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Failure of cylindrical roller bearings

Failure of cylindrical roller bearings


Cylindrical roller bearing is one of the commonly used bearing types, in the operation of the cylindrical roller bearing to focus on the rolling sound, vibration, temperature and lubricant.

When the performance of the cylindrical roller bearing is less than use requirement and when not working, cylindrical roller bearing is malfunctioning or even failure, cylindrical roller bearing in the event of failure after accidents, machinery, equipment will halt, appear to wait for all sorts of anomalies, function loss causes were therefore need to find out in a short time, and take corresponding measures.

1. Rolling sound of cylindrical roller bearing

Cylindrical roller bearing noise is a kind of cylindrical roller bearing itself, that is, the inherent noise of cylindrical roller bearing;The other is the noise generated after the cylinder roller bearing is installed, which has nothing to do with the noise of the cylinder roller bearing itself. Some problems can be analyzed by listening to the sound.

A) noise is related to the cylindrical roller bearing manufacturing: here including maintain aircraft noise and tremolo, maintains a noise mainly in ball cylindrical roller bearings and tapered roller in cylindrical roller bearing, when cylindrical roller bearing rotation due to the vibration of the cage with roller and cage impact would sound. The sound is cyclical. Vibrato (all kinds of cylindrical roller bearing), there is a sound frequency is due to large raceway surface waviness caused by vibration.

B) inherent noise: raceway sound: the raceway sound is generated by the elastic characteristics of the rolling body when it contacts the raceway. When the cylindrical roller bearing rotates, the rolling body rolls on the raceway and makes a continuous and smooth sound;The abnormal rolling friction sound can produce the uncomfortable abnormal sound of metal friction, such as "squeak, squeak", which will not be produced when the lubrication is good. Therefore, it is not a problem under normal circumstances, and only after the noise increases should we pay attention to it.

C) noise caused by the improper use of exist. For all kinds of cylindrical roller bearing when cylindrical roller bearing raceway surface or roller surface is damaged, pit, rust, then produces a certain cycle of noise and vibration. When the cylindrical roller bearing in operation there is dust intrusion can produce contamination noise. This noise is cyclical, also with vibration, its sound size is not fixed, sometimes no.

2. Vibration of cylindrical roller bearing

Cylindrical roller bearing vibration of cylindrical roller bearing failure effect is obvious. For example: peeling, indentation, rust, crack and wear will be reflected in the cylindrical roller bearing vibration testing, so through the use of special cylindrical roller bearing vibration measuring device (frequency analyzer and vibration meter, etc.) can measure the size of the vibration, through frequency distribution can be concluded that the concrete situation of the abnormal vibration, the measured value of cylindrical roller bearing and sensor installation position and different using conditions, thus requiring prior to each machine after the analysis and comparison the measured value of decision criteria to determine.

3. Temperature of cylindrical roller bearing

Usually the temperature of the roller bearing as operation began to rise slowly, 1 to 2 hours to reach steady state. The normal temperature of cylindrical roller bearing due to the heat capacity, heat dissipating capacity, rotational speed and load of the machine. If the lubrication, installation is not appropriate, cylindrical roller bearing temperature will rise sharply, appear unusually high temperature, then must stop and take the necessary precautions.

4. The lubricant

Lubrication friction and wear of rolling cylindrical roller bearing, temperature rise, vibration and so on have important influence, not the normal lubrication, cylindrical roller bearing cannot work. Analyzes the damage reasons of cylindrical roller bearing show that about 40% of the cylindrical roller bearing damage is related to bad lubrication. Therefore good lubrication of the cylindrical roller bearing is the effective measures to reduce the cylindrical roller bearing friction and wear. In addition, the cylindrical roller bearing lubrication also impact of the heat dissipation, rust, sealing, etc. To ensure that the lubricant can't expired, selection are correct. Harvester of cylindrical roller bearing grease lubrication points, lubrication and two.

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