Rolling bearings according to DIN ISO 281

The calculation module for roller bearings allows to calculate the rating life and the expanded modified rating life according to DIN ISO 281 including supplement 1 (2003-04). A calculation with load collectives is also possible. Here you can define any number of load cases. For the single load case, the following settings are possible: Frequency (part of time), radial and axial force, temperature and cleanness. You can save and open the load collectives independently of the active bearing calculation. The following kinds of rolling bearings are provided for the calculation:

• Deep groove ball bearing (single row)
• Deep groove ball bearing (double row)
• Angular contact ball bearing (single row)
• Angular contact ball bearing (double row)
• Self-aligning ball bearing
• Four point bearing
• Tapered roller bearing (single row)
• Cylindrical roller bearing (single row)
• Spherical roller bearing
• Ball thrust bearing (single row)
• Spherical roller thrust bearing

The comfortable database provides nearly 20.000 bearings of the producer NSK, SKF, SNR and KOYO. After the selection of the producer, the kind of bearing and the input of the loads, the user can select the desired bearing from a table. As an alternative to the selection from the table, the user can use the selection search for the fast and comfortable bearing identification. For the bearing search, the following parameters can be used:

• inner bearing diameter
• outer bearing diameter
• wide of bearing
• on basis of the defined loads, the calculated rating life and expanded modified rating life
• max. speed for oil or grease lubrication

The parameters can be defined for a certain range. Additionally the own input of a bearing is possible too.

Additional an increased bearing clearance C3 or C4 for deep groove ball bearings was integrated into the bearing calculation module. This option can be chosen in the bearing selection. In the bearing selection, the option for the appropriate deep groove ball bearing can be selected.
Please note: For using this option, it is recommended to use the bearing clearance that exists after the assembly of the bearing under operating conditions.

For the calculation of the expanded modified rating life, several oils and greases can be selected from the integrated database. An own input of data for the lubricant is also provided. The database includes more than 150 products of the following companies:
Lubricant Consult, Klüber, Fuchs Lubritech, Aral and BP.

Additional to the settings for the requisite reliability, operating temperature and cleanness under operating conditions are taken into consideration in the calculation.

In the result overview the rating life, expanded modified rating life and the static identification number are displayed. In addition, serveral diagrams are available:

Rating life as function of

• radial force
• axial force
• speed
• cleanness
• temperature and
• viscosity of lubricant

The detailed results are given in a report. The calculation report is available in HTML and PDF.