11 Rolling Contact Bearings

Photo displaying various rolling contact bearings.

Nomenclature

A
axial load, N
C
basic dynamic load rating, N
C 0
basic static load rating, N
e
factor
F a
external axial load, or thrust force, N
F r
external radial load, or radial force, N
f p
load factor
f t
temperature factor
H
total operating hours under variable loads, h
L h
bearing life in hours, h
L 10
rated life at reliability of 90%, rev
L 10h
rated life in hours at reliability of 90%, h
L n
bearing life at diffident reliability, h
[L h ]
allowable life in hours, h
N i
reaction force, N
n
rotational speed, rpm
P
equivalent dynamic load, N
P 0
equivalent static load, N
P i
resolved radial load component, N
R
radial load on bearing, N
r 1
radius of bore, mm
r 2
radius of rolling elements, mm
r 3
radius of outer ring, mm
r 4
radius of retainer, mm
S
induced thrust load, N
S′
appended thrust load, N
S 0
static safety factor
S i
resolved axial load component, N
t
temperature, °C
X
dynamic radial load factor
X 0
static radial load factor
Y
dynamic axial load factor
Y 0
static axial load factor
α
contact angle, deg.
α 1
life‐adjustment factor for reliability
ε
load‐life exponent
θ
angular deviation, deg.
ω 1
angular velocity of inner ring, rad s−1
ω 2
angular velocity ...

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