滾子

来自维基百科,自由的百科全书

滾子是可以滾動以減少摩擦力的物體古埃及人搬運巨石時即用樹幹垫于下方以便运输,現今滾子或滾筒仍然廣泛應用,例如機械軸承(啤令),運輸帶等。多数滚子用于降低摩擦力,但亦有滾筒係增加摩擦力,例如打印機內有大量滾筒用作送紙,要有摩擦力才行。

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