How To Obtain The Radial Load Coefficient (X) And Axial Load Coefficient (Y); How To Obtain The Life - Harmonic Drive CSF-3 Series Manual

2-5 How to obtain the radial load coefficient (X) and axial
load coefficient (Y)
● Formula (5) Table 2
Fa av
+ 2 +
av av
Fr (Fr (Lr R)
Fa av
+ 2 +
av av
Fr (Fr (Lr R)
Symbol of Formula (5)
Average radial load
Frav
Average axial load
Faav
Lr ,La
Offset amount
R
Pitch circle diameter of a roller
dp
2-6

How to obtain the life

Obtain the life of the 4-point contact bearing by Formula (6).
You can obtain the dynamic equivalent radial load (Pc) by Formula (7).
●Formula (6)
10
6
L =
60 × N
av
B 10
Symbols of Formula (6)
Life
L
B-10
Average output rotational speed
Nav
Basic dynamic load rating
C
Dynamic equivalent radial load coefficient
Pc
Load coefficient
fw
Table 3 Load coefficient
Load status
During smooth operation without shock or vibration
During normal operation
During operation with shock and vibration
●Formula (7)
2 ( Fr av
Pc = X • (
Symbols of Formula (7)
Average radial load
Frav
Average axial load
Faav
Pitch circle diameter of a roller
dp
Radial load coefficient
X
Axial load coefficient
Y
Lr,La
Offset amount
R
Chapter 2 Installing of Motor
≤
1.5
+ ⋅
av
Fa La)/dp
>
1.5
+ ⋅
av
Fa La)/dp
―
C
× ( )
3
fw • Pc
( Lr + R ) + Fa av • La )
) +
dp
Ｘ Ｙ
1 0.45
0.67 0.67
See "Average load."
N(kgf)
See "Average load."
N(kgf)
See Figure 1.
m
See Figure 1 and Table 1.
m
See Figure 1 and Table 1.
m
hour
See "How to obtain the average load."
r/min
See Table 1.
N(kgf)
See Formula (7).
N(kgf)
See Table 3.
―
fw
1～1.2
1.2～1.5
1.5～3
Y • Fa
av
See "How to obtain the average load."
N(kgf)
See "How to obtain the average load."
N(kgf)
See Figure 1 and Table 1.
m
See Table 2.
See Table 2.
See Figure 1.
m
See Figure 1 and Table 1.
m
5