Description
EP-NRV130 — Shaft-Input Extra-Large Aluminium Worm Gear Reducer
The EP-NRV130 is the shaft-input version of the NMRV130, sharing the same 130 mm centre distance, 12,076 N·m maximum output torque, and 11 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 NRV130 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 NRV110 at 110 mm centre distance, the NRV130 delivers 31% 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 NRV130 is particularly valued for heavy crane travel and hoist chain drive systems and large port conveyor and mining machinery chain drives in the 7.5–11 kW range, 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-NRV130
| Parameter | Value |
|---|---|
| Series | NRV (Solid Shaft Input, No Input Flange) |
| Centre Distance | 130 mm |
| Reduction Ratios | 5, 7.5, 10, 15, 20, 25, 30, 40, 50, 60, 80, 100 |
| Rated Input Power | Up to 11 kW |
| Output Speed Range | 14 to 280 r/min (at 1400 r/min input) |
| Max Output Torque | 12,076 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 | NMRV130 (same internal assembly) |
| Output Bore Diameter | 45 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 |
NRV130 Performance Table (11 kW / 1400 r/min)
| Ratio (i) | Output Speed (r/min) | Output Torque (N·m) | Fr max Input (N) | Service Factor (fs) |
|---|---|---|---|---|
| 7.5 | 187 | 3,893 | — | 1.9 |
| 10 | 140 | 4,285 | — | 1.8 |
| 15 | 93 | 4,905 | — | 1.4 |
| 20 | 70 | 5,399 | — | 1.1 |
| 25 | 56 | 5,816 | — | 1.1 |
| 30 | 47 | 6,181 | 13,500 | 1.1 |
| 40 | 35 | 7,607 | — | 1.2 |
| 50 | 28 | 8,084 | — | 1.2 |
| 60 | 23 | 8,897 | — | 1.0 |
| 80 | 18 | 10,185 | — | 1.0 |
| 100 | 14 | 12,076 | — | 1.1 |
✅ NRV130 Key Features
🔗 11 kW Shaft Input — Heavy Industrial Power
At 11 kW shaft input, the NRV130 handles the output of large diesel engines, hydraulic motor stations, and high-power electric motor belt drives that cannot be presented as an IEC flange, making it the most powerful standard NRV shaft-input unit before the NRV150.
📈 12,076 N·m — Extra-Large Torque
31% more torque than the NRV110, the NRV130 enables single-stage worm reduction on drives previously requiring a two-stage arrangement, directly reducing cost and complexity in heavy chain-drive machine designs.
◯ 45 mm Output Bore
The 45 mm H7 hollow output bore and DZ solid shaft accept the largest chain sprocket hubs and agitator shaft diameters in the 11 kW shaft-input power class.
⛁ 13,500 N Input Radial Load
The NRV130’s input bearing assembly withstands up to 13,500 N radial load at ratio 30, accommodating large-pitch double-strand roller chain drives and heavy V-belt drives.
🅆 ~30 kg — 55% Lighter Than Cast Iron
The NRV130 weighs approximately 30 kg versus 65–70 kg for a cast-iron equivalent. In crane and elevated conveyor installations, this weight reduction simplifies structural design and reduces crane hire time during installation.
🏭 Application Sectors
🚢 Heavy Crane & Hoist Chain Drives
Extra-large shaft-input worm gear reducer for gantry crane long-travel chain drives, heavy hoist drum chain drives, and offshore crane slewing chain drives in the 7.5–11 kW range.
🍲 Port & Mining Conveyors
High-torque NRV worm gearbox for port bulk conveyor chain drives, mining belt conveyor tail-end chain drives, and ore-crusher chain feeder drives powered by large engines or hydraulic motor stations.
📥 Large Reactor & Mixer Chain Drives
Shaft-input worm gear reduction gearbox for large chemical reactor agitator chain drives, bitumen blending tank chain drives, and heavy industrial mixer chain-driven arrangements in the 7.5–11 kW class.
🌿 Large-Scale Agricultural Machinery
Corrosion-resistant aluminium worm gearmotor alternative for large grain elevator leg chain drives, heavy forage harvester conveyor chain drives, and large-scale agricultural processing facility chain-driven conveyor systems.
🔎 Specification & Comparison
NRV130 vs NMRV130 — Which Series to Choose
| Feature | EP-NRV130 (Shaft Input) | EP-NMRV130 (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 |
NRV130 DZ/SZ Output Shaft Dimensions
| G1 (mm) | K1 (mm) | L/DZ (mm) | L1/SZ (mm) | b2 (mm) | d h6 (mm) | Keyway |
|---|---|---|---|---|---|---|
| 170 | 170 | 265 | 340 | 14 | 45 | M16 |
❓ FAQs — EP-NRV130
What is the maximum input shaft radial load for the NRV130?
The Fr max for the NRV130 input shaft is 13,500 N at mid-shaft for ratio 30 — the highest in the NRV063–NRV130 range. This supports large-pitch double-strand roller chain drives up to the 11 kW power level.
How does the NRV130 differ from the NRV110?
The NRV130 raises centre distance from 110 to 130 mm, increasing max torque from 9,232 to 12,076 N·m (31%) and input power from 7.5 to 11 kW. Input radial load capacity rises from 12,000 to 13,500 N and the output bore increases from 42 to 45 mm.
Is the NRV130 suitable for offshore crane slewing drives?
Yes, with appropriate specification. For offshore marine use, specify the stainless steel input and output shafts (316L grade), marine-grade electrostatic topcoat, and synthetic ISO VG 220 gear oil to resist salt-spray and extend lubricant change intervals at sea.
What lubricant volume does the NRV130 require?
The NRV130 requires approximately 1.2–1.8 litres of ISO VG 220 gear oil depending on mounting position (B3 uses less; V5/V6 use more). Always fill to the level indicator mark for the specific mounting position as shown in the oil-level diagram supplied with the unit.
Can the NRV130 handle shock loads from mining conveyor start-up?
For Class C heavy-shock mining applications (inertia factor Fa ≤ 10), apply service factor fs=2.0–2.5 and verify that the rated output torque at the selected ratio divided by fs exceeds the calculated load torque. Contact our engineering team for a detailed shock-load analysis if the application involves frequent heavy starting.
⭐ Customer Reviews
★★★★★
“Our heavy-duty crane travel chain drives use NRV130 units at ratio 60. The 12,076 N·m torque provides a generous margin for our heaviest lifts and the aluminium housing has shown zero corrosion in our coastal South Australian facility after 20 months.”
Craig S. — Crane Maintenance Engineer 🇦🇺 Australia (South Australia)
★★★★★
“We installed NRV130 units on our port grain conveyor chain drives. The 11 kW shaft input from our central hydraulic motor station gave us exactly the speed and torque we needed at ratio 80. Very impressed with the torque density for an aluminium unit.”
Marco P. — Terminal Engineer, Grain Export Port 🇮🇿 New Zealand
★★★★☆
“The NRV130 replaced two-stage cast-iron reducers on our mining conveyor chain drives. Single-stage reduction simplified maintenance significantly and the weight saving of 35 kg per unit cut our underground transport logistics substantially.”
Chris A. — Maintenance Superintendent, Gold Mine 🇦🇺 Australia (WA)
⚙ 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-NRV130
Our engineering team will confirm the shaft key dimensions, allowable radial load, and output configuration for your heavy chain or engine-driven application.
The EP-NRV130 aluminium worm gear reducer features a 130 mm centre distance, ratios from 5 to 100, rated input power up to 11 kW, and maximum output torque of 12,076 N·m. Its solid shaft input design makes it the go-to extra-large shaft-input worm gearbox for heavy crane systems, large mining conveyors, port bulk material drives, and high-power industrial mixing equipment where chain or engine power is delivered via shaft rather than an IEC motor flange.
