2. BEARING SELECTION PROCEDURE

1 2. BEARING SELECTION PROCEDURE Examination of fitting Evaluation of accuracy Page number Page number The number of applications for rolling bearings is Then the size of the BEARING is chosen to satisfy the A19. A Operating conditions A82. A Running accuracy almost countless and the operating conditions and desired life requirement. When doing this, in addition A Rotational stability A18, A37, A81. A Magnitude and character- A82, A83. environments also vary greatly. In addition, the diversity to fatigue life, it is necessary to consider grease life, A Torque fluctuation A19 istics of loads of operating conditions and BEARING requirements noise and vibration, wear, and other factors.

2 A Temperature range A83. A Materials, size , accuracies A84, A100. continue to grow with the rapid advancement of There is no fixed PROCEDURE for selecting bearings. It is SELECTION of BEARING of shaft and housing technology. Therefore, it is necessary to study bearings good to investigate experience with similar applications carefully from many angles to select the best one from and studies relevant to any special requirements for accuracy class the thousands of types and sizes available. your specific application. When selecting bearings for Page number Determination of fitting Usually, a BEARING type is provisionally chosen new machines, unusual operating conditions, or harsh Examination of A Fitting considering the operating conditions, mounting environments, please consult with NSK.

3 Internal clearance A Difference in temperature A95. arrangement, ease of mounting in the machine, The following diagram ( ) shows an example of between inner and outer allowable space, cost, availability, and other factors. the BEARING SELECTION PROCEDURE . rings A Speed A Misalignment of inner and A18. outer rings A Amount of preload A98. Determination of internal clearance A Operating conditions and required Examination of special performance specifications Study of cage Page number A Environmental conditions A Speed A Operating temperature A57. A Dimensions of shaft and housing A Noise A Operating temperature A Environment (seawater, A External vibration and shock vacuum, gases, chemicals, Page number A Rapid acceleration and etc.)

4 Evaluation of A Allowable space A18, A38 A Type of lubrication BEARING types Magnitude and direction of loads deceleration A A18 A Moment load and misalignment A Vibration and shock A18. A Operating speed, maximum speed A18, A37 SELECTION of special A Misalignment of inner and outer A18 material, heat treatment SELECTION of cage type rings for dimensional stability A Fixing in axial direction and mounting and material A20 to A23. arrangement A Ease of BEARING mounting and A19 Page number dismounting Examination of A Operating temperature range A106, A107, A110, A112. A Sound and torque A19 lubricating A Speed A37.

5 A Required rigidity A19, A96 methods A Lubricating methods A105. A Availability and cost A Type of seals A102. A Maintenance and inspection A123. intervals Determination of BEARING type and mounting SELECTION of lubricating arrangement method, lubricant, and type of seals Page number Page number Determination of A Expected life of machine A24, A25 Examination of A PROCEDURE for mounting and A116, A121. BEARING size A Dynamic and static equivalent loads A30, A32 ease of mounting/ dismounting A Speed -- dismounting A Necessary equipment A116, A121. A Permissible static load factor A32 A Dimensions affecting A100.

6 A Permissible axial loads (in the case of A33 mounting cylindrical roller bearings). Determination of dimensions affecting mounting and Determination of BEARING size PROCEDURE for mounting/. dismounting Fig. Flow Chart for SELECTION of Rolling Bearings Final specifications for BEARING and surrounding parts A 16 A 17. 16-17 11/20/13 4:49:36 PM.