The Apex of Torque Transmission
In the heavy industry of Brazilian agriculture, specifically in the livestock feedlots (Confinamentos) of Goiás and the massive sugarcane mills of São Paulo, conventional gearboxes reach their physical limits. When an application requires moving 20 tons of wet cattle feed or driving a 500-meter center pivot irrigation system through mud, the Agricultural Planetary Gearbox (Caixa Redutora Planetária) is the only viable engineering solution.
Defined by its “Epicyclic” design—a central Sun gear surrounded by multiple Planet gears inside a Ring gear—the planetary gearbox offers the highest Torque Density of any mechanical transmission. By distributing the load across 3, 4, or 5 planet gears simultaneously, these units can handle shock loads and continuous torque outputs that would shatter a parallel shaft gearbox of twice the size.
EVER-POWER’s PG-Series (Planetary Gear) is designed specifically for the rigorous demands of the Brazilian market. From vertical auger drives in TMR mixers (Misturadores de Ração Total) to biogas agitators and sugar cane harvester track drives, our modular planetary systems provide reduction ratios from 3:1 to 3000:1, ensuring that high-speed hydraulic or electric power is converted into the unstoppable low-speed torque required by modern agribusiness.
Technical Specifications: PG-Series (Heavy Duty Planetary)
| Parameter | Specification | Parameter | Specification |
|---|---|---|---|
| Output Torque | 1,000 Nm – 650,000 Nm | Reduction Ratio | 3.5:1 to 3000:1 (Multi-Stage) |
| Input Power | 10 HP – 500 HP (7.5-375 kW) | Input Speed | Up to 3000 RPM (Hydraulic/Electric) |
| Housing Material | Spheroidal Graphite Iron (GGG40/50) | Gear Material | 20CrMnTi / 42CrMo4 (Carburized) |
| Sun/Planet Gears | Profile Ground (DIN Class 6) | Ring Gear | Nitrided Alloy Steel |
| Input Interface | SAE Hydraulic / IEC Electric / Shaft | Output Shaft | Solid Splined / Hex / Hollow Shrink Disc |
| Bearing Type | Oversized Tapered Roller | Axial Load Capacity | High (Designed for Mixer Weight) |
| Sealing System | Mechanical Face Seal / Multi-Lip | Lubrication | Splash Oil / Forced Circulation |
| Oil Capacity | 2.0 Liters – 80.0 Liters | Efficiency | 97% per stage |
| Mounting | Flange / Foot / Shaft Mount | Brake System | Optional Multi-Disc Static Brake |
| Weight | 40 kg – 1500 kg | Thermal Rating | Requires Expansion Tank for High Duty |
| Paint | Industrial Epoxy (200 microns) | Warranty | 24 Months / 5000 Hours |
| Application | TMR Mixer / Wheel Drive / Track | Service Factor | 2.0 (Heavy Shock) |
Engineering the “Load Split”
1. Epicyclic Load Sharing
In a standard gearbox, power is transmitted through a single tooth contact point. In our PG-Series planetary gearbox, the Sun gear drives three or more Planet gears simultaneously. This divides the torque load by the number of planets. A 50,000 Nm load becomes three manageable 16,600 Nm loads. This architecture allows us to pack immense power into a footprint 60% smaller than a parallel shaft unit, crucial for mounting inside the wheel hubs of harvesters or under the tub of a feed mixer.
2. Modular Staging
Achieving high reduction ratios (e.g., slowing a 1500 RPM hydraulic motor down to 20 RPM for a mixer) requires multiple gear stages. Our modular design allows us to stack planetary stages (Sun-Planet-Ring sets) inline. A single stage offers ratios from 3:1 to 7:1. By stacking three stages, we achieve ratios over 300:1 with negligible efficiency loss, providing the “breakout torque” needed to start a fully loaded 20-ton mixer wagon after a weekend stoppage.
3. Integrated Output Bearings
For applications like TMR Mixers (Misturadores Verticais), the gearbox doesn’t just turn the auger; it supports it. The weight of the steel auger plus 10 tons of feed rests directly on the gearbox output shaft. We reinforce the output stage with massive, wide-stance Tapered Roller Bearings capable of supporting 20+ tons of static axial load, eliminating the need for external thrust bearings in the machine design.
4. Right-Angle Input Modules
While planetary gears are naturally inline, many agricultural implements (like PTO-driven mixers) require a 90-degree input. We integrate a robust Spiral Bevel Gear Stage at the input of the planetary stack. This allows the PTO shaft to connect horizontally while the planetary stages drive the vertical auger, combining the versatility of a bevel box with the torque density of a planetary.
Comparative Analysis: Planetary vs. Parallel Shaft
| Feature | Planetary Gearbox (PG Series) | Parallel Shaft / Helical Box |
|---|---|---|
| Torque Density | Very High (Compact) | Medium (Bulky) |
| Shock Resistance | Excellent (Load Shared) | Good (Single tooth contact) |
| Overhung Load | High (Integrated Bearings) | Moderate |
| Ratio Range | Huge (3:1 to 3000:1) | Limited (Usually < 100:1) |
| Cost | Higher Initial Investment | Lower |
*Based on lifecycle analysis of 18m³ TMR mixers in Paraná dairy farms.
Localized Application: Brazil Agri-Business
TMR Mixers (Goiás Feedlots)
Vertical mixers are the backbone of intensive beef production. They must cut and mix huge bales of hay. Our PG-Series gearboxes provide the extreme low-speed torque (20 RPM output) to drive the vertical auger knives through dense, fibrous bales without stalling, even when the mixer is filled to capacity (15+ tons).
Irrigation (Center Pivot)
Center pivot systems require small but ultra-reliable wheel drives. Our Wheel Drive Planetary units reduce the high-speed electric motor input (1500 RPM) to creeping wheel speeds (1-2 RPM). They are fully sealed (IP68) to operate in mud and water for years without maintenance, ensuring the pivot never gets stuck in the field.
📒 Field Engineer’s Log: The “Frozen” Mixer
“July 2025, Castro, PR. A dairy cooperative reported repeated gearbox failures on their 24m³ vertical mixer. The original gearboxes were shearing the output shafts during startup on cold mornings.”
“The issue was under-sizing. The OEM calculated torque based on running load, not ‘breakout’ load with settled, wet silage.
Solution: We retrofitted the mixers with our PG-2500 Heavy Duty Planetary. We increased the service factor to 2.5 and utilized a splined output shaft instead of a keyed one to distribute the stress. We also added an oil expansion tank to manage thermal cycles. The mixers now handle full-load startups effortlessly, and the splined connection shows zero wear after 2,000 hours.”
Frequently Asked Questions (OEM/B2B)
1. Do these gearboxes require an external oil cooler?
It depends on the duty cycle and input power. For intermittent use (e.g., mixing for 30 mins), static oil is fine. For continuous operation (e.g., biogas agitators running 24/7), we strongly recommend an external Circulating Oil Cooling System to keep oil temps below 80°C and preserve seal life.
2. Can I replace a Brevini or Bonfiglioli gearbox with this?
Yes. Our PG-Series is designed with standard ISO mounting flanges and output spline dimensions that match major global brands like Brevini, Bonfiglioli, and Reggiana Riduttori. We offer ‘Drop-In’ replacements that require no modification to the machine frame.
3. What is the maximum angle of operation?
Standard units can operate up to 15 degrees tilt. For mobile applications (harvesters on hills), we must customize the oil level and internal baffling to ensure the upper bearings do not run dry. Please specify your max slope.
4. Do you supply the hydraulic motor?
Yes, we offer complete “Geared Motor” Packages. We mount and test the hydraulic motor (Danfoss/Eaton orbital or piston type) or electric motor (WEG) to the gearbox at our factory, shipping you a ready-to-install unit.
Complete Your Heavy Duty System
Wheel Drives
Planetary hubs with integrated hydraulic braking for harvesters and sprayers.
Slew Drives
Worm-gear slewing rings for rotating chutes on grain carts and forage harvesters.
Input Adapters
Bell housings and elastic couplings to connect motors to planetary inputs.
Torque Without Compromise
When the load is heavy and the conditions are tough, trust EVER-POWER Planetary Technology.
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Major Markets: Brazil, Germany, Italy, China, USA.
