Description
EP-NRV-E130 — Shaft-Input Aluminium Worm Gearbox with Tail Output Shaft
Technical Specifications — EP-NRV-E130
| Parameter | Value |
|---|---|
| Series | NRV-E (Solid Shaft Input, No Flange, Worm-Direction Tail Output Shaft) |
| 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 Configuration | Solid shaft input (no IEC flange) + worm-direction tail output shaft |
| Input Shaft | Solid keyed shaft input |
| Tail Output Shaft | Worm-direction (co-axial with worm shaft, opposite end) |
| Housing Material | Die-cast aluminium alloy |
| Worm Wheel Material | Phosphor bronze |
| Worm Shaft Material | 20CrMnTi alloy steel, case hardened, precision ground |
| Output Bore Diameter | 45 mm 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 |
NRV-E130 Performance Table (11 kW / 1400 r/min)
| Ratio (i) | Output Speed (r/min) | Output Torque (N·m) | 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 | 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 |
✅ Core Features & Unique Benefits
🔗 Worm-Direction Tail Output Shaft — The Key Differentiator
The defining feature of the NRV-E130 is its additional tail output shaft that extends in the same direction as the worm shaft axis. This second output enables simultaneous drive of two independent loads from a single gearbox — a primary application drive via the main output bore and a secondary auxiliary drive (encoder, tachometer, small pump, or fan) via the tail shaft.
📥 11 kW Chain + Port Throughput Monitoring
The NRV-E130 handles 11 kW chain input from diesel engines or hydraulic motor stations while the tail shaft provides the speed signal for port terminal management throughput monitoring systems.
◯ Same Torque as Standard NRV130
The NRV-E130 delivers identical maximum output torque (12,076 N·m) to the standard NRV130, confirming that the tail shaft adds zero performance penalty on the main output. The tail shaft is driven directly off the worm shaft end, not the output stage.
🅆 Encoder & Feedback Ready
The tail output shaft provides a direct connection point for rotary encoders, tachogenerators, and pulse generators that monitor worm shaft speed in closed-loop motion control systems, eliminating external encoder brackets and coupling hardware.
🚫 IP54 — Dual-Seal Integrity
Both the main output bore and the tail shaft exit are sealed with dual-contact lip seals, maintaining IP54 protection across all mounting orientations without oil weeping at either shaft interface.
🏭 Application Scenarios
🚢 Heavy Crane Hoist Monitoring
Extra-large NMRV-E130 worm gearbox for gantry crane hoist drum drives where the tail shaft provides real-time hoist speed feedback to the crane overload protection system.
📥 Port Bulk Handling SCADA
High-power worm gear reducer with tail output shaft for port grain conveyor drives where the tail shaft speed signal confirms throughput rate to the terminal management system.
🍲 Large Mining Instrumented Drive
Aluminium worm gearbox with tail shaft for large surface mining conveyor drives where the tail-mounted encoder feeds belt speed data to the mine belt management and splice monitoring system.
⚙ Large Reactor Process Control
NMRV-E130 worm gearbox for large chemical reactor agitator drives where the tail shaft encoder provides process speed feedback to the reactor control system for viscosity-controlled mixing.
🔎 Selection Guide
Worked Example — Stacker-Reclaimer Position
Required: NRV-E130 at i=60, chain-driven from 11 kW diesel engine, tail shaft to terminal management encoder. Output speed = 23 r/min, torque = 8,897 N·m. Tail shaft: 500 PPR encoder, 45 mm bore. ✅ NRV-E130-60 selected.
⚖ NRV-E130 vs Standard NRV130
| Feature | EP-NRV-E130 (with Tail Shaft) | EP-NRV130 (Standard) |
|---|---|---|
| Tail Output Shaft | ✅ Yes — worm-direction | No |
| Encoder / Feedback Mounting | Direct on tail shaft | Requires external bracket |
| Dual-Load Drive | Yes — main + tail | No — single output only |
| Main Output Torque | 12,076 N·m | 12,076 N·m |
| Housing Dimensions | Slightly longer (tail shaft protrusion) | Standard length |
| Shaft Input | Yes — solid keyed shaft | Yes — solid keyed shaft |
NRV-E130 Main 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 |
❓ Frequently Asked Questions
What is the tail output shaft on the EP-NRV-E130 and how is it different from the main output?
The tail shaft on the NRV-E130 exits the housing in the worm-direction axis (opposite end of the worm shaft), while the main output bore is perpendicular (90 degrees) to the worm axis. The tail shaft is driven off the worm shaft end and is used for encoder mounting, tachometer connection, or light auxiliary drive, while the main output delivers the full 12,076 N·m load torque.
Does the tail shaft reduce the main output torque of the NRV-E130?
No. The tail shaft draws only the small torque needed for its connected device. The main output retains the full 12,076 N·m rating, identical to the standard NRV130.
What is the input shaft specification for the NRV-E130?
The NRV-E130 has a solid keyed input shaft (no IEC flange). The shaft diameter matches the equivalent NMRV130 bore input diameter. It accepts chain sprockets, belt pulleys, and rigid couplings. A bilateral (double-ended) input shaft is standard; single-end configuration available on request.
What encoder types can be mounted on the NRV-E130 tail shaft?
Any standard keyed rotary encoder with the matching bore diameter can be mounted on the NRV-E130 tail shaft: incremental (5V–24V, 100–10,000 PPR), SSI absolute, or resolver-type. Confirm the encoder bore size and keyway before ordering. The tail shaft key dimensions match the catalogue DZ shaft specification for NMRV-E130.
Can the NRV-E130 be used for closed-loop speed control in a chain-driven system?
Yes. The NRV-E130 is the ideal solution for chain-driven systems requiring closed-loop speed feedback. The chain drives the solid input shaft; the main output drives the load; and the tail shaft mounts an encoder that feeds speed/position data back to the controller. This eliminates the need for a separate encoder mounting bracket or a second independent encoder drive arrangement.
⭐ Customer Reviews
★★★★★
“Our heavy gantry crane long-travel chain drives use NRV-E130 units with tail-shaft encoders. Load positioning resolution improved to plus/minus 5 mm and our crane operators report significantly greater confidence in precision load placement.”
Craig S. — Crane Engineer, Heavy Industry 🇦🇺 Australia (SA)
★★★★★
“The NRV-E130 chain-drives our port stacker-reclaimer slewing mechanism and the tail-shaft encoder provides position data to our terminal management system. Installation was straightforward and the encoder interface was plug-and-play with our existing control hardware.”
Marco P. — Terminal Engineer, Bulk Port 🇳🇿 New Zealand
★★★★☆
“We use NRV-E130 on our large mining conveyor chain drive. The tail-shaft rotation sensor provides belt-speed data to our conveyor belt management system. Single-stage worm reduction replaced a two-stage arrangement and simplified maintenance significantly.”
Chris A. — Maintenance Superintendent, Gold Mine 🇦🇺 Australia (WA)
⚙ Accessories & Compatible Products
⚡ IEC Motors (B5/B14)
Standard AC motors with matching IEC flange. VFD inverter-duty versions available for variable-speed control.
🔗 Output Shaft Kits
Single solid (DZ), double-ended (SZ), output flange (F), hollow flange (FL) — all H7/h6 tolerance with standard keyways.
🔨 Torque Arms & Brackets
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-NRV-E130
Our team will confirm the input shaft, ratio, and encoder bore for your extra-large chain-driven instrumented industrial application.
The EP-NRV-E130 aluminium worm gearbox combines a solid shaft input (no IEC flange) with an additional worm-direction tail output shaft. Centre distance 130 mm, ratios 5 to 100, input power up to 11 kW, max output torque 12,076 N·m. The tail shaft enables simultaneous encoder feedback, safety interlock monitoring, or auxiliary drive — the ideal instrumented shaft-input worm gearbox for chain-driven closed-loop agricultural, industrial, and mining drive systems.
