A high temperature often indicates that the cylindrical roller bearing is in an abnormal condition. High temperatures are also detrimental to bearing lubricants. Sometimes bearing overheating can be attributed to the lubricant of the bearing. If the bearing is continuously rotated for a long time at a temperature exceeding 125°C, the bearing life will be reduced. The causes of high temperature bearings include: insufficient lubrication or excessive lubrication, impurities in the bearing raceway, excessively high limit speed, and long-term overload operation of the bearing. In normal use, vibration is quite sensitive to bearing damage, spalling, indentation, rust, cracks, wear, etc. will be reflected in the bearing vibration measurement. Therefore, by using a special bearing vibration measuring instrument (frequency analyzer, etc.), the magnitude of the vibration can be measured, and the specific situation of the abnormality can be inferred through the frequency distribution. The measured values ​​vary depending on the operating conditions of the bearing or the installation position of the sensor, so it is necessary to analyze and compare the measured values ​​of each machine in advance to determine the judgment standard. Cylindrical roller bearings can be divided into PO, P6, P5, P4, P2 according to the accuracy grade. The accuracy grades are sorted from low to high. The selection of cylindrical roller bearings is quick and easy to provide, and the comprehensive radial load on the fixed load is exposed from the local ring raceway fixed ring and transmitted to the corresponding shaft or bearing. The characteristic of this load is that the radial load vector is a relatively static resultant and ring. Bearing the load ring can be used relatively loose. The rotational load is the resultant radial load of the full complement cylindrical roller bearing ring acting on the drum rotating in the circumferential direction, and the various parts of the rotation, such as the rotational load, which are rotated by the resultant vector phase ring radial load, are borne by the rotational load. . The rotating load ring is tightly fitted, in special cases, the load, such as elective, is light or heavy, the load at low speed is only occasional, the bearing is made of hard material and the surface roughness is high, the rotating load bearing ring can also be Used loosely. The third load swings the load or the non-directional load, the combined direction of the radial load of the load ring is uncertain, it is characterized by the effect of the radial load vector ring raceway of the combined ring, the impact load, vibration in a certain area, vibration, The load, the direction of which is swing, the roller has to bear a certain area, or the load acting on the bearing, the load value often changes. To bear the load-bearing swing, the outer ring and the circumference, the bearing, and the hole should be used in close cooperation. 1. Type N0000 without ribs on the outer ring and type NU0000 without ribs on the inner ring. Cylindrical roller bearings can accept large radial loads, have a high limit speed, do not bind the axial displacement of the shaft or housing, and cannot accept axial load. 2. Cylindrical roller bearings NJ0000 and NF0000 with ribs on both the inner and outer rings can restrain the axial displacement of the shaft or housing in one direction, and can accept a small one-way axial load. NU0000+HJ0000, NJ0000+HJ0000, NUP0000 bearings can restrain the axial displacement of the shaft or housing in both directions within the axial clearance area of ​​the imported bearing, and can accept small bidirectional axial loads.
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