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NTN bearing pre tightening force is carried out at room temperature, but is in working condition, the driving shaft system of micro tensile temperature rise, bearing preload will change, therefore, the preload set, you should take this factor into consideration.
It requires the ability to size, speed, bearing preload reasonable use settings and other conditions we just, to ensure that the transmission of life. If the preload is too large, power consumption, and even lead to overheating. If the preload is too small, the load on the body, the shaft, the outer ring of the gap between the role, from jumping, running, the transmission precision, to reduce the noise increased, affecting the gear meshing, serious damage, teeth and bearings.
NTN bearing assembly, such as: direct compression according to different internal bearing inner ring along the axial direction of the bearing pre tightening nut rotation, both inside and outside the ring, to eliminate the gap, to achieve the purpose of bearing preload. At present, the realization of common use: first, far exceeding the preloaded bearing, nut at last, and then back to the 1 / 4 ring. Assembling method, the advantage of this method is less investment, simple, practical, consistent excellent quality under the premise of the tapered roller bearing, it can use.
Working under the sliding friction is stable, reliable, no noise, in lubrication sliding bearing surface of the liquid lubricant does not directly contact the separated, but also can greatly reduce the friction loss and wear, the film also has a certain shock absorption ability. Application of NTN bearings are widely used, the problem of bearing fault:
1, the ceramic tile surface corrosion: spectrum analysis found that the non ferrous metal element concentration anomaly; iron spectrum, there are a lot of non ferrous metal parts of the submicron wear particles; lubricating oil excessive moisture, excessive acidity.
2, NTN bearing shaft neck surface strain: iron spectrum cutting abrasive or black iron oxide particles, metal surface temper colour.
3, NTN bearing shaft neck surface corrosion: spectrum analysis, abnormal concentrations of iron, iron spectrum, there are many iron content in the sub micron particles, too much water or acid oil exceed the standard.
4, strain NTN bearing surface: iron spectrum cutting abrasive, non-ferrous metals.
5, w back fretting: spectrum analysis found abnormal levels of iron, iron spectrum, iron content many in submicron particles, oil in water and acid anomaly.
Assembly of tapered roller bearings is difficult in the general assembly, cone bearing preload way preload NA directly affect the drive bevel gear transmission system and transmission accuracy of size.