Rossi S Series Heavy Duty Industrial Gearboxes
The Rossi S Series Industrial Gearbox Platform (featured model: S 2I 200 UO2A 1:25 Ratio) is Rossi's heavy-duty industrial drive series, engineered specifically to handle high continuous output torque, heavy shock loads, and high thermal dissipation in mining conveyors, bucket elevators, mixers, cranes, and heavy processing machinery. Built around Rossi's signature **single-piece monolithic cast-iron housing**, S Series gearboxes eliminate split-casing joints and gasket distortion under load, achieving superior oil sealing and maximum resistance to torsional stress. Featuring carburized, hardened, and precision-ground alloy steel helical and spiral bevel gear sets, these units deliver maximum fatigue strength and quiet power transmission. Available in **Parallel Shaft (2, 3, and 4-stage helical: S 2I, S 3I, S 4I)** and **Right-Angle Shaft (2, 3, and 4-stage bevel-helical: S CI, S 2IV, S 3IV)** configurations across 12 heavy frame sizes (Size 140 to Size 400), covering torque output capacity up to **400,000 Nm** and gear ratios from 2:1 to 1,250:1. WE DRIVE HONGKONG LIMITED supplies 100% original Rossi S Series heavy industrial gear units, forced oil cooling packages, and technical replacement support for global process plants.
Technical Specifications
| Featured Model | S 2I 200 UO2A - 25 (Size 200 Heavy Unit, 2-Stage Parallel Helical, 1:25 Nominal Ratio, Universal Monolithic Housing, Foot Mount) |
|---|---|
| Brand / Manufacturer | Rossi S.p.A. (Moog Group) |
| Product Series | S Series Heavy Duty Parallel Shaft (S 2I, S 3I) & Right-Angle Bevel-Helical (S 2IV, S 3IV) Reducers |
| Frame Sizes Covered | Size 140, 160, 180, 200, 225, 250, 280, 320, 355, 360, 400 (Heavy Duty Monolithic Cast Iron) |
| Output Torque Capacity | 10,000 Nm to 400,000 Nm (88,500 lb-in to 3,540,000 lb-in Continuous Output Torque) |
| Reduction Gear Ratios | Parallel Shaft: 2:1 to 400:1; Right-Angle Bevel-Helical: 3.15:1 to 1,250:1 |
| Housing Architecture | Rigid Single-Piece Monolithic Heavy Cast Iron Housing with High Thermal Dissipation Surface Area |
| Shaft & Mounting Options | Keyed Hollow Shaft, Hollow Shaft with Shrink Disc, Solid Output Shaft, Shaft-Driven Forced Oil Pump, Backstop Option |
Documentation & Resources
Rossi S Series Frame Size, Torque & Ratio Selection Matrix
Complete selection matrix for Rossi S Series heavy 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 Options (i) | Rossi Model Code Example | Output Shaft Style |
|---|---|---|---|---|---|
| Size 140 / 160 | Parallel / Bevel-Helical | 18,000 Nm | 2:1 - 400:1 | S 2I 160 UO2A - 16 | Hollow / Solid Output |
| Size 180 / 200 | Parallel / Bevel-Helical | 38,000 Nm | 2:1 - 400:1 | S 2I 200 UO2A - 25 | Hollow / Shrink Disc |
| Size 225 / 250 | Parallel / Bevel-Helical | 75,000 Nm | 2:1 - 400:1 | S 3IV 250 UO2A - 40 | Hollow / Shrink Disc |
| Size 280 / 320 | Parallel / Bevel-Helical | 140,000 Nm | 2:1 - 400:1 | S 3IV 320 UO2A - 50 | Heavy Duty Solid/Hollow |
| Size 355 / 400 | Parallel / Bevel-Helical | 250,000 - 400,000 Nm | 2:1 - 1,250:1 | S 3IV 400 UO2A - 63 | Heavy Duty Mining Shaft |
Conventional Heavy Reducer to Rossi S Series Upgrade Guide
Direct replacement guide for upgrading conventional split-housing heavy industrial gearboxes to Rossi S Series single-piece monolithic cast-iron units:
| Conventional Heavy Industrial Gearbox | Common Industry Failure Modes | Current Rossi S Series Equivalent | Key Upgrades & Monolithic Advantages |
|---|---|---|---|
| Split-Case Parallel Shaft Industrial Reducer | Oil leaking at casing seams under peak torsional flex and heavy shock loads | Rossi S 2I 180 / S 2I 200 100% Monolithic Frame | Rigid single-piece monolithic cast-iron housing eliminates joint flex and prevents oil leaks. |
| Standard Bevel-Helical Heavy Conveyor Drive | Gear mesh displacement under severe overhung radial load from belt tension | Rossi S 3IV 225 / S 3IV 250 Heavy Bearing Support | Oversized tapered roller bearings and monolithic rigidity maintain precise gear contact. |
| Heavy Industrial Mixer/Agitator Reducer | Thermal overheating during 24/7 continuous operation in hot processing environments | Rossi S 3IV 320 with Fan/Cooler High Thermal Rating | Finned housing casting, axial shaft cooling fan, and forced oil lubrication option. |
Expert Technical Sourcing & Industrial Drive Integration Notes
When replacing older heavy industrial gearboxes or retrofitting severe processing lines, switching to Rossi S 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., S 2I 200 UO2A - 25 or S 3IV 250 UO2A - 40), and our technical engineering team will deliver a 100% compliant replacement specification and proposal.
Core Benchmark Model Standard Configurations
- S 2I 140 UO2A (Heavy Parallel Reducer)
- S 2I 160 UO2A (Heavy Parallel Reducer)
- S 2I 180 UO2A (Heavy Parallel Reducer)
- S 2I 200 UO2A (Heavy Parallel Reducer)
- S 3IV 160 UO2A (Heavy Bevel Reducer)
- S 3IV 200 UO2A (Heavy Bevel Reducer)
- S 3IV 250 UO2A (Heavy Bevel Reducer)
- S 3IV 320 UO2A (Heavy Bevel Reducer)
- Rossi Size 160 Heavy Industrial Gearbox
- Rossi Size 200 Heavy Industrial Gearbox
- Rossi Size 250 Heavy Industrial Gearbox
- Rossi Size 320 Heavy Industrial Gearbox
- Rossi S Series Monolithic Heavy Cast Iron
- Rossi S Series Keyless Shrink Disc Output
- Rossi S Series Mechanical Backstop
- Rossi S Series Axial Cooling Fan Unit
- Rossi S Series Forced Oil Lubrication
- Rossi Heavy Duty Mining Conveyor Drive
- Rossi Heavy Duty Bucket Elevator Drive
- Rossi Heavy Duty Agitator Reducer
