What are equal-section thin-walled bearings?
What are equal-section thin-walled bearings?
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Japanese NSK bearings technical standards and matters needing attention
by：Waxing
2020-11-16
Japan NSK bearing source of technical standards and matters needing attention: bearing | last updated: - 2020
07 -
27 Japanese NSK bearings technical standards and note 1, with the bearing and shaft adopts the basic hole system, non-standard bearings with the shell with the use of basic shaft system.
Bearing dimensional tolerance and revolving tolerance values according to GB307 -
The provisions of the 84.
2, cooperate with bearing journal and bearing of the hole in the cabinet by GB1031 -
The provisions of the 83 journal roughness Ra value is less than 1.
6 microns, bearing hole roughness Ra value is less than 2 in the box.
5μm。
3, made of GCr15 and ZGCr15 steel bearing ring and roller, the ring and roller hardness value should be 61-65 HRC;
With GCr15SiMn and ZGCr15SiMn steel manufacturing, its hardness value should be 60 ~ 64 HRC.
Hardness test and the uniformity of the hardness of the same parts as JB1255 rules.
4, check the bearing radial clearance and axial clearance shall comply with GB4604 -
The provisions of the 84.
5, inner and outer ring raceway of bearing should be no peeling, serious wear and tear, can not have both internal and external ring crack;
Ball should be no wear, keep no serious deformation, turns, no abnormal noise and vibration should be gradually stop stop.
6, for C grade tolerance of tapered roller bearings, roller and ring raceway contact precision, to a certain load, under the action of staining examination, contact traces should be continuous, contact length should not be less than 80 of roller busbar.
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