Hydrostatic Final Drives for High-Clearance Corn Detasselers in Brazil’s Seed Production Belt.
Critical Mobility for Hybrid Seed Production
In the high-stakes world of hybrid corn seed production (“Milho Semente”), timing is non-negotiable. The removal of the male tassel (o pendão) from the female corn plant must happen within a strict 5 to 7-day window to prevent self-pollination and ensure genetic purity. This operation takes place in the height of summer, often under muddy conditions, requiring specialized machines known as Corn Detasselers (Despendoadoras de Milho).
These machines are characterized by their extreme ground clearance (often exceeding 2 meters) to pass over full-grown corn. Traditional axle drives are impossible here; an axle would crush the valuable crop. The engineering solution is the Planetary Wheel Hub Drive (Redutor Final de Roda). This compact, high-torque gearbox sits directly inside the wheel rim, driven by a hydraulic motor. It eliminates the need for mechanical axles, allowing for a variable track width and maximum crop clearance.
EVER-POWER的 PH-Series (Planetary Hub) is the propulsion standard for these machines. Integrating a high-speed hydraulic motor input with a multi-stage planetary reduction, these units deliver the massive low-speed torque required to push a 4WD machine through heavy clay soils while offering the precise speed control needed for delicate cutter or puller operations.
Technical Specifications: PH-Series (Hydrostatic Drive)
| 范围 | 规格 | 范围 | 规格 |
|---|---|---|---|
| Output Torque (Max) | 3,500 Nm – 15,000 Nm | 缩减率 | 18:1 to 60:1 (2-Stage) |
| Input Speed (Max) | 3,500 RPM | 输出速度 | 0 – 150 RPM (Variable) |
| 房屋材料 | 球墨铸铁 QT500-7 | Input Motor | Hydraulic Piston/Orbit (SAE) |
| Parking Brake | Integrated Multi-Disc (Static) | Brake Torque | Up to 600 Nm (Hold) |
| Disengagement | Mechanical Disconnect (For Towing) | Radial Load | 40 kN – 120 kN (Dynamic) |
| 齿轮类型 | Planetary (Sun-Planet-Ring) | 齿轮材料 | 20CrMnTiH（表面硬化） |
| 轴承类型 | 重型锥形滚轮 | Wheel Studs | 8 or 10 Studs (M18/M20) |
| 密封系统 | Mechanical Face Seal (Duo-Cone) | 润滑 | 油浴式（SAE 85W-140） |
| 石油产能 | 1.5 Liters – 3.0 Liters | 刹车释放 | Hydraulic Pressure (15-30 bar) |
| 重量（干重） | 45 kg – 90 kg | 安装 | Flange to Chassis Frame |
| 画 | Polyurethane Black / Grey | 保修单 | 24个月 |
| 兼容性 | Danfoss / Rexroth / Poclain | 应用 | Detasseler / High Clearance Sprayer |
Engineering the “Compact Power”
1. Hydrostatic Integration
Detasselers require infinite speed variability—creeping slow for dense tassel pulling, and fast for transport. The PH-Series gearbox is designed to accept a high-speed hydraulic motor (via SAE A/B/C flange). The gearbox converts this high RPM/low torque hydraulic energy into the low RPM/high torque mechanical force needed to turn the large diameter (R38 or R46) narrow tires, providing smooth acceleration without gear shifting.
2. Load Bearing Hub Design
In a planetary hub drive, the gearbox IS the wheel hub. It must support the entire weight of the machine (Radial Load) and the cornering forces (Axial Load). We utilize massive, widely spaced 圆锥滚子轴承 within the housing. The ring gear is often part of the stationary housing, while the planet carrier drives the rotating hub (or vice versa), structurally integrated to withstand the bending moments of a fully loaded machine on a side slope.
3. 集成式驻车制动器
Safety is paramount. Hydrostatic systems can leak down, causing the machine to roll. Our PH-Series includes an internal 弹簧施加式液压释放（SAHR）多片式制动器. When the engine is off or hydraulic pressure drops, the springs clamp the discs, locking the wheel instantly. This “Fail-Safe” mechanism ensures the detasseler stays parked even on the hilly terrain of seed farms.
4. The Towing Disconnect
If a hydrostatic machine breaks down in the field, it cannot be towed because the hydraulic fluid locks the motor. Forcing it destroys the system. Our gearboxes feature a Mechanical Disconnect. By flipping a cap or pushing a central button on the hub face, the planetary sun gear disengages from the input, allowing the wheel to freewheel so the machine can be towed safely to the workshop.
Comparative Analysis: Hub Drive vs. Chain Drop vs. Mechanical Axle
| 特征 | Planetary Hub (PH Series) | Chain Drop Box | Mechanical Axle |
|---|---|---|---|
| Crop Clearance | Maximum (No axle) | 高的 | Low (Axle breaks corn) |
| 维护 | Low (Sealed oil) | High (Chain stretch/lube) | Medium (U-joints) |
| 扭矩密度 | 非常高 | 中等的 | 中等的 |
| 速度控制 | Infinite (Hydrostatic) | Hydraulic or Mech | Geared Steps |
| 成本 | 较高的初始 | Lower | Lowest |
*Based on fleet data from seed corn producers in Paracatu, MG.
本地化应用：巴西农业企业
Seed Corn (Paracatu & Goiás)
The “Safrinha” seed production season requires machines to work in the wettest months. Detasselers with our Planetary Hubs can operate in muddy clay where conventional tractors get stuck. The Duo-Cone Seals protect the internal gears from liquid mud ingress, ensuring the machine completes the critical 7-day detasseling window without downtime.
Self-Propelled Sprayers
Beyond detasselers, our PH-Series hubs are used on mid-size sprayers (“Pulverizadores”). The high reduction ratio allows for the use of smaller, more efficient hydraulic motors, reducing the overall heat load on the hydraulic system and improving fuel efficiency for the diesel engine.
📒 Field Engineer’s Log: The “Locked” Wheel
“January 2026, Cristalina, GO. A seed company reported a detasseler stranded in the field. The right rear wheel was locked solid. The hydraulic system had blown a hose.”
“The operator tried to tow it with a tractor, dragging the locked wheel and ruining the tire. He didn’t know about the disconnect feature.
Solution: We arrived and simply flipped the center cap on the PH-50 Hub. This physically disconnected the sun gear. The wheel spun freely, and we towed it to the shed for hydraulic repair. We then conducted a training session for the operators on the ‘Towing Disconnect’ function, saving them thousands in potential tire and gearbox damage in the future.”
常见问题解答（OEM/B2B）
1. Can I replace a Bonfiglioli or Brevini hub with this?
Yes. Our PH-Series is manufactured to ISO standards. The wheel stud pattern, chassis mounting flange, and hydraulic motor interface (SAE) are designed to be drop-in replacements for major European and American brands (e.g., Bonfiglioli 600 series, Omni, Auburn).
2. What hydraulic motors fit?
The input is typically an SAE A, B, or C cartridge mount. It accepts orbital motors (Danfoss OMP/OMR/OMS) for lower speeds or axial piston motors (Rexroth/Eaton) for high-performance applications. We supply the matching spline couplers.
3. Do I need a separate brake line?
Yes. The internal parking brake requires a dedicated hydraulic pilot line to release it (typically 20-30 bar). When the machine is running, pressure holds the brake open. When pressure is lost, springs apply the brake automatically.
4. What is the load capacity?
It varies by model. Our PH-35 is rated for 3,500 kg per wheel (static), while the PH-100 can handle 10,000 kg. For corn detasselers, we typically recommend the PH-50 size to handle the dynamic loads of 4WD operation on uneven furrows.
Drive Through the Mud
Equip your detasselers with EVER-POWER Planetary Hubs for unstoppable reliability.
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记分卡结束
