Descrizione
EP-NRV040 Aluminium Worm Gearbox — Overview
The EP-NRV040 is a direct-coupled mid-range aluminium worm gearbox — a versatile mid-range unit in the NRV series, engineered around a 040 mm worm gear centre distance. Unlike the NMRV series which features a hollow-bore IEC motor flange input, the NRV040 uses a solid 11 mm solid input shaft with a precision-ground keyway, making it purpose-built for belt-driven, chain-driven, and shaft-coupled drive systems across belt-driven pump stations, chain conveyors, industrial mixers, and woodworking lines. The solid shaft input eliminates the need for a motor flange adaptor, enabling shorter drive train layouts and seamless integration into multi-stage gear systems. With output torques up to 400 Nm, reduction ratios from 5–100:1, and a die-cast aluminium A360 housing with IP65 shaft sealing, the EP-NRV040 delivers reliable, corrosion-resistant performance for belt-driven and chain-driven industrial machinery. Six mounting positions and three output configurations give machine designers full layout flexibility across Australian and international installations.
Technical Specifications — EP-NRV040
General Specifications
| Parameter | Specification |
|---|---|
| Model Number | EP-NRV040 |
| Series | NRV — Solid input shaft, no motor flange |
| Centre Distance | 040 mm |
| Max Output Torque | 400 Nm |
| Reduction Ratios | 5–100:1 |
| Input Shaft Diameter | 11 mm solid |
| Input Shaft Keyway | 4×2.5 mm |
| Input Shaft Tolerance | h6 (precision ground) |
| Max Input Shaft Radial Load (Fri max) | 350 N |
| Output Shaft Diameter | 18 mm |
| Max Recommended Input Power | 0.12 kW |
| Housing Material | Die-cast aluminium alloy A360 |
| Worm Wheel Material | Phosphor bronze |
| Worm Shaft Material | 20CrMnTi case-hardened steel, ground |
| Surface Treatment | Baked enamel paint (RAL 5010 blue) |
| Lubricant | ISO VG 220 worm gear oil, ~0.20 L |
| IP Rating | IP65 (shaft seals standard) |
| Ambient Temperature | -10°C to +40°C standard; up to +60°C with synthetic oil |
| Max Input Speed | 1,400 rpm (recommended); 1,800 rpm (max) |
| Approx. Weight | ~2.5 kg |
| Mounting Positions | B3, B6, B7, B8, V5, V6 |
| Output Configurations | Solid shaft / Double shaft (DZ) / Output flange (FL) |
| Input Connection | Solid shaft with keyway — use coupling, pulley, or sprocket |
| Standards | ISO 9001, CE marking |
Performance Selection Data (1,400 rpm Input)
| Ratio (i) | Output Speed (r/min) | Output Torque (Nm) | Input Power (kW) |
|---|---|---|---|
| 7.5:1 | 187 | 400 | 0.12 |
| 10:1 | 140 | 430 | 0.12 |
| 15:1 | 93 | 470 | 0.12 |
| 20:1 | 70 | 500 | 0.12 |
| 30:1 | 47 | 540 | 0.12 |
| 50:1 | 28 | 560 | 0.12 |
Core Features & Benefits
◯Solid Shaft Input — No Motor Flange Required
The EP-NRV040 solid 11 mm solid input shaft accepts standard couplings, pulleys, and chain sprockets directly. Ideal for belt/chain-driven systems and multi-stage gear trains where no IEC motor flange is needed — simplifying drive layout and reducing component count.
△Corrosion-Resistant Die-Cast Aluminium Housing
A360 die-cast aluminium provides inherent corrosion resistance for food processing washdowns, coastal Australian sites, and humid industrial environments. The baked enamel finish adds UV and chemical protection for outdoor and industrial installations.
◆Precision Ground Worm Shaft — Low Noise Operation
Ground worm shaft and precision-hobbed phosphor bronze wheel deliver smooth, low-noise torque transmission. Aluminium housing vibration damping further reduces structure-borne noise in printing, packaging, and textile machinery applications.
■Six Mounting Positions + Three Output Options
B3, B6, B7, B8, V5, V6 mounting orientations combined with solid shaft, double shaft (DZ), and output flange (FL) output options provide complete layout flexibility for complex multi-axis drive systems.
▶Static Self-Locking at Ratios ≥ 40:1
At ratios of 40:1 and above, worm geometry prevents back-drive under static load — simplifying gate actuators, conveyor braking systems, and positioning drives without an external holding brake.
●Superior Heat Dissipation — Extended Oil and Seal Life
Aluminium thermal conductivity (~160 W/m·K) dissipates gear-generated heat up to 3× faster than cast iron, keeping operating temperatures lower and extending lubricant life — critical for high-duty-cycle shaft-coupled drive applications.
EP-NRV040 vs EP-NMRV040 — Which Input Type is Right for You?
The NRV and NMRV series share identical worm sets, output shafts, housings, and torque ratings. The only difference is the input configuration. Use this comparison to select the right input type for your application.
| Feature | EP-NRV040 (Solid Shaft Input) | EP-NMRV040 (IEC Flange Input) |
|---|---|---|
| Input Connection | Solid shaft — coupling, pulley, sprocket | Hollow bore with IEC motor flange |
| Motor Mounting | No motor flange — flexible drive layout | Direct motor mounting via IEC flange |
| Best Application | Gear trains, belt/chain drives, multi-stage systems | Direct motor-to-gearbox mounting |
| Housing Material | Die-cast aluminium A360 | Die-cast aluminium A360 (same body) |
| Output Torque | Up to 400 Nm (identical) | Up to 400 Nm (identical) |
| Drive Train Length | Shorter — no motor/adaptor overhang | Slightly longer with motor mounted |
| Corrosion Resistance | Excellent — same aluminium housing | Excellent — same aluminium housing |
| IP Rating | IP65 shaft seals standard | IP65 shaft seals standard |
| Noise Level | Low — same worm set | Low — same worm set |
| Weight | ~2.5 kg | ~2.5 kg (same) |
Application Sectors — EP-NRV040
The EP-NRV040 solid-shaft worm gearbox is suited to the following industries and drive system types, each benefiting from direct shaft coupling without a motor flange.
⚘ Belt-Driven Pumps
Suitable worm gearbox solid shaft for belt driven pumps.
⚙ Chain Conveyors
Suitable direct drive worm reducer for chain conveyors.
⚚ Industrial Mixers
Suitable shaft input worm gearbox industrial mixer.
⚒ Woodworking Lines
Suitable solid shaft worm reducer woodworking machinery.
⚛ HVAC Shaft Drives
Suitable NRV worm gearbox HVAC shaft drive.
Selection Guide, Mounting Positions & Shaft Details
How to Select the Correct Ratio
- Calculate required output torque: M₂ = 9,550 × P (kW) / n₂ (rpm), then multiply by service factor (fs = 1.0–2.5).
- Determine actual input shaft speed: For belt/chain drives, n_input = n_motor × (D_motor pulley / D_NRV pulley). Use this as your input speed, not the motor rated speed.
- Find your ratio: i = n_input / n_output. Select the closest available ratio from 5–100:1.
- Confirm torque capacity: The selected ratio’s rated torque must exceed M₂ × fs. If not, step up to EP-NRV050.
- Check input shaft radial load: Calculate belt/chain tension force and verify it does not exceed Fri max = 350 N.
Input & Output Shaft Details
Input shaft: 11 mm solid | Keyway: 4×2.5 mm | Tolerance: h6 | Max radial load: 350 N
Mount couplings, pulleys, and sprockets directly. Use a keyway-secured locking collar or hub to prevent axial movement. Calculate input shaft radial load from belt/chain tension and verify against Fri max = 350 N.
18 mm diameter with keyway. Single-sided. Default supply.
Shaft exits both sides. Bidirectional take-off. Suffix: DZ.
Direct bolt-on flange connection. Eliminates coupling. Suffix: FL.
Mounting Positions
| Position | Description | Shaft Orientation | Oil Level Note |
|---|---|---|---|
| B3 | Horizontal foot mount | Horizontal | Standard fill level — default factory supply |
| B6 | Foot mount, output shaft down | Vertical downward | Reduce oil by ~15% |
| B7 | Foot mount, output shaft up | Vertical upward | Increase oil by ~15% |
| B8 | Foot mount, output shaft horizontal (180°) | Horizontal reversed | Standard fill level |
| V5 | Flange mount, shaft down | Vertical downward | Reduce oil — check lubrication guide |
| V6 | Flange mount, shaft up | Vertical upward | Increase oil — check lubrication guide |
Frequently Asked Questions — EP-NRV040
▶ Why choose the EP-NRV040 over the EP-NMRV040 for a belt-driven application?
The EP-NRV040 with its solid 11 mm input shaft is purpose-built for belt-driven and chain-driven systems where power arrives via a pulley or sprocket rather than a motor flange. It avoids the need for a motor adaptor, reduces overall drive train length, and is ideal when the motor is remote or already driving another component.
▶ What is the input shaft specification of the EP-NRV040?
The EP-NRV040 features an 11 mm solid input shaft machined to h6 tolerance with a 4×2.5 mm keyway. The shaft protrudes on one side of the housing, ready for direct pulley, sprocket, or coupling mounting. Maximum input radial load (Fri max) is 350 N.
▶ What output torque does the EP-NRV040 deliver?
The EP-NRV040 delivers up to 400 Nm of output torque at 1,400 rpm input, depending on gear ratio. This supports pump drives, chain conveyor gearboxes, and industrial mixing shafts in compact aluminium-housed drive systems.
▶ What are the available reduction ratios for the EP-NRV040?
Available ratios: 5, 7.5, 10, 15, 20, 25, 30, 40, 50, 60, 80, and 100. For belt-driven inputs at reduced speed, apply the actual input shaft speed to the selection calculation rather than the motor’s rated speed.
▶ Does the EP-NRV040 support dual output shafts?
Yes — specify suffix DZ for a double output shaft configuration (both sides of the output bearing housing are fitted with shafts). This is useful when driving two parallel conveyor branches or rolls from a single chain-driven gearbox.
▶ How does the EP-NRV040 handle thrust loads on the input shaft?
The EP-NRV040 input shaft bearings are designed primarily for radial loads. Axial thrust loads on the input shaft should be minimised by using flexible couplings or properly aligned belt/chain drives. For applications with significant input axial loads, contact our engineers for bearing selection guidance.
Customer Reviews
★★★★★
“Running EP-NRV040 units on belt-driven irrigation pump stations across rural New South Wales. The solid input shaft takes our V-belt pulleys directly, and the aluminium housing handles the heat and dust of outback conditions without complaint. Excellent value.”
Brendan Kelly — Industrial Pump Services
Australia
★★★★★
“Used in the feed drive gear trains of our panel saws. The 11 mm solid input shaft couples neatly to our servo output shafts. Precise ratio delivery is essential for our cutting feed speed — very satisfied with the consistency.”
Sofia Andersson — Woodworking Machinery AB
Sweden
★★★★☆
“Installed on chain-driven conveyor drives. The solid shaft input simplifies our sprocket mounting and the compact aluminium body fits our tight drive cabinet layouts. Consistent quality across multiple batches.”
Zhang Wei — Chain Conveyor Systems
China
Related Products & Accessories
⚙ Input Connection Options
Flexible jaw couplings and disc couplings for 11 mm solid shaft.
Chain sprockets and V-belt pulleys (calculate Fri against 350 N max).
Toothed-belt pulley (verify radial load).
Bearing support bracket for high-tension chain/belt drives.
⚒ Output Accessories
■ Single solid output shaft (standard, 18 mm)
■ Double bidirectional shaft (DZ)
■ Output flange (FL)
■ Torque arm for torque reaction mounting
■ Dust cover for unused shaft end
◆ Related Series
■ EP-NMRV040 — hollow bore IEC flange input variant
■ EP-NRV-E040 — solid input, coaxial inline output
■ EP-NMRV-E040 — IEC flange input, coaxial output
■ EP-NRV050 — next frame size up
Ready to Order the EP-NRV040?
Request a quote, technical selection support, or enquire about OEM and distributor partnership opportunities for Australian and international markets.
▼ Distributor & OEM partnerships welcome — volume pricing available
