Combating Pests with Velocity
Brazil holds the title of the world’s largest orange producer and coffee exporter. These high-value crops face constant threats from pests and diseases like Greening (Huanglongbing) in citrus and Hemileia vastatrix (Rust) in coffee. The primary weapon against these threats is the Air Blast Sprayer (Atomizador). This machine relies on a powerful fan to generate a high-velocity air curtain that carries micronized chemical droplets deep into the dense canopy of trees.
The heart of the atomizer is the Fan Drive Gearbox (Caixa Multiplicadora de Velocidade). Unlike most agricultural gearboxes that reduce speed to increase torque, this unit acts as a 速度提升器. It takes the standard tractor PTO input of 540 RPM and amplifies it to 1,800 or 2,200 RPM to drive the large axial fan.
EVER-POWER的 FD-Series (Fan Drive) gearboxes are engineered specifically for the thermal and inertial challenges of this application. They feature a built-in 超越离合器（Roda Livre） to handle the massive flywheel effect of the fan during shutdown, and a 2-speed shift mechanism (plus Neutral) to allow farmers to adjust air volume based on tree maturity and foliage density.
Technical Specifications: FD-Series (Sprayer Multiplier)
| 范围 | 规格 | 范围 | 规格 |
|---|---|---|---|
| 额定输入功率 | 40 HP – 110 HP (30-82 kW) | Ratios (2-Speed) | 1:3.5 / 1:4.5 (Step-up) |
| 输入速度 | 540 转/分 | Fan Speed (Output) | 1890 / 2430 RPM |
| 房屋材料 | Cast Iron HT250 / Aluminum | 最大输出扭矩 | 600 Nm (High Speed) |
| 输入轴 | 1-3/8″ Z6 (DIN 9611) | 输出轴 | Flange / Taper / Cylindrical |
| 齿轮类型 | High-Speed Helical / Bevel | 齿轮材料 | 20CrMnTiH (Grinding Class 5) |
| 轴承类型 | High-Speed Ball / Tapered | 转变 | Manual Lever (Low-Neutral-High) |
| 超速离合器 | Integrated Internal Sprag | 冷却 | Airflow Design |
| 润滑 | Synthetic Oil (ISO VG 150) | 石油产能 | 1.2 Liters – 2.5 Liters |
| 贯穿轴 | Yes (For Chemical Pump) | Through Shaft Type | 1-3/8″ Z6 (540 RPM) |
| 重量（干重） | 25 kg – 55 kg | Fan Diameter Support | 600mm – 1000mm |
| 画 | 耐热环氧树脂 | 保修单 | 24个月 |
| 安装方式 | Comer / Bondioli Standard | 热极限 | 120°C (Requires Airflow) |
Engineering the “Speed Increaser”
1. The Inertia Problem (Free Wheel)
An 800mm fan spinning at 2,000 RPM has immense kinetic energy. If the tractor operator disengages the PTO suddenly, the fan wants to keep spinning, but the tractor engine stops. Without protection, this inertia would destroy the gearbox teeth or twist the PTO shaft. EVER-POWER integrates a heavy-duty 超越离合器（Roda Livre） inside the gearbox. This allows the fan to coast down safely for minutes after power is cut, protecting the drivetrain.
2. Thermal Management at High RPM
Speed increasers generate more heat than reducers due to fluid friction at high agitation speeds. However, the fan gearbox has a unique advantage: it sits directly in the airflow path. Our housing is designed with Aerodynamic Cooling Fins that harness the 100 km/h wind generated by the sprayer fan to actively cool the oil sump, keeping temperatures stable even in the 40°C heat of Ribeirão Preto.
3. The “Neutral” Importance
Sprayer operators need to mix chemicals in the tank without running the fan (to avoid blowing expensive chemicals away). Our FD-Series features a Three-Position Lever (High Speed – Neutral – Low Speed). The neutral position disconnects the fan while keeping the through-shaft spinning, allowing the rear-mounted diaphragm pump to continue agitating the tank mixture.
4. Through-Shaft Configuration
A sprayer needs to drive two things: the Fan (Air) and the Pump (Liquid). Our gearboxes feature a Through-Shaft (Eixo Passante). The PTO power enters the front, drives the step-up gears for the fan, and passes straight through the back at 1:1 speed (540 RPM) to drive the high-pressure ceramic plunger pump or diaphragm pump mounted at the rear of the machine.
Comparative Analysis: Gearbox vs. Belt Drive
| 特征 | Gearbox Drive (FD Series) | 皮带和滑轮传动 |
|---|---|---|
| 效率 | High (97% – No Slip) | Medium (Slippage common) |
| 维护 | 低（换油） | 高（皮带张力/更换） |
| 紧凑 | Very Compact | Bulky (Requires Guards) |
| Speed Change | Instant Lever Shift | Swap Pulleys (Slow) |
| 成本 | 较高的初始 | 初始值较低 |
*Data derived from performance tests in Araraquara citrus groves.
本地化应用：巴西农业企业
Citrus (São Paulo)
Citrus trees are dense and tall. Penetrating the canopy to kill psyllids (Greening vector) requires maximum air velocity. Farmers use the High Gear (1:4.5) to spin the fan at 2,200 RPM, creating a storm that flips leaves and coats the undersides. Our gearboxes are built to run at this red-line speed all day.
Coffee (Minas Gerais)
Coffee bushes are more delicate. Blasting them with too much air knocks off berries or flowers. Farmers shift to Low Gear (1:3.5) for a gentler breeze that carries the fungicide for Rust control without mechanical damage to the crop.
📒 Field Engineer’s Log: The “Exploding” Fan
“October 2025, Franca, SP. A coffee grower called us. His sprayer gearbox had seized, and the inertia snapped the PTO shaft. We investigated.”
“The internal overrunning clutch (sprag) had rusted solid. The farmer had been washing the machine with a high-pressure jet, forcing water through the breather. When he disengaged the PTO at 2000 RPM, the locked clutch forced the tractor engine to stop the fan instantly. Something had to break.
解决方案：我们用我们的设备替换了原设备。 Sealed Sprag Design and installed a ‘Labryinth Cap’ breather that blocks direct water jets. We also advised the farmer to check the clutch freewheeling action by hand before every season.”
常见问题解答（OEM/B2B）
1. Can I use this gearbox for a tower sprayer?
Yes. The FD-Series output shaft is typically a flange designed to bolt onto the fan hub. It supports both standard axial fans and “Tower” (Torre) deflectors used in dense orchards, provided the fan assembly is balanced (G6.3 grade).
2. What happens if I shift gears while running?
Never do this. The gearbox uses a sliding collar mechanism (dog clutch). Shifting under load or rotation will grind the gears and can shear the shift forks. Always stop the PTO and let the fan stop completely before changing speed.
3. Do you supply the propeller hub?
We offer output shafts with standard metric flanges or cylindrical keys. We can also supply a specialized Centrifugal Clutch Hub as an add-on, which provides a soft start for the fan, reducing wear on the gearbox gears.
4. Is synthetic oil required?
Yes. Due to the high RPM (2,200+) and speed-increasing nature (which generates heat), we strongly recommend Synthetic ISO VG 150 or 220. Mineral oils oxidize too quickly at these temperatures, leading to sludge buildup.
Velocity Meets Reliability
Equip your atomizers with EVER-POWER Fan Drives for consistent air blast performance.
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