Sealed bearings are indispensable. Sealed to prevent leakage of lubricant, can also prevent invasion of harmful foreign bodies. It will cause abrasive wear of bearing Raceway, reduced bearing service life, and may also cause harmful gases and moisture corrosion to bearing parts, accelerated aging lubricant. Therefore, bearing seals are an important design element of the bearing system. Design should be taken into account to achieve the long-term role of seals and dust, while friction and misalignment is small, easy to disassembly, Assembly, maintenance simple.
Seals can generally be divided into static seal (fixed sealing) and sealing (Rotary seal) both called the gasket seal of the former, the latter known as seal ring seal. Sealing structure generally can be divided into contact and non-contact sealed type sealed.
Contact seal is the seal and seal parts required direct contact exist between certain laminating pressure. Contact form contact type sealing devices, lamination pressure, lubrication, sliding speed and the contact surface quality of bearing friction factors directly affect to allow speed and temperature rise. All contact type sealing devices in operation wear occurs during use, and their degree of wear and failure of the contact type sealing devices per se performance and use conditions.
Non-contact seals is between seals and sealing parts required direct contact does not occur. Due to non-contact type sealing devices seal gaps in service, in addition to lubricants friction is friction there will not be any other, non-contact seals do not wear, used for a long time does not generate significant heat, where it can be applied to high speed. Gap seal can not be too large, otherwise the sealing effect is not.
Bearing sealing device can set the supporting parts of the bearing, can also be set on the bearing, the former bearing seals, which is itself sealed.

 


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