Product Overview
The SEW S Series is a premier right-angle drive solution designed for applications requiring high ratios and extremely low noise levels. By integrating an initial helical gear stage with a high-quality worm gear stage, the S Series achieves a much higher efficiency rating than conventional, single-stage worm reducers.
Paired with the DRN series IE3 Premium Efficiency motor, this speed reducer is optimized for sustainable, long-term operation. The right-angle configuration allows for a compact mechanical footprint, making it the go-to choice for machine builders who need to fit high-torque drive systems into confined spatial envelopes without sacrificing energy performance.
Technical Data Table
| Feature | Specification |
| Power Range | 0.12 kW to 22 kW |
| Efficiency Class | IE3 (IEC 60034-30-1) |
| Housing Design | Monoblock high-strength cast iron |
| Input Speed | 1400 - 1750 RPM (Typical 4-pole) |
| Standard Backlash | Low backlash design available |
| Lubrication | Synthetic (CLP PG) or Mineral oil options |
| Thermal Protection | TF (PTC Thermistor) or TH (Bimetal switch) |
Product Characteristics
Attenuation of Shock Loads: The sliding action of the worm gear stage naturally dampens vibrations and absorbs shock loads, protecting the motor and the driven machine from sudden mechanical stress.
Exceptional Low-Noise Signature: The combination of helical and worm gearing creates a smooth rolling-sliding contact that is significantly quieter than bevel or parallel shaft units, ideal for indoor facility operations.
Modular Versatility: The S Series is part of a universal modular system, allowing it to be combined with brakes, encoders, and different motor frames (DRN, DR2S) without requiring custom adapters.
Selection Guide & Calculation Factors
When selecting an S Series reducer, the Service Factor (fB) is critical. Because helical-worm units generate heat through friction, it is essential to consider the ambient temperature and the duration of the duty cycle. For continuous 24/7 operation or high-start frequency applications, we recommend selecting a unit with a service factor of 1.4 or higher. Additionally, choosing synthetic oil (Polyglycol) can increase the overall efficiency of the worm stage by up to 10% compared to standard mineral lubricants.
Related Models & Configurations
| Gearbox + Motor Model | Mounting Config | Shaft Type | Motor Efficiency | |
| S47-DRN80M4 | Foot-Mounted | Solid Shaft | IE3 | |
| SF57-DRN90L4 | B5 Flange | Hollow Shaft | IE3 | |
| SA67-DRN100L4 | Torque Arm | Hollow Shaft | IE3 | |
| SH77-DRN132S4 | Flange-Mounted | Shrink Disc | IE3 | |
| S37-DR2S71M4 | Foot-Mounted | Solid Shaft | IE1/IE2 |
Application Industries
Logistics & Warehousing: Sorting systems, cross-belt conveyors, and incline belts.
Theater & Stage Tech: Quiet hoisting and scenery movement where low decibel levels are mandatory.
Food & Packaging: Bottling plants, palletizers, and wash-down environment machinery.
Agriculture: Silo unloaders and grain handling equipment requiring high reduction ratios.
FAQ
1. Is the S Series speed reducer self-locking?
While worm gears can exhibit self-locking tendencies at very high ratios, SEW S Series units are generally not considered reliably self-locking due to their high efficiency. For safety-critical applications or holding loads on inclines, a motor brake (e.g., BE series) must be used.
2. Why is an IE3 motor recommended for this reducer?
Worm stages naturally lose some energy to friction. By using an IE3 motor, you offset these losses with high electrical efficiency, ensuring the total drive package meets modern "Green" energy regulations and reduces heat generation.
3. Can I mount the S Series in any direction?
Yes, but the mounting position (M1-M6) must be defined. The position determines the oil volume, the placement of the breather valve, and which bearings require specialized lubrication to prevent dry-running.
4. How often should I check the oil in a helical-worm unit?
Oil levels should be checked every 3,000 to 5,000 operating hours. For units using synthetic oil, a full oil change is typically required every 20,000 hours, depending on the operating temperature.
5. What is the difference between S, SA, and SF models?
S: Foot-mounted with solid shaft.
SA: Foot-mounted or torque arm with hollow shaft.
SF: Flange-mounted (B5) with hollow shaft.
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