Description
EP-NMRV110 — Large-Frame Aluminium Worm Gear Reducer for Demanding Drives
The EP-NMRV110 aluminium worm gearbox is designed for industrial environments where neither weight savings nor output torque can be compromised. With a 110 mm centre distance and maximum input power of 7.5 kW, it generates up to 9,232 N·m output torque — the highest in the standard NMRV range before the NMRV130 — while keeping the housing weight at approximately 22 kg, roughly 40% lighter than equivalent cast-iron units. This combination makes the NMRV110 the benchmark reducer for large municipal sludge handling systems, heavy chemical mixing reactors, quarry and mining conveyor drives, marine deck equipment, and large-scale industrial automation stages. Unlike smaller NMRV units which accept up to IEC 112 motors, the NMRV110 extends IEC flange compatibility to 132B5, covering the complete 5.5–7.5 kW motor frame range and eliminating the need for intermediate couplings on high-power, high-torque drive trains. The NMRV110 also features the largest standard output bore (42 mm) in the sub-NMRV130 range, matching the output shaft diameter of IEC 112–132 motors for direct hollow-shaft mounting.
Technical Specifications — EP-NMRV110
| Parameter | Value |
|---|---|
| Series | NMRV (Bore Input with Input Flange) |
| Centre Distance | 110 mm |
| Reduction Ratios | 5, 7.5, 10, 15, 20, 25, 30, 40, 50, 60, 80, 100 |
| Rated Input Power | Up to 7.5 kW |
| Output Speed Range | 14 to 280 r/min (at 1400 r/min input) |
| Max Output Torque | 9,232 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 | 90B5, 90B14, 100/112B5, 100/112B14, 132B5 |
| Output Bore Diameter | 42 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 |
NMRV110 Performance Table (7.5 kW / 1400 r/min)
| Ratio (i) | Output Speed (r/min) | Output Torque (N·m) | Radial Load (N) | Service Factor (fs) |
|---|---|---|---|---|
| 7.5 | 187 | 2,359 | — | 2.6 |
| 10 | 140 | 2,597 | — | 2.0 |
| 15 | 93 | 2,973 | — | 1.5 |
| 20 | 70 | 3,272 | — | 1.1 |
| 25 | 56 | 3,509 | — | 1.1 |
| 30 | 47 | 3,745 | — | 1.1 |
| 40 | 35 | 4,285 | 352 | 1.9 |
| 50 | 28 | 4,905 | — | 1.4 |
| 60 | 23 | 5,399 | — | 1.4 |
| 80 | 18 | 5,816 | — | 1.2 |
| 100 | 14 | 9,232 | 473 | 1.5 |
✅ Defining Features of the NMRV110
📈 9,232 N·m — Highest NMRV Output Torque
The NMRV110 reaches 9,232 N·m at ratio 100 — the highest in the standard NMRV range before the NMRV130. This enables single-stage reduction drives that would otherwise require a two-stage gearbox, reducing cost, complexity, and footprint.
🕵 IEC 132B5 Compatibility
By extending flange support to IEC 132B5, the NMRV110 accepts the largest standard motor frame (7.5 kW) without a coupling shaft, a unique advantage in the aluminium worm gearbox category that eliminates alignment labour and coupling wear.
◯ 42 mm Output Bore
The 42 mm H7 hollow output bore is the largest in the sub-NMRV130 aluminium worm gearbox range, matching IEC 112–132 output shaft diameters for direct hollow-shaft mounting on driven pulleys, sprockets, and agitator shafts.
⛁ Robust Worm Gear Pair for 7.5 kW
The 20CrMnTi worm shaft is case hardened to HRC 58–62 and precision ground to ensure the mesh can handle the elevated contact pressures generated at 7.5 kW input without accelerated wear of the phosphor-bronze wheel.
🚫 IP54 Sustained at 7.5 kW
At 7.5 kW continuous, shaft speeds and internal pressures are at the NMRV series maximum for aluminium housings. The NMRV110’s reinforced lip seal specification and ribbed housing design maintain IP54 protection rating throughout the design life.
🏭 Application Sectors
💧 Municipal Sludge Handling
Large-frame worm gear reducer for primary sludge thickeners, centrifuge feed pumps, and anaerobic digester mixer drives at 14–30 r/min requiring 6,000–9,000 N·m continuous output torque.
⚙ Heavy Chemical Reactors
High-torque aluminium worm gearbox for glass-lined reactor agitator drives, rubber compound kneading machinery, and resin polymerisation tank mixers where 7.5 kW at high ratio delivers the required mixing energy.
🍲 Mining & Quarry Drives
Worm gear reduction gearbox for underground coal conveyor tail-end drives, quarry crusher feeder conveyors, and ore-screening machine drives subject to heavy shock loading.
🚢 Marine & Port Equipment
Corrosion-resistant aluminium worm gearmotor for ship deck crane slewing drives, port grain unloader conveyors, and dry-bulk terminal stacker/reclaimer pivot drives.
🔎 NMRV110 Selection & Shaft Dimensions
Design Example — Chemical Reactor Drive
Required: 7.5 kW motor at 1400 r/min driving a glass-lined reactor anchor at 18 r/min. i = 1400/18 = 77.8 → select i=80. Output torque from table = 5,816 N·m. For medium-shock reactor load fs=1.25: demand = 5,816/1.25 = 4,653 N·m — within rating. ✅ NMRV110-80-132B5 selected.
NMRV110 DZ/SZ Output Shaft Dimensions
| G1 (mm) | K1 (mm) | L/DZ (mm) | L1/SZ (mm) | b2 (mm) | d h6 (mm) | Keyway |
|---|---|---|---|---|---|---|
| 155 | 162 | 249 | 324 | 12 | 42 | M16 |
⚖ NMRV110 vs Cast-Iron Large-Frame Reducers
| Feature | EP-NMRV110 (Aluminium) | Cast-Iron Equivalent |
|---|---|---|
| Approximate Weight | ~22 kg | ~56 kg |
| Max Output Torque | 9,232 N·m | Similar at 2.5x weight |
| IEC Motor Range | 90B5 to 132B5 — 5 flange sizes | Typically 2 sizes |
| Corrosion Life | 10+ years without repainting | 3–5 years outdoors |
| Thermal Conductivity | 237 W/m·K | 52 W/m·K |
| Output Bore | 42 mm H7 — direct shaft mount | Often requires machined adaptor |
❓ Frequently Asked Questions — EP-NMRV110
How does the NMRV110 differ from the NMRV090?
The NMRV110 raises max output torque from 7,306 to 9,232 N·m (a 26% increase) and input power from 5.5 to 7.5 kW. The NMRV110 also extends IEC flange support to 132B5 and increases the output bore to 42 mm from 35 mm in the NMRV090.
What is the maximum continuous duty cycle for the NMRV110?
The NMRV110 is rated for continuous 24-hour duty at the published rated torque and power, provided ambient temperature is 25°C or below. Between 25°C and 40°C, apply a 0.9 derating factor to input power. For ambient temperatures above 40°C, consult our engineering team for synthetic lubricant selection and possible fin-cooler recommendations.
Is the NMRV110 suitable for marine deck applications?
Yes, with the appropriate specification. For marine use, specify the optional stainless steel output shaft (316L grade), marine-grade electrostatic topcoat, and synthetic ISO VG 220 synthetic gear oil to provide protection against salt-spray ingress and extended lubricant change intervals at sea.
What is the output bore tolerance for the NMRV110?
The standard hollow output bore is 42 mm H7 (tolerance +0.025/0 mm) with a 12 mm keyway. The DZ solid shaft is 42 mm h6 with an M16 key. For driven shafts with a j6 or k6 tolerance, an interference fit to the hollow bore is achievable without heating.
Does the NMRV110 require an external oil cooler at 7.5 kW continuous?
Under standard conditions (25°C ambient, unobstructed fins), the NMRV110’s aluminium casing dissipates the generated heat passively at 7.5 kW continuous. Above 30°C ambient or in enclosed plant rooms with limited airflow, a directed 0.5 m/s airflow over the housing fins is recommended; an external oil cooler is only required above 40°C ambient.
⭐ Customer Reviews
★★★★★
“Twelve NMRV110 units drive the sludge rake mechanisms in our new municipal wastewater treatment plant. The weight saving compared to the cast-iron units in our old facility made overhead crane installation far quicker. Two years into operation and not a single unit has required unplanned maintenance.”
Emily C. — Asset Manager, Metropolitan Water Authority 🇦🇺 Australia (Victoria)
★★★★★
“We run NMRV110 at i=100 driving a glass-lined polymerisation reactor. The 9,232 N·m torque rating gives us a comfortable 40% safety margin on start-up torque for high-viscosity polymer. The gearbox has run flawlessly for over 3,000 hours on synthetic lubricant.”
Dr. Klaus W. — Chemical Process Engineer, Polymer Manufacturer 🇩🇪 Germany
★★★★☆
“We installed six NMRV110 units on our quarry aggregate feeder conveyors. The aluminium housing resists the dusty, damp quarry environment excellently and the IEC 132B5 flange aligned our 7.5 kW motors perfectly on the first assembly.”
Brendan O. — Maintenance Supervisor, Aggregate Quarry 🇮🇪 Ireland
⚙ 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.
Specify the EP-NMRV110 for Your Project
Our engineering team provides rapid technical support for large-frame gearbox selection, custom shaft options, and volume OEM pricing.
The EP-NMRV110 aluminium worm gearbox features a 110 mm centre distance, ratios from 5 to 100, rated input power up to 7.5 kW, and maximum output torque of 9,232 N·m. IEC flanges 90B5 through 132B5 are directly compatible. This large-frame worm gear reducer handles the most demanding industrial applications — municipal sludge handling, quarry conveyors, heavy chemical agitators, and marine equipment — in a lightweight aluminium housing designed for long service in corrosive environments.
