Product Introduction
The SA67R37-DRN100LS4 is a high-efficiency compound helical-worm gearmotor engineered for applications requiring significant speed reduction and space-saving geometry. By combining an SA67 worm stage with an R37 helical primary stage, this unit achieves high ratios while maintaining the quiet operation typical of worm gearing. Paired with a DRN series IE3 premium efficiency motor, it meets global energy standards for sustainable industrial operations.
Product Introduction
The SEW-EURODRIVE SA67R37 series represents a specialized solution for heavy-duty torque requirements in tight footprints. The "R37" prefix indicates a compound gear setup, where an additional helical stage is integrated before the worm stage. This allows for extremely low output speeds without the efficiency drop-off seen in single-stage worm units with high ratios.
Equipped with the DRN100LS4 motor, this system is optimized for continuous duty. The hollow shaft design eliminates the need for couplings and chain drives, allowing for direct mounting onto the machine's drive shaft, which reduces maintenance points and improves overall mechanical safety.
Technical Data Table
| Parameter | Specifications |
| Motor Power | 2.2 kW / 3.0 HP |
| Motor Speed | 1455 RPM (at 50Hz) |
| Efficiency Class | IE3 Premium Efficiency |
| Enclosure Rating | IP55 (Standard) |
| Insulation Class | 155(F) |
| Shaft Diameter | 45 mm (Hollow) |
| Lubrication | Synthetic Oil (CLP HC) |
Exclusive Performance Features
Multi-Stage Torque Amplification: Unlike standard single-worm reducers, the R37 primary stage pre-reduces the speed, allowing the worm stage to operate at a higher efficiency point while delivering massive torque at the output.
Low-Vibration Operation: The worm-helical combination naturally dampens mechanical noise, making it the preferred choice for theater stages, elevators, and food processing environments where acoustic control is vital.
Thermal Optimized Casting: The SA67 housing features reinforced ribbing specifically designed to dissipate heat generated by friction in the worm gears, extending oil life and seal integrity.
Component Architecture & Modularity
The SA67R37 utilizes SEW's signature modular concept. The gearcase is made of high-grade grey cast iron, providing excellent vibration absorption. The worm gear set consists of a case-hardened steel worm shaft and a specialized bronze alloy worm wheel, ensuring a balance between durability and friction reduction. The DRN motor is directly coupled via a high-precision pinion, ensuring no power loss between the electrical and mechanical stages.
Related Models & Configurations
| Model Combination | Gear Type | Mounting Style | Motor Frame | Output Type |
| SA67R37-DRN90L4 | Helical-Worm | Flange Mounted (SAF) | 90L | Hollow Shaft |
| SA67R37-DRN112M4 | Helical-Worm | Foot Mounted | 112M | Hollow Shaft |
| SA67-DRN100LS4 | Single Worm | Torque Arm | 100LS | Hollow Shaft |
| S67R37-DRN100LS4 | Helical-Worm | Foot Mounted | 100LS | Solid Shaft |
Target Industry Applications
Waste Water Treatment: Ideal for slow-moving agitators and thickeners.
Material Handling: Used in heavy-duty belt conveyors requiring high starting torque.
Logistics: Perfect for incline conveyors where the self-locking tendency of worm gears provides an added layer of safety.
Packaging: Suitable for palletizing machines requiring precise, quiet movement.
FAQ
1. Can this gearmotor be used in vertical mounting positions?
Yes, but it requires a specific oil level and breather valve configuration (M2, M4, or M5 positions). Please specify the mounting orientation when ordering to ensure proper lubrication of the top bearings.
2. Is the hollow shaft customizable?
The standard bore is 45mm, but shrink disc versions (SAH67) or different bore diameters are available through the SEW modular system to fit your specific machine shaft.
3. What are the maintenance requirements for the SA67R37?
Since it uses a worm gear stage, we recommend using synthetic oil (like Mobil SHC). Oil change intervals are significantly longer than mineral oil, typically every 10,000 to 15,000 operating hours depending on ambient temperature.
4. Does the DRN100LS4 motor support variable frequency drive (VFD) operation?
Absolutely. The DRN series is designed to work seamlessly with frequency inverters (AC Drives) for speed control, provided the thermal limits of the motor are monitored at very low speeds.
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