This page explains techincal calculation tool provided by JTEKT.
Please click below if you want to use technical calculation tool.
Technical calculation tool for grease service life.
This function calculates the grease life in single row shielded/sealed type ball bearings employing steel shields or rubber seals.
This calculation can be applied in the range specified below.
a) Operating temperature: (T)
The calculation is applicable when T120C. (However, when T50C, T = 50C.)
When T120C, consult Koyo.
b) dmn value
The dmn value is calculated based on the pitch circle diameter of rolling elements (dm) and rotational speed (n).
The calculation is applicable when dmn50 x 104.
(However, when dmn12.5 x 104,dmn = 12.5 x 104.)
When dmn50 x 104, consult Koyo.
c) Loading conditions
The calculation is applicable when Pr/Cr0.2. (However, when Pr/Cr0.05, Pr/Cr = 0.05.)
When Pr/Cr0.2, consult Koyo. The dynamic equivalent radial load is calculated in the program based on the entered radial load and axial load.
Enter the magnitude of load on the bearing in the radial direction (at right angles to the rotating axis).
Enter the magnitude of load on the bearing in the axial direction (parallel to the rotating axis).
Enter the temperature of the bearing during operation.
Enter bearing rotational speed.
Dynamic equivalent radial load
The equivalent radial load obtained based on the radial load and axial load is shown.
The calculated grease life is shown.