Description
EP-NRV030 — Shaft-Input Aluminium Worm Gear Speed Reducer
The EP-NRV030 aluminium worm gearbox is the shaft-input counterpart of the NMRV030, sharing the same 30 mm centre distance, identical output torque ratings, and die-cast aluminium housing architecture, but replacing the bore-input IEC flange with a solid shaft input. This key difference makes the NRV030 the preferred solution when the driving source is a chain sprocket, belt pulley, hydraulic motor, hand wheel, or non-standard motor that does not present an IEC flange face. The NRV series is widely used in agricultural machinery — seed drills, irrigation pump drives, and tillage equipment — where a chain from a PTO or engine output shaft connects directly to the NRV input shaft without needing a motor adaptor. It is equally popular in custom automation rigs, marine steering gear, and industrial machinery where layout constraints prevent aligning an IEC motor directly behind the gearbox. Like all NMRV/NRV series units, the NRV030 is built with a precision-ground worm shaft, phosphor-bronze worm wheel, dual-lip oil seals, and die-cast aluminium housing with integrated cooling fins, supporting continuous duty in humid, dusty, and corrosive environments that would rapidly degrade uncoated cast-iron housings.
Technical Specifications — EP-NRV030
| Parameter | Value |
|---|---|
| Series | NRV (Solid Shaft Input, No Input Flange) |
| Centre Distance | 30 mm |
| Reduction Ratios | 5, 7.5, 10, 15, 20, 25, 30, 40, 50, 60, 80, 100 |
| Rated Input Power | Up to 0.18 kW |
| Output Speed Range | 14 to 280 r/min (at 1400 r/min input) |
| Max Output Torque | 1,367 N·m |
| Input Type | Solid shaft (keyed, 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 mm H7 with 5 mm 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 |
NRV030 Performance Table (0.18 kW / 1400 r/min)
| Ratio (i) | Output Speed (r/min) | Output Torque (N·m) | Service Factor (fs) |
|---|---|---|---|
| 7.5 | 187 | 683 | 7.0 |
| 10 | 140 | 752 | 5.4 |
| 15 | 93 | 861 | 3.9 |
| 20 | 70 | 948 | 3.1 |
| 25 | 56 | 1,021 | 3.1 |
| 30 | 47 | 1,085 | 2.5 |
| 40 | 35 | 1,194 | 1.9 |
| 50 | 28 | 1,286 | 1.5 |
| 60 | 23 | 1,367 | 1.3 |
✅ NRV030 Core Features
🔗 Solid Shaft Input — Drive Flexibility
The solid keyed input shaft accepts chain sprockets, belt pulleys, couplings, and hand-wheel connections that cannot be achieved with a bore-input flange unit, giving designers full freedom over the drive arrangement geometry.
◯ Same Torque as NMRV030
The NRV030 delivers identical output torque (up to 1,367 N·m) to the NMRV030 because both use the same internal worm gear assembly. The only difference is the input arrangement, not the mechanical performance.
🌿 Built for Agricultural & Outdoor Use
The die-cast aluminium housing, IP54 sealing, and electrostatic paint provide multi-year corrosion resistance in the dusty, wet, and UV-intense conditions of Australian agricultural and outdoor industrial environments.
🔧 Six Mounting Positions
B3, B6, B7, B8, V5, V6 orientations are supported, giving engineers the same mounting versatility as the NMRV range without needing an IEC motor adaptor.
🌞 Efficient Passive Cooling
The finned aluminium housing dissipates operating heat four times faster than cast iron, keeping lubricant temperature stable during continuous-duty chain-driven applications where motor cooling fans do not assist gearbox cooling.
🏭 Where the NRV030 Excels
🌿 Agricultural Machinery
Shaft-input worm gear speed reducer for seed drill metering drives, irrigation pump speed reducers, and crop-spray boom actuators driven by chain from a PTO or engine countershaft.
⚙ Custom Automation & Machinery
Compact aluminium worm gearbox for custom jig and fixture rotators, automated door actuators, and non-standard machinery where the driving source presents a shaft rather than an IEC flange.
🚢 Marine & Deck Equipment
Corrosion-resistant shaft-input worm gear reduction gearbox for small craft steering gear, davit drives, and deck-mounted winch speed reductions where belt or chain primary drives are standard.
📦 Light Industrial Conveyors
Worm gearmotor alternative for light conveyors driven by a chain from a central line shaft, common in legacy factory layouts where individual motor-flange gearboxes are impractical.
🔎 NMRV030 vs NRV030 — Choosing the Right Series
| Feature | EP-NMRV030 | EP-NRV030 |
|---|---|---|
| Input Type | Bore input with IEC flange | Solid shaft input, no flange |
| Motor Connection | Direct IEC B5/B14 face mount | Chain, belt, or coupling |
| IEC Flange Sizes | 56B14, 63B14, 63B5 | Not applicable |
| Best For | Motor-integrated gearmotor assemblies | Non-standard or shaft-based drive sources |
| Output Torque | Up to 1,367 N·m | Up to 1,367 N·m |
| Physical Size | Identical housing dimensions | Identical housing dimensions |
NRV030 Output Shaft Dimensions
| Parameter | DZ Single Shaft | SZ Double Shaft |
|---|---|---|
| G1 (mm) | 63 | 63 |
| K1 (mm) | 64 | 64 |
| L (mm) | 102 | 128 |
| d h6 (mm) | 14 | 14 |
| Keyway | M6 | M6 |
❓ FAQs — EP-NRV030
What is the key difference between the NRV030 and NMRV030?
The NRV030 has a solid keyed input shaft (no IEC flange) while the NMRV030 has a bore input with an IEC flange for direct motor face mounting. The internal worm gear assembly, output torque rating, housing dimensions, and output shaft options are identical between the two.
What input shaft diameter does the NRV030 have?
The NRV030 input shaft diameter is 14 mm h6 with a standard key, matching the NMRV030’s bore input diameter of 14 mm H7. This allows the same chain sprockets or belt pulleys to be used on both series for cross-series application compatibility.
Can I drive the NRV030 input shaft with a V-belt pulley?
Yes. The NRV030 solid input shaft accepts a V-belt pulley mounted with a key and set screw. Ensure the pulley overhung load (FrL) does not exceed the allowable radial load Fr for the selected ratio (see the radial load table). Position the pulley as close to the housing as possible to minimise the overhung moment.
Is the NRV030 rated for outdoor agricultural use in Australia?
Yes. IP54 sealing and the aluminium housing with electrostatic paint provide reliable protection in Australian rural environments including dusty paddocks, humid irrigation areas, and coastal farm situations. For permanent outdoor exposure with direct rain ingress, specify the IP65 variant.
Can the NRV030 be back-driven from the output shaft?
At ratios below 30:1, the NRV030 can be back-driven (dynamic efficiency above 0.5). At ratios 30:1 and above, static self-locking becomes increasingly reliable. Always verify the dynamic efficiency value at your operating ratio before relying on self-lock for safety-critical hold applications.
⭐ Customer Reviews
★★★★★
“We fitted the NRV030 on our automated seed-drill metering mechanism, driven by a chain from the machine’s main drive shaft. The gearbox fits perfectly in the available space and after two seasons in dusty paddock conditions, the seals and finish are in perfect condition.”
Scott P. — Senior Mechanic, Cropping Farm 🇦🇺 Australia (Victoria)
★★★★★
“Our irrigation pump speed reducer uses an NRV030 at i=20, belt-driven from a 0.12 kW motor. The aluminium housing handles the wet, outdoor environment without any corrosion. Simple and reliable — exactly what we needed.”
Maria J. — Farm Manager, Horticulture 🇪🇸 Spain
★★★★☆
“We use the NRV030 on our custom jig rotator for welding fixtures. The solid shaft input connected easily to our existing hand-wheel drive and the output bore accommodated our 19 mm fixture pin with a simple sleeve adaptor.”
David L. — Workshop Engineer, Custom Fabrication 🇬🇧 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.
Get a Quote for EP-NRV030
Our team will confirm the input shaft key dimensions, output shaft type, and ratio for your application. Custom input and output shaft options available for OEM volume orders.
The EP-NRV030 aluminium worm gearbox features a 30 mm centre distance, ratios from 5 to 100, input power up to 0.18 kW, and maximum output torque of 1,367 N·m. Unlike the NMRV030, the NRV030 uses a solid shaft input without an input flange, making it the ideal shaft-input worm gear speed reducer for direct coupling to chain drives, belt drives, or non-standard motors — suited to agricultural equipment, custom automation, and any application where flange mounting is not required.
