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Rolling bearings KOYO bearings check project sound, vibration, temperature, lubrication and so on, are as follows:
1 sound of rolling bearing
Using the sound device size and sound quality sound check operation of rolling bearings, bearing even slightly stripping and other damage, abnormal tone and irregular sound from measuring devices will be to distinguish between the sound measurement.
2 bearing vibration
Bearing vibration of bearing damage is very sensitive, such as spalling, indentation, rust, cracks, wear will be reflected in bearing vibration measurement, therefore, by using a special measuring bearing vibration (frequency Analyzer, etc), measure the size of vibration, frequency analysis, it can be deduced through unusual circumstances. For bearings under the conditions of use or installation sensor locations for measurements are different, so each machine requires a predetermined standard analysis and comparison of measurement values.
3, bearing temperature
Temperature of the bearing, General bearing outside the room temperature, it can be concluded that if the holes, can be used to directly measure the temperature of the bearing outer ring, is more appropriate. Typically, the bearing operating temperature rise for 1-2 hours, gradually reach a steady state. Bearing the heat capacity of the machine's normal temperature, heat capacity, speed and load changes. KOYO bearings if the check and troubleshooting lubrication operation, install the appropriate Ministry, bearing temperature rise will suddenly stops running when the abnormal high temperature occurs, take the necessary preventive measures.
After the KOYO bearings damage check, according to the bearing damage, to determine the cause of bearing failure and damage.
1. Raceway surface of sheet metal
Periodic pulse under load, and the surface of the outer ring raceway of roller bearing, cause contact stress of cyclical change. When the stress cycle reaches a certain value, or rolling, fatigue spalling on Raceway surface. If the bearing load is too large, this fatigue worse. In addition, the bearing is not installed properly, the shaft bending, there is also a Raceway spalling. Fatigue spalling of runway operation will reduce the accuracy of the shaft, vibrations and noises of the body occurs.
2. Bearing Burn
KOYO bearings roller, rolling temper colors. The reason is usually burned insufficient lubrication, oil quality does not meet the requirements or deterioration, as well as the bearing Assembly too tight.
3 plastic deformation
Uneven contact surfaces of the bearing raceways and rollers of the craters, shows plastic deformation of the bearing. Because a lot of static load-bearing or impact load, yielding local stress exceeds the limit of surface material, which generally occur in low-speed rotation of the bearing.
4 cracking of bearing ring
Crack of bearing rings may be due to tight or loose KOYO bearings in the bearing outer ring or ring, bearing tolerance deformations, housings and poor surface finish.
5 cage debris
The reason is the lack of lubrication, the ball smashing, seat tilt.
6. Stick to scroll iron cage
Because the body may stay on the roll cage, or lubrication inadequate.
7 seat Raceway serious wear
Washer may fall into the hands of foreign, oil or lubricants brand less inappropriate.
KOYO bearings damage, impact factors are: under load conditions, lubrication and Assembly conditions, environmental conditions and accuracy of materials or manufacturing.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7221CDF NSK | 105 | 190 | 36 |
| 7221BDF NSK | 105 | 190 | 36 |