Description
EP-NRV150 — Flagship Shaft-Input Maximum-Torque Aluminium Worm Gear Reducer
The EP-NRV150 is the shaft-input version of the NMRV150, sharing the same 150 mm centre distance, 16,508 N·m maximum output torque, and 15 kW input power rating in an identical die-cast aluminium housing, but configured with a solid keyed input shaft in place of the bore-input IEC flange. This configuration makes the NRV150 the natural choice when power arrives via chain sprocket, belt pulley, hydraulic motor output, or PTO-driven countershaft — driving arrangements that cannot present an IEC flange face to the gearbox. Compared with the NRV130 at 130 mm centre distance, the NRV150 delivers 37% more output torque, enabling it to handle heavier chain-driven loads while maintaining the NRV series’s lightweight aluminium housing and corrosion-resistant finish. In Australian industry, the NRV150 is particularly valued for port bulk material conveyor chain drives and large crane hoist chain systems and primary sludge treatment and high-power industrial reactor chain-driven mixing equipment, where the solid shaft input integrates naturally into existing chain or belt drive train layouts without requiring an IEC motor adaptor or modifying the drive geometry.
Technical Specifications — EP-NRV150
| Parameter | Value |
|---|---|
| Series | NRV (Solid Shaft Input, No Input Flange) |
| Centre Distance | 150 mm |
| Reduction Ratios | 5, 7.5, 10, 15, 20, 25, 30, 40, 50, 60, 80, 100 |
| Rated Input Power | Up to 15 kW |
| Output Speed Range | 14 to 280 r/min (at 1400 r/min input) |
| Max Output Torque | 16,508 N·m |
| Input Type | Solid shaft input, no IEC flange |
| Housing Material | Die-cast aluminium alloy |
| Worm Wheel Material | Phosphor bronze |
| Worm Shaft Material | 20CrMnTi alloy steel, case hardened, precision ground |
| Equivalent NMRV | NMRV150 (same internal assembly) |
| Output Bore Diameter | 50 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 |
NRV150 Performance Table (15 kW / 1400 r/min)
| Ratio (i) | Output Speed (r/min) | Output Torque (N·m) | Fr max Input (N) | Service Factor (fs) |
|---|---|---|---|---|
| 7.5 | 187 | 6,962 | — | 1.7 |
| 10 | 140 | 7,663 | — | 1.3 |
| 15 | 93 | 8,771 | — | 0.9 |
| 20 | 70 | 9,654 | — | 1.0 |
| 25 | 56 | 10,400 | — | 0.8 |
| 30 | 47 | 11,051 | 18,000 | 1.3 |
| 40 | 35 | 12,163 | — | 1.3 |
| 50 | 28 | 13,103 | — | 1.0 |
| 60 | 23 | 13,924 | — | 0.8 |
| 80 | 18 | 15,325 | — | 1.0 |
| 100 | 14 | 16,508 | — | 0.8 |
✅ NRV150 Flagship Features
🔗 15 kW Shaft Input — Maximum NRV Power
The NRV150 is the most powerful standard NRV shaft-input worm gearbox, accepting 15 kW from any chain, belt, hydraulic motor, or engine countershaft. No other standard aluminium worm gearbox in the NRV range exceeds this power level.
📈 16,508 N·m — NRV Series Maximum
The flagship output torque for the NRV shaft-input series, enabling single-stage worm reduction on port conveyor head-end drives, crane hoist drums, and heavy reactor agitators that previously required multi-stage gearbox arrangements.
◯ 50 mm Output Bore — Maximum Interface
The 50 mm H7 hollow output bore and DZ solid shaft provide the largest output interface in the NRV series, matching heavy-duty chain sprocket hubs and agitator shaft diameters in the 15 kW power class.
⛁ 18,000 N Input Radial Load Rating
The NRV150’s input bearing assembly handles up to 18,000 N of radial load at ratio 30 — the highest in the entire NRV series — enabling use with triple-strand or large-pitch double-strand roller chain drives at 15 kW.
🅆 ~40 kg at 16,508 N·m
The NRV150 achieves 16,508 N·m in approximately 40 kg, delivering the best torque-to-weight ratio of any standard shaft-input worm gearbox at this power level and simplifying installation logistics on elevated platforms and offshore equipment.
🏭 Where the NRV150 Performs Best
🚢 Port & Bulk Material Chain Drives
Maximum-torque shaft-input worm gear reducer for port grain unloader chain drives, ship-loader boom conveyor chain drives, and dry-bulk terminal stacker-reclaimer chain slewing drives in the 11–15 kW range.
🏹 Heavy Crane Hoist Chain Drives
Flagship NRV aluminium worm gearbox for gantry crane hoist drum chain drives, offshore crane luffing chain mechanisms, and heavy industrial hoist winch chain drives at 14–25 r/min output speed.
📥 Large Reactor & Mixer Chain Drives
High-torque shaft-input worm gear reduction gearbox for large polymer reactor agitator chain drives, bitumen blending vessel chain drives, and heavy chemical kneader machine chain drives requiring 15 kW input at ratio 80–100.
💧 Primary Sludge Treatment Chain Drives
Corrosion-resistant aluminium worm gearmotor alternative for large primary clarifier rake chain drives, anaerobic digester top-entry mixer chain drives, and primary sludge pump chain drives in major metropolitan water treatment plants.
🔎 NRV150 Selection & Comparison
Design Example — Port Bulk Conveyor Chain Drive
Required: 15 kW diesel engine at 1400 r/min (via chain) driving port conveyor at 14 r/min (i=100). Output torque from table = 16,508 N·m. For Class B medium-shock conveyor load, fs=1.3: demand = 16,508/1.3 = 12,699 N·m — within rating. ✅ NRV150-100 selected.
NRV150 vs NMRV150 — Which Series to Choose
| Feature | EP-NRV150 (Shaft Input) | EP-NMRV150 (Flange Input) |
|---|---|---|
| Input Configuration | Solid keyed shaft | Bore input with IEC flange |
| Best Drive Source | Chain, belt, coupling, hydraulic motor, PTO | Direct IEC face-mount motor |
| IEC Flange | Not applicable | Multiple B5/B14 sizes |
| Output Torque | Identical | Identical |
| Housing Dimensions | Identical | Identical |
| Self-Lock at i≥30 | Yes | Yes |
| Best For | Remote or non-standard drive sources | Standard motor-integrated assemblies |
NRV150 DZ/SZ Output Shaft Dimensions
| G1 (mm) | K1 (mm) | L/DZ (mm) | L1/SZ (mm) | b2 (mm) | d h6 (mm) | Keyway |
|---|---|---|---|---|---|---|
| 200 | 187 | 297 | 374 | 14 | 50 | M16 |
❓ FAQs — EP-NRV150
What is the maximum input shaft radial load for the NRV150?
The Fr max for the NRV150 input shaft is 18,000 N at mid-shaft for ratio 30 — the highest in the entire NRV series. This supports triple-strand roller chain drives and large V-belt multi-groove drives up to the full 15 kW input level.
How does the NRV150 compare to the NRV130?
The NRV150 raises centre distance from 130 to 150 mm, increasing max torque by 37% (16,508 vs 12,076 N·m) and input power from 11 to 15 kW. Input radial load capacity rises from 13,500 to 18,000 N and the output bore increases from 45 to 50 mm.
Can the NRV150 be used for offshore port crane chain drives?
Yes. For offshore and marine applications, specify the stainless steel input and output shafts (316L), marine-grade topcoat, and synthetic ISO VG 220 lubricant. The aluminium housing provides inherent corrosion resistance against salt-spray, and the stainless shaft option prevents galvanic corrosion at the shaft-bore interface.
Is the NRV150 self-locking at high reduction ratios?
At ratios 30:1 and above, the NRV150 provides static self-locking (static efficiency below 0.5). For crane hoist applications, this provides an additional safety benefit when the drive chain stops. Always supplement with a certified mechanical brake for safety-critical hoist applications as required by relevant crane standards.
What is the recommended lubrication for the NRV150 at 15 kW continuous duty?
At 15 kW continuous input, we recommend synthetic ISO VG 220 gear oil as standard to provide adequate film strength at elevated operating temperatures. Initial change at 500–1,000 hours; subsequent changes every 8,000–10,000 hours with synthetic lubricant, or every 5,000 hours with mineral ISO VG 220.
⭐ Customer Reviews
★★★★★
“The NRV150 drives our port grain unloader conveyor at ratio 100 via a triple-strand chain from our central diesel engine. At 15 kW chain input, the gearbox handles our 1,500 t/hr throughput without complaint. The 18,000 N radial load rating gave us confidence to use our existing large-pitch chain without modification.”
Tony V. — Terminal Engineer, Grain Export Port 🇦🇺 Australia (WA)
★★★★★
“We use four NRV150 units on our offshore crane hoist chain drives. The stainless shaft option eliminated galvanic corrosion that affected our previous cast-iron units within 12 months. Two years offshore with zero corrosion issues on any of the four units.”
Anders L. — Mechanical Engineer, Offshore Platform Contractor 🇳🇴 Norway
★★★★☆
“Our large primary clarifier uses an NRV150 at ratio 80, chain-driven from a diesel engine. The self-locking at power-off prevents the rake from backdriving, which is critical during maintenance access in the clarifier. Excellent unit for a demanding application.”
Sarah M. — Water Infrastructure Engineer, City Water Authority 🇦🇺 Australia (QLD)
⚙ Accessories & Compatible Products
⚡ IEC Motors (B5/B14)
Standard single-phase and three-phase AC motors with matching IEC flange. VFD inverter-duty versions available.
🔗 Output Shaft Kits
Single solid (DZ), double-ended (SZ), output flange (F), hollow flange (FL) — all H7/h6 tolerance with standard keyways.
🔨 Torque Arms
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.
Enquire About EP-NRV150 — Maximum-Torque Shaft-Input Worm Gearbox
The NRV150 is our highest-torque standard shaft-input aluminium worm gearbox. Our engineering team is ready to confirm the shaft key dimensions, radial load analysis, and lubricant specification for your chain or engine-driven application.
The EP-NRV150 is the flagship shaft-input aluminium worm gear reducer, featuring a 150 mm centre distance, ratios from 5 to 100, rated input power up to 15 kW, and maximum output torque of 16,508 N·m. With a solid shaft input and 50 mm output bore, this maximum-torque shaft-input worm gearbox is purpose-built for port bulk material handling, large crane hoist chain drives, high-power industrial mixing, and primary sludge treatment equipment driven by engines, hydraulic motors, or central drive shafts.
