Processing Biomass with Inertial Force
In the “Direct Planting” (Plantio Direto) systems of Brazil, managing crop residue is crucial. The Flail Mower (Trincha / Triturador de Restos Culturais) is the machine of choice for pulverizing corn stalks, sugar cane trash, and coffee prunings into a fine mulch that enriches the soil. Unlike a rotary cutter that uses a horizontal blade, the flail mower uses a high-speed horizontal drum equipped with hammers or knives.
その Flail Mower Right-Angle Gearbox is the critical link in this high-energy system. It accepts the PTO power (usually 540 RPM) and turns it 90 degrees to drive a lateral belt pulley system. Crucially, because the flail rotor acts like a giant flywheel with massive kinetic energy, the gearbox must include an integrated オーバーランニングクラッチ（Roda Livre）. Without this “Free Wheel” mechanism, the inertia of the spinning rotor would push the tractor forward even after the PTO is disengaged, causing dangerous accidents.
エバーパワーの FM-Series (Flail Mulcher) gearboxes are engineered to withstand the extreme vibration and dust of mulching operations. Built with a high thermal capacity to handle continuous heavy loads, they feature reinforced output shafts designed specifically to carry the side-load tension of 3 or 4 V-belts, ensuring reliable power transmission in the toughest Brazilian fields.
Technical Specifications: FM-Series (Mulcher Drive)
| パラメータ | 仕様 | パラメータ | 仕様 |
|---|---|---|---|
| 入力電力 | 30 HP – 160 HP (22 – 120 kW) | 速度比 | 1:2.5 / 1:3 (Speed Increaser) |
| 入力速度 | 540 / 1000 回転 | 出力速度 | 1350 – 2500 RPM (To Pulley) |
| ハウジング材質 | Ductile Iron QT450 / Grey Iron | 最大トルク | 1,200 Nm |
| 入力シャフト | 1-3/8″ Z6 (Standard PTO) | 出力軸 | Keyed (Ø35mm – Ø60mm) |
| ギアタイプ | Spiral Bevel (Quiet Operation) | ギア素材 | 20CrMnTiH（ケース硬化） |
| ベアリングタイプ | Tapered Roller / Ball (Input) | オーバーランニングクラッチ | Internal Free Wheel (Standard) |
| シーリングシステム | Double Lip NBR + Dust Shield | 潤滑 | オイルバス式（SAE 90 / 85W-140） |
| オイル容量 | 1.5リットル～4.0リットル | Output Load | High Radial (Belt Tension) |
| 取り付けインターフェース | 4ボルトベース（ユニバーサル） | 熱制限 | 110°C連続 |
| 重量（乾燥時） | 25 kg – 85 kg | ブリーザー | Anti-Splash Filtered |
| ペイント | 耐熱エポキシ | 保証 | 24ヶ月 |
| シャフト貫通 | Optional (Double Output) | 回転 | CW / CCW (Configurable) |
Engineering the “Free Wheel” Safety
1. The Inertia Problem
A flail rotor equipped with 40 heavy steel hammers spinning at 2,000 RPM has tremendous kinetic energy. When the tractor operator disengages the PTO or throttles down, the rotor wants to keep spinning. If connected rigidly, this energy would back-drive the gearbox and push the tractor forward, potentially causing accidents or destroying the PTO brake. This is why the “Free Wheel” (Roda Livre) is mandatory.
2. Internal vs. External Clutch
Older designs used an external clutter on the cardan shaft. EVER-POWER integrates the Overrunning Clutch inside the gearbox housing, usually on the input shaft. This protects the clutch mechanism from dust and debris, ensuring it remains lubricated by the gearbox oil. We use a heavy-duty Sprag or Ratchet type mechanism that engages instantly under load but releases seamlessly when the input speed drops below the output speed.
3. Handling Radial Belt Tension
Flail mowers typically use a side belt drive to absorb shock loads from rocks. This means the gearbox output shaft must support a large pulley with 3-5 belts under high tension. This creates a massive radial load (side pull) on the output bearing. We reinforce our FM-Series with オーバーサイズテーパーローラーベアリング and a thickened output shaft neck to prevent deflection and seal failure under this constant side load.
4. Thermal Dissipation
Mulching heavy corn stover or sugar cane trash requires continuous high power. The gearbox acts as a speed increaser (1:3 ratio), which inherently generates more heat than a reducer. We design our housings with Deep Cooling Fins and optimize the oil capacity to act as a heat sink. In extreme duty cycle models, we include internal oil channels to direct flow specifically to the high-speed bearings.
Comparative Analysis: Flail Mower vs. Rotary Cutter Drivetrains
| 特徴 | Flail Gearbox (FM Series) | ロータリーカッターギアボックス |
|---|---|---|
| Safety Clutch | Internal Free Wheel (Standard) | External Slip Clutch (Optional) |
| 出力接続 | Keyed Shaft (for Pulley) | Splined/Tapered (for Blade Hub) |
| 比率 | Speed Increaser (1:3) | Speed Reducer (1:1.5) |
| Shock Load | Dampened by Belts | Direct Impact on Gears |
| 仕上げ品質 | Fine Mulch | Rough Cut |
*Comparison relevant for coffee pruning management in Espírito Santo.
ローカライズされたアプリケーション: ブラジルの農業ビジネス
Coffee & Citrus (Orchard Management)
In orchards, “Trinchas” are used to mulch prunings between rows. The gearbox must act as a スピードアップ to spin the rotor fast enough to shred hard coffee wood. The internal free wheel is essential because orchard tractors stop and start frequently at row ends, protecting the transmission from the rotor’s momentum.
Sugar Cane Trash (Palha)
After harvest, a thick layer of trash remains. Flail mowers chop this to accelerate decomposition. These machines run at high power (100HP+). Our FM-Series heavy-duty boxes feature スパイラルベベルギア to transmit this high horsepower quietly and efficiently, with an oversized oil sump to manage the heat of continuous operation.
📒 Field Engineer’s Log: The “Broken Belts”
“August 2025, Londrina, PR. A corn farmer complained that his flail mower was eating V-belts every week. He suspected the pulleys were misaligned.”
“We inspected the gearbox (competitor brand). The output shaft bearing had failed, causing the shaft to wobble under load. The bearing was undersized for the belt tension.
解決策: FM-80 Heavy Duty Gearbox. This unit features a reinforced output nose with a double-row tapered roller bearing specifically designed for high radial loads. We also aligned the pulleys using a laser tool. The farmer finished the season on the same set of belts, and the gearbox ran cool.”
よくある質問（OEM/B2B）
1. Can I use this gearbox for a rotary cutter?
Technically yes, but it’s not ideal. Flail gearboxes are usually speed increasers (Output > Input), while rotary cutters need speed reducers (Output < Input). Also, the output shaft is keyed for a pulley, not splined for a blade hub. Check your ratio requirements first.
2. What oil is recommended?
おすすめ SAE 85W-140 ギアオイル. The higher viscosity helps cushion the gears against shock loads and maintains a film under high operating temperatures common in mulching applications.
3. Does the free wheel require maintenance?
The internal free wheel is lubricated by the gearbox oil, so it is generally maintenance-free. However, if you hear clicking or if the rotor doesn’t coast freely, it may indicate oil contamination or sprag wear. Regular oil changes are key.
4. Can I reverse the rotation?
Most flail gearboxes with internal free wheels are Unidirectional. The free wheel only engages in one direction. You must specify the input rotation (usually CW) and desired output rotation when ordering.
Safety and Power Combined
Equip your flail mowers with EVER-POWER Gearboxes for vibration-free, safe operation.
© 2026 EVER-POWER Transmission. All Rights Reserved.
Major Markets: Brazil, Italy, France, Germany, USA.
