First, sound of the rolling bearing, the sound of the device to the working of the rolling bearing sound of the size and the sound quality inspection, bearing even if have a slight damage to peel, etc, also can send out sound and irregular abnormal sound, measured with a sound is able to identify.

Second, the vibration of the bearing NSK bearing vibration on bearing damage is very sensitive, such as peel, indentation, rust, crack, wear, etc, will be bearing vibration measurement in reflected in, so, by the use of the special bearing vibration measurement device (frequency analyzer, etc) can measure the size of the vibration, through the frequency points not that abnormal specific situation. The measurement of numerical of bearing conditions of use or sensor installation position and different, so need to every machine in advance of the measured value analysis is made after the judgment standard.

 
Third, the temperature of the bearing NTN bearing temperature, and they have a bearing the outdoor temperature that out, if use oil hole can direct measurement of bearing outer ring temperature, is more appropriate. Usually, the temperature of the bearing with slowly starting to run up, 1-2 hours to achieve stable state. The normal temperature of the bearing capacity of the machine, heat, speed and load and different. If the lubrication, installation is appropriate, the bearing temperature sudden will rise, can appear abnormal high temperature, then must stop operation, and take the necessary measures to prevent it. Based on a lot of test data, table 4-1 listed the various mechanical bearing outer ring when the average temperature work for your reference. As temperature, speed, load by lubrication, the influence of the environment, table value only roughly said temperature range. The use of thermal can supervise the work of bearing temperature, and realize the temperature more than rating to households or stop for fuel shaft to prevent accidents.



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