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碶(qi)塊式單向(xiang)(xiang)軸(zhou)承是(shi)在一(yi)個(ge)方向(xiang)(xiang)上可以自由轉動(dong)，而在另一(yi)個(ge)方向(xiang)(xiang)上鎖死的一(yi)種(zhong)軸(zhou)承。單向(xiang)(xiang)軸(zhou)承也叫超越(yue)離合器(qi)，只是(shi)根據行(xing)業不(bu)同，作用不(bu)同來命名的。