First, the bearing vibration
NTN thrust ball bearing vibration damage to the bearing is very sensitive, such as peeling, indentation, rust, cracks, wear and so will be reflected in the bearing vibration measurement, so through the use of special bearing vibration measuring instrument (frequency Analyzer, etc.) can measure the size of the vibration, can not be inferred by the frequency of the specific circumstances of the exception. The measured values vary depending on the conditions of use of the NTN thrust ball bearings 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 bearing temperature
NTN thrust ball bearing temperature, generally the temperature outside the bearing chamber can be speculated that if the use of oil hole can directly measure the NTN thrust ball bearing outer ring temperature, the more suitable position.
Generally, the temperature of NTN thrust ball bearings gradually increases with the start of bearing operation and reaches a steady state after 1-2 hours. NTN thrust ball bearings of the normal temperature due to the heat capacity of the machine, heat dissipation, speed and load different. If the lubrication, the mounting section is appropriate, the bearing temperature will rise sharply, there will be abnormal high temperature, then you must stop running, take the necessary precautions.
The use of thermal sensors can be monitored at any time NTN thrust ball bearings operating temperature, and to achieve automatic alarm temperature exceeds the specified value or stop to prevent combustion shaft accident.
Often with high temperature has been in an abnormal situation. High temperature is also harmful NTN thrust ball bearing lubricant. Bearing overheating can sometimes be attributed to the bearing lubricant. If the bearing temperature exceeds 125 ℃ even long-term transfer will reduce the bearing life. Causes of high temperature bearings include: insufficient lubrication or excessive lubrication, lubricants. Containing impurities, the load is too large, NTN thrust ball bearings damaged ring, lack of clearance, and high friction oil seal and so on.
Therefore, the continuous monitoring of NTN thrust ball bearing temperature is necessary, whether it is measuring the bearing itself or other important parts. If the operating conditions remain unchanged, any temperature change may indicate that a fault has occurred.
NTN thrust ball bearing temperature measurement can be regularly with the help of a thermometer, such as digital thermometer, bearing temperature can be accurately measured and ℃ or Fahrenheit fixed unit display.
Importance of NTN thrust ball bearings, which means that when it is damaged, it will cause equipment downtime, so this type of bearings should preferably be equipped with temperature detectors.
Under normal circumstances, NTN Thrust Ball Bearings immediately after lubrication or re-lubrication there will be a natural temperature rise and lasted one to two days.