Description
EP-NRV040 — Shaft-Input Industrial Aluminium Worm Gear Reducer
The EP-NRV040 aluminium worm gearbox is the shaft-input version of the popular NMRV040, sharing the same 40 mm centre distance, internal gear geometry, and die-cast aluminium housing but presenting a solid keyed input shaft rather than a bore-input IEC flange. This configuration is the natural choice when the drive source is a chain sprocket connected to a gearmotor, engine, or line shaft; a belt pulley driven from a central power source; a hydraulic motor with a shaft output; or any other non-IEC driving arrangement. In Australian agriculture, the NRV040 is commonly used in grain-cleaning machinery, feed-mill conveyor drives, and fodder-processing equipment where PTO-driven chain systems are the established standard. In industrial settings, it drives custom automation stages, reciprocating conveyor drives, and batch-mixing equipment in food and chemical plants where the machine builder’s layout places the power source at a shaft rather than an IEC motor face. With the same 3,118 N·m maximum output torque as the NMRV040, the NRV040 delivers full industrial-grade performance in any drive arrangement.
Technical Specifications — EP-NRV040
| Parameter | Value |
|---|---|
| Series | NRV (Solid Shaft Input, No Input Flange) |
| Centre Distance | 40 mm |
| Reduction Ratios | 5, 7.5, 10, 15, 20, 25, 30, 40, 50, 60, 80, 100 |
| Rated Input Power | Up to 0.55 kW |
| Output Speed Range | 14 to 280 r/min (at 1400 r/min input) |
| Max Output Torque | 3,118 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 | 18–22 mm 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 |
NRV040 Performance Table (0.55 kW / 1400 r/min)
| Ratio (i) | Output Speed (r/min) | Output Torque (N·m) | Service Factor (fs) |
|---|---|---|---|
| 7.5 | 187 | 1,315 | 2.5 |
| 10 | 140 | 1,447 | 1.9 |
| 15 | 93 | 1,657 | 1.3 |
| 20 | 70 | 1,824 | 1.0 |
| 25 | 56 | 1,964 | 0.8 |
| 30 | 47 | 2,087 | 0.9 |
| 40 | 35 | 2,298 | 1.6 |
| 50 | 28 | 2,475 | 1.3 |
| 60 | 23 | 2,630 | 1.3 |
| 80 | 18 | 2,895 | 1.0 |
| 100 | 14 | 3,118 | 1.0 |
✅ Key Advantages of the Shaft-Input Design
🔗 Universal Drive Compatibility
The NRV040 solid keyed input shaft accepts any rotational power source — chain sprockets, V-belt pulleys, flat-belt pulleys, fluid couplings, and direct rigid couplings — without requiring an IEC-standard motor face.
◯ 3,118 N·m — Full Industrial Torque
The NRV040 delivers the same maximum output torque as the NMRV040, confirming that the shaft input arrangement carries no torque penalty versus the flange-input version.
⛁ Corrosion-Resistant for Harsh Environments
Die-cast aluminium housing with electrostatic paint provides lasting protection in the dusty grain-belt conditions of rural Australia, coastal salt-spray environments, and indoor food-plant washdown areas where cast-iron would rust within months.
🅆 VFD-Compatible Worm Gear Mechanism
Like the NMRV040, the NRV040 handles variable-frequency drive operation from 20 Hz upward, useful when a belt-driven VFD motor is used to vary process speed across the reduction ratio.
🔧 Full Mounting Flexibility
Six standard orientations (B3, B6, B7, B8, V5, V6) allow the NRV040 to be mounted in any position that the chain or belt drive geometry demands, without any adaptor plates or custom mounting hardware.
🏭 Application Sectors
🌿 Feed Mills & Grain Handling
Shaft-input worm gear reducer for grain cleaner drives, hammer mill product augers, and elevator bucket conveyors in feed mills driven by chain from a central line shaft or electric motor.
🚮 Industrial Conveyor Drives
Aluminium worm gearbox for belt conveyor tail-end drives, accumulation roller conveyor drives, and inclined conveyor sections where the drive arrangement uses a belt or chain from a motor positioned separately from the gearbox.
⚙ Food & Chemical Processing
Industrial worm gear reduction gearbox for reactor rake drives, mixing paddle conveyor drives, and batch-feed conveyor systems in food processing plants where chain drives are already the established maintenance standard.
📥 Custom OEM Machinery
Compact worm gearmotor alternative for custom OEM machinery builders whose drive arrangements include a shaft output from a gearmotor, hydraulic motor, or engine rather than an IEC flange.
🔎 NRV040 vs NMRV040 — Selection Guide
| Requirement | Recommended Series |
|---|---|
| Direct IEC motor face mounting | NMRV040 (bore input with IEC flange) |
| Chain, belt, or coupling drive source | NRV040 (solid shaft input) |
| Space constraint — gearbox must be remote from motor | NRV040 |
| Standard gearmotor assembly | NMRV040 |
| Custom drive arrangement | NRV040 |
| Output torque requirement | Identical for both series |
NRV040 DZ/SZ Output Shaft Dimensions
| G1 (mm) | K1 (mm) | L/DZ (mm) | L1/SZ (mm) | b2 (mm) | d h6 (mm) | Keyway |
|---|---|---|---|---|---|---|
| 78 | 82 | 128 | 164 | 6 | 18 | M6 |
❓ FAQs — EP-NRV040
What is the input shaft specification for the NRV040?
The NRV040 input shaft is a solid keyed shaft, 14 mm h6 diameter with a standard metric key. The input shaft protrudes from both sides of the housing (bilateral shaft configuration), allowing drive from either end for flexible installation. Confirm the bilateral or single-end shaft requirement when ordering.
What is the maximum overhung load on the NRV040 input shaft?
The maximum allowable radial load on the NRV040 input shaft (Fr max) is 1,830 N, measured at the mid-point of the shaft extension. For chain or belt drives, calculate the actual overhung load from the chain/belt tension and compare against this limit to avoid premature bearing wear.
Can the NRV040 be used as a speed increaser (output drives the input)?
Technically the worm gear will transmit power in reverse at low ratios (i=5–20, efficiency above 0.5) but worm gear efficiency drops rapidly in back-drive mode. For speed-increaser applications, consult our engineering team for a dedicated back-drive analysis.
How does the NRV040 handle chain-drive input radial loading?
The NRV040 input shaft bearings are rated for Fr max = 1,830 N at the mid-shaft point. Mount the chain sprocket as close to the housing face as possible to minimise the bending moment. Use a duplex or triplex chain to reduce tension for equivalent power, further reducing the overhung load.
Is the NRV040 available with a double-ended output shaft (SZ)?
Yes. The SZ double-ended output shaft option is available for the NRV040, providing output shaft extensions on both sides of the housing. This is useful for driving two loads simultaneously or for attaching a position encoder on the secondary output shaft end.
⭐ Customer Reviews
★★★★★
“We use the NRV040 on our feed-mill hammer mill product auger, chain-driven from the mill’s main shaft. The solid input shaft made fitting the chain sprocket straightforward. After three years of continuous daily operation the gearbox shows no wear or leakage.”
Wayne F. — Mill Manager, Stock Feed Producer 🇦🇺 Australia (Queensland)
★★★★★
“The NRV040 drives a batch-feed conveyor in our food ingredients plant via a chain from a gearmotor. The IP54-sealed aluminium housing withstands our daily hot-water cleaning cycle with no corrosion after 18 months.”
Rosa K. — Engineering Manager, Food Ingredients Plant 🇳🇿 New Zealand
★★★★☆
“We installed six NRV040 units on our inclined conveyor drives in our packaging warehouse. The chain input arrangement fitted our existing drive layout perfectly and the output bore accepted our 18 mm conveyor shaft without any modification.”
Jan P. — Maintenance Engineer, Packaging Warehouse 🇨🇿 Czech Republic
⚙ 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.
Order the EP-NRV040 Today
Specify your required ratio, input shaft end configuration, and output shaft type. OEM pricing and custom shaft options available for volume orders.
The EP-NRV040 aluminium worm gear reducer features a 40 mm centre distance, ratios from 5 to 100, rated input power up to 0.55 kW, and maximum output torque of 3,118 N·m. Its solid shaft input design — without an IEC input flange — makes it ideal for chain-driven agricultural equipment, belt-driven industrial machinery, and custom automation systems where the driving source is a shaft rather than an IEC motor flange.
