Product Introduction
The FH57 represents a specialized evolution of the SEW F-series. While most gearboxes rely on a mechanical key to transfer power-which can wear out or develop "play" over time-the FH57 uses a shrink disc. This external clamping mechanism compresses the hollow shaft onto the machine's solid shaft, creating a high-strength, interference fit.
Paired with the IE3 premium efficiency DRN motor, the FH57-DRN combination significantly reduces energy overhead. Its slim, "flat" design allows it to be tucked into machine frames where space is tight, offering a cleaner, more streamlined aesthetic and functional layout for modern industrial lines.
Technical Specifications (FH57-DRN series)
| Feature | Specification |
| Power Range | 0.75 kW to 7.5 kW (standard configurations) |
| Efficiency Standard | IE3 (Premium Efficiency) |
| Output Shaft Diameter | 35 mm / 40 mm (clamping diameter) |
| Housing Material | High-strength Grey Cast Iron |
| Ambient Temperature | -20 degrees Celsius to +40 degrees Celsius (Standard) |
| Lubrication | CLP 220 Mineral (Optional Synthetic for low temp) |
| Enclosure Rating | IP55 / IP65 |
Unique Features of the FH57
- Fretting Corrosion Prevention: Because the shrink disc creates a liquid-tight seal between the hollow shaft and the machine shaft, moisture cannot enter the connection. This prevents "rust-freezing," allowing for easy removal even after decades of service.
- Reverse Load Excellence: The keyless friction connection eliminates the "backlash" common in keyed shafts during frequent motor reversals, protecting the internal gear teeth from shock loads.
- Weight-Optimized Slim Design: The FH57 housing is engineered to maximize torque-to-weight ratio, ensuring that it doesn't add unnecessary structural load to the machine shaft it is mounted upon.
Component Structure: The Shrink Disc Advantage
The FH57's output end consists of a three-piece clamping system. Located on the outside of the hollow shaft, the shrink disc consists of two tapered rings and a set of locking bolts.
- Safety First: The disc is covered by a guard to prevent contact with rotating parts.
- Balanced Load: The clamping force is distributed 360 degrees around the shaft, reducing localized stress concentrations that often lead to shaft fatigue in keyed systems.
- Ease of Alignment: Operators can easily adjust the axial position of the gearmotor before tightening the bolts, a task that is significantly more difficult with fixed keyway positions.
Related Models Comparison Table
| Model | Connection Type | Mounting Style | Max Torque |
| F57 | Solid Shaft / Key | Foot Mount | 600 Nm |
| FAF57 | Hollow Shaft / Key | B5 Flange | 600 Nm |
| FH57 | Hollow Shaft / Shrink Disc | Foot/Shaft Mount | 600 Nm |
| FHF57 | Hollow Shaft / Shrink Disc | B5 Flange | 600 Nm |
Core Industrial Applications
- Material Handling: Precision sortation conveyors where frequent start-stops occur.
- Beverage Industry: Capping and labeling machines requiring synchronized movement.
- Textile Machinery: Driving rollers where a smooth, keyless surface prevents mechanical imbalance.
- Packaging: High-speed wrapping machines where maintenance downtime must be minimized.
FAQ
Q: Does the shrink disc require special tools for installation?
A: No special tools are required other than a standard torque wrench. It is critical to tighten the bolts to the specific Newton-meter value stamped on the shrink disc to ensure a secure fit.
Q: Can I use a FH57 gearbox with an existing keyed shaft?
A: It is highly recommended to use a smooth, keyless shaft for the best results. If your shaft has a keyway, it must be filled with a filler material to prevent the hollow shaft from deforming into the gap when the shrink disc is tightened.
Q: Is the shrink disc reusable?
A: Yes. As long as the tapered surfaces are cleaned and lightly lubricated (per SEW guidelines) and the bolts are not over-stretched, the shrink disc can be used for multiple installations.
Q: Why choose FH (Foot) over FHF (Flange)?
A: Choose the FH57 if you intend to use a torque arm for shaft-mounting. Choose the FHF57 if you need to bolt the gearbox directly to the side of a machine wall or frame via a B5 flange.
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