Description
EP-NRV-E050 — Shaft-Input Aluminium Worm Gearbox with Tail Output Shaft
Technical Specifications — EP-NRV-E050
| Parameter | Value |
|---|---|
| Series | NRV-E (Solid Shaft Input, No Flange, Worm-Direction Tail Output Shaft) |
| Centre Distance | 050 mm |
| Reduction Ratios | 5, 7.5, 10, 15, 20, 25, 30, 40, 50, 60, 80, 100 |
| Rated Input Power | Up to 1.1 kW |
| Output Speed Range | 14 to 280 r/min (at 1400 r/min input) |
| Max Output Torque | 4,280 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 | 25 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-E050 Performance Table (1.1 kW / 1400 r/min)
| Ratio (i) | Output Speed (r/min) | Output Torque (N·m) | Service Factor (fs) |
|---|---|---|---|
| 7.5 | 187 | 683 | 2.3 |
| 10 | 140 | 752 | 1.8 |
| 15 | 93 | 861 | 1.3 |
| 20 | 70 | 948 | 1.0 |
| 30 | 47 | 1,085 | 1.0 |
| 40 | 35 | 2,475 | 2.1 |
| 50 | 28 | 2,865 | 2.3 |
| 60 | 23 | 3,153 | 1.7 |
| 80 | 18 | 3,610 | 1.6 |
| 100 | 14 | 4,280 | 1.4 |
✅ Core Features & Unique Benefits
🔗 Worm-Direction Tail Output Shaft — The Key Differentiator
The defining feature of the NRV-E050 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.
🅆 PTO Drive + Safety Monitoring
The NRV-E050 accepts PTO chain or belt input up to 1.1 kW while the tail shaft provides the rotation monitoring output for safety interlock systems — critical for grain dryer conveyor safety in Australian agriculture.
◯ Same Torque as Standard NRV050
The NRV-E050 delivers identical maximum output torque (4,280 N·m) to the standard NRV050, 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
🚮 Closed-Loop Conveyor Control
NMRV-E050 worm gearbox for heavy conveyor drives where the tail shaft mounts a tachogenerator providing speed feedback to a VFD controller, enabling precise belt speed regulation under variable load.
⚙ Industrial Mixer Monitoring
Heavy-duty worm gear reducer with tail output shaft for industrial mixer drives where the tail shaft speed signal monitors worm shaft rotation, detecting stall conditions in high-viscosity batches.
💧 Water Treatment Instrumented Drives
Aluminium worm gearbox with tail shaft for slow-speed filter screen and sludge scraper drives where a tail-mounted pulse counter provides the operations team with real-time rotation confirmation.
📦 Print Line Register Control
Worm gear reduction gearbox with tail output for gravure printing press section drives where the tail shaft encoder provides master-line speed reference for digital register control systems.
🔎 Selection Guide
Worked Example — Grain Dryer Safety Interlock
Required: NRV-E050 at i=30, chain-driven from 1.1 kW engine countershaft, tail shaft to safety PLC rotation sensor. Output speed = 47 r/min, torque = 1,085 N·m. Tail shaft: proximity sensor target disk, 25 mm bore. ✅ NRV-E050-30 selected.
⚖ NRV-E050 vs Standard NRV050
| Feature | EP-NRV-E050 (with Tail Shaft) | EP-NRV050 (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 | 4,280 N·m | 4,280 N·m |
| Housing Dimensions | Slightly longer (tail shaft protrusion) | Standard length |
| Shaft Input | Yes — solid keyed shaft | Yes — solid keyed shaft |
NRV-E050 Main Output Shaft Dimensions
| G1 (mm) | K1 (mm) | L/DZ (mm) | L1/SZ (mm) | b2 (mm) | d h6 (mm) | Keyway |
|---|---|---|---|---|---|---|
| 92 | 99 | 153 | 199 | 8 | 25 | M10 |
❓ Frequently Asked Questions
What is the tail output shaft on the EP-NRV-E050 and how is it different from the main output?
The tail shaft on the NRV-E050 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 4,280 N·m load torque.
Does the tail shaft reduce the main output torque of the NRV-E050?
No. The tail shaft draws only the small torque needed for its connected device. The main output retains the full 4,280 N·m rating, identical to the standard NRV050.
What is the input shaft specification for the NRV-E050?
The NRV-E050 has a solid keyed input shaft (no IEC flange). The shaft diameter matches the equivalent NMRV050 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-E050 tail shaft?
Any standard keyed rotary encoder with the matching bore diameter can be mounted on the NRV-E050 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-E050.
Can the NRV-E050 be used for closed-loop speed control in a chain-driven system?
Yes. The NRV-E050 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 grain-dryer fan conveyor uses NRV-E050 chain-driven from the dryer main shaft. The tail-shaft encoder confirms rotation to our dryer management PLC and automatically shuts down the burner if the conveyor stops. A safety-critical feature that works perfectly.”
Peter N. — Farm Operations Manager 🇦🇺 Australia (QLD)
★★★★★
“We chain-drive NRV-E050 units on our food-plant batch conveyors. The tail-shaft tachometer signal integrates with our HACCP batch tracking system, recording conveyor speed for every production run. Exactly the audit trail we needed.”
Thomas W. — Plant Engineer, Food Manufacturer 🇬🇧 UK
★★★★☆
“The NRV-E050 drives our irrigation pump chain drive and the tail shaft monitors pump rotation for our SCADA. We now get automatic alerts if the pump stops during an irrigation cycle. The combined chain-input encoder-output design simplified our installation considerably.”
Helen M. — Farm Manager, Horticulture 🇦🇺 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.
Enquire About EP-NRV-E050
Our team will confirm the input shaft specification, ratio, and safety encoder arrangement for your chain-driven agricultural or industrial application.
The EP-NRV-E050 aluminium worm gearbox combines a solid shaft input (no IEC flange) with an additional worm-direction tail output shaft. Centre distance 050 mm, ratios 5 to 100, input power up to 1.1 kW, max output torque 4,280 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.
