Product Introduction
The ST77 series is a robust, high-torque right-angle drive engineered for demanding industrial environments where traditional shaft connections often fail or become permanent due to corrosion. This model stands out by utilizing the TorqLOC® hollow shaft mounting system, a patented non-positive connection that simplifies installation and removal while allowing for the use of standard, non-machined customer shafts.
Paired with a premium efficiency DRN motor, the ST77 provides a high-ratio power transmission solution in a compact housing. Its helical-worm configuration offers a significant mechanical advantage, delivering high output torque with the characteristic quiet operation of a worm gear set, making it indispensable for large-scale conveyor and mixing systems.
Technical Data Table
| Feature | Specification |
| Motor Power | 1.1 kW to 7.5 kW (DRN Frame Dependent) |
| Connection Technology | TorqLOC® (Keyless friction connection) |
| Hollow Shaft Diameter | 40 mm / 45 mm / 50 mm (Options available) |
| Efficiency Class | IE3 Premium Efficiency |
| Casing Design | Robust Ribbed Cast Iron for Heat Dissipation |
| Mounting Orientation | M1 to M6 (Universal options) |
| Sealing System | Standard Dual-Lip (FKM Premium Optional) |
Product Characteristics
TorqLOC® Installation Advantage: The ST77 eliminates the need for expensive shaft machining (h6 tolerances) and keyways. It can be mounted on drawn, unmachined shafts, significantly reducing material costs and prep time.
Superior Torque Threshold: As a "77" frame size, this unit offers a substantial jump in torque capacity (up to 1450 Nm) compared to the 67 series, specifically designed for high-inertia start-ups.
Corrosion-Resistant Separation: Because the TorqLOC® system prevents fretting corrosion between the gearbox and the machine shaft, the ST77 can be disassembled easily even after years of heavy-duty use in harsh environments.
Installation Flexibility & Asset Protection
The ST77 with TorqLOC® serves as more than just a gearbox; it is a mechanical insurance policy. By utilizing a tapered bushing system, the gearmotor is decoupled from the direct stresses of shaft misalignments. Furthermore, the T-design (Torque arm) allows the unit to "breathe" during high-torque fluctuations, protecting the internal gear teeth from shock-load damage. This setup is particularly effective in heavy-duty logistics where load weights vary significantly throughout a shift.
Related Models & Configurations
| Full Gearmotor Model | Connection Method | Motor Type | Output RPM (50Hz) | |
| ST77-DRN100LS4 | TorqLOC® | IE3 (2.2 kW) | 18 - 120 RPM | |
| ST77-DRN132S4 | TorqLOC® | IE3 (5.5 kW) | 25 - 145 RPM | |
| SAF77-DRN112M4 | B5 Flange / Keyed | IE3 (4.0 kW) | 20 - 130 RPM | |
| ST77-DRN90L4/BE | TorqLOC® + Brake | IE3 (1.5 kW) | 12 - 95 RPM |
Application Industries
Bulk Material Handling: Heavy-duty belt feeders and bucket elevators.
Heavy Logistics: High-capacity pallet conveyor systems and automated storage/retrieval systems (ASRS).
Industrial Mixing: Driving large-scale chemical or food agitators where right-angle space is limited.
Mining & Quarrying: Ancillary equipment drives requiring high ratios and shock resistance.
FAQ
1. What makes TorqLOC® better than a standard shrink disc?
While both are keyless, TorqLOC® uses a patented bushing system that allows for much larger tolerances on the customer shaft (up to h11), meaning you don't need expensive precision-ground shafts to achieve a secure fit.
2. Can the ST77 handle reversing loads?
Yes. The keyless friction connection of the TorqLOC® system is ideal for reversing applications because it eliminates the "clunking" or mechanical wear that occurs in keyed shafts during direction changes.
3. Is the helical-worm gear set in the ST77 efficient?
Yes, the helical-worm combination is significantly more efficient than a standard single-stage worm gearbox. The helical stage does most of the heavy lifting, allowing the worm stage to operate at optimized sliding speeds.
4. Does the ST77 require special tools for installation?
No. Installation only requires standard wrenches and a torque wrench to ensure the TorqLOC® bolts reach the factory-specified tension.
5. How do I choose the right bushing size for my ST77?
The ST77 hollow shaft can be fitted with various interchangeable bushings to match your existing machine shaft diameter. Please specify your shaft size when ordering to ensure the correct kit is included.
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