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EP-NRV110 Aluminium Worm Gearbox — Overview
The EP-NRV110 is a large-frame shaft drive aluminium worm gearbox — a large-frame shaft-input unit in the NRV series, engineered around a 110 mm worm gear centre distance. Unlike the NMRV series which features a hollow-bore IEC motor flange input, the NRV110 uses a solid 38 mm solid input shaft with a precision-ground keyway, making it purpose-built for belt-driven, chain-driven, and shaft-coupled drive systems across steel processing gear trains, heavy mixer shafts, winch drive trains, and port machinery. 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 8000 Nm, reduction ratios from 7.5–100:1, and a die-cast aluminium A360 housing with IP65 shaft sealing, the EP-NRV110 delivers reliable, corrosion-resistant performance for steel processing lines and heavy-duty gear trains. Six mounting positions and three output configurations give machine designers full layout flexibility across Australian and international installations.
Technical Specifications — EP-NRV110
General Specifications
| Parameter | Specification |
|---|---|
| Model Number | EP-NRV110 |
| Series | NRV — Solid input shaft, no motor flange |
| Centre Distance | 110 mm |
| Max Output Torque | 8000 Nm |
| Reduction Ratios | 7.5–100:1 |
| Input Shaft Diameter | 38 mm solid |
| Input Shaft Keyway | 10×5.0 mm |
| Input Shaft Tolerance | h6 (precision ground) |
| Max Input Shaft Radial Load (Fri max) | 1700 N |
| Output Shaft Diameter | 50 mm |
| Max Recommended Input Power | 1.1 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, ~2.5 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 | ~25 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) |
|---|---|---|---|
| 10:1 | 140 | 4285 | 1.1 |
| 15:1 | 93 | 4905 | 1.1 |
| 20:1 | 70 | 5399 | 1.1 |
| 25:1 | 56 | 5816 | 1.1 |
| 30:1 | 47 | 6181 | 1.1 |
| 40:1 | 35 | 6803 | 1.1 |
| 50:1 | 28 | 7607 | 1.1 |
Core Features & Benefits
◯Solid Shaft Input — No Motor Flange Required
The EP-NRV110 solid 38 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-NRV110 vs EP-NMRV110 — 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-NRV110 (Solid Shaft Input) | EP-NMRV110 (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 8000 Nm (identical) | Up to 8000 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 | ~25 kg | ~25 kg (same) |
Application Sectors — EP-NRV110
The EP-NRV110 solid-shaft worm gearbox is suited to the following industries and drive system types, each benefiting from direct shaft coupling without a motor flange.
⚘ Steel Processing Gear Trains
Suitable large frame NRV worm gearbox steel processing.
⚙ Heavy Mixer Shafts
Suitable solid shaft worm reducer heavy mixer.
⚚ Winch Drive Trains
Suitable shaft input worm gearbox winch drive train.
⚒ Port Machinery
Suitable NRV worm reducer port machinery.
⚛ Large Fan Drives
Suitable large solid shaft worm gearbox fan 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 7.5–100:1.
- Confirm torque capacity: The selected ratio’s rated torque must exceed M₂ × fs. If not, step up to EP-NRV130.
- Check input shaft radial load: Calculate belt/chain tension force and verify it does not exceed Fri max = 1700 N.
Input & Output Shaft Details
Input shaft: 38 mm solid | Keyway: 10×5.0 mm | Tolerance: h6 | Max radial load: 1700 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 = 1700 N.
50 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-NRV110
▶ What differentiates the EP-NRV110 from the EP-NMRV110?
The EP-NRV110 uses a solid 38 mm input shaft with a 10×5.0 mm keyway instead of the NMRV110’s hollow-bore motor flange. This makes the NRV110 the choice for steel processing gear trains, winch drive trains, and heavy mixer shafts where power arrives via a coupling or chain — not a directly-flanged motor.
▶ What is the output torque capacity of the EP-NRV110?
The EP-NRV110 is rated up to approximately 8,000 Nm of output torque through its 50 mm output shaft — suitable for steel coil line feeders, rolling mill auxiliary drives, and heavy press feed mechanisms in large-scale manufacturing.
▶ What coupling is recommended for the EP-NRV110’s 38 mm input shaft?
For motor-to-gearbox coupling, use a flexible jaw or disc coupling rated for the applied torque. For chain-driven inputs, select an 8-tooth or larger sprocket to distribute chain tension. Maximum input shaft radial load (Fri max) is 1,700 N — use a bearing support bracket for higher chain tensions.
▶ What is the maximum input speed for the EP-NRV110?
Rated maximum input speed is 1,400 rpm (recommended) and 1,800 rpm (absolute maximum). For VFD-driven applications, operate between 700–1,400 rpm to maintain adequate lubrication splash within the housing.
▶ How does the aluminium housing of the EP-NRV110 handle industrial heat?
The die-cast A360 aluminium housing handles ambient temperatures up to 40°C with standard mineral oil and up to 60°C with synthetic oil. Its thermal conductivity (~160 W/m·K) dissipates gear-generated heat faster than cast iron, keeping operating temperatures 10–15°C lower than equivalent cast iron units.
▶ What are the overall envelope dimensions of the EP-NRV110?
Overall housing length (A) 255 mm, width (B) 295 mm, height (C) 170 mm. Output shaft length from housing face is 162 mm. Input shaft protrudes to one side, with usable shaft length available for coupling or sprocket mounting. These dimensions are compatible with standard 110-frame worm gearbox mounting patterns.
Customer Reviews
★★★★★
“The EP-NRV110 is installed in the final reduction stage of our cold-rolled coil slitting line gear train. The solid 38 mm input shaft connects via a disc coupling to our primary gearbox output. At 8,000 Nm output torque it handles the thickest stainless coil grades without straining. Outstanding build quality.”
Nathan Hughes — Steel Processing Solutions
Australia
★★★★★
“Integrated into the mixer shaft drive trains of our large industrial processing plant. The thermal performance of the aluminium housing keeps operating temperatures well within spec even at sustained heavy loads — no external cooling required.”
Olivier Martin — Heavy Industry Drive Systems
France
★★★★☆
“Used in the drive gear trains of our bulk material scraper conveyors at a South Island port. The salt-air coastal environment has had no impact on the aluminium housing. Easy to service and the solid shaft input simplifies our coupling arrangements.”
Callum Fraser — Port Engineering NZ
New Zealand
Related Products & Accessories
⚙ Input Connection Options
Flexible jaw couplings and disc couplings for 38 mm solid shaft.
Chain sprockets and V-belt pulleys (calculate Fri against 1700 N max).
Toothed-belt pulley (verify radial load).
Bearing support bracket for high-tension chain/belt drives.
⚒ Output Accessories
■ Single solid output shaft (standard, 50 mm)
■ Double bidirectional shaft (DZ)
■ Output flange (FL)
■ Torque arm for torque reaction mounting
■ Dust cover for unused shaft end
◆ Related Series
■ EP-NMRV110 — hollow bore IEC flange input variant
■ EP-NRV-E110 — solid input, coaxial inline output
■ EP-NMRV-E110 — IEC flange input, coaxial output
■ EP-NRV130 — next frame size up
Ready to Order the EP-NRV110?
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
