Assembly of the shaft and housing bore any bumps on the surface, burrs, rust or solid particles (such as debris, sand, mud), etc. exist, not only will make installation difficult bearing installation location is incorrect, and solid particles such as falling bearing will play abrasive, when the bearing rotation will rubs or scratches the surface of the bearing work, so must be carefully checked before installation, if there is such defects should be corrected. For example, by removing burrs oil filed, raised bump marks, rust and polish with fine emery cloth, and if the cleaning of solid particles, dirt, etc.. Note NSK Bearings with seals unavailable Law cleaning, sealing the interior should remain as non-cleanable.
Mounting surface should be clean with gasoline, kerosene, toluene or xylene solution to clean clean and dry with a clean rag, then coated with a thin layer of oil, so make the installation more convenient.
Before installing the bearing, you should use the appropriate measuring tool according to design drawings on technical requirements, check the shaft and housing bore and the relevant parts of the processing quality (such as dimensional accuracy, shape accuracy and surface roughness, etc.).
NSK bearing cleaning large, first with a temperature of 90 ~ 100 ℃ hot oil poured oil hot melt to the package, but not with a non-edge port net of scrap digging tool all the old oil, and then pouring hot few minutes and then with kerosene Flush to oil, gasoline and then finally cleaned again. After clean washing, gloves should be worn thin the bearing on the work bench clean cloth or paper to dry.
NSK bearing raceway after installation to ensure that not too much distortion, interference fit amount of interference can not get too big, and high speed centripetal force and high temperatures will shrink, or offset with the surface normal pressure. Or so with the surface relaxation, the amount of interference must therefore think of these two elements in the premise of strict be calculated. As the ambient temperature and velocity, the effective amount of interference on the high-speed bearings may be invalid.
Assumption that the results of this contradiction is too large (usually only in the ultra-high speed only in this case), just take the ring under lubrication and hydrostatic lubrication lubrication with a double measure, and this program has the potential to make the bearing dmn value exceeded 300 million mark.
In thinking about high-speed bearing clearance when the temperature only to think of the above elements, but also thinking about the axis thermal expansion effects on the clearance required bearing in working condition, that there is at operating temperature optimum clearance, And this clearance is included, the outer ring ball groove center precise alignment state composition. NSK Bearings Dena Man - Mr. Gao.
As high-speed relative sliding and bearing an effort to reduce internal friction, so it is best not to use the inner and outer rings relative axial displacement method to adjust the bearing clearance.
Demand note is: pondering bearings with the amount of interference and clearance, bearing materials at high temperatures has become soft and easily deformed features, as well as many from the room temperature to high temperature changes cause some permanent deformation.
In general, high-speed, high temperature conditions, and with clearance from the choice to try to adhere to the performance and accuracy of the bearing is a certain difficulty.


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