national油封6815
1、油封的作用

油封，又稱為旋轉軸唇形密封圈，英文為OIL SEALS、LIP SEALS、SHAFT SEALS。油封主要是用于防止潤滑油或其它液體從其旋轉軸和箱體間泄漏以及塵埃或沙土從外部侵入。 油封的密封作用，就是密封唇與軸直接接觸，在油側和空氣側之間形成一層薄成穩定的油膜，阻止油的泄漏。如果油膜過厚，則會產生軸向流動面泄漏；如果油膜太少，則橡膠唇與軸之間干摩擦而產生磨損，使密封失效。

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