Automotive water pump bearing the marking methods

Basic Code-behind Code
Series Shaft d sets of diameter D length B
1, uppercase Lading An female representation structure is different
2, the same numbers indicate the sequence number of the basic make-inch
WB
WR
3. Material selection and heat treatment:
Use conventional shaft taper roller bearing steel (including shafts, outer ring, Ball & Roller) high carbon chromium bearing steel (GCr15). Because high-quality bearing steel smelting by vacuum deoxidation, electromagnetic stirring, oxide content is less, the contact pressure can withstand greater stress while the hypervariable withstand greater tensile stress by heat treatment, the hardness of the shaft raceway to 58-62HRC. Department raceway hardness of 60-64HRC, ball and roller hardness is 61-65HRC. When the shaft, outer carburizing bearing steel, the raceway hardness of 60-64HRC. Cage material usually used reinforced nylon 66, a ring of material generally use NBR, when asked high, can also be used expensive fluorine rubber seals.
4. Clearance:
Manufacture conventional shaft bearing radial clearance clearance basis: in the absence of specific requirements, the no-load case, radial clearance is 15-35um, the user reasonably choose to sit the hole with the outer ring and the interference volume is very important, too large amount of interference causes the bearing radial clearance dropped, and damage the bearing, so that the pump does not work, practical work, in addition to the above reasons, but also need to take into account the temperature rise caused by thermal expansion that clearance decreases, it is generally recommended amount of interference as follows:
Bearing outside diameter D (mm) casing diameter deviation (um)
Steel pump aluminum pump
30 The following 25-4535-55
30 or more 32-5555-76
5. Lubrication:
As the pump shaft bearing work at high speed, high temperature conditions, lubrication conditions directly affect the shaft connected to the shaft for the life of high dropping point should be adopted, thickening of the better imported high grease seal is often used large radial interference contact seals to ensure long bearing losing oil.