The Essential Tool for “Agricultura Familiar”
Brazil is a superpower in global agriculture, but behind the massive soy combines of Mato Grosso lies a vibrant sector of smallholder family farms (“Agricultura Familiar”). In regions like the “Cinturão Verde” (Green Belt) of São Paulo and the tobacco hills of Southern Brazil, the primary workhorse is not a giant tractor, but the humble Power Tiller (Microtrator / Motocultivador). The defining implement for these machines is the Rear Rotary Tiller Attachment (Enxada Rotativa Traseira).
その Tillage Attachment Gearbox is the mechanical heart that makes this soil preparation possible. Bolted to the rear of the walking tractor chassis, this gearbox performs a complex task: it accepts the horizontal PTO input, turns the power 90 degrees, and steps down the speed to drive the tine shaft. This action pulverizes the soil, incorporates crop residue, and prepares a perfect seedbed in a single pass.
However, Brazilian soil conditions are unforgiving. From the abrasive sandy soils of the Northeast to the heavy, sticky red clays of the South, the Rotavator Gearbox faces extreme torque loads, dust ingestion, and impact from rocks. EVER-POWER’s TG-Series (Tillage Gearbox) is engineered specifically for these tropical challenges, featuring dual-stage sealing, reinforced cast iron housings, and premium alloy steel gears to ensure reliability season after season.
Technical Specifications: TG-Series (Rotary Tiller)
| パラメータ | 仕様 | パラメータ | 仕様 |
|---|---|---|---|
| 入力電力 | 8 HP – 18 HP (Diesel Engine) | 減速比 | 1:1.5 to 1:3 (Configurable) |
| 入力速度 | 540 / 720 / 900 RPM (PTO) | ローター速度 | 180 – 320 RPM |
| ハウジング材質 | ダクタイル鋳鉄QT450（耐衝撃性） | 最大出力トルク | 450 Nm |
| 入力シャフト | Splined (PTO Standard) / Pulley | 出力接続 | Center Drive or Side Chain Drop |
| ギアタイプ | Spiral Bevel / Helical | ギア素材 | 20CrMnTiH（浸炭処理済み、硬度60HRC） |
| ベアリングタイプ | Tapered Roller / Deep Groove | 取り付けインターフェース | 4-Bolt Rear Hitch Flange |
| シーリングシステム | Cassette Seal (Mud & Rice) | 潤滑 | Oil Bath (SAE 90 / 140) |
| オイル容量 | 1.2リットル～2.5リットル | Tilling Width | 60cm – 120cm |
| クラッチシステム | Optional (Dog Clutch for Gear Shift) | Side Drive | Chain (ASA 80) or Gear Train |
| 重量（乾燥時） | 25kg～55kg | チェーンテンショナー | Auto-Spring or Manual Cam |
| ペイント | Epoxy Red / Blue / Green | 保証 | 12ヶ月 |
| 互換性 | Yanmar / Tobata / Tramontini | 応用 | Dry Land / Wet Paddy (Várzea) |
Engineering the “Compact Powerhouse”
1. The Central vs. Side Drive Debate
Tillage attachments generally come in two drivetrain configurations.
A) Center Drive: The gearbox sits in the middle of the rotor. This is robust but leaves an un-tilled strip of soil under the gearbox.
B) Side Drive (Lateral): The gearbox sits on top and drives a chain or gear drop-box on the side. This allows for full-width tilling coverage. EVER-POWER offers both, but for high-value vegetable crops, our Side-Chain Drive Gearbox is preferred for its clean finish and soil uniformity.
2. Gear Shifting Capabilities
Different soils require different rotor speeds. Sandy soil needs high speed for pulverization; clay needs low speed for torque. Our advanced TG-Series gearboxes feature a 2-Speed Lever Shift Mechanism. By engaging different internal gear sets (Hi/Low), the operator can switch rotor speeds (e.g., 220 RPM vs 300 RPM) instantly without changing pulleys or sprockets, maximizing versatility for multi-crop farms.
3. Wet Paddy Sealing (Arroz de Várzea)
In Southern Brazil, power tillers work submerged in rice paddies (“Lama”). Water ingress is the #1 killer of gearboxes. We utilize a specialized カセットシール on the lower output shafts. This seal incorporates an internal grease labyrinth and multiple sealing lips running on a unitary wear sleeve. It acts as a complete barrier to mud and water, ensuring the chain or gears run in clean oil even when the housing is underwater.
4. Overload Impact Protection
When tines hit a buried rock, the shock load transmits instantly to the gearbox. To prevent catastrophic gear tooth failure, we integrate a スリップクラッチ or a Shear Bolt yoke at the PTO input. Additionally, for chain-drive models, the chain itself offers a degree of elasticity that dampens peak shock loads, protecting the more expensive spiral bevel gears in the upper housing.
Comparative Analysis: Cast Iron vs. Aluminum Housing
| 特徴 | Cast Iron (EVER-POWER Standard) | Aluminum (Light Duty) |
|---|---|---|
| 強さ | High (Resists bending/cracking) | Low (Prone to stress cracks) |
| 振動減衰 | Excellent (Absorbs shock) | Poor (Transmits noise) |
| Thread Hold | Excellent (Steel bolts hold firm) | Poor (Threads strip easily) |
| 重さ | Heavier (Adds traction weight) | Lighter |
| Corrosion | Good (With paint) | Excellent (Natural) |
*Based on durability tests in abrasive laterite soils of Minas Gerais.
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
Vegetable Farming (Green Belt)
For lettuce and strawberry beds, soil finish must be powder-fine. Farmers use our High-Ratio (1:3) Gearboxes to spin the rotor at max speed (320 RPM). This aggressive action breaks every clod, creating the perfect tilth for seed germination or transplanting, crucial for the high-value markets of São Paulo.
Tobacco & Coffee (Slopes)
On steep slopes, machine balance is vital. Our Compact Side-Drive design keeps the center of gravity low and centered. The heavy cast iron housing adds necessary weight to the rear of the tiller, improving traction for the walking tractor tires on slippery, clay-rich inclines.
📒 Field Engineer’s Log: The “Grinding” Noise
“October 2025, Santa Cruz do Sul, RS. A tobacco farmer complained about a grinding noise in his rotavator chain case. He had tightened the manual tensioner as much as possible.”
“The chain was overtightened, stretching the links and bowing the side case walls. The lack of proper lubrication had caused the chain rollers to seize.
解決策: TG-40 Gearbox with Auto-Tensioner. This spring-loaded nylon shoe applies just the right amount of pressure to the slack side of the chain, absorbing shock without over-stressing the bearings. We also filled the case with Semi-Fluid Grease (NLGI 00) which clings to the chain better than oil. The unit ran whisper-quiet and cool.”
よくある質問（OEM/B2B）
1. Is this compatible with Tobata/Yanmar tillers?
Yes. Our TG-Series features a standardized mounting flange pattern that matches the rear hitch of most popular walking tractors (Tobata, Yanmar, Tramontini). We offer different input spline adapters (e.g., 18mm, 20mm, PTO 6-spline) to ensure a perfect fit.
2. Gear Drive vs. Chain Drive: Which is better?
Chain Drive is lighter, cheaper, and absorbs shock better (good for rocky soil). Gear Drive (Side Gears) is heavier, more expensive, but virtually maintenance-free and stronger (good for heavy clay/commercial use). We manufacture both.
3. Can I change the rotor speed?
Yes. If you choose our Multi-Speed Gearbox model, you can shift between High and Low speeds via a lever. Alternatively, on Chain Drive models, you can swap the input/output sprockets inside the chain case to change the ratio permanently.
4. What maintenance is required?
Check oil levels in the top gearbox and side chain case every 50 hours. Grease the rotor bearings daily. Replace the oil annually or after 500 hours. Keep the breather plug clean to prevent seal blow-out.
Reliability for the Small Farmer
Empower your power tillers with EVER-POWER Tillage Gearboxes. Built tough for Brazil.
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Major Markets: Brazil, Vietnam, Thailand, India, Indonesia.
