Bearing support additional sealing device can effectively prevent the outside world foreign invasion, but this kind of additional sealing device will augment the axial dimensions of the institutions, to bearings use inconvenience and installation and maintenance, and its seal performance was also part of the shell trunnion and match the machining accuracy and line position tolerances of influence. And sealed bearings can bring a good seal lubricants environment, and can solve the problem of bearing parts, and at the same time also can save complex lubricating system. So in the compact structure, sealing demanding parts, all suggest using seal bearing. Bearing itself with good sealing in addition to dust, seal the effect, still can be in the process of running bearings lubricant and keep a good supply running condition, reduce maintenance costs.

Bearing their seal in the form of the structure is divided into contact and non-contact seal. According to the contact form can be divided into radial sealing and axial seal. According to the structure of the sealing ring can be divided into the single lip seal and double lip seal. Non-contact seal generally have brought dust cover and rubber sealing ring two kinds. Dust cover seal clearance big, only comfortable dustproof, rubber sealing ring seal clearance small, and have a good sealing effect. Contact seal bearing usually only the rubber sealing ring extremely auxiliary parts. Rubber sealing ring lips mouth as well as force bearing rotation and stick part made contact, thus plays good dust seal effect, but its limit rotational speed is low and friction torque is bigger.



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