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EP-NRV130 Aluminium Worm Gearbox — Overview
The EP-NRV130 is a extra-large shaft input aluminium worm gearbox — an extra-large shaft-input unit in the NRV series, engineered around a 130 mm worm gear centre distance. Unlike the NMRV series which features a hollow-bore IEC motor flange input, the NRV130 uses a solid 42 mm solid input shaft with a precision-ground keyway, making it purpose-built for belt-driven, chain-driven, and shaft-coupled drive systems across paper mill drive trains, heavy crane mechanisms, large extruder shaft drives. 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 11000 Nm, reduction ratios from 7.5–100:1, and a die-cast aluminium A360 housing with IP65 shaft sealing, the EP-NRV130 delivers reliable, corrosion-resistant performance for paper mill and large-scale industrial gear trains. Six mounting positions and three output configurations give machine designers full layout flexibility across Australian and international installations.
Technical Specifications — EP-NRV130
General Specifications
| Parameter | Specification |
|---|---|
| Model Number | EP-NRV130 |
| Series | NRV — Solid input shaft, no motor flange |
| Centre Distance | 130 mm |
| Max Output Torque | 11000 Nm |
| Reduction Ratios | 7.5–100:1 |
| Input Shaft Diameter | 42 mm solid |
| Input Shaft Keyway | 12×5.0 mm |
| Input Shaft Tolerance | h6 (precision ground) |
| Max Input Shaft Radial Load (Fri max) | 2100 N |
| Output Shaft Diameter | 60 mm |
| Max Recommended Input Power | 2.2 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, ~3.5 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 | ~38 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 | 8000 | 2.2 |
| 15:1 | 93 | 9000 | 2.2 |
| 20:1 | 70 | 9584 | 2.2 |
| 25:1 | 56 | 10000 | 2.2 |
| 30:1 | 47 | 10400 | 2.2 |
| 40:1 | 35 | 11051 | 2.2 |
| 50:1 | 28 | 11500 | 2.2 |
Core Features & Benefits
◯Solid Shaft Input — No Motor Flange Required
The EP-NRV130 solid 42 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-NRV130 vs EP-NMRV130 — 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-NRV130 (Solid Shaft Input) | EP-NMRV130 (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 11000 Nm (identical) | Up to 11000 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 | ~38 kg | ~38 kg (same) |
Application Sectors — EP-NRV130
The EP-NRV130 solid-shaft worm gearbox is suited to the following industries and drive system types, each benefiting from direct shaft coupling without a motor flange.
⚘ Paper Mill Drive Trains
Suitable extra large NRV worm gearbox paper mill.
⚙ Heavy Crane Mechanisms
Suitable solid shaft worm reducer crane mechanism.
⚚ Large Extruder Shafts
Suitable shaft coupled worm gearbox extruder drive.
⚒ Cement Conveyor Drives
Suitable NRV worm reducer cement conveyor.
⚛ Mining Gear Trains
Suitable large shaft input worm gearbox mining.
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-NRV150.
- Check input shaft radial load: Calculate belt/chain tension force and verify it does not exceed Fri max = 2100 N.
Input & Output Shaft Details
Input shaft: 42 mm solid | Keyway: 12×5.0 mm | Tolerance: h6 | Max radial load: 2100 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 = 2100 N.
60 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-NRV130
▶ What shaft-coupled applications suit the EP-NRV130?
The EP-NRV130 is engineered for paper mill drive trains, heavy gantry crane travel drives, large extruder secondary shafts, and cement conveyor gear trains where power is delivered via a shaft coupling or chain rather than a flanged motor — delivering up to 11,000 Nm through a 60 mm output shaft.
▶ What is the input shaft specification of the EP-NRV130?
The EP-NRV130 has a 42 mm solid input shaft with a 12×5.0 mm keyway machined to h6 tolerance. Maximum input shaft radial load (Fri max) is 2,100 N. For high-tension chain or belt drives, provide a bearing support bracket to protect the input shaft bearings.
▶ How much lubricant does the EP-NRV130 require?
The EP-NRV130 holds approximately 3.5 litres of ISO VG 220 worm gear oil in B3 orientation. Oil change intervals are every 5,000 hours (mineral oil) or up to 10,000 hours with synthetic oil. Adjust fill quantity for V5/V6 vertical mounting orientations.
▶ What are the self-locking characteristics of the EP-NRV130?
Static self-locking is present at gear ratios of 40:1 and above, preventing output back-drive under static load. At 30:1, self-locking is borderline. For safety-critical vertical load retention in crane or paper mill winding drives, install a certified external holding brake regardless of gear ratio.
▶ What output shaft options does the EP-NRV130 offer?
Standard: single 60 mm solid output shaft. Options: double output shaft (DZ suffix) for simultaneous bidirectional take-off, and output flange (FL suffix) for direct bolt-on connection to drum flanges or large couplings. Specify the required suffix when ordering.
▶ Is the EP-NRV130 suitable for corrosive paper mill environments?
Yes. The die-cast aluminium housing provides inherent corrosion resistance against the humid, chemically active paper mill atmosphere. The IP65 shaft seals prevent process fluid ingress. For particularly aggressive chemical environments, specify enhanced Viton shaft seals and an epoxy topcoat on the housing.
Customer Reviews
★★★★★
“We rebuilt our paper slitter drive trains with EP-NRV130 units. The solid 42 mm input shaft couples directly to our primary gearbox output via a disc coupling, eliminating the flange adaptor hardware we used previously. Torque delivery at 30:1 is spot-on for our 3.5 m web width. Outstanding in the humid mill environment.”
Daniel Morrison — Paper Mill Engineering Pty
Australia
★★★★★
“Installed as the final drive stage in our heavy gantry crane travel gear trains. The self-locking characteristic at 40:1 provides secure static load holding. The 60 mm output shaft takes our large drive wheel coupling without any undersizing issues.”
Erik Lindgren — Crane Engineering AB
Sweden
★★★★★
“Powers the secondary drive stage on our cement raw meal conveyor gear trains. IP65 sealing has kept the units clean internally for over two years despite heavy cement dust. The aluminium housing is significantly lighter than the cast iron units it replaced — a real benefit on our elevated conveyor structures.”
Manuel Torres — Cement Processing Ingeniería
Spain
Related Products & Accessories
⚙ Input Connection Options
Flexible jaw couplings and disc couplings for 42 mm solid shaft.
Chain sprockets and V-belt pulleys (calculate Fri against 2100 N max).
Toothed-belt pulley (verify radial load).
Bearing support bracket for high-tension chain/belt drives.
⚒ Output Accessories
■ Single solid output shaft (standard, 60 mm)
■ Double bidirectional shaft (DZ)
■ Output flange (FL)
■ Torque arm for torque reaction mounting
■ Dust cover for unused shaft end
◆ Related Series
■ EP-NMRV130 — hollow bore IEC flange input variant
■ EP-NRV-E130 — solid input, coaxial inline output
■ EP-NMRV-E130 — IEC flange input, coaxial output
■ EP-NRV150 — next frame size up
Ready to Order the EP-NRV130?
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
