Q: Why do we use a ZZ bearing?
A: The of the iron cover has many uses, the main function is to prevent dust. The speed of the iron cover is higher. But because it is made of iron, it is not waterproof, but the rubber cover has greater friction, so the heat dissipation performance is also worse than that of the iron cover. And in terms of speed, the rubber cover is also lower than the iron cover. The is generally not higher than 150 ℃.
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