Fault Analysis of NTN Bearings on Transmission

The failure phenomenon of the NTN bearing on the transmission: the noise of the meshing of the transmission gear, the sound of the operation of the NTN bearing, etc.; the transmission emits an abnormal sound such as a dry grinding impact.

the reason:

Rolling NTN bearing oil shortage (such as the first shaft front NTN bearing), the steel ball mill loss round, the raceway has pitting, delamination, scar, the inner and outer races rotate on the shaft or inside the casing, or the NTN bearing clearance is too large. The elimination method is: replenish the oil and replace the damaged NTN bearing;

Gear machining accuracy or improper heat treatment process causes gear deflection or tooth shape to change. The troubleshooting method is: replace the damaged gear;

The backlash is too large or the spline fit is too large. The troubleshooting method is: replace the damaged synchronizer hub and shaft;

The repaired tooth surface does not trim the burrs, bumps, etc. The elimination method is: repair the tooth surface;

The gears are not replaced in pairs in the flaking, delamination, defect, wear or even replacement repair. The troubleshooting method is: replace the damaged gear;

The first axis and the second axis are bent and deformed. The elimination method is: replacing the deformed shaft;

After repairing the casing NTN bearing hole, the center distance of the two holes is changed or the two axes are not parallel. The troubleshooting method is: replace the damaged casing;

After the repaired fork is not right or the fork is worn, the unilateral surfacing is too thick, resulting in the position of the relevant gear is not accurate. The troubleshooting method is: replace the fork;

The second shaft fastening nut is loose or the other shafts are axially misaligned. The elimination method is: reassembly;

The self-locking device groove, the steel ball is worn out or the self-locking spring is fatigued or broken, resulting in off-position when the gear is engaged. The method of elimination is: replace the fork shaft, steel ball or spring;

Individual teeth are broken. The troubleshooting method is: replace the damaged gear;

Insufficient gear quality, deterioration, specifications do not meet the requirements or there are debris in the oil. The method of elimination is to replenish or replace the oil that meets the requirements.

1. NTN bearings are much less able to withstand loads than the same volume of sliding NTN bearings, so NTN bearings have large radial dimensions. Therefore, in the occasion of heavy load and the requirement of small radial size and compact structure requirements (such as internal combustion engine crankshaft NTN bearing), sliding NTN bearings are often used;

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Listening to FAG bearings in operation

It is increasingly important to check the condition of the running machine and prepare a thorough inspection plan, with FAG bearings as the focus of attention, as it is the most important rotating part of all machines, and condition monitoring is an important part of preventive maintenance. Early detection of FAG bearing damage to avoid equipment downtime during unplanned maintenance due to FAG bearing damage. Now let me introduce to you to listen to this method.

listen:

The use of hearing to identify irregular movements is a very common method, such as the use of an electronic stethoscope to detect abnormal noise of a part is used by experienced operators. If the FAG bearing is in good operating condition, it will emit a low humming sound. If it is a sharp hum, arpeggio and other irregular sounds, it usually indicates that the FAG bearing is in poor operating condition.

Sharp squeaking noise can be caused by improper lubrication. Improper FAG bearing clearance can also cause metallic sound. The dents on the outer ring of the FAG bearing can cause vibration and cause a smooth and crisp sound. If the knocking damage caused by the installation is also caused by noise, the noise will vary with the speed of the FAG bearing. If there is intermittent noise, it means that the rolling parts may be damaged. This sound occurs when the damaged surface is crushed. If there are pollutants in the FAG bearing, it will often cause noise. Serious FAG bearing damage will not occur. Regular and huge noise.

FAG bearing damage can be detected by hearing, but usually FAG bearings must be replaced immediately. Therefore, a better method, for example, using an electronic condition monitoring instrument, pre-ruptures the operation of the FAG bearing.

Compared to the old method (using a wooden stick or screwdriver to the FAG bearing housing and the other end to the ear), the FAG bearing condition can be more accurately estimated using advanced instruments.

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