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Spherical roller bearing of shock vibration from shock due to the failure to hemisphere surface wave method to spread through the SKF bearing, bearing blocks to the Cabinet or rack. Because of the high impact vibration the frequency with which each passing through parts of the interface, its energy losses of about 80%. Therefore, measurement point should be as close to measuring bearing load bearing area, should minimize the Middle passing links, detection point departure of FAG bearing directly the closer, the better.
Based on the structural characteristics of spherical roller bearings, use conditions, vibration may be caused by low frequency pulse frequency about 1kHz (through vibration), may also be the frequencies above 1kHz, thousands of and even the vibration of high frequency shushiqian kHz (natural vibration), typically containing both the above two vibration elements. Therefore, detection of roller bearing vibration velocity and acceleration signals should be covered or covering each of these two bands simultaneously and, if necessary, to filter out frequency components they need.
Self-aligning roller bearing's fault characteristics are reflected in the different frequency bands, so you can use different frequency bands, use different methods of NSK bearing fault diagnosis.
1. Low frequency segments in spherical roller bearings fault diagnosis, low frequency 1kHz frequency range. Low-pass filter can be used (for example, cutoff frequency FB 1kHz) made after the high-frequency component spectrum analysis filter.
2. Band in the TIMKEN bearing fault diagnosis, frequency 1~20kHz frequency range. Similarly, the use of the frequency filter can also be used.
(1) high-pass filter with cutoff frequency for high pass filter 1kHz filter 1kHz low frequency components to eliminate mechanical interference; and then with peak, RMS value of the signal or kurtosis coefficient as the monitoring parameters. INA bearing in many simple monitoring instruments in this way.
(2) band-pass filter using band-pass filter extract the resonant frequency of the bearing components or parts of components, with band-pass signal power monitoring parameters, pass band cutoff frequency of the filter according to KOYO bearing type and size, for example, 309-ball bearing, band-pass center frequency is 2.2kHz, bandwidth can be selected as the 1~2kHz.
3. High frequency segments in spherical roller bearings fault diagnosis of high frequency 20~80kHz frequency range. Due to bearing failure caused a large impact energy distribution in the shadow of high frequency, if used the right way of acceleration sensor and fixed to ensure higher resonant frequency the sensor, use resonance enhancement of resonant sensor or circuit are attenuating vibration signal is very effective for fault diagnosis. Sweden's shock pulse meters (SPM) and the United States first IFD method is the use of the frequency band.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 4T-320/28X NTN | 28 | 52 | 16 |
| 4T-32305 NTN | 25 | 62 | 24 |