How to accurately determine NTN bearing damage reason

NTN bearing damage reason search step bearing operation such as appear abnormal phenomenon, should be timely find out the reason and troubleshooting. Sliding bearing after use to a certain period, total want to failure or damage, such as the damage analysis and take corresponding countermeasures, can increase its service life and working reliability, reduce maintenance frequency and cost, the host could prolong the service life of the host. Below is a common damage in the form of bearing characteristics, the damage reason of search and analysis method, and the effective measures to prevent or slow down the damage. 1) The noise from the lower cylinder body near the crankcase. Oil pressure decreases obviously. Engine in the condition of low and medium speed jitter throttle, a clear and depressing continuous beat accompanied by engine vibration phenomenon. 2) High speed engine, the body vibration is larger, a significant reduction in the oil pressure at the same time, for the sliding bearing and journal clearance is too large or bearing alloy ablation fall off. 3) Single cylinder fire test sound a little change, and the adjacent two cylinder break fire sound significantly diminished or disappeared, it is between the two cylinder crankshaft NTN bearing ring. 4) Speed is not high but the body vibration is larger, a swing shaking phenomenon, at the same time issued a heavy and large 'boom boom' tapping is a fracture. 5) Increases with temperature rise and noise to the sound become cluttered, may be the crankshaft bending. Check the actual load of the bearing and rotating speed and whether there is a discrepancy, the original design sliding bearing selection is correct; Know the damage and damage near the end of the anomalies, especially the emergence of the noise and fever status and evolution; Check the power supply and NTN bearing of the adjacent during mechanical components in the presence of abnormal phenomenon. Analysis of noise type, high and low tones, the interference frequency rhythm: pay attention to the temperature when the sudden increase in and so on, to write down the power supply and other parts; Find out in the host configuration characteristic and cooperate with the characteristics of sliding bearing, determine whether configure it properly, write down the ring relative to the location of the shell and the position in relation to the direction of the load; The shaft by hand with damaged NTN bearing try turning laps to experience running heavy degree, and then along the axial shaft driving back and forth a few times to experience the elastic axis along the axial degree, with the necessity of measuring the deflection of shaft; Check the bearing parts, lubrication; Check whether there is influential to NTN bearing vibration source. Debris or particle source pollution sources, water, or fluid, can through the bearing current source; Depending on the check, can be used as a basis to judge the NTN bearing of the damage was due to micro corrosion, abrasion, corrosion, or electric erosion.