In 2016 jiaxing bearing knowledge: bearing assembly error theory analysis

There is rotational, have HRB bearing ( ) In 2016 jiaxing bearing knowledge: bearing assembly error theory analysis. Jiaxing bearing group sales co. , LTD. ( The company) Is in jiaxing bearing group set up by the spot sales window, specializing in HRB brand bearings, existing stocks of 50 million yuan, covers the whole bearing, have very strong cash supply ability. 1, inside and outside the circle is not in the same rotation center, causing axis deflection axis deflection is a widespread phenomenon in the actual operation bearing, axis deflection is one of the main reasons of thrust bearing failure. The reasons are: (in bearing and shaft is wrong 1) Axis tilt; （ 2) Rotor installation error; （ 3) Rotor manufacturing error; （ 4) Shaft, rotor and bearing of thermal elastic deformation occurring during operation. Axis deflection caused by the oil film thickness and pressure distribution of each, tile surface temperature are not the same, which had a great influence on the oil film thickness and pressure distribution, less effect on the tile surface temperature distribution; Axis deflection of bearing inner causes uneven fluid dynamic pressure, lead to shaft swings in the oil film force, with the increase of deviation degree, the fluctuation of oil film force more serious; In the lubrication state, small oblique Angle change will cause the minimum oil film thickness and maximum stress significantly change, but the highest tile surface temperature change is very small. Above all, axis deflection caused by bearing oil film thickness is not uniform, may lead to the oil film is broken, and the bearing failure. When installation, as much as possible in order to keep together, the best solution is to use the overall structure of the crust, and the installation of bearing two hole boring out at a time. Such as on a shaft is equipped with different sizes of bearings, bearing hole on the shell should still be a boring, then can use smaller bearing liner to install size. When two points on the two shells, bearing hole should be the two shells together is boring. 2, installation does not reach the designated position, there is deviation or not installed to the bearing, bearing clearance caused by too small operation, the temperature of the shaft is generally higher than the temperature of the outer ring, axial and radial thermal expansion will be bigger than the thermal expansion of the shell, if the bearing clearance is too small, could lead to a stuck. 3, turn the circle and the fixed ring too close coordination with the bearings with kinds of selection, should according to the size of the bearing type and size, load and the direction and the nature of the load, etc. Correct selection of bearing fit should guarantee the bearing function, prevent the inner ring and shaft, outer ring and shell hole relative rotation occur at work. Generally speaking, when the direction of the working load constant, turn the circle than in those without moving coil have a tighter fit, because the rotating ring spinning under load, rather than moving coil under partial load. When the higher the speed, the stronger the more load and vibration, should choose the more tight fit. When the bearing installed on thin-walled shells or hollow shaft, also should use a tight fit. But tight fit is bad, maybe because of inside and outside the circle the elastic expansion and contraction of the outer ring of bearing internal clearance diminish or even disappear completely, also may be due to the combination of the shaft and hole on the surface of the irregular shape, or uneven rigidity and bearing inner and outer circle irregular deformation, which will damage the bearing's normal work. Tight fit still can make installation difficulties, especially for heavy machinery. 4, the installation process, is the use of assembly pretightening loads imposed by external forces in the process of giving appropriate pre-tightening load bearing. Starts to make the prestressing force bearing clearance work, reducing the support stiffness and rotation accuracy, vibration and noise. Pre-tightening force is too big, can increase the rolling element and the inner and outer ring raceway of friction, temperature rise during operation too fast, reduce the transmission efficiency, reduce the bearing life. Only apply appropriate pre-tightened force can eliminate the axial clearance, reduce the reverse error, improve the axis rotation accuracy, reduce the vibration and noise. Gives bearing pre-tightening force, even if the bearing after a certain time of operation, slight changes, the relative position of bearing load in advance can still remain stable in the position of bearing inner and outer ring, so when installation of prestressing force control is very important. 24-hour customer service hotline: if you are more interested in jiaxing bearing manufacturer introduces industry information or have any questions, please click on contact us page on the right side of the online customer service, or call:, you close the way of jiaxing bearing purchasing advisors. - - - - - - - - - - - Editor: HRB bearing company sourcing consultant LTD. All rights reserved, The company) Reprint please indicate the source