The bearing seal comes with seals and additional sealing two categories can be divided into. The so-called bearing comes seal the bearing itself is manufactured into the device having a sealing performance. Such as bearings with dust cover, seals. This small sealed space, easy installation and removal, the cost is relatively low.
    Called bearing plus sealing performance of the apparatus, that is, inside the installation end caps, etc. manufactured into a sealing device having a variety of performance.
    Choice of bearings plus sealed following several major factors that should be considered:
    Bearing lubricant and type (grease and lubricants);
    (2) the working environment of the bearing, the size of the space occupied;
    3 shaft supporting structure for advantage, allows the angle of deviation;
    4 the peripheral speed of the sealing surface;
    5. Bearing operating temperature;
    6 manufacturing costs.
    Plus seal is divided into two kinds of non-contact and contactless. Are as follows:
    1) The non-contact seal
    The non-contact seal is the seal member and its relative movement of parts not in contact, and there is an appropriate gap sealing. This form of seal, in the work is almost no frictional heat is generated, no wear, particularly suitable for high-speed and high temperature applications. The non-contact seal used a variety of different structures in the form of the gap, labyrinth and gasketed, respectively, used in different occasions.
    Non-contact seal of the gap to be as small as possible is preferred.
    2) contact seals
    The contact seal is the seal parts with relative movement therewith contact without the sealing of the gap. Such seals are in direct contact with seals and fitting work friction greater the heat, could easily lead to poor lubrication, the contact surface is easy to wear, resulting in the sealing effect and performance degradation. Therefore, it is only applicable to medium and low speed conditions of work. Contact seals used felt seal, cup seal structure used in different occasions.


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