Description
EP-NMRV090 — Heavy Industrial Aluminium Worm Gear Reducer
The EP-NMRV090 represents a significant power and torque step in Ever Power’s NMRV aluminium worm gearbox range. With a 90 mm centre distance and maximum input power of 5.5 kW, it delivers up to 7,306 N·m output torque — 10.6% more than the NMRV075 — while retaining the same die-cast aluminium housing benefits of lightweight construction, excellent corrosion resistance, and passive heat dissipation via a deeply finned casing. The NMRV090 is the benchmark choice for industrial mixing applications involving high-viscosity fluids, heavy sludge thickeners in municipal water treatment, large-format conveyor drives in mining and quarrying operations, and high-torque automation stages where a 4.0–5.5 kW motor must reduce to very low output speeds. The extended IEC flange range (80B14 through 100/112B14) and the enlarged 35 mm standard output bore ensure the NMRV090 integrates directly with standard motors without intermediate shafting — a critical time and cost saving for Australian plant and project engineers working on tight commissioning schedules.
Technical Specifications — EP-NMRV090
| Parameter | Value |
|---|---|
| Series | NMRV (Bore Input with Input Flange) |
| Centre Distance | 90 mm |
| Reduction Ratios | 5, 7.5, 10, 15, 20, 25, 30, 40, 50, 60, 80, 100 |
| Rated Input Power | Up to 5.5 kW |
| Output Speed Range | 14 to 280 r/min (at 1400 r/min input) |
| Max Output Torque | 7,306 N·m |
| Housing Material | Die-cast aluminium alloy |
| Worm Wheel Material | Phosphor bronze |
| Worm Shaft Material | 20CrMnTi alloy steel, case hardened, precision ground |
| IEC Input Flanges | 80B14, 90B5, 90B14, 100/112B14 |
| Output Bore Diameter | 35 mm standard (H7 with keyway) |
| Lubrication | ISO VG 220 gear oil (factory filled) |
| Mounting Positions | B3, B6, B7, B8, V5, V6 |
| Protection Class | IP54 |
| Ambient Temperature | -10°C to +40°C |
NMRV090 Performance Table (5.5 kW / 1400 r/min)
| Ratio (i) | Output Speed (r/min) | Output Torque (N·m) | Radial Load (N) | Service Factor (fs) |
|---|---|---|---|---|
| 7.5 | 187 | 2,785 | — | 1.9 |
| 10 | 140 | 3,065 | — | 1.5 |
| 15 | 93 | 3,882 | — | 1.2 |
| 20 | 70 | 4,273 | — | 1.1 |
| 25 | 56 | 4,603 | 304 | 1.1 |
| 30 | 47 | 4,891 | 351 | 1.2 |
| 40 | 35 | 5,383 | — | 1.5 |
| 50 | 28 | 5,799 | — | 1.4 |
| 60 | 23 | 6,163 | — | 1.2 |
| 80 | 18 | 6,783 | — | 1.1 |
| 100 | 14 | 7,306 | 302 | 0.9 |
✅ Core Features for Heavy Industrial Use
📈 7,306 N·m Torque Output
The NMRV090 is the highest-torque aluminium worm gearbox in the NMRV series before moving to the larger 110 frame. At 7,306 N·m it handles industrial sludge thickeners, heavy mixer shafts, and quarry conveyor drives that would previously have required a cast-iron unit.
🕵 Broad 5.5 kW Motor Compatibility
Four IEC flange options (80B14, 90B5/B14, 100/112B14) cover the full 1.5–5.5 kW motor range, enabling direct motor-to-gearbox assembly and eliminating coupling shafts on high-power drives.
◯ Precision-Ground Worm Pair
At 5.5 kW input the worm-gear mesh experiences significant contact forces. Ever Power’s hardened and ground 20CrMnTi worm shaft paired with a high-tin phosphor-bronze wheel maintains low backlash and high efficiency across the full service life.
🌞 Sustained Thermal Management
The NMRV090’s housing is engineered with increased fin depth and width relative to the NMRV075 to manage the higher heat generation at 5.5 kW input during continuous industrial duty cycles.
🚫 Omni-Position Leak-Free Sealing
PTFE-bonded dual-lip shaft seals are rated for sustained oil-splash pressure at 5.5 kW, ensuring oil-tight performance in all six mounting positions — including the V5/V6 vertical orientations used on mixing tank top-entry drives.
🏭 Industry Applications
💧 Water & Wastewater Treatment
Heavy-duty worm gear reducer for municipal sludge thickener drives, belt-filter press rollers, and slow-speed aeration paddle drives where 4.0–5.5 kW at 14–47 r/min is the standard demand.
⚙ Industrial Mixing & Agitation
High-torque aluminium worm gearbox for large-volume chemical reactors, bitumen blending tanks, and heavy-viscosity food-processing mixers requiring continuous torque above 5,000 N·m.
🍲 Mining & Quarry Conveyors
Worm gear reduction gearbox for underground conveyor take-up drives, quarry screen feeders, and aggregate conveyor tail-end drives where shock loads and abrasive dust are constant operating challenges.
📥 Textile & Paper Handling
Corrosion-resistant worm gearmotor for paper-machine rewinder drives, large roll-press nip drives, and textile winding machinery requiring precise low-speed torque with minimal backlash.
🔎 NMRV090 Specification & Sizing
Design Example — Sludge Thickener Drive
Required: 5.5 kW motor at 1400 r/min driving a thickener rake at 18 r/min (i=80). Output torque from table = 6,783 N·m. For Class B medium-shock load, fs=1.3: demand = 6,783 / 1.3 = 5,218 N·m — well within rating. Select NMRV090-80-100/112B14. ✅
NMRV090 Output Shaft Dimensions
| Parameter | DZ (Single Shaft) | SZ (Double Shaft) |
|---|---|---|
| G1 (mm) | 140 | 140 |
| K1 (mm) | 154.5 | 154.5 |
| L (mm) | 234 | 309 |
| b2 (mm) | 10 | 10 |
| d h6 (mm) | 35 | 35 |
| Keyway m | M12 | M12 |
⚖ NMRV090 vs Cast-Iron Heavy-Duty Reducers
| Feature | EP-NMRV090 (Aluminium) | Cast-Iron Heavy-Duty Reducer |
|---|---|---|
| Approximate Weight | ~14 kg | ~35 kg |
| Max Output Torque | 7,306 N·m | Similar at 2.5x weight |
| Input Power | 5.5 kW direct flange | 5.5 kW with coupling required |
| Corrosion Resistance | Aluminium oxide — 10+ yr outdoor | Needs annual repainting |
| Thermal Conductivity | 237 W/m·K | 52 W/m·K |
| Mounting Flexibility | 6 positions | Typically 1–2 positions |
❓ Frequently Asked Questions — EP-NMRV090
How does the NMRV090 compare to the NMRV075 in performance?
The NMRV090 raises max output torque from 6,603 to 7,306 N·m (a 10.6% increase) and raises max input power from 4.0 to 5.5 kW. The larger 90 mm centre distance also improves radial load capacity, making the NMRV090 the preferred choice when a 4.0–5.5 kW motor is required.
What is the standard output shaft diameter of the NMRV090?
The standard hollow output bore is 35 mm H7 with a 10 mm keyway. The DZ solid shaft is also 35 mm h6 with an M12 key, matching the output shaft diameter of IEC 90–100 frame motors for direct hollow-shaft mounting on driven equipment.
Is the NMRV090 suitable for sludge thickener drives in water treatment plants?
Yes. The NMRV090 is widely used in municipal sludge thickeners at 14–25 r/min, typically with a 4.0 or 5.5 kW motor at ratio 60–100. The aluminium housing resists the chlorinated, hydrogen-sulphide-laden atmospheres in wastewater treatment better than cast iron.
Can the NMRV090 handle shock loads from mining conveyors?
The NMRV090 is rated for Class B medium-shock loads (inertia factor Fa ≤ 3) as standard. For Class C heavy-shock mining conveyor applications (Fa ≤ 10), increase the service factor to fs = 2.0–2.5 and verify rated torque x fs exceeds the peak shock torque demand.
What is the expected service life of the NMRV090 at full rated power?
Under rated conditions (5.5 kW, 1400 r/min input, 25°C ambient, ISO VG 220 lubricant), the NMRV090 is designed for L10 bearing life of 20,000+ hours. Worm wheel wear is the primary life-limiting factor; phosphor-bronze composition and proper lubrication are key to achieving full design life.
⭐ Customer Reviews
★★★★★
“We replaced eight cast-iron reducers on our municipal wastewater sludge thickeners with NMRV090 units at i=80. The weight reduction alone saved us three hours of crane time per installation. Eighteen months of continuous operation — no seal failures, no corrosion, no oil changes needed yet.”
James S. — Maintenance Engineer, Water Corporation 🇦🇺 Australia (Western Australia)
★★★★★
“Our bitumen blending tanks run NMRV090 at ratio 60 with 5.5 kW motors. The unit handles the high-viscosity start-up torque without complaint and the gearbox temperature stays well within safe limits throughout the eight-hour heating and blending cycle.”
Hendrik V. — Production Manager, Road Surfacing Products 🇸🇦 South Africa
★★★★☆
“We use ten NMRV090 units on quarry aggregate conveyor drives. They replaced much heavier cast-iron units and our maintenance team reports the IEC flange system has cut motor replacement time from two hours to under thirty minutes.”
Rob C. — Operations Director, Aggregate Quarry 🇫🇯 Finland
⚙ Accessories & Compatible Products
⚡ IEC Motors (B5/B14)
Standard single-phase and three-phase AC motors with matching IEC flange. VFD inverter-duty versions available for variable-speed control.
🔗 Output Shaft Kits
Single solid (DZ), double-ended (SZ), output flange (F), hollow flange (FL) — all to H7/h6 tolerance with standard keyways.
🔨 Torque Arms & Brackets
Steel torque reaction arms for shaft-mount configurations; foot-mounting plates for B3/B6 orientations.
🔒 Seal & Breather Kits
Replacement lip-seal kits, vented breather plugs, and magnetic drain plugs for extended service intervals.
Enquire About EP-NMRV090 Supply
From single-unit retrofit projects to container-load OEM supply, our team is ready to assist with specification, pricing, and technical support worldwide.
The EP-NMRV090 aluminium worm gear reducer has a 90 mm centre distance, ratios from 5 to 100, rated input power up to 5.5 kW, and maximum output torque of 7,306 N·m. IEC flanges 80B14 through 100/112B14 are directly supported. This heavy industrial worm gearbox delivers class-leading torque in a corrosion-free aluminium housing, suited to industrial mixing, heavy conveyor systems, water treatment drives, and large-scale automation across Australia.
