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直线轴承具有结构紧凑、密封要求严格的特点时，建议在使用自密封密封时除了要有良好的防尘、密封效果外，还要在运行过程中无润滑油供应，以保持良好的运行状态，降低维护成本。

　　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.

　　直线轴承的自密封按结构可分为接触型和非接触型。根据接触形式，轴承座可分为径向密封和轴向密封。非接触式密封有防尘盖和橡胶密封圈两种。根据密封圈的结构可分为单唇密封和双唇密封。

　　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.

　　防尘盖具有较大的密封间隙，仅适用于防尘，橡胶轮轴承具有较小的密封间隙，密封效果好。橡胶密封圈唇与轴承转动部件接触，有一定的粘合力，达到良好的防尘密封效果，但其极限转速低，摩擦力矩大。接触密封圈一般只有橡胶密封圈极辅件。

　　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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