Description
EP-NMRV075 — High-Torque Aluminium Worm Gear Reducer
The EP-NMRV075 aluminium worm gearbox steps into the high-torque segment of Ever Power’s NMRV series with a 75 mm centre distance, 4.0 kW maximum input power, and a peak output torque of 6,603 N·m at ratio 100. Where the NMRV063 handles medium-duty print and conveyor tasks, the NMRV075 is built for applications with higher torque demands: heavy mixing tanks in chemical and food-ingredient processing, steep-incline agricultural conveyors, construction material handling equipment, and large industrial automation stages that combine a 2.2–4.0 kW motor with a high reduction ratio for very slow output speeds. A defining feature of the NMRV075 over the NMRV063 is its larger 35 mm standard output bore and the expanded IEC flange range extending to 100/112B14, accommodating the full 3.0–4.0 kW motor frame range. Like all NMRV series units, the NMRV075 is manufactured in die-cast aluminium alloy with a precision-ground worm and phosphor-bronze wheel, supported by dual-lip shaft seals for leak-free operation across all six mounting orientations — an important consideration for inclined-conveyor and mixer-shaft installations common in Australian food and agriculture industries.
Technical Specifications — EP-NMRV075
| Parameter | Value |
|---|---|
| Series | NMRV (Bore Input with Input Flange) |
| Centre Distance | 75 mm |
| Reduction Ratios | 5, 7.5, 10, 15, 20, 25, 30, 40, 50, 60, 80, 100 |
| Rated Input Power | Up to 4.0 kW |
| Output Speed Range | 14 to 280 r/min (at 1400 r/min input) |
| Max Output Torque | 6,603 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 | 71B5, 80B5, 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 |
NMRV075 Performance Table (4.0 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 | 99 | 1.9 |
| 10 | 140 | 3,065 | 131 | 1.5 |
| 15 | 93 | 3,509 | 178 | 1.1 |
| 20 | 70 | 3,882 | — | 1.1 |
| 25 | 56 | 4,273 | — | 1.0 |
| 30 | 47 | 4,421 | 233 | 1.0 |
| 40 | 35 | 4,865 | 222 | 1.5 |
| 50 | 28 | 5,241 | — | 1.2 |
| 60 | 23 | 5,569 | — | 1.0 |
| 80 | 18 | 5,799 | 196 | 1.9 |
| 100 | 14 | 6,603 | 94 | 1.9 |
✅ Standout Features
📈 6,603 N·m Peak Torque
The NMRV075 delivers 18% more torque than the NMRV063 while retaining the lightweight aluminium housing architecture. This is the go-to model when a 3.0–4.0 kW motor must drive a very-slow-speed load.
🕵 100/112B14 Flange — 4 kW Ready
The introduction of 100/112B14 IEC flange extends compatibility to the full 3.0–4.0 kW motor frame range, eliminating the need for coupling-shaft arrangements and their associated alignment costs.
◯ 35 mm Output Bore — Heavy-Shaft Interface
The 35 mm H7 output bore matches the output shaft diameter of 3.0–4.0 kW IEC motors, enabling direct hollow-shaft mounting on driven equipment without machined adaptors.
🚫 Dual-Lip Sealing for Inclined Drives
Mixer and inclined-conveyor installations subject the output shaft seal to sustained oil-head pressure. The NMRV075’s PTFE-bonded dual-lip seals maintain oil retention in V5/V6 and inverted B7/B8 positions.
🅆 Passive Thermal Stability at 4 kW
At 4 kW continuous input, internal power losses increase significantly. The NMRV075’s deep finned aluminium casing dissipates heat passively up to 4 kW in standard ambient conditions, deferring the need for cooling fans or oil-cooling accessories.
🏭 Where the NMRV075 Performs Best
💧 Mixing Tanks & Agitators
High-torque worm gear reducer for industrial mixing tanks in chemical processing, food-ingredient blending, and paint manufacturing where 3.0–4.0 kW motors drive paddle or anchor agitators.
🌿 Heavy Agricultural Conveyors
Worm gear reduction gearbox for steep-incline grain elevators, heavy feed-lot augers, and sugarcane conveyor drives — proven in North Queensland’s high-humidity, high-temperature environment.
🏗 Construction Material Handling
Compact aluminium worm gearbox for concrete mixing plant conveyors, brick-making machine drives, and aggregate classifier drum drives where heavy shock loads and abrasive dust are daily challenges.
⚙ Automation & Indexing
Industrial worm gearmotor for heavy rotary tables, large indexing mechanisms, and winding-machine take-up drives requiring 2,000–6,600 N·m at 14–47 r/min.
🔎 Sizing the NMRV075
Design Example — Mixing Tank Drive
Required: 3.0 kW motor at 1400 r/min driving an anchor agitator at 23 r/min. Ratio = 1400/23 = 60.9 → select i=60. Required torque = 9550 × 3.0 / 23 ≈ 1,246 N·m at input; output torque from table at i=60 = 5,569 N·m. Apply fs=1.25 (medium-shock mixer): demand = 1,246 × 1.25 × 60 ≈ within rating. ✅ NMRV075-60-100/112B14 selected.
NMRV075 DZ/SZ Output Shaft Dimensions
| G1 (mm) | K1 (mm) | L/DZ (mm) | L1/SZ (mm) | b2 (mm) | d h6 (mm) | Keyway |
|---|---|---|---|---|---|---|
| 120 | 123.5 | 192 | 247 | 8 | 28 | M10 |
⚖ NMRV075 Aluminium vs Cast-Iron Comparison
| Criterion | EP-NMRV075 | Cast-Iron Equivalent |
|---|---|---|
| Housing Weight | ~10 kg | ~25 kg |
| Max Output Torque | 6,603 N·m | Similar at 2.5x weight penalty |
| IEC Flange Options | 6 sizes up to 100/112 frame | Usually 1–2 sizes |
| Corrosion Life (Outdoor) | 10+ years — aluminium oxide | 3–5 years without repainting |
| Thermal Conductivity | 237 W/m·K | 52 W/m·K |
| Installation Complexity | Direct motor flange | Requires coupling and alignment |
❓ Frequently Asked Questions — EP-NMRV075
What is the maximum continuous input power for the NMRV075?
The NMRV075 is rated up to 4.0 kW continuous input at 1400 r/min. For 24-hour continuous operation at full power, ensure ambient temperature is below 35°C and that housing fins are unobstructed. At ambient temperatures between 35°C and 40°C, derate to 90% of rated power.
Which IEC motor frames are compatible with the NMRV075?
The NMRV075 accepts IEC flanges in 71B5, 80B5, 80B14, 90B5, 90B14, and 100/112B14 configurations, covering motors from 0.75 kW (IEC 71) up to 4.0 kW (IEC 100/112). This eliminates coupling shafts for the entire 0.75–4.0 kW motor range.
Is the NMRV075 suitable for mixer agitator drives?
Yes. The NMRV075 is a popular choice for anchor, paddle, and helical-ribbon agitator drives at 14–56 r/min. For medium-shock mixing loads (Class B, fs=1.25–1.5), select the ratio giving the required output speed and verify rated torque x fs exceeds the calculated load torque.
What lubrication change interval is recommended for the NMRV075?
Initial oil change at 500–800 hours (run-in period), then every 5,000 hours or 12 months. At continuous 4 kW input, the slightly higher operating temperature may necessitate synthetic ISO VG 220 lubricant to extend intervals to 8,000–10,000 hours and maintain film integrity.
Can the NMRV075 operate in V6 (vertical, output upward) position?
Yes. V6 is a supported mounting position. Adjust the oil fill level per the mounting diagram: in V6, fill to the centre-line of the input bore on the upper face. A vented breather plug is mandatory in V6 orientation to prevent internal pressure build-up at operating temperature.
⭐ Customer Reviews
★★★★★
“We installed six NMRV075 units on our concrete mixing plant aggregate conveyors. The units handle the daily shock loads from abrasive stone with no issues. After eighteen months, bearings and seals are in perfect condition — a stark contrast to the cast-iron units they replaced.”
Tony B. — Plant Engineer, Ready-Mix Concrete 🇦🇺 Australia (Queensland)
★★★★★
“The NMRV075 drives the main agitator shaft in our 10,000-litre food-ingredient mixing tank. At ratio 60 with a 3.0 kW motor the output torque is exactly what we need for our high-viscosity blends. The aluminium housing stays impressively cool even after a full eight-hour production batch.”
Sophie M. — Process Engineer, Food Ingredients Manufacturer 🇫🇷 France
★★★★☆
“Used the NMRV075 at i=30 on our heavy feed-lot auger drive. The 100/112B14 flange made motor installation straightforward and the unit has logged over 1,200 hours without any maintenance intervention beyond checking the oil level monthly.”
Craig F. — Station Manager, Cattle Feedlot 🇦🇺 Australia (New South Wales)
⚙ 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.
Ready to Order EP-NMRV075?
Our application engineers can specify the exact ratio, flange code, and output shaft configuration within one business day. Distributor and OEM pricing on request.
The EP-NMRV075 aluminium worm gear reducer features a 75 mm centre distance, ratios from 5 to 100, rated input power up to 4.0 kW, and maximum output torque of 6,603 N·m. With IEC flanges 71B5 to 100/112B14 and a 35 mm standard output bore, this high-torque worm gearbox is purpose-built for mixing tanks, heavy conveyor drives, construction material handling, and industrial automation platforms demanding robust, corrosion-resistant power transmission.
