Let’s learn about bearing tolerance on shaft with bearing manufacturer

1.Bearing tolerance on shaft For radial thick wall tiles

① Use the lead pressure method, the bearing tolerance on shaft lifting method, or other methods to measure the bearing clearance and the amount of space between the shell and the shell. Bearing tolerance on shaft shaft clearance must be obtained.

② Check all parts, there should be no damage and cracks, and the bearing pads should be free from spalling, pores, cracks, channels and uneven wear.

③ The contact condition between the bearing pad and the journal should be checked by coloring method, and the inspection angle should not be 60 ° ～ 90 ° (the rotation speed is higher than 1000r / min (take the isthmus limit, and the rotation speed is lower than 1000r / min), take the high head limit). Take contact within the contact range to achieve uniform contact. Each square centimeter should be followed by 2 to 4 pairs of contact points. If the contact is good, you must perform a good scraping.

④ clean the bearing box, each oil hole is unobstructed, no cracks or leaks.

⑤The tile back and the bearing seat should be tightly and evenly attached. Check with coloring method. The contact area no is less than 50.

2, Bearing tolerance on shaft for radial thin-walled tiles

①The bearing tolerance on shaft-wad alloy layer and the tile shell should be firmly and tightly combined with each other. The surface of the alloy layer and the bottom face of the two and a half tiles should be smooth and flat, and no cracks, pores, heavy skin, slag inclusion, and bumps will be allowed after the promise.

② The back of the tile and the inner hole surface of the bearing seat should be closely and evenly adhered. Check with coloring method. If the inner diameter is less than 180mm, the contact area no is less than 85, the inner diameter is less than or equal to 180mm, and the contact area no is less than 70.

③ The clearance and contact conditions between the bearing pad and the journal depend on the machining accuracy to ensure that the contact area is generally no, and it is allowed to be scraped. If the contact is uniform along the axial direction, it can be slightly trimmed.

④ After assembly, check the inside face of the belt with a feeler gauge of 0.02mm.

3. Bearing tolerance on shaft for thrust bearings

① The bearing pads should be free of wear, deformation, cracks, scratches, delamination, crushing and burn defects; the marks on the contact with the thrust plate should be uniform, the contact area should be no less than 70 and all the tiles on the entire circumference should be evenly distributed; the same group The thickness difference of the tile should be less than 0.01mm, and the tile pasteur alloy should be rounded into the oil wedge according to the direction of rotation, and it should be entered with a good lubricating oil; the back bearing surface is smooth and smooth.

② The adjusting gasket should be smooth, flat, and no deflection. Use a thickness of 0.01mm to obtain a layer of gasket.

③ After the bearing cap is assembled, the thrust bearing clearance is repeatedly measured by the bearing tolerance on shaft method. The value should be taken within the range. The method used to measure and use the axial displacement probe side bearing tolerance on shaft-- thrust bearing clearance must be consistent, and adjust the rod displacement probe bottom indication zero position according to regulations.

④ The horizontal joint surface of the bearing shell is tight, and no misalignment. The oil hole at the bottom of the oil temperature measurement is aligned with the tile cover eye. The oil holes are clean and free.

4.Bearing tolerance on shaft for rolling bearing

 ① When the bearing inner diameter tolerance zone and the bearing tolerance on shaft tolerance zone form a fit, the tolerance code that was originally a transition fit in the general base hole system will become an overmatch, such as k5, k6, m5, m6, n6, etc. Large; bearing tolerance on shaft--when the bearing inner diameter tolerance is matched with h5, h6, g5, g6, etc., it is not a gap but an overwhelming fit.

② The bearing outer diameter tolerance band is a special tolerance band because the tolerance value is different from the general reference bearing tolerance on shaft. In most cases, the outer ring is fixed in the housing hole. bearing tolerance on shaft--Some bearing components require structural adjustments and their fit is not suitable. Too tight, often with H6, H7, J6, J7, Js6, Js7 and so on.

In general, the bearing tolerance on shaft is generally marked with 0 ~ + 0. 005 If it is not frequently disassembled, it is an interference fit of +0. 005 ~ + 0.01. If it is often disassembled, it is a transition fit. bearing tolerance on shaft--we also need to consider the thermal expansion of the shaft material when it is rotating, so the larger the bearing, the better it is -0.05 ~ 0 clearance fit, and the maximum should not exceed 0.01 clearance fit.

Another is the interference of the moving coil and the gap of the static coil.

1. Bearing tolerance on shaft adopt the basic hole system, and the bearing tolerance on shaft and the housing adopt the basic bearing tolerance on shaft system.

The values ​​of bearing dimensional bearing tolerance on shaft and rotation accuracy are in accordance with GB307-84 corrosion resistant pump.

2. The bearing tolerance on shaft journal and the inner hole of the bearing box that are matched with the bearing are in accordance with GB1031-83 . The roughness value of the journal is less than 1.6μm, and the roughness value of the hole in the bearing box is less than 2.5μm.

3. bearing tolerance on shaft--When using GCr15 and ZGCr15 steel to make bearing rings and rollers, the hardness value of the rings and rollers should be 61 ~ 65HRC; when made of GCr15 SiMn and ZGCr15SiMn steel, the hardness value should be 60 ~ 64HRC. bearing tolerance on shaft--The hardness bottom inspection method and the uniformity of the hardness of the same part shall be as specified in JB1255.

4. bearing tolerance on shaft--Check that the radial clearance and axial clearance at the bottom of the bearing are in accordance with GB4604-84 .

5. The inner and outer raceways of the rolling bearing should be free from spalling and severe wear, and the inner and outer races should be free of cracks; the balls should be free of abrasion, the cage should not be seriously deformed, and there should be no abnormal noise and vibration when rotating, and the gorge should be gradually stopped when stopping.

6. For class C tolerance tapered roller bearings, the accuracy of the contact between the roller and the bottom of the raceway of the raceway. The pump should be loaded with shrimp. Use a good coloring check. The contact trace should be continuous and the contact length no should be less than the roller. Child bus de 80.

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