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鏈輪與軸的旋轉將動力傳遞到鏈條,鏈條又通過齒輪將其傳遞至另一軸。根據輪轂的形狀大致可分類如下,A型(平板式)、B型(單邊輪轂式)、C型(雙邊輪轂式)。
以皮帶傳動時,無法獲得精確一定的速比;使用齒輪傳動時,則其兩軸距離不能太遠;故當兩軸間之轉速比須絕對正確,但因距離太遠不適合齒輪傳動時,則以鏈條傳動為最適宜。
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