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Tolerance standard for fit between high temperature bearing and shaft

Release time: June 1, 2018 16:14:00 reading: second

Tolerance standard for fit between high temperature bearing and shaft

① When When the inner diameter tolerance zone and the shaft tolerance zone form a fit, the tolerance code of the original transition fit in the general basic hole system will be changed into the over win fit, such as K5, K6, M5, M6, N6, etc., but the excess tolerance is not large; When the bearing inner diameter tolerance is matched with H5, H6, G5, G6, etc., it is not clearance but over win fit.

② The outer diameter tolerance zone of high temperature bearing is a special tolerance zone because the tolerance value is different from that of the general reference axis. In most cases, the outer ring is fixed in the shell hole. Some high temperature bearing components need to be adjusted, and their fit should not be too tight, often with H6, H7, J6, J7, js6, js7, etc.

Attachment:

Generally, the shaft is marked with 0 ~ + 0.005. If it is not often disassembled, it is + 0.005 ~ + 0.01 interference fit. If it is necessary to frequently disassemble, it is a transitional fit. We also need to consider the thermal expansion of the shaft material when it is rotating, so the larger the bearing is, the better it is - 0.005-0 clearance fit, and the larger clearance fit should not exceed 0.01 clearance fit. There is also a moving ring interference and a static ring clearance.

1. The base hole system is adopted for the high temperature bearing and shaft technetium matching, and the base shaft system is used for the bearing and shell matching. The values of bearing dimensional tolerance and rotation accuracy are in accordance with the provisions of gb307-84 corrosion resistant pump.

2. The journal and the bore in the bearing housing matched with the bearing are in accordance with the provisions of GB 1031-83, and the journal roughness Ra value is less than 1.6 μ m. The roughness Ra value of bearing box hole is less than 2.5 μ m。

3. When GCr15 and zgcr15 steel are used to manufacture bearing rings and rollers, the hardness values of rings and rollers should be 61 ~ 65hrc; When GCr15SiMn and zgcr15simn steel are used, the hardness value should be 60 ~ 64hrc. The inspection method of hardness bottom and the uniformity of hardness of the same part shall be in accordance with jb1255.

4. Check that the radial clearance and axial clearance of the bearing bottom should meet the requirements of gb4604-84 technetium.

5. There should be no spalling and serious wear on the inner and outer ring raceways of the rolling bearing, and the inner and outer rings should have no post crack; The ball should be free from abrasion, cage should not be seriously deformed, there should be no abnormal noise and vibration when rotating, and it should be stopped gradually when stopping.

6. For class C tolerance tapered roller bearing, the contact accuracy between the roller and the raceway bottom of the ring should be used for the pump with a fixed load. After a good coloring inspection, the contact trace should be continuous, and the contact length no should be less than the roller bus bar de 80.

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