Supply of automotive water pump bearings

As the car forward speed, high reliability, low power consumption direction of

development, the cooling water pump also requires to light weight, small size,

high flow, high-speed direction, the shaft bearing is a bearing capacity,

rigidity, rotary, high precision, long life, reasonable structure, reliable

operation of the new bearings. Currently, the only widely used in automobile

cooling water pump in the tungsten carbide plate, engineering machinery etc. have also

been widely used.

1. Product Scope and Structure Description:
Series Structure Description
WB double row ball water pump bearing
WR
A ball a roller water pump bearing
2. 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 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.