How To Check The Fault Of Iko Cylindrical Roller Bearing In Operation
How To Check The Fault Of Iko Cylindrical Roller Bearing In Operation
2022-01-13
Static Seals And Sealing Conditions Of Skf Imported Bearings
Static Seals And Sealing Conditions Of Skf Imported Bearings
2022-01-13

Difference Between Vibration In Ntn Imported Bearing And Ordinary Bearing

Ordinary Bearing

Swing load and indefinite load. Sometimes the direction and size of the load cannot be determined Ordinary Bearing accurately. For example, in high-speed rotating machinery, in addition to the load bearing the rotor weight is fixed in the direction, there is also the rotating load caused by unbalanced mass.

If this rotating load is much larger than the fixed load, the combined load is still rotating load; If the rotating load is much smaller than the fixed load, the composite load is the swing load. The magnitude and direction of rotating load and swinging load are constantly changing. In the variable working state, the load on some ferrules may be rotating load, fixed load or swinging load.

This load is called indeterminate load. Swing load and indefinite load shall be treated as rotating load in terms of fit. Too loose fit will cause damage to the mating surface. Transition fit or Ordinary Bearing interference fit shall be selected for the ferrule rotating relative to the load direction and the shaft or seat hole.

The interference size is based on the principle that when the bearing works under load, the NTN bearing ring will not produce “creep” on the shaft or on the mating surface in the seat hole. When the load is very light or the Ordinary Bearing ferrule rotates occasionally at low speed under heavy load, the transition fit can be selected.

At this time, the shaft surface should have high hardness and small surface roughness. For heavy load occasions, it shall be tighter than that in light load and normal load occasions. The Ordinary Bearing heavier the load, the greater the fit interference.

Fixed load. The synthetic radial load acting on the ferrule is borne by the local area of the ferrule raceway and Ordinary Bearing transmitted to the relative area of the shaft or Wuxi NTN bearing seat. This load is called fixed load.

The characteristic of fixed load is that the synthetic radial load vector is relatively static with the ferrule. Both the ferrule and the resultant radial load do not rotate or rotate at the Ordinary Bearing same speed are fixed loads. Loose fitting can be selected for ferrule bearing fixed load. 3 rotating load.

The synthetic radial load acting on the ferrule rotates along the circumferential direction of the Ordinary Bearing raceway and is successively borne by each part. This load is called rotational load. The characteristic of rotating load is that the synthetic radial load vector rotates relative to the ferrule.

There are three cases of rotating load: 1) the load direction is fixed and the ferrule rotates; 2) The load vector Ordinary Bearing rotates and the ferrule is stationary; (3) The load vector and ferrule rotate at different speeds.

Check the vibration of NTN bearing during operation. Peeling, indentation, corrosion, crack, wear, etc. will be reflected in the vibration Ordinary Bearing measurement of the bearing. The bearing vibration is very sensitive to the damage of the bearing. Therefore, the vibration can be measured by using a special NTN bearing vibration meter (frequency analyzer, etc.),

and the specific abnormal situation can not be inferred by frequency division. Since the measured values are different due to the service conditions of NTN imported bearings or the installation position of sensors, it is necessary to analyze and compare the measured values of each machine in advance to determine the judgment standard.

Difference Between Vibration In Ntn Imported Bearing And Ordinary Bearing

Second, check the sound of NTN bearing during rolling.

Even if the bearing has slight peeling and other damage, it will produce abnormal sound and irregular sound. Therefore, the sound detector can be used to distinguish. The sound detector is used to check the size and sound quality of bearing rolling sound in operation, which plays a role of prevention in advance.

Third, check the temperature of NTN bearing during rotation. If the temperature of NTN bearing outer ring can be measured directly by oil hole, it is more appropriate. Generally, the temperature of NTN bearing can be inferred according to the temperature outside the bearing chamber.

If the lubrication and installation parts are appropriate, the bearing temperature will rise sharply and abnormal high temperature will occur. At this time, the operation must be stopped and necessary preventive measures must be taken.

Generally, the temperature of NTN bearing rises slowly with the start of operation and reaches a stable state after 1-2 hours. The normal temperature of the bearing varies with the heat capacity, heat dissipation, speed and load of the machine.

Whether on the shaft or in the bearing seat, the rolling bearing is required to fix its position in the radial, axial and tangent directions. Radial and tangential positioning is achieved by tight fit of bearing ring, but axial positioning only adopts tight fit in a few cases; Generally, axial limit parts, such as end caps and retaining rings, are used to limit the axial position within the clearance range.

When selecting and fitting rolling bearings, the following four precautions should be emphasized:

1. The matching of rolling bearing shall make the installation and disassembly of bearing simple and convenient, and try to save time, labor and expenditure.

2. In addition, the ferrule cannot slide along the tangent direction in its mating surface, so as not to damage the mating surface.

3. In order to reduce the deformation of NTN bearing ring and give full play to the bearing capacity of the bearing, the bearing ring is well supported and stressed evenly.

4. It must adapt to the axial position and have the ability to swim within a certain range, so the free end bearing must adapt to the length change of the shaft and NTN bearing seat hole.

Chat with us
Chat with us
Questions, doubts, issues? We're here to help you!
Connecting...
None of our operators are available at the moment. Please, try again later.
Our operators are busy. Please try again later
:
:
:
:
Have you got question? Write to us!
:
:
This chat session has ended
Was this conversation useful? Vote this chat session.
Good Bad