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High speed bearings and plain bearing, high speed bearings and plain bearing the difference between knowledge introduction - bearing

by:Waxing     2020-06-03
High speed bearings and plain bearing: the difference between high speed bearing is higher than the accuracy of the vulgar bearing, the surface roughness is smaller. Is the visual difference, high-speed bearing surface more smooth than vulgar bearing, outer ring and inner ring shaking, high-speed bearing clearance is smaller. General high-speed bearing refers to the bearing rate of 60 meters per second. Bearing high speed, medium speed and low speed not to speed but surely with linear velocity. Tens of thousands of small bearing easily turn not high-speed bearing, extra large bearing a few hundred even if high-speed bearing. In the sliding bearing, hydrostatic bearing, fluid dynamic pressure bearing, aerostatic bearing, gas dynamic pressure bearing is fit for high speed rotation. High speed bearings and plain bearing, high-speed bearing installation and adjustment of 1. High-speed bearing fit and clearance due to high-speed bearing should be in accordance with the requirements of high precision bearings, and according to the requirements of high temperature bearing, 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, from the choice of coordination and clearance to strive to maintain the accuracy and working performance of the bearing, it is difficult. Order to ensure the rolling bearing is installed a little deformation, KOYO 7319 ac angular contact ball bearing of the interference fit interference quantity cannot 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 matching 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 high-speed bearing may be invalid. Calculation result if the conflict is too big, Usually it happens only under ultra-high speed) , only take ring lubrication and hydrostatic lubrication and lubrication measures, and this scheme has the potential to hit the 3 million mark DMN value of the bearing. On the surface of the high temperature thermal expansion, or offset with normal pressure. Or make the matching 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 high-speed bearing may be invalid. When considering the high-speed bearing clearance not only should consider the above-mentioned factors, and to consider the influence of the axial thermal elongation of clearance, bearing under working state, 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. Due to the high speed bearing makes every effort to reduce the relative sliding and internal friction, SKF 71900 c/DB angular contact ball bearing had better not use relative displacement of the inner and outer ring along the axial approach to adjust clearance of ball bearings. Considering the amount of the interference with the bearing clearance, and 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. 2. Demands high-speed bearing bearing to host related parts precision rotary system of dynamic balance, shaft and hole bearing installation of the parts should be higher than the general requirements of dimensional accuracy, form and position accuracy, NACHI bearings especially coaxial degree of hole or shaft neck and shoulder vertical degree, and to think about these problems, also must pay attention to the high speed and high temperature factors in the operation of the bearing. 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.
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