I. Rolling bearing

① when bearing inner diameter tolerance zone and shaft tolerance zone constitute with, in general base hole system in the original is a transition with the tolerance code will become over win with, such as k5, k6, m5, m6, n6, etc., but over win amount is not large; when bearing inner diameter tolerance generation and h5, h6, g5, g6, etc. constitute with, not in the gap and become over win with.

② bearing outer diameter tolerance zone because the tolerance value is different from the general benchmark shaft, is also a special tolerance zone, in most cases, the outer ring installed in the shell hole is fixed, some bearing parts structure requirements and need to adjust, its with should not be too tight, often with H6, H7, J6, J7, Js6, Js7, etc. with.

Attachment.

In general, the shaft is generally marked 0 ~ +0. 005 If it is not often dismantled, it is +0. 005 ~ +0. 01 of the interference fit can be, if you want to often the disassembly is the transition fit can be. We also need to consider the thermal expansion of the shaft material itself when rotating, so the bigger the bearing is, the better it is -0.005～0 clearance fit, and the maximum should not exceed 0.01 clearance fit

1、Bearing and shaft fit use base hole system, bearing and shell fit use base shaft system.

Bearing size tolerance and rotational accuracy value according to GB307-84 corrosion resistant pump.

2、The journal and inner hole of the bearing box are in accordance with GB1031-83, the roughness Ra of the journal is less than 1.6μm, and the roughness Ra of the inner hole of the bearing box is less than 2.5μm.

3, with GCr15 and ZGCr15 steel manufacturing bearing collar and roller, its collar and roller hardness value should embankment 61 ~ 65HRC; with GCr15SiMn and ZGCr15SiMn steel manufacturing, its hardness value should embankment 60 ~ 64HRC. hardness bottom inspection method and the same parts of the hardness uniformity according to JB1255 regulations.

4, check the bearing bottom radial clearance and axial clearance should be in line with GB4604-84Tc provisions.

5, rolling bearing inner and outer ring raceway should be no spalling, serious wear, inner and outer ring are no after cracks; ball should be no wear, keep frame no serious deformation, no abnormal noise and vibration when rotating, stop should gradually stop gorge.

6, for C-level tolerance tapered roller bearings, its roller and the bottom contact accuracy of the ring raceway, water pump with a certain load for shrimp, into a good coloring check, contact traces should be continuous, the contact length no should be less than the roller bus line de 80.

Second, slide bearing

1、For radial thick wall tile

① with pressure lead method, lift shaft method or other methods to measure the bearing clearance and tile shell pot Ying amount, shaft clearance in line with the use of the request, tile shell Guo Ying amount should embankment 0 ~ 0.02mm.

② check the components, there should be no damage and cracks, shaft tile should be no spalling, porosity, cracks, grooves and partial wear and burn situation.

③ shaft tile and journal de contact condition with coloring method check, check the angle should be no 60 ° ~ 90 ° (speed higher than 1000 r / min technetium take isthmus limit, speed lower than 1000 r / min technetium take high head limit). Bring contact range to seek contact uniformity, each square centimeter should be after 2 ~ 4 pairs of contact points, if contact no good, then must into the good scraping research.

④clean the bearing box, each oil hole smoothly, no get after the crack, leakage phenomenon.

⑤ tile back and bearing seat should be close and even fit, with coloring method check, contact area no less than 50.

2、For radial thin wall tile

① shaft tile de alloy layer and tile shell should be firm and tight soil combination, no after delamination, shell off phenomenon. Alloy layer surface and two halves of the tile inside the bottom part of the surface should be smooth, flat, no promise after cracks, porosity, heavy skin, slag and bruises and other defects.

② tile back and bearing seat bore surface should be close and even fit, with coloring method check, inner diameter less than 180mm, its contact area no less than 85, inner diameter fat than or equal to 180mm bottom, its contact area no less than 70.

③ shaft tile and journal with clearance and contact condition beat by machining accuracy to ensure, its contact area generally no promise scraping, if along the axial contact no uniform, can be slightly trimmed.

④After assembly, with 0.02mm inside part of the surface at the plug ruler check, should not be able to plug into the embankment qualified.

3、For thrust bearing

① shaft tile should be no wear, deformation, cracks, scratches, delamination, crushing and burn defects; and thrust disc contact should be uniform, contact area should be no less than 70 and the whole circumference of the block evenly; the same group of block thickness difference should be no fat than 0.01mm, block pasteurized alloy should be according to the direction of rotation repair round into the oil wedge, with the benefit of lubricating oil to enter; back bearing surface smooth and smooth.

②Adjustment shim should be smooth, flat, no deflection, with thickness diffearence no fat than 0.01mm to a layer of shim.

③ with bearing cover assembly after repeatedly using the push shaft method to measure the thrust bearing clearance, its value should be brought to the range. With that kind of method measurement and with the shaft displacement probe side of the German thrust bearing clearance must be consistent, and according to the provisions of the adjustment rod displacement probe bottom indication zero position.

④ bearing shell level combined surface tightly, no misalignment. Measure the oil temperature bottom oil hole and tile cover eye alignment, no skew. Oil hole clean and smooth.