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EP-NRV-E075 Aluminium Coaxial Worm Gearbox — Solid Shaft Input, Inline Output
The EP-NRV-E075 is a high-torque inline shaft-coupled aluminium worm gearbox and a high-torque inline shaft-coupled unit in the NRV-E series, built around a 075 mm worm gear centre distance. It represents the most specialised configuration in the four-variant series: combining the solid 24 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 stone saw inline shaft trains, metal forming coaxial drives, bulk handling inline shaft systems, and water treatment trains where the complete drive train must maintain a single shaft axis from source to load. With output torques up to 3000 Nm, ratios from 7.5–100:1, die-cast aluminium A360 housing, and IP65 shaft sealing, the EP-NRV-E075 serves high-torque inline shaft trains on stone, metal forming, and bulk handling machinery across Australia and international markets. All six mounting positions are supported for maximum installation flexibility.
Technical Specifications — EP-NRV-E075
General Specifications
| Parameter | Specification |
|---|---|
| Model Number | EP-NRV-E075 |
| Series | NRV-E — Solid input shaft, coaxial inline output |
| Centre Distance | 075 mm |
| Output Configuration | Coaxial / Inline — same axis as input shaft |
| Max Output Torque | 3000 Nm |
| Reduction Ratios | 7.5–100:1 |
| Input Shaft Diameter | 24 mm solid |
| Input Shaft Keyway | 8×4.0 mm |
| Input Shaft Tolerance | h6 (precision ground) |
| Max Input Shaft Radial Load (Fri max) | 980 N |
| Output Shaft Diameter | 35 mm (coaxial) |
| Max Recommended Input Power | 0.55 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, ~1.0 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 | ~12.5 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 | 1805 | 0.55 |
| 10:1 | 140 | 1987 | 0.55 |
| 15:1 | 93 | 2274 | 0.55 |
| 20:1 | 70 | 2503 | 0.55 |
| 25:1 | 56 | 2696 | 0.55 |
| 30:1 | 47 | 2865 | 0.55 |
| 50:1 | 28 | 3153 | 0.55 |
Core Features & Benefits
◯Solid Shaft Input + Coaxial Output — The Ultimate Inline Shaft Drive
The EP-NRV-E075 combines both specialised features: a solid 24 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-E075 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-E075 delivers the same 3000 Nm maximum output torque as the standard NRV075, NMRV075, and NMRV-E075 — 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 075-Frame Variants — Which One Is Right for You?
All four variants in the 075-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-E075 ▶ | EP-NMRV-E075 | EP-NRV075 | EP-NMRV075 |
|---|---|---|---|---|
| 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 | 3000 Nm | 3000 Nm | 3000 Nm | 3000 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-E075
The EP-NRV-E075 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.
⚘ Stone Saw Inline Shaft Trains
Suitable NRV-E high torque solid shaft worm gearbox stone saw.
⚙ Metal Forming Coaxial Drives
Suitable coaxial shaft worm reducer metal forming inline.
⚚ Bulk Handling Inline Shafts
Suitable inline shaft worm gearbox bulk handling.
⚒ Water Treatment Inline Trains
Suitable NRV-E worm reducer water treatment inline train.
⚛ Large Conveyor Shaft Drives
Suitable solid shaft coaxial worm gearbox large conveyor.
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 = 980 N. Step up to EP-NRV-E090 if either limit is exceeded.
Input & Output Shaft Details
Input shaft: 24 mm solid solid | Keyway: 8×4.0 mm | Tolerance: h6 | Max radial load: 980 N
Output shaft: 35 mm solid, coaxial (same axis as input) | With keyway | Standard solid shaft or FL flange option
35 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-E075
▶ Why is the EP-NRV-E075 used in stone saw inline shaft trains?
Stone saw drive trains require all drive components to align along one shaft axis through the saw frame. The NRV-E075 solid 24 mm input shaft connects via coupling to the primary gearbox output, and the coaxial 35 mm output shaft connects to the stone saw blade shaft — maintaining the inline drive axis while delivering up to 3,000 Nm. Maximum input shaft radial load (Fri max) of 980 N handles chain sprocket inputs on mid-sized stone saws.
▶ What lubricant and quantity does the EP-NRV-E075 require?
Approximately 1.0 litre of ISO VG 220 worm gear oil (e.g., Shell Omala S4 GX 220) for B3 horizontal mounting. For V5/V6 vertical orientations, refer to the NRV-E lubrication diagram for the correct fill level, which differs from the standard NRV diagram in the coaxial configuration.
▶ How does the NRV-E075 compare to the NMRV-E075 for inline drives?
Both units feature coaxial inline output and deliver the same 3,000 Nm. The NMRV-E075 has a hollow bore IEC motor flange input; the NRV-E075 has a solid input shaft for shaft-coupled or belt/chain drive inputs. Choose NRV-E075 when the drive source is a shaft, not a directly-flanged motor.
▶ What is the self-locking performance of the EP-NRV-E075?
Static self-locking (η < 0.5) is present at gear ratios of 40:1 and above, identical to other NRV and NMRV-E units. For safety-critical vertical load retention in inline shaft drive trains, always install a certified external holding brake regardless of gear ratio.
▶ How do I connect a chain sprocket to the EP-NRV-E075 input shaft?
Mount a chain sprocket with 24 mm bore directly onto the input shaft with the 8×4.0 mm key. Calculate chain tension radial force: Fre = M × 2000 × fs / (d × fz), where fz = 1.0–1.25 for standard chain. Verify the result does not exceed Fri max = 980 N. For higher chain tensions, add a bearing support bracket adjacent to the sprocket.
▶ What output shaft options are available for the EP-NRV-E075?
Standard coaxial solid shaft (35 mm with keyway) and output flange (FL suffix) for direct bolt-on connection. The DZ double output shaft is not available in the NRV-E coaxial series. The FL flange output is particularly useful for connecting the NRV-E075 coaxially to drum flanges or large flange couplings in stone and metal processing drive trains.
Customer Reviews
★★★★★
“EP-NRV-E075 units form the intermediate reduction stage in our stone conveyor inline shaft drive trains. Solid input shaft connects to the primary gearbox via disc coupling, coaxial output continues to the stone conveyor drive shaft. 3,000 Nm capacity handles our heavy slab loads without strain. Outstanding reliability in the stone dust environment.”
Ian Mackay — Stone Processing Pty Ltd
Australia
★★★★★
“Integrated into the coaxial drive shaft of our heavy profile bending line. The NRV-E075 receives input from an upstream roller coupling and delivers coaxially to the forming roll shaft — no lateral offset. High radial load capacity allows direct sprocket mounting. Very impressed with build quality and torque consistency.”
Viktor Novak — Metal Forming Technologies
Czech Republic
★★★★☆
“Used in the inline shaft drive of our slow-speed surface aerators. The NRV-E075 connects the primary gearbox output to the aerator shaft coaxially — maintaining the compact vertical inline drive profile. Aluminium housing resists the chemical environment. Running reliably at 75:1 ratio for over two years.”
Sun Wei — Water Treatment Engineering
China
Related Products & Accessories
⚙ Input Connection Options
Flexible jaw / disc / gear couplings for 24 mm solid shaft.
Chain sprockets (verify tension against Fri max 980 N).
V-belt and toothed belt pulleys.
Bearing support bracket for high-tension chain/belt inputs.
⚒ Output Options
■ Coaxial solid shaft (standard, 35 mm)
■ Coaxial output flange (FL suffix)
◆ DZ double shaft not available in NRV-E series
■ Torque arm for torque reaction mounting
◆ All Four 075-Frame Variants
■ EP-NRV-E075 — this unit (shaft in, coaxial out)
■ EP-NMRV-E075 — flange in, coaxial out
■ EP-NRV075 — shaft in, 90° right-angle out
■ EP-NMRV075 — flange in, 90° right-angle out
■ EP-NRV-E090 — next frame size up
Ready to Order the EP-NRV-E075?
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
