Rossi E Series Coaxial Helical Gearmotors & Speed Reducers
The Rossi E Series Coaxial Helical Gearmotor Platform (featured model: MR E 80 UO2A 3.0 kW 1:14.5 Ratio) is Rossi's flagship inline drive platform, engineered specifically for high power density, quiet performance, and structural rigidity in heavy industrial conveyors, mixers, pumps, packaging machinery, and material handling systems. Built around Rossi's signature **monolithic (single-piece) cast-iron housing**, E Series inline gearboxes eliminate split-housing joints and gasket distortion, achieving zero oil leakage, high resistance to peak shock loads, and high radial and axial overhung load support. Featuring carburized, hardened, and precision-ground helical gear sets, these units achieve dynamic transmission efficiency exceeding **96% per reduction stage**. Covering continuous torque output ratings from 100 Nm up to 10,000 Nm across 12 frame sizes (Size 32 to Size 180) and gear reduction ratios from 2.24:1 to 6,300:1 (in multi-stage and combined unit configurations). WE DRIVE HONGKONG LIMITED supplies 100% original Rossi E Series gearmotors, replacement units, and exact technical model code decoding across global industrial plants.
Technical Specifications
| Featured Model | MR E 80 UO2A - 28x250 - 14.5 (Size 80, 3.0 kW 4-Pole 230/400V Motor, 1:14.5 Gear Ratio, Universal Monolithic Housing, Foot/Flange Mount) |
|---|---|
| Brand / Manufacturer | Rossi S.p.A. (Moog Group) |
| Product Series | E Series Monolithic Coaxial Helical Gearmotors (MR E) & Speed Reducers (R E) |
| Frame Sizes Covered | Size 32, 40, 50, 63, 64, 80, 81, 100, 125, 126, 160, 180 (Monolithic Cast Iron Construction) |
| Output Torque Capacity | 100 Nm to 10,000 Nm (885 lb-in to 88,500 lb-in Continuous Output Torque) |
| Reduction Ratio Range | 2-Stage / 3-Stage Inline: 2.24:1 to 280:1; Combined Multi-Stage Units up to 6,300:1 |
| Housing Architecture | Rigid Single-Piece Monolithic Cast Iron Housing with Integral Feet & B5/B14 Output Flange Options |
| Shaft & Motor Coupling | Solid Output Shaft Standard, IEC Normalized Motor Coupling (B5/B14), Integrated IE3 Premium Efficiency AC Motor |
Documentation & Resources
Rossi E Series Frame Size, Power & Torque Selection Matrix
Complete selection matrix for Rossi E Series coaxial inline helical gearmotors. Review frame sizes, typical motor power ratings, maximum allowable torque outputs, standard ratios, and model codes:
| Rossi Frame Size | Motor Power Range | Max Output Torque (Nm) | Standard Ratio Examples | Rossi Model Code Example | Mounting Style |
|---|---|---|---|---|---|
| Size 32 / 40 | 0.12 kW - 0.75 kW | 200 Nm | 3.55, 5.6, 9, 14, 22.4, 35.5, 56 | MR E 40 UO3A - 14x138 - 14 | Foot B3 / Flange B5 |
| Size 50 / 63 | 0.75 kW - 2.2 kW | 630 Nm | 4, 6.3, 10, 16, 25, 40, 63, 100 | MR E 63 UO2A - 24x200 - 16 | Foot B3 / Flange B5 |
| Size 80 / 81 | 2.2 kW - 5.5 kW | 1,600 Nm | 4.5, 7.1, 11.2, 18, 28, 45, 71 | MR E 80 UO2A - 28x250 - 14.5 | Foot B3 / Flange B5 |
| Size 100 / 125 | 5.5 kW - 15.0 kW | 4,000 Nm | 5, 8, 12.5, 20, 31.5, 50, 80 | MR E 100 UO2A - 38x300 - 20 | Foot B3 / Flange B5 |
| Size 126 / 160 | 11.0 kW - 30.0 kW | 7,100 Nm | 5.6, 9, 14, 22.4, 35.5, 56, 90 | MR E 126 UO2A - 48x350 - 22.4 | Heavy Duty Foot B3 |
| Size 180 | 22.0 kW - 55.0 kW | 10,000 Nm | 6.3, 10, 16, 25, 40, 63, 100 | R E 180 UP1A - 16 | Heavy Cast Iron B3/B5 |
Conventional Split-Case Inline Reducer to Rossi E Series Replacement Guide
Direct replacement guide for upgrading conventional split-casing coaxial helical gearboxes to Rossi E Series monolithic cast-iron units:
| Conventional Inline Helical Reducer | Common Failure Modes | Current Rossi E Series Equivalent | Key Performance & Monolithic Advantages |
|---|---|---|---|
| Standard Split-Case Inline Helical Gearbox | Casing seam oil leaks under heavy thermal expansion and load flex | Rossi MR E 50 / MR E 63 100% Monolithic Upgrade | Single-piece monolithic cast-iron housing eliminates joint gaskets and prevents oil leaks. |
| Standard 3.0 kW Coaxial Conveyor Drive | Gear alignment displacement caused by housing deformation under peak load | Rossi MR E 80 UO2A High Torsional Rigidity | Rigid monolithic structure maintains precise gear meshing alignment under extreme shock load. |
| Standard Inline Reducer on Mixer Shaft | Bearing failure due to excessive overhung radial load on output shaft | Rossi MR E 100 / MR E 125 Heavy Overhung Load Support | Heavy-duty oversized bearings and robust shafting handle extreme radial and axial forces. |
Expert Technical Sourcing & System Integration Notes
When replacing older inline helical gearboxes or retrofitting heavy industrial belt conveyors, agitators, pumps, or packaging lines, switching to Rossi E Series coaxial gearmotors delivers immediate operational advantages: complete elimination of split-housing oil leaks via monolithic cast-iron construction, high dynamic efficiency (>96% per stage), quiet ground helical gearing, universal mounting versatility, and full compliance with IEC motor standards. Simply provide us with your existing Rossi nameplate designation or complete specification code (e.g., MR E 80 UO2A - 28x250 - 14.5 or R E 100 UP1A - 20), and our technical engineering team will deliver a 100% compliant replacement specification and proposal.
Core Benchmark Model Standard Configurations
- MR E 32 UO3A (0.37 kW Inline)
- MR E 40 UO3A (0.55 kW Inline)
- MR E 50 UO3A (0.75 kW Inline)
- MR E 63 UO2A (1.5 kW Inline)
- MR E 80 UO2A (3.0 kW Inline)
- MR E 81 UO2A (4.0 kW Inline)
- MR E 100 UO2A (5.5 kW Inline)
- MR E 125 UO2A (11.0 kW Inline)
- MR E 126 UO2A (15.0 kW Inline)
- R E 50 UP1A (Solid Input Reducer)
- R E 63 UP1A (Solid Input Reducer)
- R E 80 UP1A (Solid Input Reducer)
- Rossi Size 50 Inline Helical Reducer
- Rossi Size 63 Inline Helical Reducer
- Rossi Size 80 Inline Helical Reducer
- Rossi Size 100 Inline Helical Reducer
- Rossi E Series Monolithic Cast Iron
- Rossi E Series B5 Output Flange
- Rossi E Series IEC Motor Adapter
- Rossi High Efficiency Coaxial Reducer
