The RRF Series Foot Mounted Big Ratio Combined Helical Gearbox is designed for heavy-duty industrial applications requiring extremely high reduction ratios, high torque output, and stable low-speed operation. Featuring a multi-stage combined gear design and optimized helical gear meshing structure, it delivers exceptional load capacity, smooth operation, and high transmission reliability. The gearbox is widely used in large-scale conveying, mining, and material processing systems where very low output speed and very high torque are required. Output torque ranges up to 50,000 Nm, while input power capacities range from 0.18 kW to 200 kW depending on configuration.
| Item | Specification |
| Gear Type | Multi-Stage Helical Gear |
| Mounting Type | Foot Mounted |
| Input Type | IEC Motor / Solid Shaft |
| Output Shaft Type | Solid Shaft |
| Housing Material | High-Strength Cast Iron |
| Gear Material | Alloy Steel |
| Gear Surface Hardness | HRC58–62 |
| Transmission Efficiency | Up to 94% |
| Ratio Range | 10 – 2000+ |
| Output Torque | 500 – 50,000 Nm |
| Motor Power | 0.18 – 200 kW |
| Lubrication | Forced / Oil Bath Lubrication |
| Protection Class | IP55 (Optional IP65) |
| Ambient Temperature | -20°C to +40°C |
| Model | Ratio Range | Output Torque (Nm) | Motor Power (kW) |
| RRF67 | 10 – 120 | 800 | 0.18 – 7.5 |
| RRF77 | 15 – 180 | 1,500 | 0.37 – 15 |
| RRF87 | 20 – 250 | 3,000 | 0.75 – 37 |
| RRF97 | 30 – 400 | 6,000 | 1.5 – 75 |
| RRF107 | 50 – 800 | 12,000 | 3 – 110 |
| RRF137 | 80 – 1200 | 25,000 | 5.5 – 160 |
| RRF147 | 120 – 2000+ | 50,000 | 7.5 – 200 |
