installed in the replaceable shaft sleeve.
启动电机是一个简单的直流电机，在它的轴上有一个小齿轮。
The starter motor is a simple direct current (DC) motor which has a pinion gear attached to its shaft.
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