Bearing speed limit index

In the general bearing model table, there will be a speed limit indicator. What does it mean?

When the bearing exceeds a certain operating speed, it will begin to generate uncontrolled internal heat.

The speed limit varies with bearing type, size, lubrication system, bearing internal design, and operating load. In addition, the speed limit will vary depending on the type of composite seal used (depending on the speed of the seal contact zone).

The term "speed limit" generally refers to the estimated speed, the number of revolutions per minute at which the bearing will remain operational.

The limit speeds for grease lubrication and oil lubrication are given in the general dimensions table. This value is based on bearings that are mounted on a horizontal shaft, suitable for lubrication operation, and light loads.

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Bearing inner ring fixing method

  Shoulder shoulder fixation
    The inner ring of the bearing is axially fixed by means of the shoulder and the interference.
    Suitable for supporting structures fixed at both ends.
    The structure is simple and the outer dimensions are small.
    2. Retaining ring fixing
    The inner ring of the bearing is axially fixed by the shoulder and the lock nut.
    Can withstand small bidirectional axial loads.
    The axial structure is small in size.
    3. Lock nut fixing
    The inner ring of the bearing is axially fixed by the shoulder and the lock nut. And the retaining washer is anti-loose, safe and reliable, suitable for high speed and heavy load occasions.
    4. End thrust washer fixing
    The inner ring of the bearing is axially fixed by the shoulder and the shaft end retaining ring. The shaft end retaining ring is screwed to the shaft end. The fixing screws should have a locking device.
    Applicable to occasions where the shaft end is not suitable for cutting threads or space is limited.
    5. Fixed sleeve fixing
    The axial fixation of the inner ring of the bearing is achieved by the radial dimension of the inner bore of the adapter sleeve being compressed and clamped onto the shaft.
    6. Unloading sleeve fixing
    The withdrawal sleeve is clamped in the same way as the adapter sleeve. However, due to the special nut, the unloading sleeve is convenient for loading and unloading, and is suitable for fixing the double-row spherical bearing with large radial load and small axial load on the optical axis.

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The Importance of Imported Bearing Lubrication and the Role of Imported Bearing Lubrication

Lubrication has an important influence on the fatigue life and friction, wear, temperature rise and vibration of imported bearings, especially rolling bearings. Without normal lubrication, imported bearings will not work. In the previous article, we have analyzed that the cause of damage to imported bearings indicates that about 40% of bearing damage is related to poor lubrication. Therefore, good lubrication of imported bearings is an effective measure to reduce bearing friction and wear.
In addition, the lubrication of imported bearings also has a variety of effects such as heat dissipation, rust prevention, sealing, and shock absorption.
The role of imported bearing lubrication can be briefly explained as follows
a. forming an oil film between the two rolling surfaces or sliding surfaces that are in contact with each other to separate the two surfaces, reducing friction and wear of the contact surface.
b. When using oil lubrication, especially when using circulating oil lubrication, oil mist lubrication and fuel injection lubrication, the lubricating oil can take away most of the friction heat inside the bearing and play an effective heat dissipation effect.
c. When grease lubrication is used, it is possible to prevent foreign matter such as dust from entering the bearing and sealing.
d. Lubricants have the effect of preventing metal corrosion.
e. Extend the fatigue life of imported bearings.

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The main cause of corrosion caused by corrosion of bearing products

The main causes of corrosion are as follows:
1. In the process of producing bearings, some enterprises did not strictly carry out anti-rust treatment on the bearing parts in the processing process and the finished bearing products in accordance with the requirements of cleaning anti-rust regulations and oil seal anti-rust packaging. If the ferrule has a long turnaround time during the turnaround, the outer ring of the outer ring is exposed to corrosive liquid or gas.
2. The quality of anti-rust lubricating oil and cleaning kerosene used by some enterprises in production cannot meet the requirements of process technology.
3. As the price of bearing steel drops and then falls, the bearing steel material gradually declines. For example, the content of non-metallic impurities in the steel is too high (the increase in sulfur content in the steel causes the corrosion resistance of the material itself to decrease), the metallographic structure deviation, and the like. The source of bearing steel used in production companies is more complicated, and the quality of steel is even more.
4. Some enterprises have poor environmental conditions, high levels of harmful substances in the air, and too little turnover space, making it difficult to carry out effective anti-rust treatment. Coupled with the hot weather, production workers violated anti-rust procedures and other phenomena.
5, some enterprises' anti-rust paper, nylon paper (bag) and plastic cylinder and other bearing packaging materials do not meet the requirements of rolling bearing oil seal anti-rust packaging is also one of the factors causing corrosion.
6. The turning allowance and grinding allowance of the bearing ring of some enterprises are small, and the oxide scale and decarburization layer on the outer circle are not completely removed.

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