Descripción
EPNRV050 Shaft-Input Aluminium Worm Reducer — Overview
The EPNRV050 is the mid-range workhorse of Ever-power’s EPNRV shaft-input aluminium worm reducer series, purpose-built for packaging machinery retrofits, multi-speed food processing drive trains, and any application where the drive source is a chain sprocket, belt pulley, or flexible coupling rather than a direct IEC motor flange. At 3.5 kg and delivering up to 84 Nm at 30:1 ratio, the EPNRV050 integrates into existing machine frames where an NMRV motor-flange unit would require structural modification. Its 25 mm output shaft and four flange options give design engineers the connection flexibility expected of a modern industrial gearbox, without compromising on the compact, lightweight aluminium housing that makes the EPNRV series a market leader in shaft-input worm reducer applications.
EPNRV050 Technical Specifications
General Specifications
| Parameter | Value |
|---|---|
| Model | EPNRV050 |
| Maximum Output Torque (M2) | 84 Nm |
| Maximum Output Radial Force (Fr2) | 4280 N |
| Maximum Input Shaft Radial Force (Fr1) | 490 N |
| Available Gear Ratios (i) | 5, 7.5, 10, 15, 20, 25, 30, 40, 50, 60, 80, 100 |
| Output Shaft Diameter | 25 mm / 1.000 in |
| Input Shaft Diameter | 15.875 mm / 0.625 in |
| Input Type | Open shaft — no motor flange |
| Compatible Input Sources | V-belt pulley, chain sprocket, flexible coupling, line shaft |
| Unit Weight | 3.5 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 | 3.62 in | 92 mm |
| B – Body height | 3.31 in | 84 mm |
| J – Overall length | 4.76 in | 121 mm |
| Output shaft dia. | 1.000 in | 25.4 mm |
| Input shaft dia. | 0.625 in | 15.9 mm |
| Max input shaft radial load (Fr1) | – | 490 N |
| Max output shaft radial load (Fr2) | – | 4,280 N |
| Weight | – | 3.5 kg |
Performance Data — EPNRV050 (n1 = 1,400 rpm)
| Ratio (i) | n2 (rpm) | P1 (kW) | M2 (Nm) | Fr2 (N) | Fr1 (N) |
|---|---|---|---|---|---|
| 5 | 280 | 2.0 | 62 | 1577 | 350 |
| 7.5 | 186.7 | 1.6 | 71 | 1805 | 401 |
| 10 | 140 | 1.2 | 72 | 1987 | 490 |
| 15 | 93.3 | 0.9 | 74 | 2274 | 490 |
| 20 | 70 | 0.7 | 73 | 2503 | 490 |
| 25 | 56 | 0.5 | 70 | 2696 | 490 |
| 30 | 46.7 | 0.6 | 84 | 2865 | 490 |
| 40 | 35 | 0.4 | 76 | 3153 | 490 |
| 50 | 28 | 0.3 | 73 | 3397 | 490 |
| 60 | 23.3 | 0.3 | 68 | 3610 | 490 |
| 80 | 17.5 | 0.2 | 65 | 3973 | 490 |
| 100 | 14 | 0.2 | 55 | 4280 | 490 |
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 EPNRV050 and the EPNMRV050 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 EPNMRV050 has an integrated IEC/NEMA motor flange (VS) that attaches directly to a standard electric motor; the EPNRV050 instead has an open input shaft with keyway, accepting V-belt pulleys, chain sprockets, flexible couplings, or any other mechanical drive arrangement. Choose EPNMRV050 when driving from a standard IEC or NEMA motor; choose EPNRV050 when your input source is a belt drive, chain drive, hydraulic motor, servo drive with non-standard frame, or existing line shaft.
| Feature | EPNRV050 | EPNMRV050 |
|---|---|---|
| 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 490 N | N/A — load in motor bearing |
| Weight | 3.5 kg | 3.5 kg (identical) |
| Output shaft/flanges | Identical to EPNMRV050 | Identical to EPNRV050 |
Key Features & Benefits — EPNRV050
84 Nm for Packaging & Processing Chains
At 30:1 ratio the EPNRV050 delivers 84 Nm — higher than the equivalent NMRV at the same ratio due to the shaft-input efficiency advantage. This covers all standard packaging conveyor chain drives, case-packer indexing tables, and bottling carousel chain drives without oversizing.
490 N Fr1 — Multi-Groove Belt Drive Ready
The 490 N input shaft radial force rating supports multi-groove V-belt drives from motors up to 1.5 kW — covering the full input power range of the EPNRV050 with a single V-belt drive arrangement, no supplementary shaft support bearings required.
Food-Safe Sealed Housing for Chain Drives
The sealed exterior and food-grade synthetic oil fill mean the EPNRV050 can be positioned directly over food processing conveyors driven by chain, without the contamination risk that open gearboxes present. Multi-lip shaft seals keep lubricant internal, even under high-pressure washdown.
Retrofit-First Design Philosophy
The EPNRV050 is engineered to replace legacy worm reducers in ageing packaging and food processing equipment. The standard output shaft and flange dimensions match historical worm reducer footprints, allowing drop-in replacement without conveyor frame modification.
25 mm Output — Universal Processing Standard
The 25 mm output shaft diameter is the most common drive shaft size in food processing, packaging, and pharmaceutical equipment globally — accepting all standard coupling hubs, conveyor roller fittings, and chain sprocket bores without custom machining.
Application Scenarios — Where the EPNRV050 Excels
Packaging Machinery Chain-Drive Retrofits
Horizontal flow wrappers, thermoform-fill-seal machines, and case-packer indexing tables that use existing roller chain drive trains use the EPNRV050 as a drop-in speed reducer, driven from the machine’s existing chain drive without needing a new motor bracket. Keyword: shaft-input worm reducer for packaging machinery chain-drive retrofits
Food Processing Belt-Drive Upgrades
Meat portioning conveyors, bakery cooling tunnel chain drives, and vegetable washing line belt drives use the EPNRV050 to retrofit modern speed reduction into 20+ year-old food processing lines without replacing the motor mounting or conveyor frame. Keyword: sealed shaft-input worm gearbox for food processing line upgrades
Beverage Line Chain-Driven Drives
Bottle conveyor chain drives, fill-head rotator chain loops, and palletiser infeed conveyors in beverage plants use the EPNRV050 integrated into the existing plant chain layout — eliminating the need for new motor starters and cable runs by reusing the existing chain drive topology. Keyword: chain-drive worm reducer for beverage bottling line equipment
Pharmaceutical & Lab Equipment Drives
Tablet coating drum belt drives, blister-pack indexer chain drives, and clean-room conveyor belt systems in pharmaceutical facilities use the EPNRV050 for its sealed housing that survives IPA spray sanitisation — driven by servo motor via flexible coupling. Keyword: sealed shaft-input worm gearbox for pharmaceutical equipment drives
Selection Guide & Mounting Reference — EPNRV050
Model Selection Recommendation
Select the EPNRV050 when output torque is 55–84 Nm, the input source is a shaft (belt, chain, or coupling), and Fr1 ≤ 490 N. For direct IEC motor input, use the EPNMRV050 instead. Exceed 84 Nm? Step up to EPNRV063.
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 |
EPNRV050 vs EPNMRV050 — Head-to-Head Comparison
| Attribute | EPNRV050 | EPNMRV050 | Notes |
|---|---|---|---|
| Motor flange | None — shaft input | Integrated IEC/NEMA flange | Full drive-source flexibility |
| Fr1 (input radial) | Up to 490 N | N/A | Handles multi-groove V-belt |
| Max output torque | 84 Nm | 81 Nm (EPNMRV050) | Slightly higher without flange losses |
| Retrofit ease | Drop-in to existing chain/belt | Requires new motor mounting | Faster, no-weld retrofit |
| Weight | 3.5 kg | 3.5 kg (same housing) | Identical — only input differs |
Frequently Asked Questions — EPNRV050
What is the maximum output torque of the EPNRV050?
84 Nm at 30:1 ratio with n1 = 1,400 rpm input speed. This is slightly higher than the EPNMRV050’s 81 Nm due to the elimination of flange engagement losses. The 84 Nm capacity covers standard packaging conveyor chain drives, case-packer indexing, and bottling carousel applications.
What is the Fr1 rating for the EPNRV050?
The maximum input shaft radial force (Fr1) is 490 N. This is sufficient for a standard 4-groove B-section V-belt drive at typical pre-tension, or a single-strand ISO 10B roller chain at rated tension. If belt or chain forces exceed 490 N, mount a separate outboard bearing on the input shaft extension to support the additional load.
Can the EPNRV050 be driven by a variable-frequency drive (VFD) via belt?
Yes. Use a VFD to drive the input motor, connect the motor to the EPNRV050 input shaft via V-belt. The EPNRV050 accepts any input speed up to 1,400 rpm continuously, and can operate at reduced speed with reduced power. At speeds above 1,400 rpm, derate by 15% per 500 rpm above the reference speed.
Is the EPNRV050 suitable for use in a food processing clean environment?
Yes. The smooth external housing surface, multi-lip shaft seals, and food-grade synthetic oil fill meet HACCP hygiene requirements. The absence of a motor flange actually improves cleanability — there are no flange fastener pockets to trap food debris. The sealed housing survives standard CIP washdown cycles.
What output shaft options are available for the EPNRV050?
The standard solid output shaft is 25 mm (1.000 in). A hollow bore variant (24 mm H8) is available for shaft-mounting. Four output flange configurations (FA, FB, FC, FD) allow direct face-mounting to conveyor roller frames and chain sprocket hubs. All options are in-stock and available without long lead times.
Can I use the EPNRV050 with a hydraulic motor input?
Yes — a primary use case. Use a flexible jaw coupling between the hydraulic motor shaft and the EPNRV050 input shaft. Ensure the hydraulic motor’s shaft diameter matches a standard coupling insert bore range. The EPNRV050 input shaft (15.875 mm / 0.625 in) accommodates the output shafts of most low-speed hydraulic motors via standard couplings.
What lubrication does the EPNRV050 require?
Factory fill is ISO VG 220 synthetic gear oil — approximately 0.30 litres for horizontal B3 mounting. V5/V6 vertical orientations require 0.35–0.40 litres. In food processing applications replace oil annually; in other applications every 5,000 operating hours.
Customer Reviews — EPNRV050
★★★★★
“We retrofitted 12 EPNRV050 units into our cheese conveyor chain drives during a planned maintenance shutdown. The shaft-input design meant we could couple directly to the existing chain sprockets and finish the entire installation in 8 hours — versus the two days we expected for a full motor-flange replacement. Zero leaks after 18 months.”
Cheese conveyor chain-drive retrofit, Bega NSW — 12 units
Fiona M.
Bega Cheese Limited — Australia
★★★★★
“The EPNRV050 is our standard speed reducer for packaging machine chain-drive upgrades. The 25 mm output shaft fits our standard coupling catalogue without custom parts, and the 84 Nm torque covers every application in our flow-wrapper and thermoformer range without needing to upsize.”
Packaging machinery chain-drive, flow wrapper and thermoformer OEM
Lorenzo B.
Colussi Tecno-Pack S.r.l. — Italy
★★★★☆
“We use EPNRV050 units on our tablet coating drum drives, coupled to servo motors via flexible jaw couplings. The sealed housing handles our IPA spray cleaning routine without any issues. Good dimensional consistency across batches — important for our standardised machine platform.”
Pharmaceutical tablet coating drum belt-drive, Jiangsu province
Wei X.
Zhongde Pharmaceutical Equipment Co. — China
Related Products & Compatible Accessories
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EPNMRV050 — Motor-Flange Version
The EPNMRV050 is the motor-flange counterpart of the EPNRV050, sharing the same housing, worm gear, and output options but adding an IEC/NEMA VS motor flange for direct motor attachment. Choose EPNMRV050 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 EPNRV050 input shaft (15.875 mm / 0.625 in) are available from Ever-power. Verify the resultant belt or chain radial force does not exceed Fr1 = 490 N.
Flexible Couplings for Servo & Hydraulic Motors
Flexible jaw (Spider), bellows, and Oldham couplings in 15.875 mm / 0.625 in bore are available for connecting servo motors, hydraulic motors, and stepper motors to the EPNRV050 input shaft without motor-flange machining.
Output Flanges (FA / FB / FC / FD)
Multiple output flange options for the EPNRV050 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.
Mid-Range Shaft-Input Power for Food, Packaging & Pharma Drives
The EPNRV050 is in stock at Ever-power and ready to retrofit into your existing chain or belt drive system. Contact us for dimensional drawings, Fr1 calculation support, or custom shaft configurations.
