Bearing construction and ways to use bearings correctly

Bearing construction and ways to use bearings correctly

Bearing construction and ways to use bearings correctly

1. How to choose bearings?

See Selection Methods for Bearings here

2. How to choose the right grease for bearings?

To choose the right grease for your bearings, you can refer to the grease selection guide from your supplier.

3. Do I need to add grease to the bearings with 2 caps?

Bearings with built-in two steel covers (-2Z; -ZZ) or two rubber seals (-2RS; -2RSH; -2RS1) have been pre-lubricated with the appropriate type and amount of grease. ensure these types of bearings operate to the end of their calculation life.
Therefore, we should not pry off the seal or the cover to add more grease, this does not make the bearing work better, but is likely to damage the bearing because disassembling the seal or the cover can cause damage. if they are damaged, the excess grease applied will make the bearing hotter, the added grease may not be compatible with the grease already inserted by the manufacturer.
However in some cases such as applications with vertical shaft or rotating outer ring a special lubrication regime is required, please contact the supplier for more details.

4. How to install bearings correctly?

For correct bearings please contact your supplier.

5. Average working life of the bearing?

Service life for the same bearing but used for different applications will not be the same. Technically, the bearing life is determined by the number of revolutions and varies (affected) depending on: load (heavy or light, even or irregular), working temperature (high or low). , working environment (dirt, humidity, chemicals).

6. How do I know when a bearing is about to fail?

A bearing that is about to fail usually has the following signs:
  • The bearing housing assembly temperature is abnormally high
  • Creating unusual noise and hissing noise.
  • Vibration was abnormally high
By periodically monitoring the parameters and markings described above, the user can evaluate and predict the working status of the bearing.

7. Is there any way to know the working status of the bearings while in use?

As answered in question 6, the bearing performance will be reflected through temperature, noise, and vibration parameters. The periodic monitoring of these parameters gives the user a relatively accurate basis to evaluate the operating status of the bearing. Currently, the most effective method for monitoring operating conditions and predicting bearing failures early is the method of measuring and analyzing bearing vibrations.

8. How to measure bearing wear?

Each type of bearing is made with a certain internal clearance (clearance) according to the standard. This gap measurement and inspection requires specialized equipment with high accuracy. Testing the wear by the "lead-in" method as in some places is not recommended because of its inaccuracy. Usually after one operation, the bearing wear will be uneven across the entire roller groove surface. Micro-porosity on the surface of the roller grooves will be the main cause of rapid bearing failure if the lubrication is not ensured. Evaluating a bearing through a sense of “tachiness” in one way or another does not allow the user to accurately assess the bearing condition.
Currently, the monitoring of the operating status of bearings by measuring methods, vibration analysis to detect and monitor the failure frequencies of bearings are being commonly applied with measuring and analyzing instruments. dedicated vibration.

9. Why is it so easy to replace the bearing with the clutch hole on the cuff? Remedies?

When replacing a bearing with a taper hole (optional support ball bearing, drum drum ball bearing) often breaks down quickly, this happens mostly because the tightening of the nut is too tight to make the bearing without the necessary internal clearance . For fitting these types of bearings there is an internal clearance remaining after the correct mounting.

10. What to do when the inner ring or outer ring is rotated on the shaft or bearing body?

The cause of this phenomenon is due to:
  • The bearing becomes stuck (unable to run) due to a loss of internal clearance or due to improper lubrication.
  • Incorrect mounting tolerance.
As a result, the bearing slowly rotates in the bearing or on the shaft while working and gradually develops a uniformly rotating bearing in the shaft or on the bearing, generating heat from friction, damaging the lubricant and thereby damaging the ring. ball as well as shaft (or drive).
The best method is to replace the shaft or drive. In the event that a replacement cannot be made, the welding and reworking method can be used to correct the mounting tolerances. However, care must be taken during machining to avoid shaft deviation.