Description
EP-NRV110 — Shaft-Input Large-Frame Aluminium Worm Gear Reducer
The EP-NRV110 is the shaft-input version of the NMRV110, sharing the same 110 mm centre distance, 9,232 N·m maximum output torque, and 7.5 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 NRV110 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 NRV090 at 90 mm centre distance, the NRV110 delivers 26% 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 NRV110 is particularly valued for large crane and hoist chain-driven travel mechanisms and high-power hydraulic-motor-driven industrial mixing and material handling 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-NRV110
| Parameter | Value |
|---|---|
| Series | NRV (Solid Shaft Input, No Input Flange) |
| Centre Distance | 110 mm |
| Reduction Ratios | 5, 7.5, 10, 15, 20, 25, 30, 40, 50, 60, 80, 100 |
| Rated Input Power | Up to 7.5 kW |
| Output Speed Range | 14 to 280 r/min (at 1400 r/min input) |
| Max Output Torque | 9,232 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 | NMRV110 (same internal assembly) |
| Output Bore Diameter | 42 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 |
NRV110 Performance Table (7.5 kW / 1400 r/min)
| Ratio (i) | Output Speed (r/min) | Output Torque (N·m) | Fr max Input (N) | Service Factor (fs) |
|---|---|---|---|---|
| 7.5 | 187 | 2,359 | — | 2.6 |
| 10 | 140 | 2,597 | — | 2.0 |
| 15 | 93 | 2,973 | — | 1.5 |
| 20 | 70 | 3,272 | — | 1.1 |
| 25 | 56 | 3,509 | — | 1.1 |
| 30 | 47 | 3,745 | 12,000 | 1.1 |
| 40 | 35 | 4,285 | — | 1.9 |
| 50 | 28 | 4,905 | — | 1.4 |
| 60 | 23 | 5,399 | — | 1.4 |
| 80 | 18 | 5,816 | — | 1.2 |
| 100 | 14 | 9,232 | — | 1.5 |
✅ NRV110 Defining Features
🔗 7.5 kW Shaft Input — Maximum NRV Non-Flange Power
The NRV110 is the highest-power standard NRV shaft-input worm gearbox before the NRV130, accepting 7.5 kW from any chain, belt, hydraulic motor, or engine countershaft drive arrangement without requiring an IEC flange interface.
📈 9,232 N·m — Class-Leading Shaft-Input Torque
At 9,232 N·m, the NRV110 enables single-stage worm reduction on heavy drives that previously required a two-stage or parallel-shaft arrangement, simplifying chain-driven machine design significantly.
◯ 42 mm Output Bore — Heavy Shaft Interface
The 42 mm H7 output bore and DZ solid shaft accommodate the largest chain sprocket hubs and agitator shaft diameters in the 7.5 kW shaft-input power class.
⛁ 12,000 N Input Radial Load Capacity
The NRV110’s input shaft bearing assembly handles up to 12,000 N of radial load at ratio 30 — the highest in the NRV030–NRV110 series — enabling use with large-pitch heavy chain drives without exceeding bearing capacity.
🅆 IP54 Sustained at 7.5 kW Shaft Input
The NRV110’s reinforced lip seals and ribbed aluminium casting maintain IP54 protection at the maximum 7.5 kW input power level, even in the aggressive chain-oil splash environments typical of heavy industrial chain-drive systems.
🏭 Application Sectors
🚢 Crane & Hoist Chain Drives
Large-frame shaft-input worm gear reducer for overhead crane long-travel chain drives, hoist drum chain drives, and stacker-reclaimer slewing chain drives where hydraulic or engine power is delivered via roller chain.
📥 Port & Bulk Material Handling
High-torque NRV worm gearbox for port grain unloader conveyor chain drives, ship-loader boom conveyor chain drives, and dry-bulk terminal conveyor tail-end chain drives.
🍲 Mining Machinery Chain Drives
Heavy shaft-input worm gear reduction gearbox for surface mine face-conveyor chain drives, ore-crusher feeder conveyor chain drives, and underground mine coal-cutter chain drives in the 5.5–7.5 kW range.
⚙ Large Chemical & Industrial Reactors
Corrosion-resistant aluminium worm gearmotor alternative for large chemical reactor chain-driven agitator drives, polymer processing machine chain drives, and heavy industrial mixer chain-drive arrangements.
🔎 NRV110 Selection & Comparison
Design Example — Port Conveyor Chain Drive
Required: 7.5 kW engine at 1400 r/min (via roller chain) driving port conveyor at 18 r/min (i=80). Output torque from table = 5,816 N·m. For medium-shock port conveyor fs=1.5: demand = 5,816/1.5 = 3,877 N·m — well within rating. ✅ NRV110-80 selected.
NRV110 vs NMRV110 — Which Series to Choose
| Feature | EP-NRV110 (Shaft Input) | EP-NMRV110 (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 |
NRV110 DZ/SZ Output Shaft Dimensions
| G1 (mm) | K1 (mm) | L/DZ (mm) | L1/SZ (mm) | b2 (mm) | d h6 (mm) | Keyway |
|---|---|---|---|---|---|---|
| 155 | 162 | 249 | 324 | 12 | 42 | M16 |
❓ FAQs — EP-NRV110
What is the maximum input shaft radial load for the NRV110?
The Fr max for the NRV110 input shaft is 12,000 N at mid-shaft for ratio 30 — the highest in the NRV030–NRV110 range. This allows use with large-pitch heavy roller chains and V-belt drives up to the 7.5 kW power level.
How does the NRV110 differ from the NRV090?
The NRV110 increases centre distance from 90 to 110 mm, raising max torque from 7,306 to 9,232 N·m (26% increase) and max input power from 5.5 to 7.5 kW. Input shaft radial load capacity rises from 8,180 to 12,000 N, and the output bore increases from 35 to 42 mm.
Can the NRV110 input shaft be driven at speeds above 1400 r/min?
The NRV110 is rated for input speeds up to 1,800 r/min maximum (using 1,400 r/min as the standard reference speed). Above 1,400 r/min, derate the input power proportionally and confirm bearing L10 life is acceptable for the increased speed. Above 1,800 r/min, consult our engineering team.
Is the NRV110 suitable for crane hoist chain drive applications?
Yes. At ratios 30:1 and above, the NRV110 provides static self-locking, making it usable as the speed-reduction element in crane hoist chain drives where load-holding on power removal is required. For safety-critical crane applications, always supplement with a certified mechanical brake as required by crane design standards.
What is the output shaft keyway specification for the NRV110?
The DZ solid output shaft is 42 mm h6 with a 12×8 mm keyway (ISO 773 standard). The hollow output bore is 42 mm H7 with the same 12×8 mm keyway. Alternative keyway sizes (14×9 mm) available for non-standard sprocket hubs.
⭐ Customer Reviews
★★★★★
“We chain-drive four NRV110 units from a central hydraulic motor station to our warehouse overhead crane long-travel mechanisms. The 9,232 N·m output torque at ratio 60 gives smooth, powerful crane movement. Eighteen months in — zero unplanned downtime.”
Richard H. — Facilities Engineer, Manufacturing Warehouse 🇦🇺 Australia (Victoria)
★★★★★
“Our port grain unloader conveyor uses NRV110 units at ratio 80, chain-driven from diesel engines. The aluminium housings handle the coastal salt-spray environment at the port without any corrosion issues after two years of operation.”
James N. — Port Operations Engineer, Grain Export Terminal 🇦🇺 Australia (SA)
★★★★☆
“We installed eight NRV110 units on our underground mine face-conveyor chain drives. The weight saving over cast-iron units reduced the underground transport cost per unit and the self-locking at ratio 40 eliminated the need for separate backstop devices.”
Liam O. — Mining Maintenance Manager, Coal Mine 🇮🇿 New Zealand
⚙ 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.
Specify the EP-NRV110 for Your Chain Drive Project
Our engineers will confirm the input shaft key dimensions, allowable radial load, and output configuration for your heavy chain or belt drive application.
The EP-NRV110 aluminium worm gear reducer features a 110 mm centre distance, ratios from 5 to 100, rated input power up to 7.5 kW, and maximum output torque of 9,232 N·m. With a solid shaft input, this large-frame shaft-input worm gearbox is the choice for high-power chain-driven crane drives, heavy mixing equipment, port conveyors, and large mining machinery where engine, hydraulic, or line-shaft power is delivered via shaft rather than an IEC motor flange.
