Vibration and temperature check of SKF needle roller bearings in operation

SKF needle roller bearings are sensitive to bearing damage. For example, peeling, indentation, rust, cracks, wear, etc. are reflected in the bearing vibration measurement. Therefore, by using a special SKF needle bearing vibration measuring device (frequency analyzer) Etc.) The magnitude of the vibration can be measured, and the specific situation of the abnormality cannot be inferred by the frequency division. The measured values ​​vary depending on the conditions of use of the bearing or the mounting position of the sensor. Therefore, it is necessary to analyze and compare the measured values ​​of each machine in advance to determine the judgment standard.
Second, the temperature of SKF needle roller bearings
The temperature of the SKF needle roller bearing is generally estimated by the temperature outside the bearing. If the oil hole can directly measure the outer ring temperature of the SKF needle bearing, it is more suitable.
Normally, the temperature of the SKF needle roller bearing rises slowly as the bearing starts to run, and reaches a steady state after 1-2 hours. The normal temperature of SKF needle roller bearings varies with the heat capacity, heat dissipation, speed and load of the machine. If the lubrication and installation parts are suitable, the SKF needle roller bearing temperature will rise sharply and abnormal temperature will occur. At this time, it is necessary to stop the operation and take necessary precautions.
The thermal sensor can be used to monitor the working temperature of the SKF needle roller bearing at any time, and automatically alarm or stop the occurrence of the burning shaft accident when the temperature exceeds the specified value.
The high temperature often indicates that the SKF needle roller bearing is in an abnormal condition. High temperatures are also harmful to the lubricant of the bearing. Sometimes bearing overheating can be attributed to the lubricant of SKF needle roller bearings. If the bearing is rotated for a long time at a temperature exceeding 125 °C, the life of the SKF needle bearing will be reduced. Causes of high temperature bearings include: insufficient lubrication or excessive lubrication, lubricants. Contains impurities, excessive load, bearing damage, insufficient clearance, and high friction caused by oil seals.

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Fault diagnosis and inspection of separation bearing damage

If the clutch is not able to meet the above requirements, it is considered a malfunction. After a fault occurs, first determine which phenomenon is the separation bearing damage. After the engine is started, the clutch pedal is lightly pressed. When the free travel is just eliminated, the “sand” sound that appears is the separation of the bearing rings.
When checking, the clutch bottom cover can be removed, and then a few accelerator pedals are pressed to slightly increase the engine speed. If the sound is louder, observe the presence or absence of Mars. If there is Mars, the clutch release bearing is damaged. If Mars is in a single strand, it means that the separation bearing balls are broken. If there is no Mars, but the metal breaks, it means excessive wear.

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