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四點接觸球軸承是一種分離型軸承，也可以說是一套軸承可承受雙向軸向載荷的 角接觸球軸承其內外圈滾道是桃型的截面，當無載荷或是純徑向載荷作用時，鋼球和套圈呈現為四點接觸，這也是這個名稱的由來；當只有純軸向載荷作用時，鋼球和套圈就成了兩點接觸，可承受雙向的軸向載荷。四點接觸球軸承還可以承受力矩載荷，兼有了單列角接觸球軸承和雙列角接觸球軸承的功能。四點接觸球軸承只有形成兩點接觸時才能保證正常的工作。所以一般適用于那些純軸向載荷或軸向載荷大的合成載荷下呈兩點接觸的場合，四點接觸球軸承極限轉速高，也適合于那些高速運轉的場合。
