The Backbone of Tobacco & Cassava Farming
In the Southern states of Brazil (Rio Grande do Sul, Santa Catarina), small-scale family farming relies heavily on high-value crops like Tobacco (Fumo) and Cassava (Mandioca). These crops require raised soil beds to ensure drainage and root expansion. The Rotary Ridge Plough (Encanteirador Rotativo) is the machine of choice. Unlike passive disc ridgers, the rotary ridger uses active power to pulverize the soil and throw it upwards into a perfect trapezoidal shape.
El Ridge Plough Gearbox is a specialized high-speed transmission. It must take the standard 540 RPM from the tractor and increase it to 300-400 RPM at the rotor shaft to create the centrifugal force needed to shape the bed. This “Speed Increaser” function generates significant internal heat and load.
EVER-POWER's RP-Series Gearboxes are designed with a unique “High-Flow” oil circulation system and reinforced output bearings to handle the lateral thrust loads generated when the ridging blades bite into compacted clay. Our gearboxes are the preferred OEM choice for Brazilian manufacturers of bed formers and plastic mulch layers.
Technical Specifications: RP-Series (Ridger / Bed Former)
| Parámetro | Especificación | Parámetro | Especificación |
|---|---|---|---|
| Potencia de entrada | 40 HP – 90 HP (30-67 kW) | Relación de transmisión | 1:1.25 / 1:1.5 (Increaser) |
| Velocidad de entrada | 540 RPM | Velocidad de salida | 280 – 450 RPM |
| Max Torque Capacity | 1,850 Nm | Material de la carcasa | Hierro dúctil QT450-10 |
| Eje de entrada | 1-3/8″ Z6 (DIN 9611) | Eje de salida | Hexagonal 40 mm / 50 mm / Estriado |
| Tipo de engranaje | Spiral Bevel (Gleason) | Material del engranaje | 20CrMnTiH (HRC 58-62) |
| Aspectos | Tapered Roller (32210) | Sistema de sellado | Cassette Seal (Agriculture) |
| Lubricación | Baño de aceite (SAE 90) | Capacidad de aceite | 2.5 Liters |
| Configuración | T-Box (Dual Side Output) | Montaje | 4-Bolt Top or Front Flange |
| Eje pasante | Optional (For rear pump) | Temperatura de funcionamiento | -20°C to +100°C |
| Descanso | Filtered Press-Fit | Peso (seco) | 32 kg – 55 kg |
| Pintar | Epoxy Blue / Red / Black | Garantía | 18 meses |
| Shock Load Factor | 1.5 (Moderate) | Nivel de ruido | < 80 dB(A) |
Engineering the “Active Ridger”
1. The Lateral Thrust Solution
In a rotary ridger, the blades cut the soil and throw it laterally inwards to form the bed. This creates a significant Axial Thrust Load on the output shafts, pushing them back into the gearbox housing. Standard snap-ring retainers can fail under this load. EVER-POWER uses a Threaded Bearing Pre-Load Nut system. This mechanically locks the output bearings against the housing shoulder, preventing any axial movement of the shaft, ensuring gear mesh stability.
2. Speed Increasing Thermal Management
To pulverize soil finely for vegetable seeds, the rotor must spin fast (400 RPM). The gearbox acts as a speed increaser. This generates more heat than a reducer. Our housing design features “Turbulence Fins” inside the casting that agitate the oil, preventing stagnant hot spots. We also use high-temp FKM seals as standard to handle operating temperatures up to 110°C during continuous summer operation.
3. The Dust-Proof Labyrinth
Tobacco fields in dry seasons are clouds of fine, abrasive dust. This dust can destroy a lip seal in days. We employ a Dual-Stage Sealing System: An external steel labyrinth shield (slinger) that physically repels dirt, protecting the internal Cassette Seal. The cassette seal itself contains multiple sealing lips and integrated grease, providing a final barrier against micro-particles.
4. Versatile Mounting Geometry
Different crops require different bed widths. Manufacturers need flexibility. Our gearboxes feature a Universal Mounting Flange with multiple bolt patterns. The output shafts can be customized (Hex, Round, or Spline) to fit various rotor tube diameters. We also offer extended output shafts for “Wide-Bed” vegetable formers used in melon and pumpkin farming.
Comparative Analysis: Rotary Ridger vs. Disc Ridger
| Característica | Rotary Ridger (Active Gearbox) | Disc Ridger (Passive) |
|---|---|---|
| Soil Texture | Fine / Pulverized (Seed Ready) | Cloddy / Rough |
| Weed Control | High (Chops roots) | Low (Buries weeds) |
| Bed Shape | Precise Trapezoid (Firm) | Loose Mound |
| Energy Source | PTO (Efficient Torque) | Traction (Wheel Slip) |
| Costo | Higher (Gearbox + Rotor) | Lower (Steel Frame) |
*Data based on tobacco yield comparison in Santa Cruz do Sul.
Aplicación localizada: Agronegocios en Brasil
Tobacco Farming (Rio Grande do Sul)
Tobacco seedlings are delicate. They require a high, well-drained bed free of clods. Our RP-Series gearboxes provide the high rotor speed needed to pulverize the heavy clay soil, creating a fluffy bed that promotes rapid root establishment. The compact design allows for narrow row spacing typical of family farms.
Cassava/Mandioca (Paraná)
Cassava roots need loose soil to expand. A rotary ridger breaks the hardpan and forms a massive ridge. Our gearboxes are equipped with Reinforced Output Shafts (Hex 50mm) to drive the large diameter (600mm) rotors required to move the volume of soil needed for deep cassava beds.
📒 Field Engineer’s Log: The Dust Bowl Failure
“September 2025, Venâncio Aires, RS. A tobacco farmer complained that his ridger gearbox was leaking oil after only one month. We inspected the unit. The environment was extremely dusty. The standard rubber lip seal had been ground away by the abrasive soil accumulating on the shaft.”
“We replaced the seal with our ‘Cassette Seal’ (Selo K7) and installed a custom-made steel labyrinth shield on the rotor hub. This shield covers the seal housing, creating a tortuous path that dust cannot penetrate. We checked back at the end of the season: zero leaks, and the shaft surface was pristine.”
Preguntas frecuentes (OEM/B2B)
1. Can I change the rotation direction of the output shafts?
Yes. By moving the crown gear to the opposite side of the pinion shaft during assembly, we can reverse the rotation direction. Standard rotation is typically “top-in” to pull soil towards the center of the bed.
2. Do you offer a gearbox with a through-shaft for multiple rows?
Yes, our RP-Series T-boxes are available with a Through-Shaft (Passante) configuration. This allows you to chain multiple gearboxes together to build a 2-row, 3-row, or 4-row bed former machine driven by a single PTO input.
3. What is the maximum recommended rotor diameter?
For our standard RP-50 gearbox, we recommend a max rotor diameter of 500mm. For larger high-bed cassava ridgers (600-700mm rotors), we recommend upgrading to the RP-80 Heavy Duty series to handle the increased leverage torque.
4. Can this gearbox handle rocky soil?
While the gears are hardened, we strongly recommend using a Slip Clutch (Embreagem de Disco) on the PTO shaft when working in rocky terrain. The gearbox is shock-load rated, but a direct rock strike at 400 RPM can still exceed the breaking limit of steel without a safety clutch.
Complete su sistema de encofrado de camas
Ridger Blades
Curved C-blades or L-blades (Boron Steel) for efficient soil lifting.
Ejes de toma de fuerza
Friction clutch PTOs calibrated for high-speed ridging operations.
Perfect Beds Start with Perfect Gears
Equip your ridgers with EVER-POWER Gearboxes for consistent, high-speed bed forming.
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Major Markets: Brazil, Paraguay, Indonesia, Nigeria, India.
