Beschreibung
EP-NRV075 Aluminium Worm Gearbox — Overview
The EP-NRV075 is a high-torque direct drive aluminium worm gearbox — a high-torque direct-drive unit in the NRV series, engineered around a 075 mm worm gear centre distance. Unlike the NMRV series which features a hollow-bore IEC motor flange input, the NRV075 uses a solid 24 mm solid input shaft with a precision-ground keyway, making it purpose-built for belt-driven, chain-driven, and shaft-coupled drive systems across stone saw gear trains, metal forming lines, bulk material handling, and water treatment. 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 3000 Nm, reduction ratios from 7.5–100:1, and a die-cast aluminium A360 housing with IP65 shaft sealing, the EP-NRV075 delivers reliable, corrosion-resistant performance for shaft-coupled drives on heavy forming and processing machinery. Six mounting positions and three output configurations give machine designers full layout flexibility across Australian and international installations.
Technical Specifications — EP-NRV075
General Specifications
| Parameter | Specification |
|---|---|
| Model Number | EP-NRV075 |
| Series | NRV — Solid input shaft, no motor flange |
| Centre Distance | 075 mm |
| 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 |
| 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 | ~11 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 | 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 — No Motor Flange Required
The EP-NRV075 solid 24 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-NRV075 vs EP-NMRV075 — 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-NRV075 (Solid Shaft Input) | EP-NMRV075 (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 3000 Nm (identical) | Up to 3000 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 | ~11 kg | ~11 kg (same) |
Application Sectors — EP-NRV075
The EP-NRV075 solid-shaft worm gearbox is suited to the following industries and drive system types, each benefiting from direct shaft coupling without a motor flange.
⚘ Stone Saw Gear Trains
Suitable high torque solid shaft worm gearbox stone saw.
⚙ Metal Forming Lines
Suitable NRV worm reducer metal forming gear train.
⚚ Bulk Material Handling
Suitable direct drive worm gearbox bulk material handling.
⚒ Water Treatment
Suitable solid shaft worm reducer water treatment.
⚛ Large Conveyor Drives
Suitable NRV worm gearbox large conveyor shaft drive.
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-NRV090.
- Check input shaft radial load: Calculate belt/chain tension force and verify it does not exceed Fri max = 980 N.
Input & Output Shaft Details
Input shaft: 24 mm solid | Keyway: 8×4.0 mm | Tolerance: h6 | Max radial load: 980 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 = 980 N.
35 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-NRV075
▶ Why is the EP-NRV075 preferred for stone saw and metal forming gear trains?
The EP-NRV075’s solid 24 mm input shaft withstands the high radial and axial loads common in stone saw arbor drives and metal forming roll feeds. Its maximum input shaft radial load (Fri max) of 980 N and robust die-cast housing handle the sustained heavy shaft loads typical of these processes.
▶ What coupling type is recommended for the EP-NRV075 input shaft?
For motor-to-gearbox connection, use a flexible jaw coupling or grid coupling on the 24 mm input shaft to accommodate minor shaft misalignment. For chain-driven inputs, select a hardened chain sprocket and calculate chain tension carefully — Fri max is 980 N. Avoid rigid couplings unless shaft alignment is precise.
▶ What is the maximum output torque of the EP-NRV075?
The EP-NRV075 delivers up to 3,000 Nm of output torque. This is approximately double the NRV063 capacity, with a larger 35 mm output shaft and maximum output radial load (Fre max) of 7,380 N — enabling direct sprocket or pulley mounting without external bearing support in most applications.
▶ What lubricant volume does the EP-NRV075 require?
The EP-NRV075 holds approximately 1.0 litre of ISO VG 220 worm gear oil in B3 horizontal orientation. Synthetic oils (e.g., Shell Omala S4 GX 220) are recommended for extended service intervals and high-temperature or high-cycle applications.
▶ How do I calculate the correct service factor for the EP-NRV075?
Determine your daily operating hours and load class (A: uniform, B: moderate shock, C: heavy shock) from the service factor chart. For 8-hour uniform-load operation, fs ≥ 1.0. For 24-hour continuous operation with moderate shock, fs ≥ 1.8. Multiply required output torque by fs before comparing to the selection table.
▶ Can the EP-NRV075 be used in a vertical shaft orientation for water treatment aerators?
Yes. V5 and V6 vertical orientations are fully supported. In V6 (shaft up), increase the oil fill slightly above the B3 level. In V5 (shaft down), reduce slightly. The IP65 sealed output shaft prevents water ingress in the humid water treatment environment.
Customer Reviews
★★★★★
“EP-NRV075 units drive the saw blade feed gear trains on our granite slab cutters. The 24 mm input shaft connects via gear coupling to our primary drive — the unit handles the heavy radial loads from the blade arbor chain drive without any shaft deflection. Six months of hard use and running perfectly.”
Scott Williams — Stone & Tile Processing Pty
Australia
★★★★★
“Used in the roll feed drive trains of our metal profile bending lines. The high radial load capacity allows direct sprocket mounting on the solid input shaft without additional support. Excellent build quality and consistent performance.”
Igor Petrov — Metal Forming Equipment
Ukraine
★★★★☆
“Installed as the final drive stage on slow-speed surface aerators at our municipal water treatment plant. The 75:1 ratio delivers the precise shaft speed required. Aluminium housing resists the chemical splash environment — better than the cast iron units it replaced.”
Liu Yang — Water Treatment Engineering
China
Related Products & Accessories
⚙ Input Connection Options
Flexible jaw couplings and disc couplings for 24 mm solid shaft.
Chain sprockets and V-belt pulleys (calculate Fri against 980 N max).
Toothed-belt pulley (verify radial load).
Bearing support bracket for high-tension chain/belt drives.
⚒ Output Accessories
■ Single solid output shaft (standard, 35 mm)
■ Double bidirectional shaft (DZ)
■ Output flange (FL)
■ Torque arm for torque reaction mounting
■ Dust cover for unused shaft end
◆ Related Series
■ EP-NMRV075 — hollow bore IEC flange input variant
■ EP-NRV-E075 — solid input, coaxial inline output
■ EP-NMRV-E075 — IEC flange input, coaxial output
■ EP-NRV090 — next frame size up
Ready to Order the EP-NRV075?
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
