Efficiency in a Straight Line
In the heavy-duty agricultural landscape of Brazil, where Sugarcane (Cana-de-Açúcar) reigns supreme in São Paulo and Soybean dominates Mato Grosso, power transmission requirements often differ from standard PTO applications. While bevel gearboxes turn power 90 degrees, the Agricultural Parallel Shaft Gearbox (Caixa de Transmissão de Eixos Paralelos) is the unsung hero of inline torque multiplication and speed reduction.
This gearbox type is defined by its input and output shafts running parallel to each other, often offset by a specific distance. This configuration allows for the use of Helical Gears, which offer superior contact ratios, quieter operation, and significantly higher efficiency (up to 98% per stage) compared to worm or bevel gears. They are the standard for high-power applications like the base cutter drives of sugarcane harvesters, the main augers of large grain carts (bazucas), and the mixing screws of TMR feed wagons.
EVER-POWER's PS-Series (Parallel Shaft) gearboxes are engineered to replace belt and chain drives, offering a maintenance-free, enclosed solution that is impervious to the dust and trash of the harvest. Built with rigid cast iron housings and case-hardened alloy steel gears, they provide the relentless torque needed to process the dense biomass of Brazilian crops.
Technical Specifications: PS-Series (Offset Reducer)
| Parametro | Specifica | Parametro | Specifica |
|---|---|---|---|
| Potenza in ingresso | 30 HP – 250 HP (22-185 kW) | Opzioni di rapporto | 1:1 to 1:6 (Single Stage) |
| Velocità di ingresso | 540 / 1000 giri/min | Velocità di uscita | 90 – 1000 RPM |
| Materiale dell'alloggiamento | Grey Iron HT250 / Ductile QT450 | Coppia di uscita massima | Up to 4,500 Nm |
| Albero di ingresso | 1-3/8″ or 1-3/4″ Spline | Albero di uscita | Solid Keyed / Hollow Bore |
| Tipo di ingranaggio | Helical (Single/Double Reduction) | Materiale dell'ingranaggio | 20CrMnTiH (Carburized 60HRC) |
| Tipo di cuscinetto | Tapered Roller / Cylindrical | Shaft Arrangement | Parallel Offset |
| Sistema di tenuta | Doppio labbro NBR / FKM | Lubrificazione | Splash Oil Bath (SAE 90) |
| Capacità dell'olio | 1.5 Liters – 8.0 Liters | Montaggio | Foot Mount / Shaft Mount |
| Limite termico | 100°C Continuo | Efficienza | > 96% |
| Peso (secco) | 35 kg – 180 kg | Respiro | Filtered High-Flow |
| Colore | Epoxy Blue / Grey / Red | Garanzia | 18 mesi |
| Applicazione | Chopper / Crusher / Mixer | Protezione da sovraccarico | Optional Hydraulic Clutch |
Engineering the “Offset” Advantage
1. The Power of Helical Gears
Parallel shaft gearboxes use Helical Gears (Engrenagens Helicoidais). The teeth are cut at an angle to the face of the gear. This allows multiple teeth to be in mesh at the same time (High Contact Ratio). The result is smoother power transmission, higher load capacity, and significantly less noise compared to the straight spur gears often used in cheaper boxes. This is critical for operator comfort during long harvest shifts.
2. Modular Offset Design
The “Offset” (distance between input and output centers) is a key design parameter. It allows the gearbox to bridge the gap between the tractor PTO and the implement’s working components. EVER-POWER offers various center distances to allow OEMs to position the gearbox perfectly for belt tensioning or direct drive alignment, eliminating the need for complex intermediate jackshafts.
3. Reversible Operation
Unlike worm gears, parallel shaft gearboxes are highly efficient in both directions. This allows them to be used in Reversing Applications. For example, in a sugarcane billet planter or a grain auger, being able to reverse the drive to clear a blockage is a mandatory feature. Our gearboxes handle reverse torque loads with equal capacity to forward drive.
4. Hydraulic Motor Readiness
Modern implements are moving towards hydraulic power. Our PS-Series can be equipped with an SAE Hydraulic Motor Flange (A, B, or C) on the input side. This converts the gearbox into a high-torque hydraulic reducer, perfect for driving variable-rate fertilizer applicators or independent conveyor systems on large planters.
Comparative Analysis: Parallel Gearbox vs. Chain & Belt
| Caratteristica | Parallel Gearbox (PS Series) | Chain / Belt Drive |
|---|---|---|
| Manutenzione | Low (Oil Change only) | High (Tensioning, Greasing) |
| Efficienza | Very High (98%) | Medium (Slip losses) |
| Durata | Sealed from Dust | Exposed to Elements |
| Capacità di coppia | Extreme | Limited by Belt/Chain Strength |
| Costo | Investimento iniziale più elevato | Lower Initial, High Operating |
*Data derived from sugarcane harvester fleet analysis in Ribeirão Preto.
Applicazione localizzata: Brasile Agri-Business
Sugarcane Base Cutter (São Paulo)
The base cutter (Cortador de Base) is the most abused part of a harvester. It spins heavy discs to cut thick cane stalks at ground level. Our PS-Series gearboxes are used to drive these discs. The Parallel Offset allows the hydraulic motors to be mounted higher up, away from the dirt, while the output shaft drives the cutter discs down low, protected by the heavy cast housing.
Grain Carts (Mato Grosso)
During the soy harvest, speed is essential. Grain carts (Bazucas) need to unload 30 tons of grain in minutes. A large diameter auger requires massive torque. Our parallel shaft gearboxes reduce the 1000 RPM PTO speed to the optimal 300-400 RPM for the auger screw, providing the torque to push wet grain without the belt slippage common in older designs.
📒 Field Engineer’s Log: The Jammed Auger
“March 2026, Sorriso, MT. A harvest crew called with a stuck grain cart. The unloading auger was packed solid with wet corn. The original chain drive had snapped three times trying to clear it.”
“We retrofitted the cart with our PS-150 Parallel Shaft Gearbox directly coupled to the auger flighting. We engaged the PTO at low idle. The helical gears multiplied the torque smoothly. With a deep groan, the wet corn plug broke free, and the auger started spinning.
The customer was amazed. The rigid gear drive transmitted 100% of the tractor’s torque without the ‘elasticity’ loss of a chain, proving that direct gear drive is the only way to handle high-moisture grain logistics.”
Domande frequenti (OEM/B2B)
1. Can I mount this gearbox vertically?
Standard units are designed for horizontal mounting (splash lube). However, for vertical applications (like a TMR mixer screw), we offer a “Dry-Well” version with specific bearing greasing points and sealed output shafts to prevent leaks. Please specify orientation.
2. Is it suitable for speed increasing?
Yes. Parallel shaft gearboxes are excellent speed increasers (e.g., for driving centrifugal pumps or fans). Helical gears run quieter and cooler at high speeds than spur or bevel gears. Thermal capacity must be calculated for increaser applications.
3. Do you offer a hollow output shaft?
Yes, Hollow Bore Output is a popular option for grain augers. It allows the gearbox to be slide-mounted directly onto the auger shaft, eliminating the need for couplings and alignment, creating a very compact installation.
4. What is the service factor for agricultural use?
We rate our agricultural boxes with a Service Factor of 1.5 to 2.0 based on Class II or Class III loads. This accounts for the inevitable shock loads (rocks, start-stop) found in farming, ensuring the gears don’t fail prematurely.
Complete Your Drivetrain
Riduttori ad angolo retto
For when you need to turn the corner. Bevel drives for mowers and spreaders.
Alberi cardanici per impieghi gravosi
Matched cardan shafts with friction clutches for high-torque protection.
Hydraulic Drive Kits
Flanges and couplings to connect orbital motors to our parallel gearboxes.
Replace Belts with Reliability
Upgrade your agricultural machinery with EVER-POWER Parallel Shaft Gearboxes for zero-slip performance.
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