คำอธิบาย
EP-NRV150 Aluminium Worm Gearbox — Overview
The EP-NRV150 is a flagship shaft-coupled aluminium worm gearbox — the largest shaft-input unit in the NRV series, engineered around a 150 mm worm gear centre distance. Unlike the NMRV series which features a hollow-bore IEC motor flange input, the NRV150 uses a solid 48 mm solid input shaft with a precision-ground keyway, making it purpose-built for belt-driven, chain-driven, and shaft-coupled drive systems across cement plant drive trains, mining crusher shaft drives, and large mixing gear systems. The solid shaft input eliminates the need for a motor flange adaptor, enabling shorter drive train layouts and seamless integration into multi-stage gear systems. With output torques up to 16500 Nm, reduction ratios from 7.5–100:1, and a die-cast aluminium A360 housing with IP65 shaft sealing, the EP-NRV150 delivers reliable, corrosion-resistant performance for cement plants, mining, and large industrial shaft-coupled systems. Six mounting positions and three output configurations give machine designers full layout flexibility across Australian and international installations.
Technical Specifications — EP-NRV150
General Specifications
| Parameter | Specification |
|---|---|
| Model Number | EP-NRV150 |
| Series | NRV — Solid input shaft, no motor flange |
| Centre Distance | 150 mm |
| Max Output Torque | 16500 Nm |
| Reduction Ratios | 7.5–100:1 |
| Input Shaft Diameter | 48 mm solid |
| Input Shaft Keyway | 14×5.5 mm |
| Input Shaft Tolerance | h6 (precision ground) |
| Max Input Shaft Radial Load (Fri max) | 2800 N |
| Output Shaft Diameter | 70 mm |
| Max Recommended Input Power | 3.0–15 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, ~5.0 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 | ~55 kg |
| Mounting Positions | B3, B6, B7, B8, V5, V6 |
| Output Configurations | Solid shaft / Double shaft (DZ) / Output flange (FL) |
| Input Connection | Solid shaft with keyway — use coupling, pulley, or sprocket |
| 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 | 6962 | 3.0 |
| 10:1 | 140 | 7663 | 3.0 |
| 15:1 | 93 | 8771 | 3.0 |
| 20:1 | 70 | 9654 | 3.0 |
| 25:1 | 56 | 10400 | 3.0 |
| 30:1 | 47 | 11051 | 3.0 |
| 40:1 | 35 | 12163 | 3.0 |
Core Features & Benefits
◯Solid Shaft Input — No Motor Flange Required
The EP-NRV150 solid 48 mm solid input shaft accepts standard couplings, pulleys, and chain sprockets directly. Ideal for belt/chain-driven systems and multi-stage gear trains where no IEC motor flange is needed — simplifying drive layout and reducing component count.
△Corrosion-Resistant Die-Cast Aluminium Housing
A360 die-cast aluminium provides inherent corrosion resistance for food processing washdowns, coastal Australian sites, and humid industrial environments. The baked enamel finish adds UV and chemical protection for outdoor and industrial installations.
◆Precision Ground Worm Shaft — Low Noise Operation
Ground worm shaft and precision-hobbed phosphor bronze wheel deliver smooth, low-noise torque transmission. Aluminium housing vibration damping further reduces structure-borne noise in printing, packaging, and textile machinery applications.
■Six Mounting Positions + Three Output Options
B3, B6, B7, B8, V5, V6 mounting orientations combined with solid shaft, double shaft (DZ), and output flange (FL) output options provide complete layout flexibility for complex multi-axis drive systems.
▶Static Self-Locking at Ratios ≥ 40:1
At ratios of 40:1 and above, worm geometry prevents back-drive under static load — simplifying gate actuators, conveyor braking systems, and positioning drives without an external holding brake.
●Superior Heat Dissipation — Extended Oil and Seal Life
Aluminium thermal conductivity (~160 W/m·K) dissipates gear-generated heat up to 3× faster than cast iron, keeping operating temperatures lower and extending lubricant life — critical for high-duty-cycle shaft-coupled drive applications.
EP-NRV150 vs EP-NMRV150 — Which Input Type is Right for You?
The NRV and NMRV series share identical worm sets, output shafts, housings, and torque ratings. The only difference is the input configuration. Use this comparison to select the right input type for your application.
| Feature | EP-NRV150 (Solid Shaft Input) | EP-NMRV150 (IEC Flange Input) |
|---|---|---|
| Input Connection | Solid shaft — coupling, pulley, sprocket | Hollow bore with IEC motor flange |
| Motor Mounting | No motor flange — flexible drive layout | Direct motor mounting via IEC flange |
| Best Application | Gear trains, belt/chain drives, multi-stage systems | Direct motor-to-gearbox mounting |
| Housing Material | Die-cast aluminium A360 | Die-cast aluminium A360 (same body) |
| Output Torque | Up to 16500 Nm (identical) | Up to 16500 Nm (identical) |
| Drive Train Length | Shorter — no motor/adaptor overhang | Slightly longer with motor mounted |
| Corrosion Resistance | Excellent — same aluminium housing | Excellent — same aluminium housing |
| IP Rating | IP65 shaft seals standard | IP65 shaft seals standard |
| Noise Level | Low — same worm set | Low — same worm set |
| Weight | ~55 kg | ~55 kg (same) |
Application Sectors — EP-NRV150
The EP-NRV150 solid-shaft worm gearbox is suited to the following industries and drive system types, each benefiting from direct shaft coupling without a motor flange.
⚘ Cement Plant Drive Trains
Suitable maximum torque NRV worm gearbox cement plant.
⚙ Mining Crusher Shafts
Suitable solid shaft worm reducer mining crusher.
⚚ Large Mixing Gear Systems
Suitable flagship shaft input worm gearbox mixing system.
⚒ Heavy Marine Drives
Suitable NRV worm reducer heavy marine drive.
⚛ Rolling Mill Trains
Suitable large NRV worm gearbox rolling mill shaft.
Selection Guide, Mounting Positions & Shaft Details
How to Select the Correct Ratio
- Calculate required output torque: M₂ = 9,550 × P (kW) / n₂ (rpm), then multiply by service factor (fs = 1.0–2.5).
- Determine actual input shaft speed: For belt/chain drives, n_input = n_motor × (D_motor pulley / D_NRV pulley). Use this as your input speed, not the motor rated speed.
- Find your ratio: i = n_input / n_output. Select the closest available ratio from 7.5–100:1.
- Confirm torque capacity: The selected ratio’s rated torque must exceed M₂ × fs. If not, step up to EP-NRV130.
- Check input shaft radial load: Calculate belt/chain tension force and verify it does not exceed Fri max = 2800 N.
Input & Output Shaft Details
Input shaft: 48 mm solid | Keyway: 14×5.5 mm | Tolerance: h6 | Max radial load: 2800 N
Mount couplings, pulleys, and sprockets directly. Use a keyway-secured locking collar or hub to prevent axial movement. Calculate input shaft radial load from belt/chain tension and verify against Fri max = 2800 N.
70 mm diameter with keyway. Single-sided. Default supply.
Shaft exits both sides. Bidirectional take-off. Suffix: DZ.
Direct bolt-on flange connection. Eliminates coupling. Suffix: FL.
Mounting Positions
| Position | Description | Shaft Orientation | Oil Level Note |
|---|---|---|---|
| B3 | Horizontal foot mount | Horizontal | Standard fill level — default factory supply |
| B6 | Foot mount, output shaft down | Vertical downward | Reduce oil by ~15% |
| B7 | Foot mount, output shaft up | Vertical upward | Increase oil by ~15% |
| B8 | Foot mount, output shaft horizontal (180°) | Horizontal reversed | Standard fill level |
| V5 | Flange mount, shaft down | Vertical downward | Reduce oil — check lubrication guide |
| V6 | Flange mount, shaft up | Vertical upward | Increase oil — check lubrication guide |
Frequently Asked Questions — EP-NRV150
▶ What is the maximum output torque of the EP-NRV150?
The EP-NRV150 is the largest unit in the NRV aluminium worm gearbox range, delivering up to approximately 16,500 Nm through a robust 70 mm output shaft. This makes it the flagship choice for cement plant conveyor drive trains, mining crusher secondary drives, and large-scale industrial mixing gear systems.
▶ What is the input shaft specification of the EP-NRV150?
The EP-NRV150 has a 48 mm solid input shaft with a 14×5.5 mm keyway. Maximum input radial load (Fri max) is 2,800 N. This large-diameter shaft accommodates the high torque loads transmitted by couplings and chain sprockets in cement and mining drive trains.
▶ How does the EP-NRV150 perform in dusty cement plant environments?
Standard IP65 shaft seals and baked enamel housing paint protect against fine cement dust ingress and alkaline chemical attack. Specify Viton seals for continuous high-temperature or chemically aggressive conditions. Schedule quarterly visual inspection of shaft seals in heavy dust environments.
▶ What motor connection method is used with the EP-NRV150 (no flange)?
The NRV150 uses a flexible or rigid shaft coupling on its 48 mm solid input shaft to connect to the motor or primary drive. For high-power motors (up to 15 kW), use a torque-rated flexible disc coupling or gear coupling to accommodate thermal expansion and minor shaft misalignment.
▶ What mounting positions are available for the EP-NRV150?
The EP-NRV150 supports all six standard positions: B3, B6, B7, B8, V5, and V6. B3 is the default. For V5 and V6 vertical orientations, adjust oil fill per the lubrication guide. The heavy 55 kg unit requires proper lifting equipment during installation.
▶ How does the NRV150 compare to the NMRV150 for large drive systems?
The NRV150 and NMRV150 share identical worm sets, output shafts, and torque ratings. The NRV150’s solid input shaft makes it ideal for multi-stage gear trains and shaft-coupled drives, while the NMRV150’s hollow bore flange suits direct motor mounting. Select NRV150 when power is sourced from a shaft; NMRV150 when a motor mounts directly.
Customer Reviews
★★★★★
“EP-NRV150 units are installed as the final reduction stage in our main raw meal conveyor gear trains at our Queensland cement plant. The solid 48 mm input shaft connects via a gear coupling to our primary reducer output. At 15 kW input and 20:1 ratio, torque output meets our full-load demand with margin. Exceptional performance in the alkaline dust environment.”
Robert Stevenson — Cement Industries Australia
Australia
★★★★★
“Installed in the crusher feed conveyor drive train at our iron ore mine in Siberia. Cold-start synthetic oil performance at -30°C ambient is impressive. IP65 sealing keeps fine ore dust completely out of the bearings. Zero failures across our fleet since installation.”
Alexei Volkov — Mining Equipment Factory
Russia
★★★★☆
“Our large mixing plant drive trains use EP-NRV150 units at 40:1 ratio. The solid shaft input couples cleanly into our multi-stage gear train. Self-locking at this ratio holds the mixing paddles during maintenance without a separate brake. Very satisfied with the torque density and build quality.”
Wang Fang — Heavy Industrial Machinery
China
Related Products & Accessories
⚙ Input Connection Options
Flexible jaw couplings and disc couplings for 48 mm solid shaft.
Chain sprockets and V-belt pulleys (calculate Fri against 2800 N max).
Toothed-belt pulley (verify radial load).
Bearing support bracket for high-tension chain/belt drives.
⚒ Output Accessories
■ Single solid output shaft (standard, 70 mm)
■ Double bidirectional shaft (DZ)
■ Output flange (FL)
■ Torque arm for torque reaction mounting
■ Dust cover for unused shaft end
◆ Related Series
■ EP-NMRV150 — hollow bore IEC flange input variant
■ EP-NRV-E150 — solid input, coaxial inline output
■ EP-NMRV-E150 — IEC flange input, coaxial output
■ EP-NRV130 — next frame size up
Ready to Order the EP-NRV150?
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
