Deskripsi
EP-NRV075 Worm Reducer — 500 Nm Shaft-Mount Worm Speed Reducer for Large Industrial Drives
The EP-NRV075 aluminum worm reducer is the largest compact-tier unit in the NRV shaft-mount series — delivering up to 500 Nm of sustained output torque from a housing weighing just 9.5 kg. This torque level bridges the gap between medium compact reducers and heavy process industry drives, covering large belt conveyor head drives, heavy agitator vessels, and pump station actuators in Australian mining ancillary, water infrastructure, and heavy agricultural processing facilities. The shaft-mount configuration eliminates the foot bracket, coupling, and alignment procedure required by foot-mount equivalents on these demanding elevated-platform installations.
The NRV075 brings a significant step up in input motor compatibility: acceptance of NEMA 140TC and NEMA 180TC input flanges alongside IEC 100B and 112B covers motors from 0.75 kW to 3.0 kW, including the larger integral-horsepower motors common in Australian mining support and heavy agricultural drives. Combined with a 35 mm H8 output shaft and 5,500 N radial load capacity, the NRV075 is designed to support the largest chain sprockets and V-belt sheaves used in major agricultural processing and conveyor terminal applications without an outboard bearing support.
Technical Specifications
| Parameter | Value |
|---|---|
| Model | EP-NRV075 |
| Weight (without motor) | 9.5 kg |
| Gear Ratios | 7.5, 10, 15, 20, 25, 30, 40, 50, 60, 80, 100 |
| Max Output Torque (M2) | Up to 500 Nm |
| Output Speed Range | 14 – 186.7 rpm (at 1400 rpm input) |
| Max Radial Load Fr2 | Up to 5,500 N |
| Output Shaft Dia. (Metric) | 35 mm H8 |
| Output Shaft Dia. (Inch) | 1.375 in (−0.0005) |
| Keyway (output) | 10 × 38.3 mm |
| Housing Material | Die-cast aluminum alloy |
| Worm Wheel Material | Phosphor bronze |
| Mounting Type | Shaft-mount (hollow bore) + torque arm |
| Input Options | IEC 100B, 112B / NEMA 140TC, 180TC |
| Torque Arm | K1=170 mm, 18 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. | 35 mm H8 | 1.375 in |
| Keyway (output) | 10 × 38.3 mm | 0.313 × 2.0 in |
| Output Shaft Length | 60 mm | — |
| Torque Arm K1 | 170 mm | 6.69 in |
| Pin Dia. (torque arm) | 18 mm | 0.709 in |
| Max Radial Load | 5,500 N | — |
NRV075 vs. NMRV075 — Shaft-Mount vs. Foot-Mount
| Criterion | EP-NRV075 (NRV Shaft-Mount) | NMRV Foot-Mount |
|---|---|---|
| Output Torque | 500 Nm ✅ | 500 Nm |
| Mounting Method | Hollow bore on shaft ✅ | Foot bracket + coupling |
| Radial Load | 5,500 N ✅ | Similar |
| NEMA 180TC Acceptance | Yes ✅ | Yes (unique in NMRV series) |
| Elevated Install | Simpler ✅ | Bracket + crane |
| Coupling Alignment | Not required ✅ | Required |
Core Features & Engineering Advantages
⚙ 500 Nm — Large Industrial Drive Capability
500 Nm from a 9.5 kg shaft-mount reducer covers large grain terminal conveyor head drives, heavy process vessel agitators, and large irrigation pump actuators — applications previously requiring heavy foot-mount gearboxes with dedicated mounting frames and shaft couplings.
🔥 5,500 N Radial Load — Direct Heavy Sprocket Mount
5,500 N radial load capacity supports direct mounting of ANSI No. 100 and No. 120 roller chain sprockets and C-section V-belt sheaves — common in grain terminal conveyor drives and large irrigation pump station drives across rural and regional Australia.
📈 35 mm Heavy-Duty Output Shaft
The 35 mm H8 shaft matches the bore of heavy-duty industrial chain sprockets and the impeller hubs of centrifugal pumps in the 1.5–3.0 kW class — also matching the output shaft dimension of the NMRV090, allowing interchangeability between shaft-mount and foot-mount configurations without driven equipment modification.
📝 NEMA 180TC — 3.0 kW Motor Direct
One of the few compact shaft-mount worm reducers to accept NEMA 180TC input flanges, enabling direct mounting of 2.2–3.0 kW integral-horsepower motors common in Australian mining ancillary and heavy agricultural processing drives without custom adaptor fabrication.
🌞 Self-Locking from 30:1
Inherent self-locking at 30:1 and above eliminates separate load-holding brakes in heavy conveyor tensioner drives, loaded auger hold-position applications, and pump station gate actuators requiring valve position retention on power loss.
Application Scenarios & Industry Suitability
⛩
Grain Terminal & Bulk Handling
Large belt conveyor head drives, grain elevator boot drives, and ship-unloader ancillary belt drives at Australian grain terminals and bulk commodity handling facilities — 500 Nm handles the full load of major agricultural conveyor systems.
🏛
Pump Station & Water Infrastructure
Large pump station gate actuator drives, major irrigation valve actuators, and regional water authority sluice gate operators — self-locking at high ratios holds gate and valve position without additional locking hardware.
⚗
Heavy Industrial Agitation
Large-diameter reactor vessel agitators, heavy mixer drives in fertiliser production, and large polymer blending vessel drives — 500 Nm handles high-viscosity product blending in continuous industrial service.
⛩
Mining Ancillary & Quarrying
Crusher feed conveyor drives, stockpile conveyor belt head drives, and heavy screen drive ancillaries in Australian quarrying and mining support operations — the NRV075 delivers mining-grade torque in a shaft-mount configuration compatible with remote-site installation.
Selection Guide — NRV075 Ratio Selection
- Ratio 7.5–15: Faster conveyor and pump drives — 93–186 rpm, moderate torque.
- Ratio 20–50: Standard heavy process and agitator drives — 28–70 rpm, 250–420 Nm.
- Ratio 60–100: Slow gate actuator and positioning drives — 14–23 rpm, self-locking, up to 500 Nm.
Shaft & Torque Arm Configuration
Output: 35 mm H8 solid shaft with 10×38.3 mm keyway and M12 threaded end. Inch: 1.375 in. Hollow bore mounts directly onto driven shaft — specify driven shaft diameter at order. Torque arm K1=170 mm, 18 mm pin. Input: IEC 100B, 112B, NEMA 140TC, or 180TC — specify at order.
Frequently Asked Questions
❓ What output torque does the NRV075 deliver?
Up to 500 Nm at 100:1 ratio — covers large belt conveyor head drives, heavy agitator vessel drives, and pump station actuators exceeding the NRV063’s 300 Nm capacity.
❓ What is the output shaft diameter of the NRV075?
35 mm H8 standard, 1.375 in inch option. Matches heavy-duty industrial chain sprockets, large conveyor belt drum shafts, and centrifugal pump impellers in the 1.5–3.0 kW class.
❓ Does the NRV075 accept NEMA 180TC input?
Yes — accepts IEC 100B/112B and NEMA 140TC/180TC. Covers 0.75–3.0 kW motors including larger integral-horsepower motors in the 180TC frame common in Australian mining support and heavy agricultural drives.
❓ What is the radial load capacity of the NRV075 output shaft?
Up to 5,500 N at 100:1 — one of the highest in the compact NRV series. Supports direct mounting of ANSI No. 100/120 chain sprockets and C-section V-belt sheaves without an outboard bearing pedestal.
❓ What is the difference between NRV075 and NRV090?
NRV075: 500 Nm, 9.5 kg, 35 mm shaft, 5,500 N radial load. NRV090: ~750 Nm, 13 kg, 35 mm shaft with higher radial load. Select NRV090 for over 500 Nm sustained output.
Customer Reviews
★★★★★
“Using NRV075 reducers on large belt conveyor head drives at our grain terminal in Geelong. 500 Nm is more than adequate for our loaded grain belt and the 35 mm shaft fitted our existing drive drum directly. Fourteen months continuous seasonal operation without any issue.”
Mike Gallagher 🇦🇺 — Terminal Manager, Grain Terminal, Australia
★★★★★
“Installed NRV075 on pump station actuator drives in our water treatment facility in Abu Dhabi. Self-locking at 80:1 holds our valve position on power loss. The NEMA 180TC input let us use our existing motor without any adaptor.”
Fatima Al-Rashid 🇦🇪 — Instrumentation Engineer, Water Treatment, UAE
★★★★½
“Used NRV075 on large agitator vessel drives in our chemical plant in Tianjin. 500 Nm handles our medium-to-high viscosity product blending in continuous duty. Shaft-mount saved significant installation time on our elevated vessel platform.”
Li Hao 🇨🇳 — Process Engineer, Chemical Plant, China
Compatible Accessories & Related Products
🔌
IEC 100B/112B Motor Adaptors
Direct motor mounting for 0.75–3.0 kW motors in 100 and 112 frame — standard motor sizes for Australian heavy agricultural and mining ancillary conveyor drives.
🔨
Torque Arm (K1=170 mm)
18 mm pin dia., M18 weld-on pin brackets. 170 mm arm length minimises bracket weld stress while providing secure anti-rotation for 500 Nm output torque in heavy industrial installations.
🔃
NRV090 Upgrade
For applications requiring over 500 Nm, the NRV090 provides up to ~750 Nm with a 35 mm shaft and higher radial load capacity in the same shaft-mount configuration.
⚙
NMRV075 Foot-Mount Variant
Three NEMA input flanges (56C, 140TC, 180TC — unique in NMRV series) and foot-mount base for applications where shaft-mount configuration is not suitable.
Specify the EP-NRV075 for Your Large Industrial Drive
Application support for ratio selection, driven shaft sizing, and torque arm configuration for Australian grain terminal, mining ancillary, water infrastructure, and heavy agricultural OEM customers.
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