Description
EP-EQ4250 4-Stage Ultra-High Ratio Planetary Gearbox
Brevini Riduttori EQ4250 Compatible Replacement | EVER POWER
The EQ4-series achieves ratio ranges up to 500:1 in a single housing by stacking four planetary stages ?? the highest reduction option in the EC/EM family. Designed for very slow-speed drives, large industrial positioning systems, antenna and telescope slew drives, kiln and furnace car drives, and large-scale material handling applications where output speed is measured in RPM fractions and maximum torque is non-negotiable.
The EP-EQ4250 replaces the Brevini riduttori EQ4250 ?? a 4-stage planetary gearbox delivering approximately 112,000 Nm output torque, ratio range 50:1 – 500:1, and IP rating IP66.
Technical Parameters
| Parameter | Value |
|---|---|
| Model | EP-EQ4250 |
| Replaces | Brevini riduttori EQ4250 |
| Output Torque | 112,000 Nm |
| Gear Stages | 4 |
| Ratio Range | 50:1 – 500:1 |
| Max Input Speed | 3,000 rpm |
| Efficiency | >= 92% |
| Protection Class | IP66 |
| Approx. Weight | ~579 kg |
Working Principle
Four coaxial planetary stages cascade speed reduction and torque multiplication. Stage 1 handles the high-speed motor input; each successive stage multiplies torque while halving speed. The 4-stage design uses a dual-seal output shaft arrangement ?? a primary FKM lip seal plus a labyrinth ?? providing redundant protection against dust and slurry ingress in the slow-speed, high-torque industrial environments where EQ4 units are most commonly deployed.
Core Advantages
|
● Up to 500:1 Single Housing
Eliminates tandem gearbox arrangements for extreme ratios. |
● Dual-Seal Output Shaft
Primary FKM seal plus labyrinth ?? redundant ingress protection. |
|
● IP66 Standard Sealing
Outdoor and wet industrial environment rated. |
● 4-Stage Torque Density
Maximum torque for given housing size in the EC/EM range. |
|
● Direct EQ4-Series Replacement
Identical flange and port dimensions. |
Structure and Material Technology
All four stages use 17CrNiMo6 carburised and ground steel gears. Output stage planet journals run on needle roller bearings with hardened pins for maximum radial stiffness. The housing is cast from GGG50 ductile iron with H7 bore tolerances throughout. External coating is epoxy-chromate primer for C4 corrosion zone service.
Typical Application Scenarios
| Industry | Application | Key Benefit |
|---|---|---|
| Cement | Cement mill main drive | Extreme torque for continuous ball mill grinding operations. |
| Mining | Large excavator travel drive | High torque for large tracked mining excavator travel. |
| Marine | Ship thruster drive | Reliable drive for large Azimuth propulsion thruster units. |
| Steel | Primary rolling mill main drive | Extreme torque for primary slab and bloom rolling. |
Selection Guide
- Required Output Torque (Nm) ?? Confirm peak and continuous with safety factor (1.3-2.0 typical).
- Gear Ratio ?? Motor speed (rpm) / required output speed (rpm).
- Stage Count ?? 4-stage (4-stage) provides ratio 50:1 – 500:1.
- Motor Interface ?? Flange type (SAE/ISO metric), shaft diameter and key.
- Operating Environment ?? IP class, ambient temperature, mounting orientation.
Contact our engineers for a free application sizing review.
Brevini EQ4250 vs. EVER POWER EP-EQ4250
Notice: EVER POWER references Brevini riduttori EQ4250 solely for customer cross-reference. We are not affiliated with Brevini. Our EP-EQ4250 is an independently designed product that is dimensionally and functionally compatible. No Brevini trademarks or intellectual property are reproduced.
| Aspect | Brevini EQ4250 | EVER POWER EP-EQ4250 |
|---|---|---|
| Price | OEM European premium | Competitive ?? 30-45% saving typical |
| Lead Time | 6-16 weeks depending on size | 2-6 weeks |
| Gear Stages | 4 | 4 |
| Warranty | 12 months standard | 18 months standard |
| Customisation | Limited | OEM/ODM drawings accepted |
EVER POWER also supplies matched electric and hydraulic motors for complete drive system packages. Enquire about motor pairing.
Quality Certifications and Service Commitment
- ISO 9001:2015 certified manufacturing and quality management.
- CE Marking ?? EU Machinery Directive 2006/42/EC compliant.
- 18-month warranty from shipment date covering all EP-EQ4250 manufacturing defects.
- 48-hour technical response for field issues.
- Seal kits and wear parts stocked for rapid dispatch.
Learn more at EVER POWER About Us.
Case Studies ?? Engineer Field Notes
| Country | Application | Customer Feedback |
|---|---|---|
| UAE | Cement mill main drive, large plant | “Extreme torque requirement met. CE documentation accepted by our local regulator without question.” ?? Plant Director, Abu Dhabi. |
| Australia | Large mining excavator travel drive, iron ore mine | “Class-leading torque handled the hardest magnetite bench conditions without overload.” ?? Equipment Director, Pilbara. |
| Netherlands | Ship thruster drive, heavy offshore vessel | “EVER POWER delivered on a very tight shipyard schedule. The gearbox was dimensionally exact.” ?? Marine Engineer, Rotterdam. |
Frequently Asked Questions
Q: What is the minimum output speed achievable?
A: With a 3,000 rpm input and the 500:1 maximum ratio, minimum output speed is 6 rpm. Lower speeds require a proportional reduction in input speed.
Q: Can the EQ4-series handle reversing loads?
A: Yes. All four stages are rated for equal forward and reverse torque. Fatigue life calculations assume 50/50 direction split.
Partner With EVER POWER
EVER POWER supports OEM machine builders and maintenance teams worldwide. Browse our full replacement range, explore our capabilities, or contact us today for a fast quotation. Visit planetary-gear-box.top.
