Product Introduction
The SEW-EURODRIVE SF47 series is specifically engineered for applications where the gear unit must be bolted directly to the machine wall or frame. The B5 flange design provides a rigid, high-precision connection, ensuring perfect alignment between the gearbox and the driven component.
Unlike standard worm gearboxes, the SF47 features a helical input stage. This design significantly improves the mechanical efficiency of the unit, allowing for smaller motor sizes to be used for the same output torque. With the integration of the IE3 DRN motor series, the SF47 is an ideal "drop-in" replacement for older, less efficient worm drives in automated production lines.
Technical Data Table
| Parameter | Specification |
| Power Range | 0.25 kW to 1.5 kW (Typical) |
| Efficiency Class | IE3 Premium Efficiency |
| Shaft Diameter | 25 mm (Standard Solid Shaft) |
| Flange Diameter | 160 mm / 200 mm (Standard B5) |
| Housing Material | Die-cast aluminum or grey cast iron |
| Protection Class | IP55 (Standard) / IP66 (Optional) |
| Ambient Temp | -20°C to +40°C |
Unique Performance Features
Asymmetric Torque Distribution: The SF47 is optimized for applications requiring high starting torque in a lightweight package, making it exceptionally effective for small-scale lifting and indexing.
Self-Damping Transmission: The inherent sliding action of the worm gear stage naturally absorbs minor mechanical shocks, preventing vibration feedback from reaching the motor bearings.
Lubricant Longevity: Optimized internal geometry reduces oil churning, which keeps the lubricant temperature lower and extends the service interval compared to conventional right-angle drives.
Components & Build Quality
The SF47 utilizes a specialized bronze alloy for the worm wheel and case-hardened steel for the worm shaft. This material pairing is designed for low friction and high wear resistance. The helical gears are precision-ground to reduce noise levels, making the SF47 one of the quietest units in its torque class. The flange face is machined to tight tolerances, ensuring that the unit can be mounted without the need for additional shims or alignment tools.
Related Models & Configurations
| Full System Model | Mounting Type | Motor Frame | Shaft Style | Additional Features |
| SF47-DRN80M4 | B5 Flange | 80M | Solid Shaft | Standard IE3 |
| SAF47-DRN90S4 | B14 Flange | 90S | Hollow Shaft | Space-Saver |
| SF47-DR2S71MS4 | B5 Flange | 71MS | Solid Shaft | Standard Efficiency |
| SF47-DRN90L4/BE2 | B5 Flange | 90L | Solid Shaft | 20Nm Spring Brake |
Primary Industry Applications
Food Packaging: Ideal for driving small conveyors and capping machines where washdown protection is required.
Logistics: Perfect for sorting gates and small-scale belt diversions.
Textiles: Used in tensioning drives and winding machinery due to its smooth torque delivery.
Medical Equipment: Suitable for height-adjustment systems where quiet operation is paramount.
FAQ
1. What is the difference between SF and SAF models?
The "SF" designation indicates a flange-mounted unit with a solid output shaft. The "SAF" version features a flange-mounted housing but with a hollow output shaft for direct machine mounting.
2. Does the SF47 support high-speed input?
Yes, the SF47 is designed to work with standard 4-pole motors (approx. 1450 RPM). If higher input speeds are required, please consult the thermal limit charts in the SEW catalog.
3. Is this gearbox self-locking?
In high-ratio configurations, the SF47 may exhibit partial self-locking characteristics. However, for safety-critical holding applications, we always recommend ordering the unit with a motor brake (e.g., BE series).
4. Can I use mineral oil in the SF47?
While mineral oil is acceptable for some configurations, we highly recommend synthetic oil (CLP HC) for helical-worm units. Synthetic lubricants significantly improve the efficiency and lifespan of the worm gear set.
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