The installation and adjustment of high-speed import NSK bearing

NSK imported bearing with high speed and NSK import clearance due to the high speed bearings should be in accordance with the requirements of high precision NSK bearing import and according to the requirements of NSK import bearing high temperature, so when considering its coordination and clearance, to consider the following two points: ( 1) From normal temperature to high temperature when the size of the change and hardness change; ( 2) Under the high speed centrifugal force caused by the force system and shape changes. All in all, under the condition of high speed, high temperature, the coordination and clearance on the choice of NSK bearing import should strive to maintain accuracy and work performance, it is difficult. NSK import bearings after installation to ensure that the raceway of small deformation, the amount of interference interference fit can't get too big, and under the high speed centrifugal force and high temperature thermal expansion, or on the surface of the offset with the normal pressure. Or make the fitting surface relaxation, thus interference quantity must under the premise of considering these two factors determine prudently, effectively under the constant velocity of the amount of interference for NSK import high speed bearings may be invalid. Calculation result if the conflict is too big, Usually it happens only under ultra-high speed) , only take ring under dual lubrication lubrication method and static pressure lubrication method and measures, and this scheme has the potential to hit the 3 million mark NSK DMN value of the imported bearing. When considering the high-speed NSK bearing import clearance not only should consider the above-mentioned factors, and to consider the influence of the axial thermal elongation of clearance, NSK import bearing requirements under the working condition, namely in the working temperature is the best clearance, clearance is, and this, the outer ring groove ball center accurate registration form of the condition. NSK import because of the high speed bearing makes every effort to reduce the relative sliding and internal friction, had better not use relative displacement of the inner and outer ring along the axial approach to adjust the NSK imported ball bearing clearance. Considering the interference fit of NSK bearings imported quantity and clearance, be aware that materials at high temperature becomes soft and easy to deformation characteristics, and many times caused by the temperature change of normal temperature to high temperature must be the possibility of permanent deformation. To host related parts demands high-speed NSK import bearing NSK bearing import precision rotary system of dynamic balance, shaft and NSK import bearing hole installation of the parts should be higher than the general requirements of dimensional accuracy, form and position accuracy, especially the alignment of hole or shaft neck and shoulder verticality, and considering these problems, also must pay attention to the NSK high speed and high temperature factors in the operation of imported bearings. Shaft bearing system requires both high rigidity, asked for a light quality as much as possible, in order to overcome the contradiction, can take measures such as reducing the surface roughness and improve the surface strengthening in order to improve the bearing stiffness, using hollow shaft to reduce the system quality, etc. NSK import bearing the development instance of ultra-high speed, with ultra-high speed HA type development of tapered roller bearing, for example. ( 1) Problems put forward in the gas turbine and some machine and engineering machinery, high speed and large axial load, using NSK imported ball bearing service life is too short, use short cylindrical roller bearing axial load capacity is insufficient, the axial clearance is difficult to adjust, hope to make use of the tapered roller bearing break through this difficult problem. ( 2) NSK import must solve the key technology of improving taper roller bearing is the key of the technology of high speed limit to improve inner ring guard and lubrication condition between the roller large end face, this area the most easily when high-speed developing severe wear and burns, is the main reason for the high speed limit its. ( 3) Solution in the general structure of the tapered roller bearing, lubricating oil circulation route of big guard ring and roller large end face contact parts are hard to come by lubricating oil, explained and the relative sliding, precisely and lubricating oil are needed most. Therefore, Japan and other countries have developed HA type of tapered roller bearings, NSK import bearing guard in the outer ring, so that the circulation of lubricating oil can lubrication outer rim roller and the big end surface contact area, even at rest here at the same time also can save some oil, to avoid the inferior burns accident when starting, but the outer rim according to need to open a few of drainage holes, no discharge channel, to avoid oil retention in some oil mixing power loss and temperature rise too high. As there is no guard inner ring, the temperature decreases, and thus reduce the matching surface between inner ring and the shaft between the possibility of peristalsis. NSK import this kind of structure of the bearing outer ring guided mode to the cage, the cage can be smoothly guide roller is not skewed to normal operation, to avoid vibration and excessive wear, this also is helpful for high speed.