Description
EP-NRV050 Aluminium Worm Gearbox — Overview
The EP-NRV050 is a shaft-input precision aluminium worm gearbox — a balanced torque-to-size unit in the NRV series, engineered around a 050 mm worm gear centre distance. Unlike the NMRV series which features a hollow-bore IEC motor flange input, the NRV050 uses a solid 14 mm solid input shaft with a precision-ground keyway, making it purpose-built for belt-driven, chain-driven, and shaft-coupled drive systems across printing presses, bottling line geartrains, packaging lines, and custom drive systems. 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 800 Nm, reduction ratios from 5–100:1, and a die-cast aluminium A360 housing with IP65 shaft sealing, the EP-NRV050 delivers reliable, corrosion-resistant performance for shaft-coupled drives on printing and packaging equipment. Six mounting positions and three output configurations give machine designers full layout flexibility across Australian and international installations.
Technical Specifications — EP-NRV050
General Specifications
| Parameter | Specification |
|---|---|
| Model Number | EP-NRV050 |
| Series | NRV — Solid input shaft, no motor flange |
| Centre Distance | 050 mm |
| Max Output Torque | 800 Nm |
| Reduction Ratios | 5–100:1 |
| Input Shaft Diameter | 14 mm solid |
| Input Shaft Keyway | 5×3.0 mm |
| Input Shaft Tolerance | h6 (precision ground) |
| Max Input Shaft Radial Load (Fri max) | 490 N |
| Output Shaft Diameter | 25 mm |
| Max Recommended Input Power | 0.18 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, ~0.35 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 | ~4.0 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 | 650 | 0.18 |
| 10:1 | 140 | 750 | 0.18 |
| 15:1 | 93 | 860 | 0.18 |
| 20:1 | 70 | 950 | 0.18 |
| 30:1 | 47 | 1020 | 0.18 |
| 50:1 | 28 | 1080 | 0.18 |
Core Features & Benefits
◯Solid Shaft Input — No Motor Flange Required
The EP-NRV050 solid 14 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-NRV050 vs EP-NMRV050 — 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-NRV050 (Solid Shaft Input) | EP-NMRV050 (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 800 Nm (identical) | Up to 800 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 | ~4.0 kg | ~4.0 kg (same) |
Application Sectors — EP-NRV050
The EP-NRV050 solid-shaft worm gearbox is suited to the following industries and drive system types, each benefiting from direct shaft coupling without a motor flange.
⚘ Printing Presses
Suitable solid shaft worm gearbox for printing presses.
⚙ Bottling Gear Trains
Suitable NRV worm reducer for bottling gear trains.
⚚ Packaging Lines
Suitable direct shaft worm gearbox packaging line.
⚒ Custom Drive Systems
Suitable shaft input worm reducer for custom drive systems.
⚛ Conveyor Drives
Suitable worm gearbox solid input for conveyor drives.
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-NRV063.
- Check input shaft radial load: Calculate belt/chain tension force and verify it does not exceed Fri max = 490 N.
Input & Output Shaft Details
Input shaft: 14 mm solid | Keyway: 5×3.0 mm | Tolerance: h6 | Max radial load: 490 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 = 490 N.
25 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-NRV050
▶ What makes the EP-NRV050 suitable for printing press gear trains?
The EP-NRV050’s solid 14 mm input shaft integrates directly into printing press gear trains, accepting chain sprockets and gear couplings without a motor adaptor. Its low-noise phosphor bronze worm wheel and precision-ground worm shaft minimise vibration transmission — critical for print registration accuracy.
▶ What input shaft diameter does the EP-NRV050 use?
The EP-NRV050 has a 14 mm solid input shaft with a 5×3.0 mm keyway, machined to h6 tolerance. Suitable for mounting standard gear couplings, chain sprockets, and V-belt pulleys. Maximum input radial load (Fri max) is 490 N.
▶ Can the EP-NRV050 be driven from a chain or toothed belt?
Yes. The NRV050 is commonly used in chain-driven and toothed-belt applications. Calculate the effective radial force (Fre) on the input shaft from your sprocket/pulley diameter and tension. Ensure Fre does not exceed Fri max = 490 N. For chains, apply the chain transmission attachment factor fz (1.0–1.25 for spur chains).
▶ How does the EP-NRV050 compare to the EP-NMRV050?
The EP-NRV050 is mechanically equivalent to the NMRV050 (same housing, worm set, and output shaft) but with a solid input shaft instead of a hollow-bore motor flange. Choose the NRV050 when power comes from a shaft, belt, or chain; choose the NMRV050 when a motor mounts directly to the flange.
▶ What output shaft options are available for the EP-NRV050?
The standard NRV050 has a single 25 mm solid output shaft with keyway. Options include: double output shaft (DZ suffix) for bidirectional take-off, and output flange (FL suffix) for direct bolt-on connection to driven equipment.
▶ What is the maximum input speed for the EP-NRV050?
The EP-NRV050 is rated for a maximum input speed of 1,800 rpm, with 1,400 rpm recommended for optimal lubrication and longevity. For VFD-controlled motor applications driving a shaft-coupled NRV050, operate between 700–1,400 rpm.
Customer Reviews
★★★★★
“The EP-NRV050 drives the secondary shaft of our overwrap machine gear train. Connecting directly to the shaft with a jaw coupling eliminated the motor adaptor bracket we used previously, cleaning up the drive layout significantly. Quiet, efficient, and no oil leaks after a year of production.”
Michelle Tran — Packaging Systems Pty Ltd
Australia
★★★★★
“Integrated into the gear train of our web offset printing press. The solid 14 mm input shaft connects directly to our drive shaft via a toothed coupling. Excellent ratio accuracy and vibration-free operation — critical for print quality.”
Giovanni Ricci — Printing Machinery Italia
Italy
★★★★☆
“Used in the main drive gear trains of our rotary bottle filling machines. The NRV050 solid shaft input integrates cleanly into our multi-drive layout without the extra flange hardware. Good quality and very compact for the torque on offer.”
Kim Ji-su — Bottling Equipment Co.
South Korea
Related Products & Accessories
⚙ Input Connection Options
Flexible jaw couplings and disc couplings for 14 mm solid shaft.
Chain sprockets and V-belt pulleys (calculate Fri against 490 N max).
Toothed-belt pulley (verify radial load).
Bearing support bracket for high-tension chain/belt drives.
⚒ Output Accessories
■ Single solid output shaft (standard, 25 mm)
■ Double bidirectional shaft (DZ)
■ Output flange (FL)
■ Torque arm for torque reaction mounting
■ Dust cover for unused shaft end
◆ Related Series
■ EP-NMRV050 — hollow bore IEC flange input variant
■ EP-NRV-E050 — solid input, coaxial inline output
■ EP-NMRV-E050 — IEC flange input, coaxial output
■ EP-NRV063 — next frame size up
Ready to Order the EP-NRV050?
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
