Rossi G Series Parallel & Bevel-Helical Industrial Gearboxes
The Rossi G Series Industrial Gearbox Platform (featured model: MR 3IV 160 UO2A 11 kW 1:31.5 Ratio) is Rossi's heavy-duty industrial speed reducer series, engineered for high reliability, maximum fatigue strength, and extreme thermal dissipation in mining conveyors, cranes, bucket elevators, agitators, paper mills, and steel processing equipment. Constructed around Rossi's signature **single-piece monolithic cast-iron housing** (up to size 360) and split-casing design for multi-megawatt sizes, G Series gearboxes eliminate housing deformation and joint oil leaks under extreme shock loads. Featuring carburized, hardened, and precision-ground helical and spiral bevel gear sets, these drives achieve high dynamic transmission efficiency and silent operation. Available in **Parallel Shaft (2, 3, and 4-stage helical: 2I, 3I, 4I series)** and **Right-Angle Shaft (2, 3, and 4-stage bevel-helical: CI, 2IV, 3IV series)** configurations across 22 frame sizes (Size 40 to Size 631), covering output torque ratings up to **670,000 Nm** and reduction ratios from 2:1 to 1,600:1. WE DRIVE HONGKONG LIMITED supplies 100% original Rossi G Series gearmotors, industrial gear units, and exact technical replacement support across global processing plants.
Technical Specifications
| Featured Model | MR 3IV 160 UO2A - 38x300 - 31.5 (Size 160, 11 kW 4-Pole Motor, 3-Stage Bevel-Helical, 1:31.5 Ratio, Universal Monolithic Housing) |
|---|---|
| Brand / Manufacturer | Rossi S.p.A. (Moog Group) |
| Product Series | G Series Heavy Industrial Parallel Shaft (2I, 3I, 4I) & Right-Angle Bevel-Helical (CI, 2IV, 3IV) Reducers & Gearmotors |
| Frame Sizes Covered | Size 40, 50, 63, 80, 100, 125, 140, 160, 180, 200, 225, 250, 280, 320, 360, 400, 450, 500, 560, 631 |
| Output Torque Capacity | 1,200 Nm to 670,000 Nm (10,600 lb-in to 5,930,000 lb-in Continuous Output Torque) |
| Reduction Ratio Range | Parallel Shaft: 2:1 to 500:1; Right-Angle Bevel-Helical: 3.15:1 to 1,600:1 |
| Housing Architecture | Rigid Single-Piece Monolithic Cast Iron Housing with Universal Mounting Surfaces & High Thermal Dissipation Fins |
| Shaft & Mounting Options | Keyed Hollow Shaft, Hollow Shaft with Shrink Disc, Solid Single/Double Output Shaft, Torque Arm, Internal Backstop Ready |
Documentation & Resources
Rossi G Series Frame Size, Torque & Ratio Selection Matrix
Complete selection matrix for Rossi G Series parallel and bevel-helical industrial gearboxes. Review frame sizes, maximum output torques, gearing configurations, standard ratios, and model codes:
| Rossi Frame Size | Gearing Configuration | Max Output Torque (Nm) | Gear Ratio Range (i) | Rossi Model Code Example | Output Shaft Style |
|---|---|---|---|---|---|
| Size 80 / 100 | Parallel / Bevel-Helical | 3,200 Nm | 2:1 - 500:1 | MR 2I 100 UP1A - 16 | Hollow / Solid Output |
| Size 125 / 140 | Parallel / Bevel-Helical | 8,500 Nm | 2:1 - 500:1 | MR 3IV 125 UO2A - 25 | Hollow / Solid Output |
| Size 160 / 180 | Parallel / Bevel-Helical | 18,000 Nm | 2:1 - 500:1 | MR 3IV 160 UO2A - 31.5 | Hollow / Shrink Disc |
| Size 200 / 225 | Parallel / Bevel-Helical | 38,000 Nm | 2:1 - 500:1 | R 2I 200 UP1A - 14 | Hollow / Shrink Disc |
| Size 250 / 280 | Parallel / Bevel-Helical | 75,000 Nm | 2:1 - 500:1 | R 3IV 250 UP1A - 40 | Heavy Duty Solid/Hollow |
| Size 320 - 631 | Parallel / Bevel-Helical | 130,000 - 670,000 Nm | 2:1 - 1,600:1 | R 3IV 360 UP1A - 50 | Heavy Duty Mining Shaft |
Standard Heavy Industrial Gearbox to Rossi G Series Upgrade Guide
Direct replacement guide for upgrading split-housing industrial gearboxes to Rossi G Series monolithic cast-iron units:
| Conventional Heavy Industrial Gearbox | Common Failure Modes | Current Rossi G Series Equivalent | Key Performance & Monolithic Advantages |
|---|---|---|---|
| Split-Housing Parallel Shaft Gearbox | Casing seam oil leaks under peak torsional flex and heavy startup shocks | Rossi MR 2I 125 / MR 2I 140 100% Monolithic Upgrade | Single-piece monolithic cast-iron housing eliminates joint flex and prevents oil leaks. |
| Standard Bevel-Helical Conveyor Drive | Overheating during high ambient summer operation on mining conveyors | Rossi MR 3IV 160 / MR 3IV 200 High Thermal Capacity | Optimized finned housing and axial fan option increase thermal rating substantially. |
| Standard Shaft-Mounted Heavy Reducer | Keyway wallowing and shaft fretting locks under high dynamic torque | Rossi R 3IV 250 with Shrink Disc Keyless Shrink Disc | Keyless shrink disc output hub provides 100% rigid shaft mounting and easy removal. |
Expert Technical Sourcing & Industrial Drive System Integration Notes
When replacing older heavy industrial gearboxes or retrofitting severe processing lines, switching to Rossi G Series gear units delivers immediate operational benefits: complete elimination of split-casing oil leaks via monolithic cast-iron construction, high dynamic transmission efficiency, high resistance to peak overload shocks, silent ground helical gearing, and universal mounting flexibility. Simply provide us with your existing Rossi nameplate designation or complete specification code (e.g., MR 3IV 160 UO2A - 38x300 - 31.5 or R 2I 200 UP1A - 14), and our technical engineering team will deliver a 100% compliant replacement specification and proposal.
Core Benchmark Model Standard Configurations
- MR 2I 80 UP1A (Parallel Helical 3.0 kW)
- MR 2I 100 UP1A (Parallel Helical 5.5 kW)
- MR 2I 125 UP1A (Parallel Helical 11.0 kW)
- MR 2I 140 UP1A (Parallel Helical 15.0 kW)
- MR 3IV 125 UO2A (Bevel Helical 7.5 kW)
- MR 3IV 160 UO2A (Bevel Helical 11.0 kW)
- MR 3IV 200 UO2A (Bevel Helical 22.0 kW)
- R 2I 200 UP1A (Heavy Parallel Reducer)
- R 3IV 250 UP1A (Heavy Bevel Reducer)
- R 3IV 320 UP1A (Heavy Bevel Reducer)
- Rossi Size 125 Bevel Helical Gearbox
- Rossi Size 160 Bevel Helical Gearbox
- Rossi Size 200 Bevel Helical Gearbox
- Rossi Size 250 Bevel Helical Gearbox
- Rossi G Series Monolithic Heavy Iron
- Rossi G Series Hollow Shaft Shrink Disc
- Rossi G Series Mechanical Backstop
- Rossi G Series Axial Cooling Fan
- Rossi Heavy Duty Conveyor Gearbox
- Rossi Heavy Duty Mining Drive Reducer
