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2-7
How to obtain the life under oscillating movement
Obtain the life of the bearing under oscillating movement by Formula (8).
● Formula (8)
10
6
Loc
=
×
60
×
n
1
Symbols of Formula (8)
Rated life under oscillating
Loc
movement
Number of reciprocating
n1
oscillations per minute
Basic dynamic load rating
C
Dynamic equivalent radial
Pc
load coefficient
Load coefficient
fw
Oscillating angle/2
θ
2-8
How to obtain the static safety coefficient
In general, the basic static load rating (Co) is considered to be the permissible limit of the static
equivalent load. However, obtain the limit based on the operating and required conditions.
Obtain the static safety coefficient of the cross roller bearing by Formula (9). General values under the
operating condition are shown in Table 4. You can obtain the static equivalent radial load (Po) by
Formula (10).
●Formula (9)
Co
fs
=
Po
Symbols of Formula (9)
Basic static load rating
Co
Static equivalent radial load coefficient
Po
Table 4 Static safety coefficient
Operating condition of the roller bearing
When high rotation precision is required
When shock and vibration are expected
Under normal operating condition
●Formula (10)
Po
=
Fr
max
+
Symbols of Formula (10)
Maximum radial load
Frmax
Maximum axial load
Famax
Maximum load moment load
Mmax
Pitch circle diameter of a roller
dp
Chapter 2 Installing of Motor
90
C
( ×
)
3
θ
fw
•
Pc
hour
cpm
N(kgf)
N(kgf)
Angl
e
2
M
max
+
0
.
44
Fa
max
dp
N(kgf)
N(kgf)
Nm(kgfm)
m
Figure 2 Oscillating movement
See Table 1.
See Formula (7).
See Table 3.
See Figure 2.
See Table 1.
N(kgf)
See Formula (10).
N(kgf)
fs
≧3
≧2
≧1.5
See "How to obtain the maximum load moment
load"
See Figure 1 and Table 1.
6
Oscillating angle
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