national油封6815
1、油封的作用

油封，又稱為旋轉(zhuǎn)軸唇形密封圈，英文為OIL SEALS、LIP SEALS、SHAFT SEALS。油封主要是用于防止?jié)櫥突蚱渌后w從其旋轉(zhuǎn)軸和箱體間泄漏以及塵?；蛏惩翉耐獠壳秩搿?油封的密封作用，就是密封唇與軸直接接觸，在油側(cè)和空氣側(cè)之間形成一層薄成穩(wěn)定的油膜，阻止油的泄漏。如果油膜過厚，則會產(chǎn)生軸向流動(dòng)面泄漏；如果油膜太少，則橡膠唇與軸之間干摩擦而產(chǎn)生磨損，使密封失效。

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