Bearing seal and the attention in high speed rotation

Bearing seal is in order to make bearing keep good lubrication condition and normal work environment, give full play to bearing performance, prolong service life, rolling bearing must have appropriate seal to prevent leakage and dust, lubricants moisture or other dirt invading. Bearing seal can be divided into bringing seal and plus seal two kinds. The so-called bearing is the cabin seal bearing itself into a sealing device manufacturing. Such as bearing with dust cover, seals, etc. This seal take up the space is small, it is easy to install and disassemble cost less.

The so-called bearing plus sealing performance device, be in namely installation into a cultura internal manufacturing various performance sealing devices.

The choice of bearing plus seal should consider the following several major factors:

Bearing lubricant and species (grease and lubricant); Bearings working environment, take up the space is size; Axial bearing structure advantages, allow Angle deviation; and The circumference of the seal surface speed; Bearing temperature; The manufacturing cost.

Plus seal and divided into contactless and non-contact two kinds.

1) contactless seal

Contactless seal its relative motion is seal parts does not contact, and a proper clearance seal. This form of seal, in the work almost do not produce friction heat, and not wearing, especially suitable for high speed and high temperature occasion. Contactless seal common have clearance type, labyrinth and gasket type, etc. Various kinds of different structure form, applied to different places respectively. Contactless seal clearance to as small as possible is preferred.

2) contact seal

Contact seal its relative motion is sealed parts and no gap in contact sealed. This seal because the sealing parts and direct contact with a larger, work in the friction, easy cause calorific value also contact the bad lubrication, yi, causing damage sealing effect and slow performance. Therefore, it only applies to medium, low working conditions. Contact seal common have felt sealing, skin bowl seal structure form, applied in different situations.
According to the working condition and working environment bearing of sealing requirement, in engineering design is often comprehensive use of various sealing form, in order to achieve better sealing effectiveness.
Bearing in high-speed, especially speed approach or exceed the size limit speed recorded in the list, main should pay attention to the following matters:

(1) using precision bearings;
(2) analysis bearing clearance (considering internal temperature of bearing internal clearance generated decrease);
(3) to analyze the cage material type, suitable for high speed rotating (by copper alloy or phenolic resin cut. I also maintains a making a suitable for high speed rotating synthetic resin molding keep frame);
(4) to analyze the lubrication methods (use of suitable for high speed rotating circulation lubrication, jet lubrication, oil mist lubrication and oil-gas lubrication lubrication method etc.
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