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　　聯(lian)軸(zhou)(zhou)器是(shi)用來聯(lian)接不同機(ji)構中(zhong)的(de)兩根(gen)軸(zhou)(zhou)（主動(dong)(dong)(dong)軸(zhou)(zhou)和從(cong)動(dong)(dong)(dong)軸(zhou)(zhou)）使之共同旋轉(zhuan)以(yi)傳遞(di)扭(niu)矩的(de)機(ji)械零(ling)件。在高速重載的(de)動(dong)(dong)(dong)力傳動(dong)(dong)(dong)中(zhong)，有些(xie)聯(lian)軸(zhou)(zhou)器還有緩沖、減振和提高軸(zhou)(zhou)系動(dong)(dong)(dong)態性能的(de)作用。聯(lian)軸(zhou)(zhou)器由兩半部(bu)分組成，分別與(yu)主動(dong)(dong)(dong)軸(zhou)(zhou)和從(cong)動(dong)(dong)(dong)軸(zhou)(zhou)聯(lian)接。*般動(dong)(dong)(dong)力機(ji)大(da)都借(jie)助于聯(lian)軸(zhou)(zhou)器與(yu)工作機(ji)相(xiang)聯(lian)接。