Beschrijving
EP-NRV040 Worm Reducer — 75 Nm Shaft-Mount Worm Speed Reducer for Medium Industrial Drives
The EP-NRV040 aluminum worm reducer occupies the medium torque tier of Ever Power’s NRV shaft-mount series — delivering up to 75 Nm of output torque from a housing weighing just 2.1 kg. This torque level covers the broad segment of medium industrial drive applications: grain auger feed systems, medium conveyor belt drives, mixer agitators for semi-viscous food products, and light pump drives in Australian agricultural processing, seafood processing, and grain handling facilities.
The NRV040’s 18 mm H8 output shaft is a key step up from the NRV030 — matching the bore of medium-duty chain sprockets, ANSI No. 50 and No. 60 roller chain sprocket hubs, and small centrifugal pump impellers in the 0.25–0.55 kW motor class. With IEC 71B and 80B input flanges as standard (and NEMA 56C available), the NRV040 accepts a wider range of motors than any smaller NRV unit, covering the most common motor sizes used in Australian agricultural machinery and food processing equipment.
Technical Specifications
| Parameter | Value |
|---|---|
| Model | EP-NRV040 |
| Weight (without motor) | 2.1 kg |
| Gear Ratios | 5, 7.5, 10, 15, 20, 25, 30, 40, 50, 60 |
| Max Output Torque (M2) | Up to 75 Nm |
| Output Speed Range | 23 – 280 rpm (at 1400 rpm input) |
| Output Shaft Dia. (Metric) | 18 mm H8 |
| Output Shaft Dia. (Inch) | 0.75 in (−0.0005) |
| Keyway (output) | 6 × 22.3 mm |
| Housing Material | Die-cast aluminum alloy |
| Worm Wheel Material | Phosphor bronze |
| Mounting Type | Shaft-mount (hollow bore) + torque arm |
| Input Options | IEC 71B, 80B flange / NEMA 56C |
| Torque Arm | K1=118 mm, 12 mm pin dia. |
| Protection Class | IP54 standard |
| Operating Temperature | -10 to +40 deg C |
Dimensional Data — Metric & Inch
| Dimension | Metric (mm) | Inch (in) |
|---|---|---|
| Output Shaft dia. | 18 mm H8 | 0.75 in |
| Keyway (output) | 6 × 22.3 mm | 0.187 × 1.25 in |
| Output Shaft Length | 30 mm | — |
| Torque Arm K1 | 118 mm | 4.65 in |
| Pin Dia. (torque arm) | 12 mm | 0.472 in |
NRV040 vs. NMRV040 — Shaft-Mount vs. Foot-Mount
| Criterion | EP-NRV040 (NRV) | NMRV Foot-Mount |
|---|---|---|
| Mounting Method | Hollow bore on driven shaft ✅ | Foot bracket + shaft coupling |
| Input Shaft | None (motor flange direct) ✅ | Yes (requires coupling) |
| NEMA 56C Acceptance | Yes ✅ | Yes |
| Installation Height | Minimum ✅ | Higher (bracket) |
| Alignment | Not required ✅ | Required |
| Best For | Auger/conveyor shaft-direct ✅ | General industrial use |
Core Features & Engineering Advantages
⚙ 75 Nm from 2.1 kg — 2.7x NRV030
The largest output torque jump in the compact NRV range between adjacent sizes — 75 Nm versus 28 Nm in the NRV030. Covers the full range of medium conveyor, auger, and mixer drives without moving to heavier medium-frame reducers.
🔥 18 mm Output Shaft — Medium Drive Standard
Matches ANSI No. 50 and No. 60 roller chain sprocket bores, medium conveyor roller shafts, and small centrifugal pump impeller hubs — eliminating adapter bushings in the majority of Australian medium industrial drive applications.
📈 IEC 71B/80B + NEMA 56C Input
Covers motors from 0.09 kW (71 frame) to 0.55 kW (80 frame) in IEC standards, plus NEMA 56C for North American motors common in Australian mining OEM equipment. Three input flange options from one housing type.
📝 K1=118 mm Torque Arm
The 118 mm torque arm with 12 mm pin provides positive anti-rotation connection to the machine frame. Longer arm than NRV030 provides lower torque arm reaction force for the same output torque, reducing bracket weld stress in lightweight machine frames.
🌞 Self-Locking from 30:1
Self-locking at ratios of 30:1 and above — driven load cannot back-drive the motor under static conditions. Used in grain auger drive applications where the loaded auger must hold position when the motor is de-energised without a separate holding brake.
Application Scenarios & Industry Suitability
🌿
Grain & Feed Mill Drives
Grain auger feed drives, feed pellet conveyor drives, and hammer mill elevator boot drives — 75 Nm covers the full range of small-to-medium grain handling auger and conveyor applications on Australian farms and feed mills.
🏭
Seafood & Food Processing
Medium conveyor belt drives, fish tray conveyor drives, and continuous belt oven entry drives — IP54 sealing handles regular washdown in Australian seafood processing and food manufacturing facilities.
⚙
Mixer & Agitator Drives
Medium-viscosity food product mixer agitators, sauce and condiment mixing vessel drives, and chemical blending unit drives — 75 Nm handles semi-viscous product without the high inertia start loads that can damage lighter reducers.
📈
Agricultural Machinery
Spreader metering drives, small cultivator gearbox output stage drives, and seeding machine press wheel drives — compact shaft-mount eliminates the foot brackets impractical on weight-sensitive tractor-mounted machinery.
Selection Guide — NRV040 Ratio Selection
- Ratio 5–10: Fast conveyor and auger drives — 140–280 rpm, moderate torque.
- Ratio 15–25: Standard processing drives — 56–93 rpm, 30–55 Nm.
- Ratio 30–60: Slow agitators and metering drives — 23–47 rpm, self-locking above 30:1, up to 75 Nm.
Shaft & Torque Arm Configuration
Output: 18 mm H8 solid shaft with 6×22.3 mm keyway. Inch option: 0.75 in. Hollow bore mounts directly onto driven shaft — specify driven shaft diameter at order. Torque arm K1=118 mm, 12 mm pin. Input: IEC 71B, 80B, or NEMA 56C — specify at order.
Frequently Asked Questions
❓ What output torque does the NRV040 deliver?
Up to 75 Nm at 60:1 ratio with 0.37 kW motor input — approximately 2.7x the NRV030 output. Covers medium conveyor drives, mixer agitators, and auger feed systems in Australian food processing and grain handling facilities.
❓ What is the output shaft diameter of the NRV040?
The NRV040 features an 18 mm H8 output shaft as standard, with a 0.75 in option. Matches medium-duty chain sprocket bores and conveyor roller shafts common in Australian food and grain handling operations.
❓ What input flanges does the NRV040 accept?
IEC 71B and 80B as standard (0.09–0.55 kW motors), plus NEMA 56C for North American motor standards. All connect directly without an additional adaptor plate.
❓ Can the NRV040 be used in outdoor or washdown environments?
Yes — IP54 rated as standard, suitable for outdoor grain handling machinery and food processing washdown environments. IP65 sealing upgrade available on request.
❓ What is the difference between NRV040 and NRV050?
NRV040: 75 Nm, 2.1 kg, 18 mm shaft. NRV050: ~180 Nm, 3.5 kg, 25 mm shaft with significantly higher radial load capacity. Select NRV050 for applications requiring over 75 Nm sustained output.
Customer Reviews
★★★★★
“We use NRV040 reducers on our grain auger feed drives at our feed mill in Toowoomba. The shaft-mount configuration is perfect for our auger screw shafts and saved us significant fabrication time on brackets. Eighteen months continuous, no maintenance needed.”
Andrew Pearson 🇦🇺 — Operations Manager, Feed Mill, Australia
★★★★★
“Installed NRV040 units on medium conveyor belt drives in our seafood processing plant in Da Nang. IP54 sealing handles our regular washdown without issues. Very impressed with build quality.”
Bui Thi Lan 🇳🇧 — Production Manager, Seafood Processing, Vietnam
★★★★½
“Used NRV040 on mixer agitator drives in our food production facility in Tehran. 75 Nm output is more than adequate for our medium-viscosity product blending. The 18 mm shaft matched our agitator exactly.”
Reza Ahmadi 🇮🇷 — Process Engineer, Food Production Co., Iran
Compatible Accessories & Related Products
🔌
IEC 71B/80B Motor Adaptors
Direct motor mounting flanges for 0.09–0.55 kW motors in 71 and 80 frame — covers the most common motor sizes used in Australian agricultural machinery and food processing equipment.
🔨
Torque Arm (K1=118 mm)
Standard torque arm for NRV040 — 12 mm pin dia., M12 weld-on pin brackets. Longer arm than NRV030 reduces bracket weld stress in lightweight machine frames.
🔃
NRV050 Upgrade
For applications requiring over 75 Nm, the NRV050 provides up to ~180 Nm in the same shaft-mount configuration with a 25 mm output shaft.
⚙
NMRV040 Foot-Mount Variant
If foot-mount installation is preferred, the NMRV040 provides the same gear ratio and torque range with a standard base and input shaft and four NEMA flange options (FA–FD).
Specify the EP-NRV040 for Your Medium Industrial Drive
Application support for ratio selection, driven shaft sizing, and torque arm configuration for Australian agricultural, food processing, and OEM industry customers.
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