Application-specific service factor – FS min and peak loads
The application-specific service factor takes into account all continuously occurring dynamic torques that are applied to the gear unit from outside beyond nominal operation based on the application factor according to DIN 3990/ISO 6336.
These torques depend, among other things, on the characteristics of the driving and driven machine, the size and distribution of the inertia, the spring stiffness in the input and output train (e.g. shafts and couplings), protective measures such as safety couplings and the respective operating conditions. They apply to gear units with even power demand.
Beyond this, an additional check for peak loads and an increased motor start-up ratio is only required if the following requirements are not met. This is necessary, for example, for intermittent duty or operation with extreme, repeated impact loads.
In general, the gear units can be loaded with up to twice the nominal gear unit torque for a limited number of load variations.
In this specific case, we recommend contacting SEW-EURODRIVE.
The application-specific service factor FS min takes account of the typical load behavior with regard to the driven machine.
Recommended values in relation to
- Area of application
- Type of driven machine
- Operating hours/day
are listed in the table below.
The following tables apply only to gear units driven by electric motors. For other types of driving motors, the following correction values apply:
- Combustion engines with 4 or more cylinders:
- FS min (selection table) + 0.5
- Combustion engines with 1 to 3 cylinders:
- FS min (selection table) + 0.5
In the event of deviations from the typical load behavior, consult SEW‑EURODRIVE.
Area of application | Type of application (driven machine) | Application-specific Operating time/day > 10 h |
|---|---|---|
Wastewater treatment | Impeller aerators | 2.00 |
Thickeners | 1.50 | |
Vacuum filters | 1.50 | |
Accumulators | 1.50 | |
Screw pumps | 1.50 | |
Brush aerators | 2.00 | |
Mining | Crushers | 3.00 |
Shakers and screens | 2.00 | |
Swing gears | 1.80 | |
Bucket-wheel excavators | 1) | |
Energy | Frequency inverters | 2.00 |
Water wheels (rotating slowly) | 1) | |
Water turbines | 1) | |
Conveyor systems | Bucket elevators | 1.50 |
Belt conveyors ≤ 100 kW | 1.40 | |
Belt conveyors > 100 kW | 1.50 | |
Apron feeders | 1.50 | |
Feeding screws | 1.50 | |
Shakers, screens | 2.00 | |
Escalators | 1.50 | |
Passenger elevators | 1) | |
Rubber and plastics industry | Extruders (plastic) | 1.60 |
Extruders (rubber) | 1.80 | |
Rubber rollers (2 consecutive) | 2.00 | |
Rubber rollers (3 consecutive) | 1.75 | |
Heated rollers | 1.75 | |
Calenders | 1.65 | |
Mills | 2.00 | |
Mixing rollers | 1) | |
Slab rollers | 2.00 | |
Refining rollers | 2.00 | |
Tire machines | 1) | |
Wood industry | Wood industry | 1) |
Crane systems | Cranes and hoists | 1) |
Food industry | Crushers and mills | 1.75 |
Beet cutters | 1.50 | |
Drying drums | 1.50 | |
Metal production and processing | Winders | 1.75 |
Cutting rollers | 2.00 | |
Table conveyors, single drive | 1) | |
Table conveyors, group drive | 1) | |
Table conveyors, running in and out | 1) | |
Wire drawing machines | 1.75 | |
Rollers | 1) | |
Mills and drums | Cooling and drying drums | 1.60 |
Rotary kilns | 2.00 | |
Ball mills | 2.00 | |
Coal mills | 1.75 | |
Agitators and mixers | Agitators for liquids | 1.50 |
Agitators for liquids | 1.65 | |
Agitators for solids | 1.70 | |
Agitators for solids | 1.40 | |
Concrete mixers | 1.50 | |
Paper and pulp industry | Debarking drums and debarkers | – |
Rollers (pick-up, wire drive, and wire suction) | 2.00 | |
Drying cylinders (rolling bearing) | 2.00 | |
Calenders (rolling bearing) | 2.00 | |
Filters (pressure and suction filters) | 2.00 | |
Chippers and shredders | 2.00 | |
Jordan refiners | 1.75 | |
Presses (bark, felt, glue, suction) | 1.75 | |
Reels | 1.75 | |
Pulpers | 1) | |
Washing filters | 1.50 | |
Yankee dryers | 1) | |
Pumps | Centrifugal pumps | 1.45 |
Reciprocating pumps (single-cylinder) | 1.80 | |
Reciprocating pumps (multi-cylinder) | 1.50 | |
Screw pumps | 1.50 | |
Rotary pumps (gear pumps, wing pumps) | 1.25 | |
Cable transport systems | Material ropeways | 1.50 |
Aerial tramways | 1) | |
Surface lifts | 1) | |
Circular cableways | 1) | |
Funiculars | 1) | |
Fans | Heat exchangers | 1.50 |
Dry cooling tower | 2.00 | |
Wet cooling towers | 2.00 | |
Blowers (axial and radial) | 1.50 | |
Compressors | Reciprocating compressors | 1.90 |
Radial compressors | 1.50 | |
Screw-type compressors | 1.75 |
1) Contact SEW-EURODRIVE
