nsk bearing raceways of inner and outer rings were tested arc-shaped channel, the channel radius slightly larger than the radius, mainly used to bear the load can withstand a certain amount of axial load. When the bearing radial clearance increase with rolling bearings can withstand axial load, and it applies to high-speed rotation. Can still work, but the impact of their service life. Speed ??is high, should not be thrust ball bearings can be used bearing the pure axial load.
nsk bearings are generally two halves riveted steel stamping cage, known as wave-shaped cage, but the large size or high-speed solid cage, this remains the same stamping cage guide by ball, roller bearing cages guide ring or outer ribs. Compared with the same size as other types of bearings, the small coefficient of friction, vibration and noise is also low, high limit, high accuracy, but the impact of intolerance, not suited to bear a heavier load.
Lubricated bearings, the grease coating as possible, which is a common misconception. Rolling bearings and bearing indoor too much oil will cause excessive oil mixing, resulting in extremely high temperatures. The number of filling lubricant, rolling bearing nsk bearing internal space to fill 1/2 ~ 1/3 of appropriate, high-speed should be reduced to 1/3.
Not all of the rolling bearing requires a minimum clearance of conditions you must choose the appropriate clearance. GB 4604-93 in rolling bearing radial clearance is divided into five groups -2 group, Group 0, Group 3, Group 4, Group 5, the value of clearance in order from small to big as the standard clearance. Basic radial clearance group applies to all operating conditions, the conventional temperature and common interference fit; work under special conditions of high temperature, high-speed, low noise, low friction, rolling bearings are advised to use a large radial clearance; on precision spindle, machine tool spindle bearings should use a smaller radial clearance; nsk bearings can maintain a small amount of clearance work. In addition, you do not care for the separation-bearing clearance; Finally, the clearance of bearings installed, than before the installation of the original clearance, because the bearings have to bear the load rotation, bearing fit and load elastic deformation.
nsk bearings after installation, in order to check the installation is correct, the operation check. Small mechanical hand rotation, to determine whether the rotation smooth. Inspection items nick, indentation caused by dysfunctional torque instability, arising due to poor installation, mount processing bad due to the clearance is too small, installation errors, and seal friction torque and so on. If there is no exception, you can start the power operation.
Power operation, start from no-load low-speed, slowly increased to the conditions stipulated in the rated operation. Test run to check the matters, whether there is abnormal sound, Rolling temperature changes, lubricant leakage or discoloration. If it is found abnormal, should immediately suspend the operation, check the mechanical, if necessary, to remove the nsk bearing inspection.
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