The additional sealing device supported by linear bearing can effectively prevent the invasion of foreign matters, but the additional sealing device will increase the axial dimension of the mechanism, which brings inconvenience to use, installation and maintenance. At the same time, its sealing performance is also affected by the machining accuracy and line tolerance of shaft diameter and shell fitting. The sealed bearing can not only have a good sealed lubrication environment, but also solve the problem of the supporting part, and also eliminate the complex lubrication system.

　　因此，在THK直線軸承具有結構緊湊、密封要求嚴格的特點時，建議在使用自密封密封時除了要有良好的防塵、密封效果外，還要在運行過程中無潤滑油供應，以保持良好的運行狀態，降低維護成本。

　　Therefore, when THK linear bearing has the characteristics of compact structure and strict sealing requirements, it is suggested that in addition to good dust-proof and sealing effect when using self sealing seal, there should also be no lubricating oil supply during operation to maintain good operation status and reduce maintenance cost.

　　直線軸承的自密封按結構可分為接觸型和非接觸型。根據接觸形式，軸承座可分為徑向密封和軸向密封。非接觸式密封有防塵蓋和橡膠密封圈兩種。根據密封圈的結構可分為單唇密封和雙唇密封。

　　According to the structure, the self sealing of linear bearing can be divided into contact type and non-contact type. According to the contact form, the bearing seat can be divided into radial seal and axial seal. There are two types of non-contact seal: dust cover and rubber seal ring. According to the structure of seal ring, it can be divided into single lip seal and double lip seal.

　　防塵蓋具有較大的密封間隙，僅適用于防塵，橡膠輪軸承具有較小的密封間隙，密封效果好。橡膠密封圈唇與軸承轉動部件接觸，有一定的粘合力，達到良好的防塵密封效果，但其極限轉速低，摩擦力矩大。接觸密封圈一般只有橡膠密封圈極輔件。

　　The dust cover has a large sealing clearance, which is only suitable for dust prevention. The rubber wheel bearing has a small sealing clearance, and the sealing effect is good. The rubber sealing ring lip contacts with the rotating parts of the bearing, which has a certain adhesive force and achieves a good dust-proof sealing effect, but its limit speed is low and its friction torque is large. Generally, the contact seal ring only has rubber seal ring pole auxiliary parts.

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