Descripción
EP-NRV-E090 Aluminium Coaxial Worm Gearbox — Solid Shaft Input, Inline Output
The EP-NRV-E090 is a heavy inline shaft drive aluminium worm gearbox and a heavy-duty inline shaft-coupled unit in the NRV-E series, built around a 090 mm worm gear centre distance. It represents the most specialised configuration in the four-variant series: combining the solid 28 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 mining coaxial conveyor shaft trains, crane inline shaft mechanisms, heavy extruder inline drives, and large shaft pump trains where the complete drive train must maintain a single shaft axis from source to load. With output torques up to 5000 Nm, ratios from 7.5–100:1, die-cast aluminium A360 housing, and IP65 shaft sealing, the EP-NRV-E090 serves heavy industrial inline shaft trains in mining and manufacturing across Australia and international markets. All six mounting positions are supported for maximum installation flexibility.
Technical Specifications — EP-NRV-E090
General Specifications
| Parameter | Specification |
|---|---|
| Model Number | EP-NRV-E090 |
| Series | NRV-E — Solid input shaft, coaxial inline output |
| Centre Distance | 090 mm |
| Output Configuration | Coaxial / Inline — same axis as input shaft |
| Max Output Torque | 5000 Nm |
| Reduction Ratios | 7.5–100:1 |
| Input Shaft Diameter | 28 mm solid |
| Input Shaft Keyway | 8×4.0 mm |
| Input Shaft Tolerance | h6 (precision ground) |
| Max Input Shaft Radial Load (Fri max) | 1270 N |
| Output Shaft Diameter | 45 mm (coaxial) |
| Max Recommended Input Power | 0.75 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, ~1.5 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 | ~18 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) |
|---|---|---|---|
| 10:1 | 140 | 3750 | 0.75 |
| 15:1 | 93 | 4160 | 0.75 |
| 20:1 | 70 | 4420 | 0.75 |
| 25:1 | 56 | 4865 | 0.75 |
| 30:1 | 47 | 5241 | 0.75 |
| 50:1 | 28 | 5799 | 0.75 |
| 60:1 | 23 | 6163 | 0.75 |
Core Features & Benefits
◯Solid Shaft Input + Coaxial Output — The Ultimate Inline Shaft Drive
The EP-NRV-E090 combines both specialised features: a solid 28 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-E090 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-E090 delivers the same 5000 Nm maximum output torque as the standard NRV090, NMRV090, and NMRV-E090 — 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 090-Frame Variants — Which One Is Right for You?
All four variants in the 090-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-E090 ▶ | EP-NMRV-E090 | EP-NRV090 | EP-NMRV090 |
|---|---|---|---|---|
| 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 | 5000 Nm | 5000 Nm | 5000 Nm | 5000 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-E090
The EP-NRV-E090is 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.
⚘ Mining Coaxial Conveyor Trains
Suitable NRV-E heavy solid shaft worm gearbox mining conveyor.
⚙ Crane Inline Shaft Mechanisms
Suitable coaxial shaft worm reducer crane inline mechanism.
⚚ Heavy Extruder Inline Drives
Suitable inline shaft worm gearbox extruder drive.
⚒ Large Shaft Pump Trains
Suitable NRV-E worm reducer large pump shaft train.
⚛ Heavy Industrial Inline Shafts
Suitable heavy solid shaft coaxial worm gearbox industrial.
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 7.5–100:1.
- 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 = 1270 N. Step up to EP-NRV-E110 if either limit is exceeded.
Input & Output Shaft Details
Input shaft: 28 mm solid solid | Keyway: 8×4.0 mm | Tolerance: h6 | Max radial load: 1270 N
Output shaft: 45 mm solid, coaxial (same axis as input) | With keyway | Standard solid shaft or FL flange option
45 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-E090
▶ What inline shaft-coupled drive applications suit the EP-NRV-E090?
The EP-NRV-E090 excels in mining coaxial conveyor shaft trains, crane inline shaft mechanisms, heavy extruder inline secondary drives, and large shaft pump inline trains — any application requiring heavy-duty shaft-to-shaft inline reduction (up to 5,000 Nm) where both the input shaft coupling and output shaft must remain on the same axis without a motor flange.
▶ What is the input shaft specification and key dimensions of the EP-NRV-E090?
Solid 28 mm input shaft with 8×4.0 mm keyway, h6 tolerance. Maximum input shaft radial load (Fri max) is 1,270 N. For heavy chain or belt-driven inputs approaching this limit, a bearing support bracket near the input sprocket or pulley is strongly recommended to protect the input shaft bearings.
▶ How does the NRV-E090 reduce drive train complexity in mining inline shaft systems?
In mining conveyor inline shaft drive trains, each reduction stage — from the primary reducer through to the conveyor drum — must remain on the same axis within the mine’s space constraints. The NRV-E090 slots directly into this shaft train: coupling input shaft to upstream, coaxial output shaft to downstream, delivering 5,000 Nm without introducing a 90-degree offset or a motor flange projection at any stage.
▶ What weight saving does the aluminium NRV-E090 provide for underground mining?
At approximately 18 kg, the NRV-E090 saves 30–40% in weight versus a comparable cast iron coaxial worm gearbox. Underground, every kilogram saved at shaft height eases installation and reduces structural demands on conveyor support structures — a significant advantage when replacing or installing drives in constrained underground headings.
▶ What sealing options are available for the EP-NRV-E090 in harsh mining environments?
Standard IP65 NBR double-lip shaft seals protect against water and moderate dust. Viton shaft seals (factory-fitted option) provide enhanced resistance to fine ore dust, abrasive particles, and chemical exposure for underground and open-cut mining conditions.
▶ What is the oil change interval for the EP-NRV-E090?
Every 5,000 hours with mineral ISO VG 220 oil, or up to 10,000 hours with synthetic oil. Holds approximately 1.5 litres in B3 orientation. In continuous 24-hour heavy mining operations, reduce the interval to 3,000 hours with mineral oil and inspect oil condition at each change for metal particle contamination.
Customer Reviews
★★★★★
“EP-NRV-E090 units installed as intermediate stages in our underground conveyor inline shaft drive trains. Solid input shaft couples to the primary gearbox, coaxial output continues to the conveyor drum — the entire drive train sits on one axis within our narrow heading profile. Weight saving versus cast iron is critical underground. Excellent reliability over 18 months of continuous operation.”
Craig Henderson — Underground Mining Services
Australia
★★★★★
“Specified for the intermediate stage in our heavy crane long-travel inline shaft drives. The NRV-E090 maintains the shaft axis from primary reducer to wheel axle without lateral offset. Self-locking at 50:1 provides reliable static holding. Two years of heavy port operations without a failure.”
Thomas Weber — Crane Systems Engineering
Germany
★★★★★
“Running in the inline shaft drive trains of our large water infrastructure pumping stations. Solid shaft input from belt drive, coaxial output to pump shaft — the most compact arrangement for our confined pump house space. Corrosion resistance in the coastal humid environment has been excellent.”
Moussa Traoré — Industrial Infrastructure
Senegal
Related Products & Accessories
⚙ Input Connection Options
Flexible jaw / disc / gear couplings for 28 mm solid shaft.
Chain sprockets (verify tension against Fri max 1270 N).
V-belt and toothed belt pulleys.
Bearing support bracket for high-tension chain/belt inputs.
⚒ Output Options
■ Coaxial solid shaft (standard, 45 mm)
■ Coaxial output flange (FL suffix)
◆ DZ double shaft not available in NRV-E series
■ Torque arm for torque reaction mounting
◆ All Four 090-Frame Variants
■ EP-NRV-E090 — this unit (shaft in, coaxial out)
■ EP-NMRV-E090 — flange in, coaxial out
■ EP-NRV090 — shaft in, 90° right-angle out
■ EP-NMRV090 — flange in, 90° right-angle out
■ EP-NRV-E110 — next frame size up
Ready to Order the EP-NRV-E090?
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
