Descripción
EP-NRV-E050 Aluminium Coaxial Worm Gearbox — Solid Shaft Input, Inline Output
The EP-NRV-E050 is a precision inline shaft-coupled aluminium worm gearbox and a precise inline shaft-coupled unit in the NRV-E series, built around a 050 mm worm gear centre distance. It represents the most specialised configuration in the four-variant series: combining the solid 14 mm solid input shaft of the NRV series with the coaxial inline output of the NMRV-E series. The result is a worm gearbox that operates as a pure inline shaft-coupled reduction stage — accepting a shaft coupling, chain sprocket, or belt pulley on the input and delivering reduced speed on the same axis at the output, with no motor flange projection at either end and no 90-degree shaft offset. This configuration is engineered for printing press inline gear trains, bottling line shaft drives, packaging inline shaft systems, and servo gear trains where the complete drive train must maintain a single shaft axis from source to load. With output torques up to 800 Nm, ratios from 5–100:1, die-cast aluminium A360 housing, and IP65 shaft sealing, the EP-NRV-E050 serves inline shaft-coupled drives in printing, bottling, and packaging machinery across Australia and international markets. All six mounting positions are supported for maximum installation flexibility.
Technical Specifications — EP-NRV-E050
General Specifications
| Parameter | Specification |
|---|---|
| Model Number | EP-NRV-E050 |
| Series | NRV-E — Solid input shaft, coaxial inline output |
| Centre Distance | 050 mm |
| Output Configuration | Coaxial / Inline — same axis as input shaft |
| Max Output Torque | 800 Nm |
| Reduction Ratios | 5–100:1 |
| Input Shaft Diameter | 14 mm solid |
| Input Shaft Keyway | 5×3.0 mm |
| Input Shaft Tolerance | h6 (precision ground) |
| Max Input Shaft Radial Load (Fri max) | 490 N |
| Output Shaft Diameter | 25 mm (coaxial) |
| Max Recommended Input Power | 0.18 kW |
| Housing Material | Die-cast aluminium alloy A360 |
| Worm Wheel Material | Phosphor bronze |
| Worm Shaft Material | 20CrMnTi case-hardened steel, ground |
| Surface Treatment | Baked enamel paint (RAL 5010 blue) |
| Lubricant | ISO VG 220 worm gear oil, ~0.35 L |
| IP Rating | IP65 (shaft seals standard) |
| Ambient Temperature | -10°C to +40°C standard; up to +60°C with synthetic oil |
| Max Input Speed | 1,400 rpm (recommended); 1,800 rpm (max) |
| Approx. Weight | ~4.5 kg |
| Mounting Positions | B3, B6, B7, B8, V5, V6 |
| Output Configurations | Coaxial solid shaft (standard) / Coaxial output flange (FL) |
| Note | Double output shaft (DZ) not available — coaxial geometry |
| Standards | ISO 9001, CE marking |
Performance Selection Data (1,400 rpm Input)
| Ratio (i) | Output Speed (r/min) | Output Torque (Nm) | Input Power (kW) |
|---|---|---|---|
| 7.5:1 | 187 | 650 | 0.18 |
| 10:1 | 140 | 750 | 0.18 |
| 15:1 | 93 | 860 | 0.18 |
| 20:1 | 70 | 950 | 0.18 |
| 30:1 | 47 | 1020 | 0.18 |
| 50:1 | 28 | 1080 | 0.18 |
Core Features & Benefits
◯Solid Shaft Input + Coaxial Output — The Ultimate Inline Shaft Drive
The EP-NRV-E050 combines both specialised features: a solid 14 mm solid input shaft (no motor flange) and a coaxial inline output shaft. This dual configuration produces the most compact possible inline shaft-coupled worm gearbox — ideal for multi-stage gear trains and inline shaft drives where both ends must be on the same axis with no flange projection.
△Shaft-to-Shaft Inline Reduction — No Axis Deviation
Unlike right-angle units, the NRV-E050 receives and delivers power along a single axis. Solid input shaft accepts couplings, sprockets, and pulleys; coaxial output connects to the driven load shaft. The result is a reduction stage that slots into any inline shaft train without introducing a 90-degree offset or motor flange bracket at either end.
◆Corrosion-Resistant Die-Cast Aluminium Housing
A360 die-cast aluminium provides inherent corrosion resistance for food processing, coastal, chemical, and humid environments. Baked enamel surface finish adds UV protection. 30–40% lighter than cast iron equivalents — critical for weight-sensitive elevated or moving structures.
■Identical Torque to All NRV{size} Variants
The NRV-E050 delivers the same 800 Nm maximum output torque as the standard NRV050, NMRV050, and NMRV-E050 — all four variants share the same precision-ground worm set and phosphor bronze wheel. Only input/output configuration differs.
▶Static Self-Locking at Ratios ≥ 40:1
At 40:1 and above, worm geometry prevents back-drive under static load — useful in positioning, conveyor braking, and crane holding applications within inline shaft drive trains. Identical self-locking behaviour to all other NRV/NMRV variants using the same worm set.
●Full Mounting Position Flexibility — Six Orientations
B3, B6, B7, B8, V5, V6 mounting positions available. For V5/V6 vertical orientations, use the NRV-E lubrication guide (not standard NRV) to set the correct fill level for the coaxial internal geometry. Coaxial layout is particularly effective in vertical inline drive train columns.
All Four 050-Frame Variants — Which One Is Right for You?
All four variants in the 050-frame series share the same worm set, output torque ratings, and housing. Select based solely on input type (solid shaft vs IEC flange) and output direction (coaxial vs right-angle).
| Feature | EP-NRV-E050 ▶ | EP-NMRV-E050 | EP-NRV050 | EP-NMRV050 |
|---|---|---|---|---|
| Input Type | Solid shaft (no flange) | Hollow bore IEC flange | Solid shaft (no flange) | Hollow bore IEC flange |
| Output Direction | Coaxial / Inline | Coaxial / Inline | 90° Right-angle | 90° Right-angle |
| Max Output Torque | 800 Nm | 800 Nm | 800 Nm | 800 Nm |
| Best Use Case | Inline shaft-coupled gear trains | Inline motor-driven drives | Shaft-coupled right-angle drives | Direct motor right-angle drives |
| Motor Flange | No | Yes (IEC) | No | Yes (IEC) |
| Lateral Width | Narrowest inline | Narrow inline | Wider (90° shaft offset) | Wider (90° shaft offset) |
| Double Shaft DZ | Not available | Not available | Available | Available |
| Housing | Aluminium A360 (same) | Aluminium A360 (same) | Aluminium A360 (same) | Aluminium A360 (same) |
Application Sectors — EP-NRV-E050
The EP-NRV-E050 is the preferred choice for the following inline shaft-coupled drive system types where the solid input shaft and coaxial output together eliminate both motor flange projection and 90-degree shaft offset.
⚘ Printing Press Inline Trains
Suitable NRV-E solid shaft worm gearbox printing press.
⚙ Bottling Line Shaft Drives
Suitable coaxial shaft worm reducer bottling line.
⚚ Packaging Inline Shaft
Suitable inline shaft worm gearbox packaging automation.
⚒ Servo Gear Trains
Suitable NRV-E worm reducer servo gear train.
⚛ Conveyor Inline Shaft
Suitable solid shaft inline worm gearbox conveyor shaft.
Selection Guide, Mounting Positions & Shaft Details
How to Select the Correct Ratio
- Calculate required output torque: M₂ = 9,550 × P (kW) / n₂ (rpm), multiplied by service factor (fs = 1.0–2.5 per duty class).
- Determine actual input shaft speed: For belt/chain-driven inputs, n_input = n_primary × (D_primary / D_NRV-E). Use the actual input speed — not the primary motor rated speed.
- Find your ratio: i = n_input / n_output. Select the closest from 5–100:1.
- Confirm torque capacity and input radial load: Rated torque must exceed M₂ × fs. Calculate input shaft radial load from belt/chain tension and verify against Fri max = 490 N. Step up to EP-NRV-E063 if either limit is exceeded.
Input & Output Shaft Details
Input shaft: 14 mm solid solid | Keyway: 5×3.0 mm | Tolerance: h6 | Max radial load: 490 N
Output shaft: 25 mm solid, coaxial (same axis as input) | With keyway | Standard solid shaft or FL flange option
25 mm with keyway on same axis as input. Default supply.
Direct bolt-on flanged connection coaxial with input axis. Suffix: FL.
Double output shaft (DZ) is NOT available in the NRV-E coaxial series.
Mounting Positions
| Position | Description | Shaft Orientation | Oil Level Note |
|---|---|---|---|
| B3 | Horizontal foot mount | Inline horizontal shaft — input and output facing opposite ends | Standard fill level — default |
| B6 | Foot mount, output shaft down | Inline vertical shaft downward | Reduce oil by ~15% |
| B7 | Foot mount, output shaft up | Inline vertical shaft upward | Increase oil by ~15% |
| B8 | Foot mount, 180° rotated | Inline horizontal reversed | Standard fill level |
| V5 | Flange mount, shaft down | Inline vertical downward | Reduce oil — use NRV-E lube guide |
| V6 | Flange mount, shaft up | Inline vertical upward | Increase oil — use NRV-E lube guide |
Important: For NRV-E V5/V6 vertical orientations, use the NRV-E lubrication diagram to set the correct oil fill level. The coaxial internal geometry requires a different fill level from both the standard NRV and NMRV-E guides.
Frequently Asked Questions — EP-NRV-E050
▶ Why is the EP-NRV-E050 chosen for printing press inline gear trains?
Printing presses use inline gear trains where each drive component must maintain a common shaft axis through the press frame. The NRV-E050’s solid 14 mm input shaft accepts a gear coupling from the previous drive stage, and the coaxial output continues the shaft axis to the next stage — maintaining the compact inline profile throughout the press drive train. Smooth torque delivery and low backlash are critical for print registration accuracy.
▶ What is the input shaft specification of the EP-NRV-E050?
Solid 14 mm input shaft with 5×3.0 mm keyway, h6 tolerance. Maximum input shaft radial load (Fri max) is 490 N. Suitable for gear couplings, chain sprockets (verify chain tension against Fri max), and toothed belt pulleys in inline drive train applications.
▶ What are the output shaft options for the EP-NRV-E050?
Standard: single 25 mm coaxial solid output shaft with keyway. Output flange (FL suffix) available for direct bolt-on coaxial connection. Note: double output shaft (DZ) is not available in the NRV-E series due to the coaxial housing geometry.
▶ How does the EP-NRV-E050 compare to the other three NRV050 variants?
All four NRV050 variants share the same 50 mm centre distance, worm set, and 800 Nm torque rating. They differ in input/output configuration: NMRV050 (flange in, 90° out), NRV050 (shaft in, 90° out), NMRV-E050 (flange in, inline out), NRV-E050 (shaft in, inline out). Select NRV-E050 for inline shaft-coupled drive trains with no motor flange requirement.
▶ What is the maximum recommended input speed for the EP-NRV-E050?
1,400 rpm recommended; 1,800 rpm absolute maximum. For VFD-driven applications, operate between 700–1,400 rpm to maintain adequate lubrication circulation within the coaxial housing.
▶ How is the EP-NRV-E050 lubricated in vertical orientations?
Approximately 0.35 litres of ISO VG 220 oil for B3 horizontal mounting. For V5/V6 vertical orientations, the fill level must be set per the NRV-E lubrication diagram — the internal oil distribution in the coaxial configuration differs from the right-angle NRV and requires a different fill level to maintain adequate worm mesh lubrication in vertical positions.
Customer Reviews
★★★★★
“The EP-NRV-E050 drives an intermediate stage in our web offset printing press inline gear train. Solid shaft input from the upstream roll drive, coaxial output to the downstream feed roll — maintaining the press shaft axis through the entire drive train. Extremely low backlash and smooth torque are critical for our print registration tolerances. Very satisfied.”
Sandra Thompson — Print Machinery Australia
Australia
★★★★★
“Used in the inline bottle conveyor shaft drive train. The NRV-E050 connects our primary gearbox output to the conveyor drive shaft on the same axis — no bracket, no 90-degree deviation. After a year of continuous operation the units run as quietly as on day one.”
Fabio Conti — Bottling Line Solutions
Italy
★★★★☆
“Integrated into the servo-driven inline transfer shaft train of our tray sealing machines. The coaxial layout keeps every stage within the machine frame width. Good ratio accuracy and consistent quality across our production batches.”
Park Ji-hoon — Packaging Drive Systems
South Korea
Related Products & Accessories
⚙ Input Connection Options
Flexible jaw / disc / gear couplings for 14 mm solid shaft.
Chain sprockets (verify tension against Fri max 490 N).
V-belt and toothed belt pulleys.
Bearing support bracket for high-tension chain/belt inputs.
⚒ Output Options
■ Coaxial solid shaft (standard, 25 mm)
■ Coaxial output flange (FL suffix)
◆ DZ double shaft not available in NRV-E series
■ Torque arm for torque reaction mounting
◆ All Four 050-Frame Variants
■ EP-NRV-E050 — this unit (shaft in, coaxial out)
■ EP-NMRV-E050 — flange in, coaxial out
■ EP-NRV050 — shaft in, 90° right-angle out
■ EP-NMRV050 — flange in, 90° right-angle out
■ EP-NRV-E063 — next frame size up
Ready to Order the EP-NRV-E050?
Request a quote, technical selection support, or enquire about OEM and distributor partnership opportunities for Australian and international markets.
▼ Distributor & OEM partnerships welcome — volume pricing available
