The basic static load rating (C0r/C0a) is
a static load of a defined direction and size where the
calculated contact stress of the roller and the raceway at the
contact area under maximum stress is 4,000 (MPa). (Contact
stress exceeding this value may impede rotation.) This value is
indicated as “C0r” or “C0a” in the
dimensional table. When a load is statically or dynamically
applied, it is necessary to consider the static safety factor as
shown below.
| fsr |
Static safety factor for C0r |
| C0r |
Basic static load rating (radial) (N) |
| P0r |
Static equivalent radial load (N) |
| fsa |
Static safety factor for C0a |
| C0a |
Basic static load rating (axial) (N) |
| P0a |
Static equivalent axial load (N) |
Static Equivalent Radial Load P0r
| P0r |
Static equivalent radial load (N) |
| Fr |
Radial load (N) |
Static Equivalent Axial Load P0a
| P0a |
Static equivalent axial load (N) |
| Fa |
Axial load (N) |
| M |
Moment (N·mm) |
| X0 |
Static moment factor(X0=4.6) |
| Y0 |
Static axial factor (Y0=1) |
| Dpw |
Roller pitch circle diameter (mm) |
Static SafetyFactor (fsr, fsa)
(Guideline)
| Load conditions1 |
Lower limit of fsr, fsa
2
|
| Without vibrations or impacts |
2 or greater |
| With vibrations or impacts |
5 or greater |
-
1
In general, factors that cause vibration and impacts
include acceleration and deceleration, sudden starts
and stops, transmission of vibration and impacts from
external devices and machines, and changes in
processing force over time.
-
2
The values in the table above are guidelines for
minimum static safety factors. However, considering
dynamic performance such as service life, we recommend
a value of 7 or above.
