Description
EP-NMRV090 Aluminium Worm Gearbox — Overview
The EP-NMRV090 is a heavy industrial aluminium worm gearbox representing a heavy-duty workhorse unit in the NMRV series, engineered around a 090 mm worm gear centre distance. Developed to meet growing demand for lightweight, corrosion-resistant drive solutions across mining conveyors, crane drives, and large extruder lines, it combines precision-manufactured worm and wheel geometry with a robust die-cast aluminium A360 housing that delivers natural corrosion resistance without the bulk of traditional cast iron. The NMRV090 accepts IEC motor flanges (80B14, 90B14, 100B14, 112B14, 112B5), enabling direct motor-to-gearbox coupling without adaptors — a significant advantage for machine builders seeking compact, efficient drive packages. With output torques up to 5000 Nm and reduction ratios from 7.5–100:1, the EP-NMRV090 reliably serves mining, construction, and heavy manufacturing across Australia and international markets. IP65 shaft sealing, six mounting positions, and a smooth baked-enamel finish make it equally at home in food processing washdown areas, outdoor plant rooms, and demanding industrial environments.
Technical Specifications — EP-NMRV090
General Specifications
| Parameter | Specification |
|---|---|
| Model Number | EP-NMRV090 |
| Centre Distance | 90 mm |
| Max Output Torque | 5000 Nm |
| Reduction Ratios | 7.5–100:1 |
| Input Bore Diameter | 24 / 28 mm |
| Output Shaft Diameter | 45 mm |
| Compatible IEC Flanges | 80B14, 90B14, 100B14, 112B14, 112B5 |
| Max Recommended Input Power | 0.75 kW |
| Input Shaft Radial Load (Fri max) | 8180 N |
| 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, ~1.5 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 | ~16 kg |
| Mounting Positions | B3, B6, B7, B8, V5, V6 |
| Output Configurations | Solid shaft / Double shaft (DZ) / Output flange (FL) |
| Standards | ISO 9001, CE marking, IEC 60034 motor compatibility |
Performance Selection Data (1,400 rpm Input)
| Ratio (i) | Output Speed (r/min) | Output Torque (Nm) | Input Power (kW) |
|---|---|---|---|
| 10:1 | 140 | 3750 | 0.75 |
| 15:1 | 93 | 4160 | 0.75 |
| 20:1 | 70 | 4420 | 0.75 |
| 25:1 | 56 | 4865 | 0.75 |
| 30:1 | 47 | 5241 | 0.75 |
| 50:1 | 28 | 5799 | 0.75 |
| 60:1 | 23 | 6163 | 0.75 |
Core Features & Benefits
◯Corrosion-Resistant Aluminium Housing
Die-cast A360 aluminium provides inherent corrosion resistance ideal for food processing washdown zones, coastal Australian sites, and humid industrial environments. The baked enamel finish adds UV protection for outdoor installations.
△IEC-Standard Motor Mounting (80B14, 90B14, 100B14, 112B14, 112B5)
Hollow bore input with IEC-standard flange (80B14, 90B14, 100B14, 112B14, 112B5) allows direct coupling to AC motors, servos, and stepper motors without separate adaptors, reducing installation time and eliminating alignment problems.
◆Superior Thermal Dissipation
Aluminium’s thermal conductivity (~160 W/m·K) dissipates heat up to 3× faster than cast iron, keeping operating temperatures lower and extending lubricant and seal life in enclosed machine cabinets.
■Six Mounting Positions + Three Output Options
B3, B6, B7, B8, V5, V6 mounting positions combined with solid shaft, double shaft (DZ), and output flange (FL) configurations give machine designers complete layout freedom.
▶Static Self-Locking at High Ratios
At ratios ≥ 40:1, worm geometry provides static self-locking, preventing back-drive under static load without an external brake — simplifying gate actuators, lift platforms, and positioning systems.
●Long Service Life: ≥20,000 Hours L10
Ground worm shafts, precision-hobbed phosphor bronze wheels, and preloaded bearings ensure consistent gear mesh throughout service life, delivering minimum L10 bearing life of 20,000 hours at rated load.
EP-NMRV090 vs Traditional Cast Iron Worm Gearbox
Australian and international machine builders consistently choose aluminium worm gearboxes for their combination of performance, durability, and total cost of ownership advantages over cast iron alternatives.
| Feature | EP-NMRV090 (Aluminium) | Traditional Cast Iron |
|---|---|---|
| Housing Material | Die-cast aluminium A360 | Grey cast iron GG25 |
| Approx. Weight | ~16 kg | 30–40% heavier |
| Corrosion Resistance | Excellent — inherent Al₂O₃ oxide layer | Requires coating; prone to rust |
| Thermal Conductivity | ~160 W/m·K — superior heat dissipation | ~50 W/m·K — poor heat dissipation |
| Surface Finish | Smooth baked enamel, easy to clean | Rough cast surface, hard to clean |
| Motor Mounting | Integrated IEC flange (no adaptor) | Often needs separate adaptor plate |
| Noise Level | Low — aluminium damps vibration | Higher — cast iron transmits vibration |
| Food Industry Suitability | High — smooth, corrosion-resistant | Low — porous surface, rust risk |
| IP Rating | IP65 shaft seals standard | IP54–55 typical |
| Price / Performance | Excellent — lower total cost of ownership | Higher initial & lifetime cost |
Application Sectors
The EP-NMRV090 is well suited to the following industries and application types, each benefiting from its compact size, corrosion-resistant housing, and reliable torque output.
⚘ Mining Equipment
Suitable heavy duty worm gearbox for mining equipment.
⚙ Crane Drives
Suitable aluminium reducer for crane end carriages.
⚚ Heavy Extruders
Suitable worm gearbox for heavy extruder drives.
⚒ Steel Processing
Suitable worm reducer for steel processing lines.
⚛ Large Industrial Pumps
Suitable worm gearbox for large industrial pumps.
Selection Guide, Mounting Positions & Shaft Configurations
How to Select the Correct Ratio
- Calculate required output torque: M₂ = 9,550 × P (kW) / n₂ (rpm), then multiply by your service factor (fs = 1.0–2.5 depending on daily duty hours and load class).
- Find your ratio: Divide motor speed (typically 1,400 rpm) by required output speed. Select the closest ratio from: 7.5–100:1.
- Confirm torque capacity: The selected ratio’s rated torque must exceed M₂ × fs. If not, step up to the EP-NMRV110.
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 |
Output Shaft Options
Standard output shaft diameter: 45 mm. Input bore: 24 / 28 mm.
45 mm diameter with keyway. Default configuration. Model suffix: none.
Shaft exits both sides for bidirectional power take-off. Model suffix: DZ.
Flanged output for direct bolt-on connection, eliminating shaft coupling. Model suffix: FL.
Frequently Asked Questions — EP-NMRV090
▶ What are typical applications for the EP-NMRV090?
The NMRV090 is engineered for mining conveyor drives, overhead crane end carriages, heavy extruder gearboxes, and large pump drives. It delivers up to 5,000 Nm through a 45 mm output shaft while saving 30–40% weight versus comparable cast iron units.
▶ What motor power range does the EP-NMRV090 support?
Compatible with 0.75–2.2 kW input motors. Supported IEC flanges: 80B14, 90B14, 100B14, 112B14, and 112B5. Maximum input shaft radial load (Fri max) is 8,180 N at standard ratios.
▶ How is the EP-NMRV090 sealed for dusty mining environments?
Standard NBR double-lip output shaft seals and precision-machined housing joints with sealant deliver IP65 protection. For abrasive mining environments, specify upgraded Viton seals for enhanced chemical and heat resistance.
▶ Can the NMRV090 run 24/7 in a water treatment plant?
Yes. For continuous 24-hour uniform-load operation, select fs ≥ 1.6 from the selection chart. The aluminium housing resists humid water treatment environments. Specify synthetic lubricant and enhanced seals for sustained high-moisture conditions.
▶ What is the weight saving versus cast iron for the EP-NMRV090?
At approximately 16 kg, the NMRV090 is 30–40% lighter than a comparable cast iron equivalent. This simplifies installation on elevated structures, crane bridges, and machinery frames where structural load is a design constraint.
▶ What service factor should I use for shock-loaded applications?
For moderate shock loads (Class B, Fa ≤ 3), apply fs ≥ 1.5–2.0. For heavy shock loads (Class C, Fa ≤ 10), apply fs ≥ 2.0–2.5 and consult our engineers to confirm the selected ratio falls within the unit’s torque envelope.
Customer Reviews
★★★★★
“Running EP-NMRV090 units on underground belt conveyor take-up drives. Compact size, heavy torque capacity, and shock-load handling have made these our default choice. Weight saving is a real bonus underground.”
Shane Murphy — Mining Equipment Services
Australia
★★★★★
“Specified on end carriage drives of our overhead cranes. Static self-locking at 50:1 provides excellent load holding between travel commands. Two years and thousands of operating hours without any issues.”
Andreas Müller — Crane Manufacturers AG
Germany
★★★★★
“Installed on gate actuator drives at our desalination facility. Corrosion resistance of the aluminium housing in the salt-air coastal environment has been outstanding. Minimal maintenance required.”
Fatima Al-Rashid — Water Infrastructure Authority
Saudi Arabia
Related Products & Accessories
⚙ Compatible Motors
IEC B5/B14 flange single-phase (230V) and three-phase (380V) AC motors for frames: 80B14, 90B14, 100B14, 112B14, 112B5.
Servo and stepper motors available with input adaptor kits. VFD-compatible motors for variable-speed applications.
⚒ Output Accessories
■ Single solid output shaft (standard)
■ Double bidirectional shaft (DZ)
■ Output flange (FL)
■ Torque arm for torque reaction mounting
■ Dust cover for unused shaft end
◆ Related Series
■ EP-NMRV-E090 — coaxial inline output
■ EP-NRV090 — solid input shaft variant
■ EP-NRV-E090 — solid input, coaxial output
■ EP-NMRV110 — next frame size up
Ready to Order the EP-NMRV090?
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
