Product Introduction
The SEW-EURODRIVE SAF47-DRN90L4 is a high-efficiency right-angle drive package designed for precision and space-saving installation. By combining the SAF47 gearbox-which features a B5 output flange and a hollow shaft-with the 1.5kW DRN90L4 IE3 premium efficiency motor, this unit offers a streamlined solution for modern machinery. The hollow shaft design allows for direct mounting onto the machine's drive shaft, eliminating the need for expensive couplings or base plates. This specific configuration is highly sought after for automated systems where compact dimensions and high energy efficiency are non-negotiable.
Technical Specifications
| Specification | Technical Data |
| Gearmotor Assembly | SAF47 DRN90L4 |
| Rated Motor Power | 1.5 kW (2.0 HP) |
| Efficiency Class | IE3 (Premium Efficiency) |
| Output Shaft Bore | 30 mm (Standard Hollow) |
| Flange Diameter | 160 mm (B5 Standard) |
| Duty Cycle | S1 (Continuous) |
| Lubrication Type | Mineral Oil (Standard) / Synthetic (Optional) |
| Protection Class | IP55 Standard |
Distinctive Features of the SAF47 Series
Integrated B5 Flange Geometry: The SAF47 housing is cast with an integral flange, providing superior structural rigidity for face-mounted applications compared to bolt-on flange adapters.
Low-Inertia Helical Input: The primary helical gear stage is optimized to reduce mass moment of inertia, allowing the 1.5kW motor to perform more dynamic start-stop cycles with less energy waste.
Friction-Optimized Worm Pairing: The SAF47 uses a specialized tooth profile that maintains a consistent lubricant wedge, ensuring the sliding action of the worm gear remains efficient even during high-torque startups.
Installation Flexibility & Shaft Mounting
The SAF47 is specifically engineered for "Plug-and-Play" mechanical integration. Because the unit is supported directly by the driven shaft and secured by the B5 flange, it eliminates alignment errors that often lead to premature bearing failure in solid-shaft setups. For applications prone to vibration, the SAF47 can be configured with a torque arm instead of a rigid flange mount, allowing for slight mechanical oscillations without stressing the gearbox internal gears. This flexibility makes it a favorite for retrofitting older belt-driven systems.
Related Models & Technical Matrix
| Full Unit Model | Mounting Style | Motor Power/Efficiency | Gear Ratio (i) | Output Speed (RPM) |
| SAF47 DRN80M4 | B5 Flange / Hollow | 0.75 kW IE3 | 92.00 | 15 |
| SA47 DRN90L4 | Foot Mount / Hollow | 1.5 kW IE3 | 45.20 | 32 |
| SHF47 DRN100LS4 | B5 Flange / Shrink Disk | 2.2 kW IE3 | 28.50 | 51 |
| SAF47 DR2S90L4 | B5 Flange / Hollow | 1.5 kW IE2 | 115.3 | 12 |
Primary Industry Applications
Conveyor Technology: Driving belt and roller conveyors in logistics centers where right-angle space is limited.
Packaging Machinery: Ideal for capping, labeling, and filling stations requiring smooth, quiet operation.
Chemical Dosing: Used in small-scale mixers and agitators where the B5 flange provides a stable mounting interface to the tank.
FAQ
1. Can the SAF47 be used without a torque arm if flange-mounted?
Yes. When the SAF47 is bolted via its B5 flange directly to the machine frame, the flange acts as the torque support. Ensure the mounting surface is flat and capable of handling the 408 Nm peak torque.
2. What is the advantage of the 1.5kW DRN90L4 over smaller motors?
The DRN90L4 provides the necessary torque reserve for 1.5kW applications while meeting IE3 efficiency standards. This ensures the motor runs cooler, extending the life of the SAF47's oil seals and internal lubricant.
3. Is a hollow shaft with a keyway standard?
Yes, the "SA" in SAF47 denotes a hollow shaft with a keyway. If you require a keyless connection for high-precision or frequent reversing, we recommend the SHF47 with a shrink disk.
4. How often should the oil be changed in the SAF47?
For mineral oil under standard conditions, every 10,000 operating hours or every 2 years is recommended. If using synthetic oil, this interval can be extended up to 20,000 hours.
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