The technial parameter of usually grease

Currently, as bearing design has become diversified, their application range is being increasingly extended, In order to select the most suitable bearings for an application, it is necessary to conduct a comprehensive study on both bearings and the equipment in which the bearings will be installed, including operating conditions, the performance required of the bearings, specifications of the other components to be installed along with the bearings, marketability, and cost performance, etc.

In selecting bearings, since the shaft diameter is usually determined beforehand, the prospective bearing type is chosen based upon installation space, intended arrangement, and according to the bor diameter required.

Next, from the bearing specifications are determined the service life required when compared to that of the equipment in which it is used, along with a calculatin of the actual service life from operatinal loads.

Internal specifications including bearing accuracy, internal clearance, cage, and lubricant are also selected, depending on the application.

For reference, general selection procedure and operating conditions are described in Fig. 2-1. There is no need to follow a specific order, since the goal is to select the right bearing to achieve optimum performance.

(Operating conditions to be considered )
Installation space
Load magnitude, types and direction of application
Rotation speed
Running accuracy
Noise characteristics, friction torque
Mounting ease
Bearing arrangement
Marketability, cost performance

(Other data )
Comparison of performance of bearing types
Example of bearing arrangement
Specifications for installation
Recommended service life
Dynamic equivalent load
Static equivalent load, safety factor
Rotation speed

Bearing boundary dimensions
Beasic dynamic load rating
Basic static load rating
Allowable axial load
(for cylindrical roller bearing with rib)
Running accuracy (runout)
Noise characteristics, friction torque
Rotation speed

Bearing tolerances
Load magnitude, types
Operational temperature distribution
Materials, size and tolerances of shaft and housing
Difference in temperature of inner and outer rings
Rotation speed

Bearing tolerances
Bearing internal clearance
Rotation speed
Noise characteristics
Conditions of application site
(abnormal temperature, sea water, vacuum,
chemical solution, dust, gas, magnetism)


Special bearing materials
Special heat treatment
(dimension stabilizing treatment)
Special surface treatment
(Reference) EXSEV bearing series
Operational temperature
Rotation speed
Sealing device

Rotation speed limit
Grease service life
Mounting and dismounting

Mounting dimensions
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