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四點(diǎn)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(nèi)外圈滾道是桃型的截面，當(dāng)無載荷或是純徑向載荷作用時(shí)，鋼球和套圈呈現(xiàn)為四點(diǎn)接觸，這也是這個(gè)名稱的由來；當(dāng)只有純軸向載荷作用時(shí)，鋼球和套圈就成了兩點(diǎn)接觸，可承受雙向的軸向載荷。四點(diǎn)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(diǎn)接觸球軸承只有形成兩點(diǎn)接觸時(shí)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(diǎn)接觸的場合，四點(diǎn)接觸球軸承極限轉(zhuǎn)速高，也適合于那些高速運(yùn)轉(zhuǎn)的場合。
