Description
EP-NRV-E040 Aluminium Coaxial Worm Gearbox — Solid Shaft Input, Inline Output
The EP-NRV-E040 is a versatile inline shaft drive aluminium worm gearbox and a versatile inline shaft-input unit in the NRV-E series, built around a 040 mm worm gear centre distance. It represents the most specialised configuration in the four-variant series: combining the solid 11 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 inline belt-driven pump trains, compact mixer shaft chains, automated machinery inline drives, and multi-stage gear systems where the complete drive train must maintain a single shaft axis from source to load. With output torques up to 400 Nm, ratios from 5–100:1, die-cast aluminium A360 housing, and IP65 shaft sealing, the EP-NRV-E040 serves inline shaft-coupled drives on compact pump and process machinery across Australia and international markets. All six mounting positions are supported for maximum installation flexibility.
Technical Specifications — EP-NRV-E040
General Specifications
| Parameter | Specification |
|---|---|
| Model Number | EP-NRV-E040 |
| Series | NRV-E — Solid input shaft, coaxial inline output |
| Centre Distance | 040 mm |
| Output Configuration | Coaxial / Inline — same axis as input shaft |
| Max Output Torque | 400 Nm |
| Reduction Ratios | 5–100:1 |
| Input Shaft Diameter | 11 mm solid |
| Input Shaft Keyway | 4×2.5 mm |
| Input Shaft Tolerance | h6 (precision ground) |
| Max Input Shaft Radial Load (Fri max) | 350 N |
| Output Shaft Diameter | 18 mm (coaxial) |
| Max Recommended Input Power | 0.12 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, ~0.20 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 | ~2.8 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 | 400 | 0.12 |
| 10:1 | 140 | 430 | 0.12 |
| 15:1 | 93 | 470 | 0.12 |
| 20:1 | 70 | 500 | 0.12 |
| 30:1 | 47 | 540 | 0.12 |
| 50:1 | 28 | 560 | 0.12 |
Core Features & Benefits
◯Solid Shaft Input + Coaxial Output — The Ultimate Inline Shaft Drive
The EP-NRV-E040 combines both specialised features: a solid 11 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-E040 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-E040 delivers the same 400 Nm maximum output torque as the standard NRV040, NMRV040, and NMRV-E040 — 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 040-Frame Variants — Which One Is Right for You?
All four variants in the 040-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-E040 ▶ | EP-NMRV-E040 | EP-NRV040 | EP-NMRV040 |
|---|---|---|---|---|
| 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 | 400 Nm | 400 Nm | 400 Nm | 400 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-E040
The EP-NRV-E040 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.
⚘ Inline Belt-Driven Pumps
Suitable NRV-E solid shaft worm gearbox inline pump train.
⚙ Compact Mixer Shaft Chains
Suitable coaxial solid shaft worm reducer mixer chain.
⚚ Automated Machinery Inline
Suitable inline shaft worm gearbox automated machinery.
⚒ Multi-Stage Gear Systems
Suitable NRV-E worm reducer multi-stage gear system.
⚛ Inline HVAC Shaft Drives
Suitable solid shaft coaxial worm gearbox HVAC inline.
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 = 350 N. Step up to EP-NRV-E050 if either limit is exceeded.
Input & Output Shaft Details
Input shaft: 11 mm solid solid | Keyway: 4×2.5 mm | Tolerance: h6 | Max radial load: 350 N
Output shaft: 18 mm solid, coaxial (same axis as input) | With keyway | Standard solid shaft or FL flange option
18 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-E040
▶ How does the EP-NRV-E040 fit into inline belt-driven pump train systems?
In inline pump trains, the EP-NRV-E040 solid 11 mm input shaft connects via coupling or belt pulley to the primary drive, while the coaxial output shaft connects directly to the pump input shaft — all on the same axis. This eliminates both the IEC motor flange bracket and the 90-degree shaft offset, producing the most compact possible in-line pump drive arrangement.
▶ What is the input shaft specification and maximum radial load for the EP-NRV-E040?
Solid 11 mm input shaft with 4×2.5 mm keyway, h6 tolerance. Maximum input shaft radial load (Fri max) is 350 N. For chain or belt drive inputs, calculate the belt/chain tension radial force and verify it does not exceed this limit. A bearing support bracket near the input sprocket is recommended for drives approaching Fri max.
▶ What output torque does the EP-NRV-E040 deliver?
Up to 400 Nm output torque through the 18 mm coaxial output shaft at 1,400 rpm input — identical to the standard NRV040 and NMRV040. The coaxial output routing does not reduce the worm set torque capacity.
▶ How does the EP-NRV-E040 compare to the EP-NMRV-E040?
The NRV-E040 has a solid input shaft; the NMRV-E040 has a hollow bore IEC motor flange. Both feature the same coaxial output. Choose NRV-E040 when power comes from an existing shaft, belt, or chain drive; choose NMRV-E040 when a motor mounts directly via IEC flange to the gearbox input.
▶ What mounting positions are available for the EP-NRV-E040?
All six standard positions: B3, B6, B7, B8, V5, V6. B3 horizontal is the default factory supply. For V5/V6 vertical orientations, adjust the oil fill level per the NRV-E lubrication guide, which differs from the standard NRV guide due to the coaxial internal arrangement.
▶ Is the EP-NRV-E040 suitable for automated door systems using a belt-driven input?
Yes. The NRV-E040 with belt-pulley input and coaxial output is well suited to automated door drive trains where a belt drive from the motor provides vibration isolation, and the coaxial gearbox output connects inline to the door lead screw or belt sprocket shaft. At 40:1 ratio, static self-locking holds the door position without motor power.
Customer Reviews
★★★★★
“The EP-NRV-E040 is the heart of our compact inline pump drive train — chain from motor, into the solid input shaft, coaxial output to the pump. The entire assembly is 120 mm shorter than the bracket-and-right-angle arrangement it replaced. Running flawlessly in outdoor agricultural pump stations across Queensland.”
Derek Morrison — Pump Engineering Pty Ltd
Australia
★★★★★
“Used in inline multi-stage reduction trains on our automated production equipment. The solid shaft input and coaxial output maintain the shaft axis through each stage without lateral deviation. Self-locking at 40:1 provides reliable holding without external brakes on our vertical positioning axes.”
Sergei Morozov — Industrial Machinery Plant
Russia
★★★★☆
“Installed in the inline shaft drive of our variable-speed damper actuators. Solid input shaft from belt drive, coaxial output to damper shaft — the most compact arrangement possible for our tight duct-side installation space. Low noise is essential for occupied building applications.”
Yuki Kobayashi — HVAC Equipment Manufacturing
Japan
Related Products & Accessories
⚙ Input Connection Options
Flexible jaw / disc / gear couplings for 11 mm solid shaft.
Chain sprockets (verify tension against Fri max 350 N).
V-belt and toothed belt pulleys.
Bearing support bracket for high-tension chain/belt inputs.
⚒ Output Options
■ Coaxial solid shaft (standard, 18 mm)
■ Coaxial output flange (FL suffix)
◆ DZ double shaft not available in NRV-E series
■ Torque arm for torque reaction mounting
◆ All Four 040-Frame Variants
■ EP-NRV-E040 — this unit (shaft in, coaxial out)
■ EP-NMRV-E040 — flange in, coaxial out
■ EP-NRV040 — shaft in, 90° right-angle out
■ EP-NMRV040 — flange in, 90° right-angle out
■ EP-NRV-E050 — next frame size up
Ready to Order the EP-NRV-E040?
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
