Multi-Stage Variable Speed Transmission Units for Combine Harvester Drums and Separators.
Driving the Core of the Combine
In the complex anatomy of a modern combine harvester, the separation of grain from the stalk is the primary objective. This process, known as threshing, requires a massive rotating cylinder (drum) or rotor to impact the crop against a concave grate. The mechanism responsible for delivering the high-torque, variable-speed power to this critical component is the Threshing Gearbox (Caixa de Engrenagens de Debulha). This is not merely a power transmission device; it is a torque management system designed to handle the most volatile loads in agriculture.
その Threshing Gearbox typically sits on the side of the harvester chassis, receiving power from the engine’s main drive belt. Its primary function is to provide selectable speed ranges (e.g., High for wheat, Low for corn) while amplifying torque to prevent the cylinder from stalling when a “slug” of damp crop enters the feeder house. Advanced models integrate with variable speed belt drives (CVTs) or hydrostatic motors to offer infinite speed adjustment on the fly, allowing the operator to fine-tune the threshing aggressiveness based on crop moisture and yield.
エバーパワーの TG-Series (Threshing Gear) units are engineered for the extreme inertia and shock loads inherent in harvesting. Constructed with heavy-duty ductile iron housings and precision-ground helical gears, these gearboxes provide the backbone for high-capacity tangential and axial-flow combines. Whether harvesting rice in Asia or soybeans in the Americas, the reliability of the threshing drive determines the daily productivity of the machine.
Technical Specifications: TG-Series (Separator Drive)
| パラメータ | 仕様 | パラメータ | 仕様 |
|---|---|---|---|
| 入力電力定格 | 200 HP – 500 HP (150-370 kW) | Output Speed Range | 250 – 1200 RPM (Variable) |
| Gear Ranges | 2-Speed (Hi/Lo) Mechanical | 最大出力トルク | 4,500 Nm – 7,000 Nm |
| ハウジング材質 | ダクタイル鋳鉄 QT600-3 | シフト機構 | Hydraulic / Electric Actuator |
| ギアタイプ | Helical (Case Hardened & Ground) | 入力接続 | Driven Pulley (Multi-Groove) |
| 出力軸 | Splined Hub / Flange | ベアリング | High-Capacity Spherical Roller |
| 潤滑 | Forced Feed (Pump) + Splash | 冷却 | Integrated Fins / Oil Cooler Loop |
| シーリング | FKM (Viton) Cassette Seals | オイル容量 | 5.0 Liters – 10.0 Liters |
| Clutch Interface | Electro-Magnetic or Wet Disc | 重さ | 120 kg – 250 kg |
| Ratio (Low) | 3:1 (For Corn/Beans) | Ratio (High) | 1:1 (For Wheat/Canola) |
| 取り付け | Side Chassis Frame | 保証 | 24 Months / 2000 Hours |
| ペイント | High-Temp Epoxy | 互換性 | JD S-Series / Claas Lexion / Case IH |
| Monitoring | Temp & Speed Sensor Ports | 応用 | Threshing Cylinder / Rotor |
Engineering the “Slug” Defense
1. High Inertia Management
A threshing cylinder acts as a flywheel. When engaged, it stores immense kinetic energy. However, when crop conditions are tough (e.g., green-stem soybeans), the load can spike instantly, threatening to stall the drum. Our Threshing Gearbox is designed with high-contact-ratio helical gears that distribute this shock load across multiple teeth simultaneously. This prevents tooth shearing during sudden deceleration events, ensuring the drive continues to power through the blockage rather than failing.
2. Dual-Range Capability
Different crops require vastly different cylinder speeds. Corn requires slow, high-torque rotation (300 RPM) to avoid cracking kernels. Wheat requires high-speed action (1000 RPM) for separation. A single belt drive cannot efficiently cover this range. Our 2-Speed Gearbox provides a mechanical solution: “Low Range” multiplies torque for corn, while “High Range” offers direct drive speed for small grains. This mechanical advantage allows the upstream belt variator to operate in its most efficient mid-range at all times.
3. Belt Tension Support
The input shaft of the threshing gearbox carries the main drive pulley, which is under tremendous belt tension (often exceeding 1 ton of side load). Standard bearings would deflect, causing seal failure. EVER-POWER utilizes Oversized Spherical Roller Bearings on the input shaft supported by a reinforced “snout” housing. This robust design absorbs the radial belt load, keeping the internal shafts perfectly aligned and the seals tight.
4. Reverser Integration
When a combine plugs, the operator must reverse the feeder house and threshing cylinder to clear the blockage. The gearbox must withstand full torque in reverse rotation. Our gear profiles are designed for bi-directional strength, and the lubrication system includes check valves to ensure oil flow is maintained to critical bearings even when the gearbox is spun backward during a unplugging cycle.
Comparative Analysis: Gearbox vs. Hydrostatic vs. Belt Only
| 特徴 | 2-Speed Gearbox Drive (TG Series) | Variable Belt Drive Only | Hydrostatic Direct Drive |
|---|---|---|---|
| トルク容量 | Very High (Mechanical) | Limited (Belt slip) | Medium (Pressure limited) |
| 効率 | 高 (96-98%) | Medium (90-94%) | Low (75-85% Heat loss) |
| Speed Range | Wide (Dual Range) | Limited Ratio | Infinite (0-Max) |
| メンテナンス | 低（オイル交換） | High (Belt/Sheave wear) | 高（液体/フィルター） |
| 料金 | 中くらい | 低い | 非常に高い |
*The 2-Speed Gearbox remains the industry standard for high-capacity combines due to its torque density.
ローカライズされたアプリケーション: グローバル農業
Rice Harvest (Asia/USA)
Rice straw is tough and abrasive (“roping”). It places maximum stress on the threshing drive. Our Heavy-Duty Cast Iron gearboxes are preferred in Arkansas and China for their rigidity. The housing does not flex under the extreme torque loads of roped rice straw, maintaining gear alignment and preventing bearing failure.
Corn Harvest (Brazil/Midwest)
Corn harvest requires low cylinder speeds to prevent kernel damage. Our gearboxes feature a robust Reduction Gear (Low Range) that multiplies torque while slowing the drum. This allows the combine to process high-moisture corn at high ground speeds without the drum stalling or the engine bogging down.
📒 Field Engineer’s Log: The “Stalled” Drum
“October 2025, Iowa Corn Harvest. A farmer with a rotary combine kept plugging the rotor in green-stem corn. The belt was slipping and smoking.”
“The combine had a single-speed belt drive. He was trying to run the rotor slow (to avoid bean damage) but the belt didn’t have enough grip at the low sheave setting.
Solution: We retrofitted the drive with our TG-200 Two-Speed Gearbox. We shifted it into Low Range. This mechanically reduced the speed while doubling the torque. The belt could now run in a higher, more efficient position on the sheaves. The combine powered through the green stems without plugging once, and the grain sample was cleaner than ever.”
よくある質問（OEM/B2B）
1. Can I shift gears while the separator is running?
No! Most agricultural gearboxes utilize non-synchronized mechanical shifters (dog clutches). You must disengage the separator clutch and wait for the drum to stop spinning before shifting ranges. Attempting to shift under load will grind the gears and bend the shift fork.
2. What oil is best for high-temp operation?
Threshing gearboxes run hot due to proximity to the engine and dust insulation. We recommend a Full Synthetic ISO VG 220 or 75W-140 Gear Oil. Synthetic oil maintains film strength at high temperatures (up to 120°C) better than mineral oil, protecting the gears.
3. Is this compatible with John Deere S-Series?
Yes. Our TG-Series includes models specifically designed to replace or upgrade the rotor drives on John Deere STS, Case IH Axial-Flow, and Claas Lexion combines. We match the spline inputs and mounting bolt patterns for a direct fit.
4. How do I detect bearing failure?
Listen for a low growling noise that changes pitch with RPM. Check for oil leaks at the input seal; shaft deflection from a worn bearing often ruins the seal first. Infrared thermometers are useful for spotting a bearing cap running hotter than the rest of the housing.
Harvest at Full Throttle
Upgrade your combine’s core with EVER-POWER Threshing Gearboxes for non-stop performance.
© 2026 EVER-POWER Transmission. All Rights Reserved.
Major Markets: North America, Europe, Brazil, Argentina, Russia.
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