Swinging load and indeterminate load. Sometimes the direction and magnitude of load cannot accurately determine, for example in high speed rotating machinery, in addition to the bearing rotor weight of fixed direction load outside, and unbalanced load caused by the rotation of the quality, if the rotating load than the fixed load is much larger, the synthetic load is still rotating load; and if the rotating load much smaller than the fixed load, synthesis of JLM710949C/JLM710910 Timken load for the load sway. No matter the rotating load or load sway, the size and the direction are in constant change. In the variable work condition, some ring load when possible but rotating load, sometimes is fixed load, but also when the load sway. This load is called indeterminate load. Swinging load and indeterminate load and rotating load equal in coordination, with too loose will cause the mating surface damage. Relative to the load of the direction of rotation of the ring and a shaft or the seat hole, should choose the transition fit or interference fit. Interference in size to the bearing load, the NTN bearing ring on the shaft or the seat hole of the mating surface does not produce the "creeping" phenomenon as the principle. In the load is very light, or under heavy load ring occasionally rotates at low speed, can choose the transition fit, at the surface of the shaft surface should have higher hardness and smaller roughness. For heavy load situations, usually should be better than the fit under light load and normal load occasions for tight. The heavier the load, the greater the interference.

Fixed load. Synthesis of radial loads acting on the ring, bear the local area by the raceway, and spread to the relative area of the shaft or the Wuxi NTN bearing load, this is called fixed load. Characteristics of JLM710949C/JLM710910 Timken fixed load is the synthesis of radial load vector and the ring relatively static. Rings and synthetic radial loads are not turning or rotating at the same speed are fixed load. Under fixed load can be selected with a loose ring. The 3 rotating load. Synthesis of radial loads acting on the ring raceway, along the circumferential direction of the rotation, sequentially by each part of the load bearing, called the rotating load. Characteristics of the rotary load is the synthesis of radial load vector relative to the ring rotation. Rotating load following three situations: 1) the loading direction is fixed, the ferrule rotation; 2) load vector rotation, ring static; (3) the load vector and the ring to rotate at different speeds.
First, check the NTN bearing vibration at work from spalling, indentation, rust, crack, wear will be reflected in the measurement of bearing vibration, bearing vibration of bearing damage is very sensitive, therefore, by using the NTN special bearing vibration measuring device (frequency analyzer etc) can be measured by the vibration size, through frequency cannot be inferred from abnormal situation. Due to the measured value is different for NTN import bearing conditions of use or sensor installation location, requires prior to each machine measurement are analyzed and compared to determine the standard of judgment.
Voice second, check the NTN bearing rolling bearing the because even a slight separation of injury, will make the abnormal sound and irregular sound, so I used the sound measuring device can be resolved, using sound measuring device, the size and quality of the bearing in operation rolling sound to examine, to advance the prevention the role of.
Third, to check the NTN bearing rotation temperature if the uses of oil hole can directly measure the temperature of NTN bearing outer ring, the more appropriate. In general, NTN bearing temperature, generally on the basis of bearing outside of room temperature can be speculated that the. If the lubrication, install suitable, bearing temperature quick rise, abnormal high temperature occurs, then have to stop running, take the necessary preventive measures.
In general, NTN bearing temperature as running slowly rising, reach a steady state after 1-2 hours. The normal temperature of bearings with the heat capacity of the machine, the heat dissipating capacity, speed and load and different.