Bearing additional sealing device can effectively prevent the outside world, foreign invasion, but that additional sealing device will increase bushing axial dimensions of large institutions, for use in bearing and inconvenient installation and maintenance, at the same time, the sealing performance is also influenced by the diameter of axle and shell suitable parts processing precision and the influence of the bit bearing factory tolerances.And sealed bearings can have a good collar seal lubrication conditions, and can solve the problem of bearing parts, at the same time, it will save the lubricating system for complex.So strict in compact structure, sealing parts, sealed bearing are recommended to be used.Bearing its own seal besides has good dustproof, sealing effect, also can not supply lubricant in the process of bearing operation and keep a good state of operation, reduce the maintenance cost.
Bearing seal in the form of the structure of contact type 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 single lip seal and double lip seal.Non-contact seal generally has two kinds of dust cover and rubber seal.Dust cover seal gap is big, only suitable for dustproof, rubber sealing ring seal clearance is small, has good sealing effect.Contact sealed bearing usually only rubber seal auxiliary parts.Rubber seal lip is certain to stick together in contact with the bearing rotating parts interference, which has good dust seal effect, its limit rotational speed is low and friction torque is bigger.
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