For thrust ball bearings, use the following equation to
calculate the magnitude of life rating L10 given in (Revolutions x 106)
:
Where:
or,
When the bearings balls are larger than 1.00 inch:
or,
When bearings has two or more bearings ball rows the
following equation applies:
and,
Where:
Ca = Load rating Lbs (N)
Pa = Thrust load Lbs (N)
L10 = Rating life (106) fc
= Geometry constant ( manufacturer supplied )
Z = Number of bearing balls in single row and direction of the thrust ball
bearings
D = Bearing ball diameter inches (mm) = Contact
angle degrees
Fr = Radial
applied load Lbs (N)( manufacturer supplied )
Fa = Radial
load factor Lbs (N)( manufacturer supplied )
X = Load factor radial( manufacturer supplied )
Y = Load factor axial ( manufacturer supplied )
Z1, Z2,
and Zn =
Number bearings balls in rows for a multiple row thrust ball bearing
Ca1, Ca2,
and Can = Load rating of each row of
single direction, or multiple row thrust ball bearing.
= Contact
angle degrees
