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骨(gu)(gu)(gu)架油(you)(you)(you)(you)(you)(you)封(feng)是(shi)(shi)油(you)(you)(you)(you)(you)(you)封(feng)的(de)典型代表(biao)，一般說(shuo)的(de)油(you)(you)(you)(you)(you)(you)封(feng)即指的(de)是(shi)(shi)骨(gu)(gu)(gu)架油(you)(you)(you)(you)(you)(you)封(feng)。油(you)(you)(you)(you)(you)(you)封(feng)的(de)作用(yong)(yong)(yong)一般就是(shi)(shi)將傳動(dong)部件中需要潤(run)滑的(de)部件與外部環境隔離(li)，不至(zhi)于(yu)讓潤(run)滑油(you)(you)(you)(you)(you)(you)滲漏。骨(gu)(gu)(gu)架就如(ru)同混凝土構件里面的(de)鋼筋(jin)，起到加(jia)強的(de)作用(yong)(yong)(yong)，并(bing)使油(you)(you)(you)(you)(you)(you)封(feng)能保持形(xing)(xing)狀及張(zhang)力(li)。按(an)結構形(xing)(xing)式可分單唇(chun)骨(gu)(gu)(gu)架油(you)(you)(you)(you)(you)(you)封(feng)和(he)雙唇(chun)骨(gu)(gu)(gu)架油(you)(you)(you)(you)(you)(you)封(feng)。雙唇(chun)骨(gu)(gu)(gu)架油(you)(you)(you)(you)(you)(you)封(feng)的(de)副唇(chun)起防塵(chen)作用(yong)(yong)(yong)，防止(zhi)外界(jie)的(de)灰塵(chen)，雜質(zhi)等(deng)進(jin)入機(ji)器內部。按(an)骨(gu)(gu)(gu)架型式可分為(wei)(wei)內包(bao)骨(gu)(gu)(gu)架油(you)(you)(you)(you)(you)(you)封(feng)，外露骨(gu)(gu)(gu)架油(you)(you)(you)(you)(you)(you)封(feng)和(he)裝配式油(you)(you)(you)(you)(you)(you)封(feng)。按(an)工作條件可分為(wei)(wei)旋轉骨(gu)(gu)(gu)架油(you)(you)(you)(you)(you)(you)封(feng)和(he)往(wang)返式骨(gu)(gu)(gu)架油(you)(you)(you)(you)(you)(you)封(feng)。用(yong)(yong)(yong)于(yu)汽(qi)油(you)(you)(you)(you)(you)(you)發動(dong)機(ji)曲軸，柴油(you)(you)(you)(you)(you)(you)發動(dong)機(ji)曲軸，變速(su)箱，差速(su)器，減震器，發動(dong)機(ji)，車橋等(deng)部位。

骨(gu)架(jia)油(you)封(feng)結構(gou)有(you)三部(bu)分(fen)組成(cheng)：油(you)封(feng)體(ti)、加強骨(gu)架(jia)和自緊螺旋(xuan)彈(dan)簧。密封(feng)體(ti)按照不同部(bu)位(wei)又分(fen)為(wei)底部(bu)、腰部(bu)、刃(ren)口(kou)和密封(feng)唇等。通(tong)常，在自由狀態下的(de)骨(gu)架(jia)油(you)封(feng)，其內徑比軸徑小，即具有(you)一定(ding)的(de)“過盈量”。

因(yin)此，當油封(feng)裝(zhuang)入油封(feng)座和(he)軸上之后，油封(feng)刃口的(de)壓力(li)(li)和(he)自緊螺旋彈簧的(de)收縮力(li)(li)對(dui)軸產(chan)生一定(ding)的(de)徑(jing)向緊力(li)(li)，經(jing)過一段時(shi)間(jian)運行后，該壓力(li)(li)會迅速減小乃至消失，因(yin)而，加上彈簧可以隨時(shi)補償油封(feng)自緊力(li)(li)