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Worm Gear Units
Service Factors for
Crane Installations
When using gear units with alternating loads – as they usually exist in crane installations – a classification according to FEM is recommended. For
this purpose, the factor for driven machine f
of mechanism standard values M
utilization of mechanism T
...T
0
To take into account the load distribution in case of alternating loads within a representative period of time t, the cubic mean factor K is calculated
by:
Here, P
...P
is the operating cycle within the time cycle t
1
n
L
1
T
1
P
1
1.0
T
2
P
2
T
0.4
3
P
3
0.1
t
t
t
1
2
3
0 10
50
Duration of use
Table 1
Ty e of a
Type of appliance
liance
Designation
Assembling cranes
Stocking and reclaiming transporters
Stocking and reclaiming transporters
Workshop cranes
Overhead travelling cranes, pig-breaking cranes,
scrapyard cranes
Bridge cranes for unloading, bridge cranes for
containers, other bridge cranes (with crab and/
or slewing jib crane)
Bridge cranes for unloading, bridge cranes
(with crab and/or slewing jib crane
Drydock cranes, shipyard jib cranes, jib cranes for
dismantling
Dockside cranes (slewing, on gantry, ...)
floating cranes and pontoon derriks
Dockside cranes (slewing, on gantry, ...)
floating cranes and pontoon derriks
Floating cranes and pontoon derricks for very
heavy loads (usually greater than 100 t)
Deck cranes
Deck cranes
Tower cranes for building
Derricks
Railway cranes allowed to run in trains
Automotive cranes
*) Only a few typical cases of use are shown, by way of guidance, in this column.
If the system is driven via an electric or hydraulic motor, a factor for prime mover f
The factors shown on page 14 are empirical values. Prerequisite for their application is that the machinery and equipment mentioned correspond
to generally accepted design- and load specifications. In case of deviations from standard conditions, please refer to us.
For driven machines which are not listed in this table, please refer to us.
12
and the peak torque factor f
1
...M
in table 1 below – depending on the load (state of loading of mechanism L
1
8
).
9
( )
3
P
K =
P
...t
1
L
2
1.0
0.733
0.467
0.2
t
t
t
1
2
3
100
0 16.7 33.3
50
Service classification
Group classification of mechanisms
Particulars concerning
Particulars concerning
nature of use
Grab or magnet
Grab or magnet
a) Hook or spreader duty
Grab or magnet
Grab or magnet
Grab or magnet
CAVEX
can be derived from table 2 on page 14 in accordance with the group
3
( )
P
t
t
3
3
1
n
n
1
•
+ ...
•
t
P
t
.
n
L
3
1.0
t
t
4
1
100
0
50
(*)
Hoisting
M2 - M3
Hook duty
M5 - M6
M7 - M8
M6
M8
M6 - M7
b) Hook duty
M4 - M5
M8
Hook duty
M5 - M6
Hook duty
M6 - M7
M7 - M8
M3 - M4
Hook duty
M4
M5 - M6
M4
M2 - M3
M3 - M4
Hook duty
M3 - M4
= 1 may be provided.
2
...L
) and the duty (classes of
1
4
L
4
1.0
0.4
t
2
0
100
See FEM 1001 Section I
3rd Edition, Table T.2.1.3.5
Type of mechanism
Luffing
Traverse
M1 - M2
M1 - M2
-
M4 - M5
-
M6 - M7
-
M4
-
M6 - M7
M3 - M4
M6 - M7
-
M4 - M5
M3 - M4
M7 - M8
M4 - M5
M4 - M5
M5 - M6
-
M6 - M7
-
M3 - M4
-
M3 - M4
M2
M3 - M4
M4 - M5
M4
M3
M1 - M2
-
M3 - M3
-
M2 - M3
-
0.8
t
t
1
2
90 100
Travel
M2 - M3
M5 - M6
M7 - M8
M5
M7 - M8
M4 - M5
M4 - M5
M4 - M5
M5 - M6
M3 - M4
M4 - M5
-
M3
M3 - M4
M3
-
-
-
K88 DE/EN/FR
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