Note bearing seal and high-speed rotation

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Bearing seal to keep the bearings in good lubrication conditions and normal working environment, give full play to the performance of the bearing, extend the service life of rolling bearings must ha ve a suitable seal to prevent lubricant leakage and dust, water, gas or other the intrusion of dirt. The sealing of the bearing can be divided into comes with two types of seals and additional sealing. The so-called bearing carrying the seal is made into the bearing itself means having the sealing performance. Such as bearings with dust cover, seals and other. This seal small footprint, easy installation and removal, the cost is relatively low.

Means of the so-called bearing additional sealing performance is the installation manufactured into the end cap and the internal sealing means having various performance.cross roller bearing

Choice of bearings plus sealed should consider the following main factors:

Bearing lubricant and Type (greases and lubricants); support structure bearing the working environment, the size of the space occupied; axis advantages, allows the angle of deviation; circumferential speed of the sealing surface; bearing operating temperature; manufacturing costs.

Plus seal is divided into two kinds of non-contact and contact.

1) non-contact seals

Part of the non-contact seal is the seal of its relative movement is not in contact with the and appropriate sealing gap. This form of sealing work in almost no frictional heat is generated, there is no wear, especially suitable for high speed and high temperature applications. The non-contact seal gap, labyrinth and gasketed various structural forms, respectively, used in different occasions. Non-contact seal gap as small as possible is preferred.

2) contact seals

The contact seal is the seal parts with its relative movement relative to the contact and no gap seal. This seal seals and fitting direct contact, greater friction at work, heat, could easily lead to poor lubrication, easy to wear, the contact surface, resulting in the sealing eff ect and performance degradation. Therefore, it applies only in the low-speed working conditions. Contact seals felt seal, cup seal structure used in different occasions.

Sealing of the requirements according to the the bearings working conditions and working environment in the engineering design is often integrated use of various forms of sealing, in order to achieve a better seal.

Bearing rotating at high speed, especially speed close to or exceeds the size table or speed limit, should pay attention to the following matters:

(1) use of precision bearings;

(2) bearing internal clearance (taking into account the temperature rise inside the bearing clearance reduction);high speed bearing

(3) Analysis of the type of material of the holder (for high-speed rotation, suitable for cutting copper alloy or phenolic resin cage Also applicable in high-speed rotation of the synthetic resin molded cage);

(4) analysis of lubrication (suitable for high-speed rotation cycle lubrication, spray lubrication, oil mist lubrication and oil lubrication lubrication.