免鍵軸套是將螺栓的緊固力,透過斜面變换成内徑側和外徑側的面壓,使軸和毂緊固連結的摩擦緊固用具。祇要鎖緊螺栓即可以簡單地將導杆和毂(皮帶輸、齒輪、鏈輪等)安裝組合。
因不會有使用平行鍵發生摇晃的問題,所以在需要反覆進行正轉、逆轉之處使用時,特别能發揮效果。别外,可以承受鍵所無法負荷的推力荷重。
因為安裝時祇要鎖緊螺栓即可,所以能安裝在芻槽與毂無法對準之處。
因不需對軸與毂進行繁復的鍵槽加工,以及組裝時的研磨作業,故可削减總成本。

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