Description
EP-NRV050 — Shaft-Input Heavy-Duty Aluminium Worm Gear Reducer
The EP-NRV050 is the shaft-input sibling of the NMRV050, delivering the same 4,280 N·m maximum output torque and 1.1 kW input power rating in the same die-cast aluminium housing, but configured with a solid keyed input shaft in place of a bore-input IEC flange. This makes the NRV050 the definitive choice for applications where power arrives via chain, belt, or direct coupling from a non-IEC source — PTO-driven agricultural machinery, hydraulic motor outputs, engine-driven equipment, and custom industrial machinery where the drive geometry places the power source away from the IEC motor position. In Australian agriculture, the NRV050 powers grain-dryer fan conveyor drives, heavy auger systems, and irrigation pump speed reducers connected to engine or electric motor outputs via roller chain. In industrial settings, it finds application in central-line-shaft factory layouts, batch conveyor drives for food and chemical processing, and specialist OEM machinery. The NRV050’s 25 mm output bore, IP54 protection, and six mounting positions deliver the same heavy-duty performance envelope as the NMRV050, ensuring no compromise on output capability despite the different input configuration.
Technical Specifications — EP-NRV050
| Parameter | Value |
|---|---|
| Series | NRV (Solid Shaft Input, No Input Flange) |
| Centre Distance | 50 mm |
| Reduction Ratios | 5, 7.5, 10, 15, 20, 25, 30, 40, 50, 60, 80, 100 |
| Rated Input Power | Up to 1.1 kW |
| Output Speed Range | 14 to 280 r/min (at 1400 r/min input) |
| Max Output Torque | 4,280 N·m |
| Input Type | Solid shaft input, no IEC flange |
| Housing Material | Die-cast aluminium alloy |
| Worm Wheel Material | Phosphor bronze |
| Worm Shaft Material | 20CrMnTi alloy steel, case hardened, ground |
| Output Bore Diameter | 25 mm standard (H7 with keyway) |
| Lubrication | ISO VG 220 gear oil (factory filled) |
| Mounting Positions | B3, B6, B7, B8, V5, V6 |
| Protection Class | IP54 |
| Ambient Temperature | -10°C to +40°C |
NRV050 Performance Table (1.1 kW / 1400 r/min)
| Ratio (i) | Output Speed (r/min) | Output Torque (N·m) | Service Factor (fs) |
|---|---|---|---|
| 7.5 | 187 | 683 | 2.3 |
| 10 | 140 | 752 | 1.8 |
| 15 | 93 | 861 | 1.3 |
| 20 | 70 | 948 | 1.0 |
| 30 | 47 | 1,085 | 1.0 |
| 40 | 35 | 2,475 | 2.1 |
| 50 | 28 | 2,865 | 2.3 |
| 60 | 23 | 3,153 | 1.7 |
| 80 | 18 | 3,610 | 1.6 |
| 100 | 14 | 4,280 | 1.4 |
✅ NRV050 Key Features
🔗 Shaft Input for PTO & Engine Drives
The NRV050’s solid keyed input shaft connects directly to PTO drive chains, engine countershafts, and hydraulic motor outputs that cannot present an IEC flange face, expanding the applicable drive train configurations beyond what any flange-input gearbox can serve.
📈 4,280 N·m Heavy-Duty Output
Identical to the NMRV050, the NRV050 reaches 4,280 N·m at ratio 100, confirming that the shaft input arrangement does not compromise output torque capacity at any ratio.
⛁ Agricultural-Grade Durability
The die-cast aluminium housing withstands Australian seasonal extremes: hot, dry summer harvest conditions, cold winter irrigation periods, and the mechanical vibration of engine-driven equipment, all without the corrosion that affects cast-iron housings.
◯ 25 mm Output Bore — Standard Heavy Interface
The 25 mm H7 hollow output bore and matching DZ solid shaft deliver reliable power transfer to driven shafts across all agricultural and industrial applications without machined adaptors.
🅆 Thermal Stability Under Belt & Chain Load
Belt and chain drives often generate higher radial loads than direct-coupled IEC motors. The NRV050’s finned aluminium housing manages the combined thermal load from worm gear losses and input shaft bearing friction at sustained 1.1 kW input.
🏭 Application Scenarios
🌿 Agricultural Conveyor Drives
Heavy-duty shaft-input worm gear reducer for grain-dryer fan conveyor chain drives, heavy auger systems, and silage conveyor drives powered by PTO shaft or engine countershaft chain.
💧 Irrigation Pump Speed Reduction
Compact worm gear reduction gearbox for irrigation pump speed reducers belt-driven from diesel engines or electric motors without an IEC shaft extension, common on Australian farms.
⚙ Industrial Food Processing
Corrosion-resistant aluminium worm gearmotor alternative for food-plant batch conveyors and mixing system drives where chain drives from central line shafts are the established layout.
🚢 Engineered Machinery OEM
Shaft-input worm gear reducer for custom OEM machinery builders — concrete mixing drum drives, agricultural spreader mechanisms, and specialist harvest equipment with non-standard power transmission architectures.
🔎 Comparing NRV050 vs NMRV050
| Feature | EP-NMRV050 | EP-NRV050 |
|---|---|---|
| Input Configuration | Bore input with IEC flange (63B5 to 80B14) | Solid shaft input, no flange |
| Best Motor Connection | Direct IEC face-mount motor | Chain, belt, coupling, or PTO |
| Max Input Power | 1.1 kW | 1.1 kW |
| Max Output Torque | 4,280 N·m | 4,280 N·m |
| Output Bore | 25 mm H7 | 25 mm H7 |
| Physical Dimensions | Identical housing | Identical housing |
NRV050 DZ/SZ Output Shaft Dimensions
| G1 (mm) | K1 (mm) | L/DZ (mm) | L1/SZ (mm) | b2 (mm) | d h6 (mm) | Keyway |
|---|---|---|---|---|---|---|
| 92 | 99.5 | 153 | 199 | 8 | 25 | M10 |
❓ FAQs — EP-NRV050
What is the input shaft specification for the NRV050?
The NRV050 input shaft is a solid keyed shaft with a 19 mm h6 diameter and a standard key, matching the IEC 80 motor output shaft diameter for compatibility with standard sprockets and pulleys sized for IEC 80 frame motors. The shaft protrudes from both faces of the housing unless a single-end configuration is specified.
What is the maximum allowable overhung load on the NRV050 input shaft?
Fr max for the NRV050 input shaft is 3,490 N at the shaft mid-point for the lower-ratio range. This is substantially higher than for the NRV030 and NRV040, reflecting the larger shaft diameter and bearing arrangement. For chain drives, calculate the resultant chain tension and confirm it does not exceed Fr max.
Can the NRV050 be driven by a hydraulic motor?
Yes. The NRV050 solid input shaft accommodates a hydraulic motor with a standard keyed shaft output via a rigid or flexible coupling. Ensure the coupling type handles any misalignment and does not impose excessive axial load on the NRV050 input shaft bearings.
Is the NRV050 self-locking at high reduction ratios?
At ratios 30:1 and above, the NRV050 exhibits static self-locking characteristics (static efficiency below 0.5). This is useful for vertical conveyor or inclined load-holding applications where the output load must not backdrive the input shaft when power is removed.
What output shaft options are available for the NRV050?
The NRV050 standard output is a hollow bore (25 mm H7). Optional DZ single solid shaft (25 mm h6, M10 key), SZ double-ended solid shaft, output flange (F), and hollow output flange (FL) are available. All options are interchangeable during manufacture — specify the required output type when placing your order.
⭐ Customer Reviews
★★★★★
“Our grain-dryer fan conveyor runs an NRV050 at i=30, chain-driven from the dryer’s main drive shaft. It has handled three full harvest seasons — each about 600 hours — in hot, dusty Queensland conditions without a single maintenance issue.”
Peter N. — Farm Operations Manager, Grain Cropping 🇦🇺 Australia (Queensland)
★★★★★
“We use the NRV050 on our irrigation pump reduction drive, belt-driven from a diesel engine. The solid input shaft accepted our standard V-belt pulley perfectly and the gearbox has operated flawlessly through two full irrigation seasons in Western Australian conditions.”
Helen M. — Farm Manager, Horticulture 🇦🇺 Australia (Western Australia)
★★★★☆
“Fitted four NRV050 units to our food-plant batch conveyor line. The chain-input arrangement simplified our existing drive layout and the IP54 aluminium housing handles our daily warm-water cleaning cycle without any corrosion after 14 months.”
Thomas W. — Plant Engineer, Food Ingredients Manufacturer 🇬🇧 UK
⚙ Accessories & Compatible Products
⚡ IEC Motors (B5/B14)
Standard single-phase and three-phase AC motors with matching IEC flange. VFD inverter-duty versions available.
🔗 Output Shaft Kits
Single solid (DZ), double-ended (SZ), output flange (F), hollow flange (FL) — all H7/h6 tolerance with standard keyways.
🔨 Torque Arms
Steel torque reaction arms for shaft-mount configurations; foot-mounting plates for B3/B6 orientations.
🔒 Seal & Breather Kits
Replacement lip-seal kits, vented breather plugs, and magnetic drain plugs for service intervals.
Request a Quote for EP-NRV050
Our team will confirm the input and output shaft specifications for your chain or belt drive arrangement. Custom shaft dimensions available for OEM volume orders.
The EP-NRV050 aluminium worm gear reducer has a 50 mm centre distance, ratios from 5 to 100, rated input power up to 1.1 kW, and maximum output torque of 4,280 N·m. With a solid shaft input design, this heavy-duty shaft-input worm gearbox is optimised for chain and belt-driven agricultural conveyors, industrial mixing systems, and custom OEM machinery where a non-IEC drive source delivers power to the gearbox input shaft.
