Prevent KA Nylon Retainer Bearing erosion maintenance
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| Time：2017.11.18 News Sources：Shandong Xinkaite bearing Co.,Ltd. Views：
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KA Nylon Retainer Bearing is different because of the different environments, so the erosion is different because of the different erosion patterns. Bearing, of course, can not escape the erosion of the fate, the following is a talk about bearing erosion three ways.
1. Cavitation erosion
The cavitation of KA Nylon Retainer Bearing is the surface damage form when the solid surface is contacted with liquid and moves relatively. When the lubricating oil in the oil film in the area of low pressure, oil will form a bubble, the bubble movement to the high pressure area, under the pressure of bubble collapse, great impact and high temperature in the collapse moment, repeated action of solid surface in this impact force, material fatigue loss, the friction surface of small the pits, and then developed into a cavernous scar. Cavitation erosion often occurs in bearings with heavy load, high speed and large load and speed change;
2. Fluid erosion
The fluid erosion of KA Nylon Retainer Bearing means that the fluid strongly impacts on the solid surface and causes the erosion of the fluid, which makes the surface of the solid surface appear spot scars, and the surface of the damage is smoother;
3. Electrical erosion
Electrical erosion of bearings refers to the electric spark produced by the leakage of electric motors or electric appliances, which produces friction on the surface of the KA Nylon Retainer Bearing friction surface. It is characterized by the damage reciprocating on the hard surface of the journal.
In order to predict the fatigue life of KA Nylon Retainer Bearing and judge the remaining life, it is necessary to understand all the fatigue failure phenomena of bearings, which will take a long time. However, because rolling fatigue occurs at the contact point under compressive stress, a large material change will occur if the damage is reached. Therefore, in addition to the appearance of early cracks, chemical effects of raceway, and crack propagation prior to the change of material, testing the change of materials may judge the fatigue of bearings.
Remove the old grease from bearing, journal and cavity, clean the bearing and shaft neck with cleaning agent and dry with cloth. Finally clean the inner cavity with cloth.
Check the bearing and bearing ring, find the cracks, fatigue spalling and loose bearing roller and so on, should replace the bearing. If it is found that pitted the bearing rings, bearing should be replaced.
Check the KA Nylon Retainer Bearing internal diameter and shaft neck fit, the clearance should not be greater than 0.10mm, when measuring the shaft neck, should be vertical in the upper and lower parts of the ground (where is the largest wear parts) measurement two. If the clearance exceeds the specified limit, the bearings should be replaced so as to restore the normal clearance. Do not allow the burr, in shaft neck pits to narrow the gap.
After all parts meet the requirements, the inner bearing is painted with grease and placed in the middle. When lubricating grease is applied to the inner cavity of KA Nylon Retainer Bearing, grease should be squeezed into the bearing until the grease comes out of the other side of the bearing. With a thin layer of grease in the cavity and the head cover, which plays the role of anti rust. Dont smear too much grease in the cavity, otherwise it will affect the heat dissipation and brake.
The outer bearing is installed on the shaft neck, and the nut is adjusted by hand, then the nut is tightened and tightened with the axle wrench according to the specified torque. After tightening the nut, it should be rotated several times to see the installation of the bearing; on the other hand, the bearing and the seat ring are properly matched by rotation. At this time, the bearing tightness is appropriate, the wheel is free to rotate and can not feel the axial clearance.
Finally, the locking piece, the fixing nut, the tyre, the dust cover and the decorative cover are arranged in turn.
KA Nylon Retainer Bearing after adjustment, driving a mileage (about 10km), parking inspection, for the temperature of the swab, if the heating, for the bearing adjustment too tight, should be re adjusted, properly relax the bearing tightness.
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