Beschreibung
EP-NMRV075 Worm Gearbox — High-Torque Drive for Mining Ancillary & Heavy Agriculture
The EP-NMRV075 aluminum worm gearbox represents the upper tier of the compact NMRV series — delivering the kind of sustained torque previously reserved for heavy cast iron reducers, yet doing so at a fraction of the weight. At 9 kg, the NMRV075 produces output torques reaching 750 Nm and supports radial loads up to 6,603 N on its output shaft, making it capable of driving loaded belt conveyors, heavy rotary screens, auger drives on large combine harvesters, and water infrastructure pumping systems in remote Australian locations where maintenance access is limited.
A key differentiator for the NMRV075 within the series is its acceptance of three NEMA input flange standards — 56C, 140TC, and the larger 180TC — covering motor outputs from 0.37 kW up to 2.2 kW. This unprecedented motor compatibility in a compact aluminum housing makes the NMRV075 a genuinely versatile worm gear reducer for Australian OEM machinery builders who must accommodate both fractional-horsepower and integral-horsepower motors across their product range.
Technical Specifications
| Parameter | Value |
|---|---|
| Model | EP-NMRV075 |
| Weight (without motor) | 9 kg |
| Gear Ratios | 7.5, 10, 15, 20, 25, 30, 40, 50, 60, 80, 100 |
| Max Input Power (P1) | Up to 2.2 kW |
| Max Output Torque (M2) | Up to 750 Nm |
| Output Speed Range | 14 – 186.7 rpm (at 1400 rpm input) |
| Max Radial Load Fr2 | Up to 6,603 N |
| Housing Material | Die-cast aluminum alloy |
| Worm Wheel Material | Phosphor bronze |
| Output Shaft Dia. (Metric) | 28 mm H8 (35 mm on request) |
| Output Shaft Dia. (Inch) | 1.250 in (-0.0005) |
| Keyway (metric 28 mm) | 8 x 31.3 mm |
| Input Shaft Dia. (Metric) | 24 j6 mm |
| NEMA Input Flanges | 56C, 140TC, 180TC |
| Output Flange Options | FA, FB |
| Mounting Options | Foot (NMRV), Shaft (NRV), Flange |
| Protection Class | IP54 standard |
| Operating Temperature | -10 to +40 deg C |
Dimensional Data — Metric & Inch
| Dimension | Metric (mm) | Inch (in) |
|---|---|---|
| Centre Height (A) | 120 | 4.72 |
| Centre Distance (I) | 75 | — |
| Output Shaft dia. | 28 mm H8 | 1.250 in |
| Input Shaft dia. | 24 j6 mm | 0.875 in |
| Keyway (output) | 8 x 31.3 mm | 0.25 x 2.25 in |
| Output Shaft Length | 60 mm | — |
| Flange Mount BK | 95 mm | 3.740 in |
Core Features & Engineering Advantages
⚙ Three NEMA Input Standards
Accepts NEMA 56C (0.625 in), 140TC (0.875 in), and 180TC (1.125 in) input flanges. This covers AC motors from 0.37 kW up to 2.2 kW in a single housing size — the widest motor compatibility range available in the NMRV compact series.
🔥 750 Nm Continuous Torque at 9 kg
Delivering 83 Nm/kg specific torque, the NMRV075 matches the output of typical 20–25 kg cast iron reducers in this torque class. For Australian mining and agricultural OEMs, this translates to lower shipping costs and simpler installation — especially in remote site applications accessed via light vehicles.
📈 6,603 N Output Radial Load
The highest radial load rating in the compact NMRV range (NMRV025–075). Supports direct chain sprocket mounting for 1-inch pitch roller chain — common in grain handling and aggregate conveyor systems across regional Australia — without an intermediate bearing housing.
🌞 All-Orientation Lubrication Design
Strategically positioned fill, drain, and breather ports allow correct oil level maintenance in all four primary mounting orientations. In agricultural equipment that is regularly repositioned between seasons, this flexibility eliminates the need for oil drain and refill between orientation changes.
💧 Double-Lip Seal — IP54 Standard
Double-lip NBR shaft seals on both input and output shafts prevent oil egress and dust ingress — important for grain dust environments in Australian agricultural applications and for dusty belt-conveyor headhouse environments in quarrying operations.
Application Scenarios & Industry Suitability
⛩
Mining Ancillary Equipment
Rotary screen drives, transfer conveyor tail-end drives, and dewatering screw drives — high radial load capacity withstands the vibration and impact loads of quarrying environments.
🌾
Large Agricultural Machinery
Combine harvester auger drives, silage cutter drive heads, and round baler pickup drives — three NEMA input flange options accommodate the range of PTO-connected motors used in modern farm equipment.
🏛
Water Infrastructure
Slow-speed irrigation pump actuators, weir gate drives, and sluice gate operators — the NMRV075’s self-locking characteristic at high ratios secures gate position without brakes when power is removed.
💧
Heavy Conveyor Systems
Loaded inclined belt conveyors in grain terminals, bulk material ports, and recycling facilities — 750 Nm handles starting torque peaks in fully loaded belt systems.
Selection Guide & Shaft Configuration
- Ratio 7.5–15: High-speed conveyor and screen drives — 93–186 rpm output.
- Ratio 20–50: Heavy belt conveyors, agricultural equipment — 28–70 rpm, maximum load handling.
- Ratio 60–100: Gate and valve actuators, slow positioning — 14–23 rpm, self-locking operation.
Shaft & Input Configuration Details
Output: 28 mm H8 solid shaft with 8×31.3 mm keyway and M10 threaded end (35 mm option on request). Hollow bore available. Inch option: 1.250 in shaft with 0.25×2.25 in keyway. Input: specify NEMA 56C, 140TC, or 180TC flange at order. Two output flange variants (FA, FB) with pilot diameters 100–130 mm.
Aluminum vs. Cast Iron — NMRV075 Performance Comparison
| Criterion | EP-NMRV075 (Aluminum) | Cast Iron Equivalent |
|---|---|---|
| Unit Weight | 9 kg ✅ | 20–28 kg |
| NEMA Flange Options | 56C, 140TC, 180TC ✅ | Usually one |
| Radial Load Capacity | 6,603 N ✅ | Similar, much heavier |
| Corrosion Resistance | High (powder coat) ✅ | Low (rusts) |
| Heat Dissipation | Excellent ✅ | Poor |
| Remote-Site Installation | One-person install ✅ | Crane or two-person |
Frequently Asked Questions
❓ What is the maximum output torque of the EP-NMRV075?
Up to 750 Nm at 100:1 ratio with 2.2 kW input — suitable for loaded belt conveyors, large agricultural auger drives, and heavy rotary screen drives exceeding the NMRV063’s 500 Nm capacity.
❓ What NEMA motor flanges does the NMRV075 accept?
56C (0.625 in), 140TC (0.875 in), and 180TC (1.125 in) — covering 0.37–2.2 kW motors. The widest motor compatibility in the compact NMRV series.
❓ Can the NMRV075 be used for water authority gate actuator drives?
Yes — self-locking above 40:1 holds gate/valve position without a brake. Widely used in Australian irrigation infrastructure for weir and sluice gate actuators.
❓ What is the difference between the NMRV075 and NMRV090?
NMRV075: 750 Nm, 9 kg. NMRV090: ~1,000 Nm, 13 kg with 35 mm primary output shaft and higher radial load. Select NMRV090 for applications above 750 Nm.
❓ Is the NMRV075 available for shaft-mount (NRV) configuration?
Yes — NRV075 slides directly onto the driven shaft secured with a K1=200 mm torque arm. Popular for conveyor drum drive retrofits and agricultural tail-end drives.
Customer Reviews
★★★★★
“Installed EP-NMRV075 on our grain terminal belt conveyor drives in Port Hedland. Three NEMA input flange options matched our existing motor inventory. Eighteen months of heavy-duty operation without a single issue.”
Brett Saunders 🇦🇺 — Operations Manager, Grain Terminal, Australia
★★★★★
“Replaced heavy cast iron reducers on rotary screen drives with EP-NMRV075 units. Weight reduction made the screen structure lighter and easier to service. Output torque fully meets our specification.”
Jakub Novák 🇨🇿 — Plant Engineer, Aggregate Processing, Czech Republic
★★★★½
“Using NMRV075 for irrigation weir gate actuators. Self-locking at 60:1 holds the gate perfectly without brakes. The aluminum housing resists our harsh desert environment well.”
Faisal Al-Rashid 🇸🇦 — Project Manager, Irrigation Infrastructure, Saudi Arabia
Compatible Accessories & Related Products
🔌
IEC B5/B14 Motor Adaptors
IEC 90–112 frame adaptors for three-phase motors 0.75–2.2 kW, including brake motors and high-efficiency IE3 motors.
🔨
NRV075 Torque Arm
K1=200 mm heavy-duty steel torque arm for shaft-mount NRV075 configuration — rated for the high reaction torques encountered in conveyor and agricultural applications.
🔃
Output Flanges (FA, FB)
FA and FB variants with pilot diameters 100–130 mm for direct bolted attachment to conveyor drive pulleys, pump flanges, and agricultural drive hubs.
🔒
Protective Input Cover
Heavy-duty polypropylene cover for outdoor and agricultural installations — resists UV, grain dust, and chemical spray environments common in Australian farming and quarrying.
Source the EP-NMRV075 — Agricultural & Mining Enquiries Welcome
Ever Power supports Australian OEM machinery builders, agricultural equipment manufacturers, and mining ancillary equipment suppliers with competitive pricing and technical application support.
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