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碶塊式單(dan)向(xiang)(xiang)軸(zhou)(zhou)承是(shi)在一個方向(xiang)(xiang)上(shang)可(ke)以自由轉動(dong)，而在另一個方向(xiang)(xiang)上(shang)鎖(suo)死的(de)一種軸(zhou)(zhou)承。單(dan)向(xiang)(xiang)軸(zhou)(zhou)承也叫超越離(li)合器，只是(shi)根據行業不(bu)同，作用不(bu)同來命(ming)名的(de)。