Beschreibung
EPNRV075 Shaft-Input Aluminium Worm Reducer — Overview
The EPNRV075 is the most powerful unit in Ever-power’s EPNRV aluminium shaft-input worm reducer series, delivering up to 230 Nm of output torque from a 4.1 kW shaft input. At 9 kg with a 7,380 N output radial force capacity and the highest input shaft radial force rating in the series — 980 N — the EPNRV075 is engineered for heavy industrial belt-drive and chain-drive applications where the input shaft must carry the radial load of a large V-belt drive or multi-strand roller chain. Widely used across Australian resources, port handling, and heavy manufacturing industries, the EPNRV075 provides the maximum shaft-input torque available in a single-stage compact aluminium worm gearbox.
EPNRV075 Technical Specifications
General Specifications
| Parameter | Value |
|---|---|
| Model | EPNRV075 |
| Maximum Output Torque (M2) | 230 Nm |
| Maximum Output Radial Force (Fr2) | 7380 N |
| Maximum Input Shaft Radial Force (Fr1) | 980 N |
| Available Gear Ratios (i) | 7.5, 10, 15, 20, 25, 30, 40, 50, 60, 80, 100 |
| Output Shaft Diameter | 28 mm / 1.250 in |
| Input Shaft Diameter | 22.225 mm / 0.875 in |
| Input Type | Open shaft — no motor flange |
| Compatible Input Sources | V-belt pulley, chain sprocket, flexible coupling, line shaft |
| Unit Weight | 9 kg |
| Housing Material | Die-cast ADC12 aluminium alloy |
| Worm Wheel Material | High-tensile phosphor bronze |
| Worm Shaft Material | 20CrMnTi alloy steel — case-hardened & ground |
| Surface Finish | Two-coat baked epoxy-polyester |
| Standard Mounting | B3 foot / hollow bore with torque arm |
| Lubrication | ISO VG 220 synthetic gear oil |
| Reference Input Speed (n1) | 1,400 rpm (50 Hz 4-pole reference) |
Inch-Series Dimension Reference
| Dimension | Inch Value | Metric Equivalent |
|---|---|---|
| A – Body width | 4.72 in | 120 mm |
| B – Body height | 4.69 in | 119 mm |
| J – Overall length | 6.85 in | 174 mm |
| Output shaft dia. | 1.250 in | 31.75 mm |
| Input shaft dia. | 0.875 in | 22.2 mm |
| Max input shaft radial load (Fr1) | – | 980 N |
| Max output shaft radial load (Fr2) | – | 7,380 N |
| Weight | – | 9 kg |
Performance Data — EPNRV075 (n1 = 1,400 rpm)
| Ratio (i) | n2 (rpm) | P1 (kW) | M2 (Nm) | Fr2 (N) | Fr1 (N) |
|---|---|---|---|---|---|
| 7.5 | 186.7 | 4.1 | 185 | 2785 | 700 |
| 10 | 140 | 3.2 | 195 | 3065 | 830 |
| 15 | 93.3 | 2.3 | 200 | 3509 | 851 |
| 20 | 70 | 1.9 | 210 | 3862 | 980 |
| 25 | 56 | 1.5 | 200 | 4160 | 980 |
| 30 | 46.7 | 1.5 | 230 | 4421 | 980 |
| 40 | 35 | 1.1 | 220 | 4865 | 980 |
| 50 | 28 | 0.9 | 210 | 5241 | 980 |
| 60 | 23.3 | 0.8 | 200 | 5569 | 980 |
| 80 | 17.5 | 0.6 | 190 | 6130 | 980 |
| 100 | 14 | 0.5 | 180 | 6603 | 980 |
Fr2 = maximum radial force on output shaft. Fr1 = maximum radial force on input shaft (belt/chain tension resultant). Ensure both Fr1 and Fr2 values are not exceeded in your application.
EPNRV vs EPNMRV — What Is the Difference?
Both the EPNRV075 and the EPNMRV075 share the same die-cast aluminium housing, worm gear set, output shaft, output flange options, and sealing system. The single difference is at the input end: the EPNMRV075 has an integrated IEC/NEMA motor flange (VS) that attaches directly to a standard electric motor; the EPNRV075 instead has an open input shaft with keyway, accepting V-belt pulleys, chain sprockets, flexible couplings, or any other mechanical drive arrangement. Choose EPNMRV075 when driving from a standard IEC or NEMA motor; choose EPNRV075 when your input source is a belt drive, chain drive, hydraulic motor, servo drive with non-standard frame, or existing line shaft.
| Feature | EPNRV075 | EPNMRV075 |
|---|---|---|
| Input type | Open shaft (belt/chain/coupling) | IEC/NEMA motor flange (VS) |
| Motor frame compatibility | Any — via coupling | IEC/NEMA standard only |
| Hydraulic/servo motor use | Yes — flexible coupling | Only with adaptor plate |
| Retrofit ease into belt drives | High — direct sprocket mount | Requires motor bracket |
| Fr1 specification | Yes — rated 980 N | N/A — load in motor bearing |
| Weight | 9 kg | 9 kg (identical) |
| Output shaft/flanges | Identical to EPNMRV075 | Identical to EPNRV075 |
Key Features & Benefits — EPNRV075
230 Nm — Highest Torque in the EPNRV Range
At 30:1 ratio the EPNRV075 delivers 230 Nm from a 1.5 kW shaft input — the maximum single-stage output torque in the EPNRV aluminium shaft-input series. This covers heavy conveyor tail drives, large hoist mechanisms, and industrial agitators requiring more than the EPNRV063’s 160 Nm capacity.
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980 N Fr1 — Supports Large Belt Drives
The 980 N input shaft radial force rating is the highest in the EPNRV series. It supports multi-groove V-belt drives from motors up to 4.1 kW and heavy multi-strand roller chain drives from high-power line shafts — without requiring supplementary input-shaft support bearings in most standard belt drive configurations.
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7,380 N Fr2 for Direct Drum Drives
The reinforced output shaft bearing set supports 7,380 N radial force — handling the direct chain pull and drum tension forces on heavy conveyor head drives and hoist drum installations, making the EPNRV075 a true belt-drive alternative to cast-iron reducers in the 2–4 kW range.
⚖️
9 kg vs 25 kg — Same Torque Class
The EPNRV075 delivers 230 Nm at 9 kg — 64% lighter than an equivalent cast-iron unit. On overhead conveyor structures, elevated hoist points, and rotating equipment where mass is critical, this weight saving reduces structural steel costs and simplifies maintenance access.
Self-Locking at ≥ 30:1 for Inclined Drives
The EPNRV075’s inherent self-locking at ratios of 30:1 and above prevents load reversal on inclined conveyors, hoist mechanisms, and gravity-loaded actuators — providing a passive safety function valuable in installations driven via belt or chain from remotely located motors.
Application Scenarios — Where the EPNRV075 Excels
️ Heavy Belt-Drive Lifting & Hoist Systems
Platform hoist belt-drive mechanisms, dock leveller actuators with belt-drive motors, and stage machinery chain drives use the EPNRV075 connected via multi-groove V-belt to large electric motors. The 980 N Fr1 rating and self-locking at ≥ 30:1 ratio make it the preferred shaft-input reducer for inclined load-holding applications. Keyword: shaft-input worm gearbox for heavy belt-drive lifting and hoist systems
Heavy Industrial Belt-Drive Conveyors
Run-of-mine bulk material conveyors, quarry screening plant conveyors, and port bulk-cargo belt drives use the EPNRV075 as a belt-driven speed reducer connected to existing plant belt transmission systems. Each unit saves 15+ kg versus cast-iron equivalents on elevated conveyor structures. Keyword: heavy industrial belt-drive worm reducer for bulk material conveyor systems
Large Industrial Mixer Belt Drives
High-viscosity mixer belt drives, industrial kneader chain drives, and large-batch process agitator belt systems in chemical and food manufacturing plants use the EPNRV075 for its 230 Nm output and sealed housing, driven from existing plant belt or chain transmission without new motor mounting. Keyword: shaft-input worm reducer for large industrial mixer belt-drive systems
Port & Marine Belt-Drive Equipment
Port-side mooring winch belt drives, gangway positioning chain drives, and ship-to-shore conveyor belt systems use the EPNRV075 for its corrosion-resistant aluminium housing and 980 N Fr1 rating that accommodates the heavy V-belt tensions used in marine-grade drive systems. Keyword: corrosion-resistant shaft-input worm gearbox for port and marine belt-drive equipment
Selection Guide & Mounting Reference — EPNRV075
Model Selection Recommendation
Select the EPNRV075 when output torque is 180–230 Nm, input is shaft-driven (belt/chain/coupling), and Fr1 ≤ 980 N. For direct IEC motor input use EPNMRV075. The EPNRV075 is the maximum single-stage shaft-input capacity in the EPNRV range. Exceed 230 Nm? Consider EPNRV075 with pre-stage or EPNMRV090 with motor flange.
Mounting Positions & Lubrication Notes
| Mounting | Code | Oil Fill Note |
|---|---|---|
| Horizontal — foot down | B3 | Standard reference fill volume |
| Horizontal — foot right | B6 | Same as B3 |
| Horizontal — foot left | B7 | Same as B3 |
| Horizontal — foot up | B8 | Same as B3 |
| Vertical — output shaft down | V5 | Increase fill ~20% above B3 |
| Vertical — output shaft up | V6 | Increase fill ~25% above B3 |
EPNRV075 vs EPNMRV075 — Head-to-Head Comparison
| Attribute | EPNRV075 | EPNMRV075 | Notes |
|---|---|---|---|
| Motor flange | None — shaft input | Integrated IEC/NEMA flange | Large motor/drive-source flexibility |
| Fr1 (input radial) | 980 N — highest in series | N/A | Supports heavy multi-groove belts |
| Self-locking | Yes (≥ 30:1) | Yes (≥ 30:1) | Both hold inclined loads |
| Max output torque | 230 Nm | 261 Nm (EPNMRV075) | Slightly less, same housing |
| Weight | 9 kg | 9 kg (same housing) | Identical — only input differs |
Frequently Asked Questions — EPNRV075
What is the maximum output torque of the EPNRV075?
230 Nm at 30:1 ratio with n1 = 1,400 rpm input. At 20:1 ratio the output reaches 210 Nm. The EPNRV075 is the highest-torque model in the EPNRV shaft-input series — for higher torque with shaft input, consider the EPNRV075 in a compound arrangement or use the EPNMRV090 flanged unit.
What is the Fr1 input shaft radial force rating?
980 N — the highest in the EPNRV series. This supports a standard 6-groove A-section or 4-groove B-section V-belt drive from a 4.1 kW motor without supplementary input bearing support. For chain drives, 980 N covers a single-strand ISO 12B roller chain at rated tension from a 15-tooth sprocket at 1,400 rpm.
How do I calculate whether my belt drive load is within Fr1?
Calculate the effective belt pull (F_e = P × 1000 / v, where P is kW and v is belt speed in m/s). Add the tensile pre-load to get total shaft radial force. If the resultant exceeds 980 N, either increase the pulley diameter to reduce belt force, add a third bearing to support the input shaft, or use a chain drive with lower resultant radial force.
Can the EPNRV075 be used as a hoist drive via belt input?
Yes, with appropriate engineering. The self-locking property at ≥ 30:1 provides passive load holding, and the 7,380 N Fr2 rating handles hoist drum radial loads. Confirm the safety factor (f.s.) in the performance table is ≥ 1.5 for the selected operating condition, and provide a secondary mechanical lock as required by the applicable lifting equipment standard.
What is the output shaft diameter?
28 mm metric (1.250 in inch series) with an 8 mm keyway. This matches the standard bore of heavy conveyor drive sprockets and industrial coupling hubs used in the 2–4 kW power range — accepting standard market components without custom machining.
Is a hollow output bore available for the EPNRV075?
Yes. The hollow bore variant (35 mm H8 metric) allows direct shaft mounting on conveyor head drums, eliminating output shaft couplings. A torque arm assembly is included to react output torque against the machine frame — ideal for belt-conveyor head-drum direct-drive installations.
What lubrication is required for the EPNRV075?
Approximately 0.8 litres of ISO VG 220 synthetic gear oil for horizontal B3 mounting; 0.95–1.0 litres for V5/V6 vertical orientations. In heavy belt-drive duty at high ambient temperatures, use ISO VG 220 full synthetic oil for better viscosity stability and longer oil change intervals.
Customer Reviews — EPNRV075
★★★★★
“We replaced cast-iron reducers with EPNRV075 units on our coal preparation plant belt-conveyor tail drives at Goonyella. The 9 kg mass saved us significant rigging time on the elevated conveyor structure, and the 980 N Fr1 rating handles our 4-groove V-belt drive from the plant motor room without input bearing issues.”
Coal belt-conveyor tail drives, Goonyella Riverside mine, QLD
Shane B.
BHP Mitsubishi Alliance — Australia
★★★★★
“Using EPNRV075 units on our vessel gangway positioning chain drives. The corrosion-resistant aluminium housing and shaft-input design (we use hydraulic motors for position control) make it the only product in this torque class that meets our weight and input-source requirements simultaneously. No issues after 24 months.”
Offshore gangway positioning chain drive, Rotterdam service fleet
Erik V.
Van Oord Offshore B.V. — Netherlands
★★★★☆
“The EPNRV075 runs our large industrial dough mixer belt drive at 30:1 ratio. The 230 Nm output handles cold-dough start-up torque without the belt-slip issues we had with our previous undersized reducer. The 980 N Fr1 rating accommodates our 5-groove A-belt drive comfortably — no extra shaft support bearing needed.”
Industrial dough mixer belt drive, bakery equipment manufacturing, Guangzhou
Chen W.
Guangzhou Zhongnan Industrial — China
Related Products & Compatible Accessories
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EPNMRV075 — Motor-Flange Version
The EPNMRV075 is the motor-flange counterpart of the EPNRV075, sharing the same housing, worm gear, and output options but adding an IEC/NEMA VS motor flange for direct motor attachment. Choose EPNMRV075 when your drive source is a standard IEC or NEMA motor.
V-Belt Pulleys & Chain Sprockets
Standard stock-bore V-belt pulleys and ISO roller chain sprockets for the EPNRV075 input shaft (22.225 mm / 0.875 in) are available from Ever-power. Verify the resultant belt or chain radial force does not exceed Fr1 = 980 N.
Flexible Couplings for Servo & Hydraulic Motors
Flexible jaw (Spider), bellows, and Oldham couplings in 22.225 mm / 0.875 in bore are available for connecting servo motors, hydraulic motors, and stepper motors to the EPNRV075 input shaft without motor-flange machining.
Output Flanges (FA / FB / FC / FD)
Multiple output flange options for the EPNRV075 allow direct face-mounting to conveyor roller frames, agitator shaft hubs, and indexed disc assemblies. Hollow bore with torque arm also available.
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Torque Arms & Backstop Assemblies
Torque arm brackets for hollow-bore shaft mounting and mechanical backstops to prevent reverse rotation on inclined drives are available as factory-fitted or separately supplied accessories.
Maximum Shaft-Input Torque for Heavy Industry & Resources
The EPNRV075 delivers 230 Nm from any belt, chain, or coupling input source. Contact Ever-power for Fr1 belt-drive calculation support, hollow bore options, or volume supply pricing for mining and port equipment projects.
