The most important thing is how to set the gap when installing Please answer more details, thank you! FiftySometimes it can be adjusted automatically by some methods. What is the method?
When purchasing bearings, the bearing's internal clearance, there is a factory standard. In practical use, the effective clearance has been greatly reduced by matching with other parts, temperature difference and so on. According to the calculation of some manufacturers, in theory, the fatigue life is the longest when the effective clearance is slightly negative.However, it is difficult to maintain this ideal state when practical use, so the general effective clearance is slightly greater than zero, which is the best choice! A variety of coordination and clearance adjustment are to achieve this goal.In addition, pairs of bearings (in the two column as an example) generally have back-to-back (DB) installation, face to face (DF) installation, series (DT) installation. If you know the combination method, for example: know back to back combination, buy the bearing model directly with DB word bearing, come back directly locked, everything OK! If you can't remember, it doesn't matter. There's an arrow on the outer ring of the bearing, as long as the upper arrow is enough!At present, foreign brands are equipped with any group of bearings (NSK, SU and DU words, FAG has the word "S.U", "SKF", "CB", "GA" and so on) need to adjust the clearance.
On the buttocks buttocks, face can be installed, the installation clearance depends on how to set up the experience, I usually tighten by hand, starting one or two minutes, stop and then hand twist, if the screw does not move with the board, gently tighten up lock.
Methods: after the bearing was taken, a ferrule was fixed and the relative displacement of the other ring (the clearance of the factory) was measured first, and several measurements were taken to record the average value of the ring!Measure relative displacement while installing.When the initial displacement is measured, the calculated decrease due to thermal expansion (theoretical calculation is sometimes negligible) is calculated By subtracting the displacement caused by fit and fastening, a little longer than zero, stop fastening and start the test machine!Tapered roller bearings: when back to back installation, assume that the distance of the inner ring of the two bearings is zero, and measure the distance between the outer rings, record the distance between them! When installed, one side of the installation measurement, and ultimately consistent with the original record (can be regarded as a zero clearance). If you don't worry about it, then make the spacer ring. The width is the same as the measuring distance. (the accuracy and roughness of the ring must be ensured. The material is aluminum alloy.). The same is true of other combinations!Another: TIMKEN has a ready set of assembly numbers based on whether the user has a negative clearance. Direct buying can save a lot of money (in fact, it's hard to buy and it's not cheap to buy)By measuring and calculating, or by adding shims or spacers, it is believed that the misjudgment of judgment is more reliable than merely empirical judgment!Also: if pairing is used, it is recommended not to buy bearings without combination marks or low accuracy. If you buy it, it's difficult to adjust (the calculated values are often inaccurate).
