Over
hung load, which indicates the force occurred on shaft
end when connected by a sprocket, gear,pulley and etc.
may effect seriously to the tooth, bearing and cause
shaft deflection.
When determining the resultant over
hung load the type of transmission elements mounted
on the output shaft end must be considered and "K"
which indicates transmission element factor should be
applied.
As the over hung load influences on the
life of reducer ,serious consideration is required before
selection and installation.
The over hung load exerted
on the motor respectively input or output shafts can
be calculated as follows;
T
O.H.L
= ----- ¡¤ K (Kgf)
r
|
where
|
T=
torque
r=pitch radius of transmission
elements(m )
K=transmission elements
factor |
Transmission Elements Factor(K)
Transmission Elements |
K |
Gear |
1.15 |
Chain
sprocket |
1.40 |
V
pulley |
1.75 |
Flat
belt pulley |
2.50 |
¡ß Load
occurred on outside of shaft |
|
§¤
L = Lo ---------------
§¤l
+ §¤b |
¡ß Load
occurred on inside of shaft |
§¤
L = Lo ---------------
§¤l
- §¤b |
where |
L
=force ofO.H.L.
Lo=nominal
force fo O.H.L. on the catalogue
.§¤=distance
from the center of Ls to the
center of bearing
§¤b=distance from
the center of load occurring point to the
center of Ls
|
The actual O.H.L. is given by the following
formula
T
x K x (§¤ + LS / 2)
O.H.L
= LO ------------------------
r
x 1.07 x LS. |
where
|
T=
Transmission Torque
r=Pitch radius of
transmission elements(m )
K=Transmission
element factor |
¡ß §¤ values per a EG
worm reducer size
reducer
size |
50 |
60 |
70 |
80 |
100 |
120 |
135 |
155 |
175 |
200 |
225 |
250 |
§¤
value |
45 |
52 |
60 |
62 |
80 |
85 |
95 |
112 |
110 |
135 |
150 |
160 |
|