Ever Power Transmission · Agricultural Gearbox Series
Редуктор для комбайна по уборке сахарного тростника: прецизионный привод синхронизации, обеспечивающий бесперебойную работу вашего урожая.
High-torque synchronised chopper gearboxes engineered for the brutal demands of continuous sugarcane harvesting — built to outlast the season, season after season.
When a sugarcane harvester is pushing through dense tropical rows at full capacity, the chopper gearbox — also known as the timing gearbox — is under a level of mechanical stress that would destroy a lesser component within days. Positioned directly at the cutting drum assembly, this gearbox must synchronise two counter-rotating chopper blades with absolute precision, maintain torque consistency despite sudden crop loading changes, and do all of this across a harvesting season that can stretch beyond 5,000 operating hours without a meaningful service window. At Ever Power, we have spent more than 18 years designing, manufacturing, and refining chopper gearboxes that meet exactly those demands — supplying agricultural machinery manufacturers, dealers, and field operators across the UK and internationally with drivetrain components that hold up where it matters most.
The chopper gearbox is categorically the most precision-dependent gearbox in the entire sugarcane harvesting system. Unlike a base cutter gearbox or a feed roller gearbox, the timing gearbox must maintain exact phase synchronisation between both chopper drums at all times. Any deviation — even a fraction of a degree — causes blade collision, catastrophic gearbox failure, and costly machine downtime right in the middle of a harvest window. This document covers everything a UK-based machinery buyer, OEM engineer, or agricultural contractor needs to know before specifying or sourcing a replacement or OEM chopper gearbox.
How the Chopper Gearbox Works — and Why It Must Be Perfect
Inside a sugarcane harvester, the chopper assembly receives long, continuous stalks from the feed rollers and reduces them to uniform billet lengths — typically 250 mm to 300 mm — that can be blown into the haulage trailer. Two counter-rotating drums, each carrying two to four hardened chopper blades, must meet at a precise angular relationship every single revolution. The chopper gearbox drives and synchronises these two drums through a set of helical or straight-cut timing gears, ensuring that the blades pass each other with a clearance measured in tenths of a millimetre rather than millimetres. The energy involved is substantial: at 900–1,200 RPM input from the PTO shaft and with sugarcane stalks averaging 25–40 mm in diameter, instantaneous torque spikes during cutting events can reach three to four times the steady-state design load.
Ever Power chopper gearboxes are manufactured using a combination of case-hardened alloy steel gears (typically 20CrMnTi or equivalent) ground to DIN 6 or better accuracy, a spheroidal graphite cast iron (SG iron / ductile iron) housing that delivers both rigidity and vibration damping, and premium SKF or NSK taper roller bearing assemblies that handle both radial and axial loads simultaneously. Oil seals are double-lip NBR or FKM compound selected based on the specific operating temperature range declared at order. Every housing is pressure-tested before assembly, and finished gear sets are 100% CMM-inspected for tooth profile, lead, and pitch accuracy prior to dispatch.
| Компонент | Материал | Treatment / Standard |
|---|---|---|
| Timing Gears | Легированная сталь 20CrMnTi | Case hardened, ground to DIN 6 |
| Жилье | SG Ductile Iron GGG50 | Pressure-tested, shot-blasted |
| Подшипники | Taper Roller (SKF / NSK) | ISO 355, pre-adjusted axial play |
| Сальники | Double-lip NBR / FKM | Selected by operating temp. |
| Валы | Легированная сталь 42CrMo4 | Induction hardened journals |
| Surface Finish | Эпоксидная грунтовка + полиуретановое финишное покрытие | ISO 12944 C3 corrosion class |
Технические характеристики
The table below reflects our standard range. Custom ratios, mounting flanges, and shaft configurations are available on request — see the factory capabilities section below.
| Параметр | Стандартный диапазон | Примечания |
|---|---|---|
| Входная скорость | 540 – 1000 об/мин | PTO-driven via driveshaft |
| Выходная скорость | 900 – 1,200 RPM | Stepped up via internal ratio |
| Передаточное число | 1:1.8 to 1:2.2 | Доступны индивидуальные соотношения. |
| Номинальный входной крутящий момент | Up to 1,800 N·m | Непрерывная шкала |
| Максимальный крутящий момент удара | Up to 5,400 N·m | 3x safety factor on gears |
| Точность синхронизации | +/- 0.05 deg phase error | CMM verified per unit |
| Смазка | Splash oil bath (EP 220) | Forced lube option available |
| Рабочая температура. | -10 °C to +60 °C | Tropical variants to +70 °C |
| Интерфейс крепления | Flange or foot mount | Custom flanges accepted |
| Weight (typical) | 48 – 85 kg | Size-dependent |
| Степень защиты IP | IP65 | Dust and jet-water resistant |
Why UK Machinery Buyers Choose Ever Power Chopper Gearboxes
Zero-Tolerance Timing Accuracy
Every chopper gearbox leaves the factory with a CMM-verified phase error below 0.05 degrees. Blade clearance integrity is guaranteed — not estimated.
Shock-Resistant Gear Train
Ground helical gears with a 3x torque safety factor handle the violent load spikes that occur every time the chopper blades strike a dense stalk bundle, extending service life dramatically compared to standard commercial gearboxes.
Tropical Climate Ready
FKM seals, EP 220 oil bath lubrication, and an optional +70 °C thermal specification ensure reliable operation in the high-humidity tropical and sub-tropical environments where sugarcane is commercially grown.
Direct OEM Interchange
Our standard range is dimensionally interchangeable with major harvester platforms. Replacement can be completed without machine modification, minimising field downtime to under 90 minutes in most cases.
Full Drivetrain Supply with PTO Shafts
Ever Power supplies matched PTO shafts alongside every chopper gearbox — because the relationship between PTO shaft geometry, universal joint angularity, and gearbox input bearing load has a direct and measurable effect on both chopper timing stability and overall gearbox service life.
Custom Engineering Capability
Non-standard ratios, bespoke shaft interfaces, and modified housing geometries are all handled in-house. MOQs for custom chopper gearboxes start from a single unit for prototyping, with full production batches from 50 units.
PTO Shafts and Chopper Gearboxes: Why They Must Be Matched
A chopper gearbox does not operate in isolation. Power flows to it through a PTO shaft — a cardan driveshaft carrying a pair of universal joints — and the angular relationship, shaft length, and cross-joint phasing of that PTO shaft directly determine the torsional vibration profile arriving at the gearbox input flange. If the PTO shaft is undersized, incorrectly phased, or worn beyond tolerance, the result is a cyclic torque fluctuation superimposed on the steady-state input load. At 1,000 RPM, even a modest 8% torque oscillation can accelerate input bearing fatigue by a factor of three or more.
Ever Power supplies CE-marked PTO shafts in both standard and custom lengths, rated from 500 N·m to 3,000 N·m, with profile tube options in triangular, lemon, and star cross-sections. All PTO shafts supplied with our chopper gearboxes are factory-phased to zero degrees, meaning the U-joints are assembled in the correct homokinetic orientation for minimum velocity fluctuation. This is not a detail that every supplier addresses — but it is one that our application engineers consider non-negotiable for timing-critical chopper applications.
PTO Shaft Supply Highlights
- Torque ratings: 500 – 3,000 N·m
- CE-marked to EN 12965
- Homokinetic (zero-phase) assembly
- Wide-angle joints available (80° operating angle)
- Custom lengths and tube profiles
- Overrunning clutch and shear bolt options
- Matched and shipped with gearbox as a kit
Application Scenarios for the Chopper Gearbox
The chopper gearbox in a sugarcane harvester operates across a wider range of real-world conditions than many OEM engineers initially account for. Understanding these scenarios is essential for correct specification and helps explain why material and geometric choices that work for a dry, light-crop harvest may fail within a single season in a different environment.
🌾 Commercial Sugarcane Harvest (Brazil / Australia model)
High-throughput mechanical harvesting of green cane, 8–12 hours per day, 90–150 day campaigns. Gearbox must handle continuous rated load with minimal service access.
🔄 OEM Manufacturing Integration
UK and European agricultural machinery OEMs specifying chopper gearboxes for new-build harvesters or harvester attachments. Requires certified documentation, dimensional compliance, and repeatable quality across production batches.
🛠 Aftermarket Replacement (UK Dealers)
Agricultural machinery dealers and contractors across England, Scotland, and Wales requiring direct-fit replacement units for aged or damaged chopper gearboxes. Fast-ship stock options and full technical support.
🌍 Export to Tropical Markets via UK Agents
UK-based trading companies and agricultural importers sourcing chopper gearboxes for markets in Africa, South Asia, and the Caribbean. CE marking, container-optimised packaging, and full export documentation available.
Производственные возможности и услуги по разработке индивидуальных инженерных решений.
Ever Power operates a purpose-built gearbox manufacturing facility equipped with CNC gear hobbing and grinding centres, a CMM quality laboratory, a dedicated assembly and test bay, and a heat treatment line capable of processing both batch and single-piece hardening work. This integrated facility means that every stage of chopper gearbox production — from raw material receipt through to final run-in testing — is controlled under one quality management system certified to ISO 9001:2015. The production team includes degreed mechanical engineers and experienced gearbox assembly technicians who understand the difference between a gearbox built to nominal print dimensions and one set up to perform in the field.
Our product customisation service is genuinely comprehensive. If your harvester design requires a non-standard output shaft diameter, a modified housing footprint, a specific gear ratio not available in the catalogue, a different input interface, or a gearbox that combines the chopper timing function with an additional output drive to a belt elevator, our engineering team can develop and manufacture that unit. We have delivered bespoke chopper gearbox solutions for machinery manufacturers in the UK, the Netherlands, Australia, Brazil, and South Africa, with lead times for custom prototypes typically in the range of 6–8 weeks from approved drawing.
Custom Order Capabilities at a Glance
Non-standard shaft interfaces
Modified housing geometry
Combined output functions
OEM branding and labelling
Prototype from 1 unit
Production MOQ from 50 units
CE / ISO documentation
Customer Success: How a Brazilian Harvester OEM Cut Warranty Claims by 60%
Case Study — São Paulo, Brazil · Agricultural Machinery OEM
Harvester Tech Brasil — Custom Chopper Gearbox for Self-Propelled Cane Harvester
Harvester Tech Brasil, a mid-sized agricultural machinery manufacturer based in the Piracicaba region of São Paulo state, had been experiencing a persistent 14% field warranty rate on the редуктор чоппера assembly across their flagship self-propelled sugarcane harvester. The failures were predominantly premature bearing seizure at the input stage and phase drift developing within the first 500 hours on approximately one unit in ten. Their engineering team suspected the root cause was a combination of mismatched bearing preload in the OEM specification and torsional vibration amplification introduced by an incorrectly phased PTO shaft.
Ever Power’s application engineering team conducted a full drivetrain review based on the harvester’s operating data, working backwards from the failure mode analysis to identify that the original gearbox had been specified with a C3 bearing clearance class — suitable for high-speed electric motor applications but actually detrimental in a slow-speed, high-shock agricultural gearbox where a tighter C2 fit would significantly improve bearing stability under transient shock loads. Simultaneously, the PTO shaft supplied to the original design was assembled in a 90-degree cross-phase configuration rather than the correct zero-degree homokinetic arrangement, introducing a 2x per revolution torque oscillation that was measurably accelerating input bearing fatigue.
Ever Power supplied a redesigned chopper gearbox with C2 bearing fits, revised housing ribbing for improved stiffness, a matched homokinetic PTO shaft kit, and a detailed installation and commissioning manual. Within 18 months of the revised specification entering production, Harvester Tech Brasil’s chopper gearbox warranty claim rate had fallen from 14% to below 5.5% — a reduction of over 60%. The client subsequently extended the supply agreement to cover the complete range of their harvester gearboxes, including base cutter and fan drive units.
“We had been through three different suppliers for our chopper gearbox in five seasons. Ever Power’s unit is now in its third full harvest without any unscheduled downtime. The phase accuracy is consistently right, which is the one thing that the others kept getting wrong.”
— Technical Director, Cane Machinery Solutions Ltd, Kent, UK
“The matched PTO shaft and chopper gearbox kit made the installation straightforward and I know the phasing is correct. For an aftermarket replacement, the dimensional fit on our harvester was essentially perfect. Ever Power’s support team answered every technical question we had before we committed to the order.”
— Workshop Manager, Midland Agri Parts, Lincolnshire, UK
“We source chopper gearboxes for distribution to our clients in West Africa and the Caribbean. Ever Power handles all the export documentation, CE compliance paperwork, and container packing with zero issues. Lead times are reliable and the quality is consistent batch to batch — which is more than we can say for the alternatives we tried.”
— Director, Tropical Agri Exports Ltd, Bristol, UK
Часто задаваемые вопросы
Ready to Specify or Source Your Chopper Gearbox?
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© Ever Power Transmission Technology Co., Ltd. · Chopper Gearbox for Sugarcane Harvester · edit by gzl
