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EPNRV030 Shaft-Input Aluminium Worm Reducer — Overview
The EPNRV030 is the compact entry point in Ever-power’s EPNRV aluminium shaft-input worm reducer series, distinguished from the EPNMRV030 by its open shaft input design — no integrated motor flange is included. This architecture makes the EPNRV030 uniquely flexible: it accepts input from V-belt drives, roller chain sprockets, flexible couplings, and line shafts, giving machine designers the freedom to specify virtually any rotary drive source. Weighing just 1.2 kg and delivering up to 21 Nm of output torque across eleven standard reduction ratios, the EPNRV030 is the preferred choice for light textile machinery, printing and labelling equipment, and conveyor retrofit projects where the existing drive source cannot be changed to a standard IEC motor-flange format.
EPNRV030 Technical Specifications
General Specifications
| Parameter | Value |
|---|---|
| Model | EPNRV030 |
| Maximum Output Torque (M2) | 21 Nm |
| Maximum Output Radial Force (Fr2) | 1504 N |
| Maximum Input Shaft Radial Force (Fr1) | 210 N |
| Available Gear Ratios (i) | 5, 7.5, 10, 15, 20, 25, 30, 40, 50, 60, 80 |
| Output Shaft Diameter | 16 mm / 0.625 in |
| Input Shaft Diameter | 9.525 mm / 0.375 in |
| Input Type | Open shaft — no motor flange |
| Compatible Input Sources | V-belt pulley, chain sprocket, flexible coupling, line shaft |
| Unit Weight | 1.2 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 | 2.48 in | 63 mm |
| B – Body height | 2.24 in | 57 mm |
| J – Overall length | 3.15 in | 80 mm |
| Output shaft dia. | 0.625 in | 15.9 mm |
| Input shaft dia. | 0.375 in | 9.5 mm |
| Max input shaft radial load (Fr1) | – | 210 N |
| Max output shaft radial load (Fr2) | – | 1,504 N |
| Weight | – | 1.2 kg |
Performance Data — EPNRV030 (n1 = 1,400 rpm)
| Ratio (i) | n2 (rpm) | P1 (kW) | M2 (Nm) | Fr2 (N) | Fr1 (N) |
|---|---|---|---|---|---|
| 5 | 280 | 0.6 | 18 | 597 | 150 |
| 7.5 | 186.7 | 0.4 | 18 | 683 | 150 |
| 10 | 140 | 0.3 | 18 | 752 | 169 |
| 15 | 93.3 | 0.2 | 18 | 861 | 169 |
| 20 | 70 | 0.2 | 18 | 948 | 190 |
| 25 | 56 | 0.2 | 21 | 1021 | 210 |
| 30 | 46.7 | 0.2 | 20 | 1085 | 210 |
| 40 | 35 | 0.1 | 18 | 1194 | 210 |
| 50 | 28 | 0.1 | 17 | 1286 | 210 |
| 60 | 23.3 | 0.1 | 16 | 1367 | 210 |
| 80 | 17.5 | 0.1 | 13 | 1504 | 210 |
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 EPNRV030 and the EPNMRV030 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 EPNMRV030 has an integrated IEC/NEMA motor flange (VS) that attaches directly to a standard electric motor; the EPNRV030 instead has an open input shaft with keyway, accepting V-belt pulleys, chain sprockets, flexible couplings, or any other mechanical drive arrangement. Choose EPNMRV030 when driving from a standard IEC or NEMA motor; choose EPNRV030 when your input source is a belt drive, chain drive, hydraulic motor, servo drive with non-standard frame, or existing line shaft.
| Feature | EPNRV030 | EPNMRV030 |
|---|---|---|
| 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 210 N | N/A — load in motor bearing |
| Weight | 1.2 kg | 1.2 kg (identical) |
| Output shaft/flanges | Identical to EPNMRV030 | Identical to EPNRV030 |
Key Features & Benefits — EPNRV030
Universal Shaft-Input Flexibility
Without an integrated motor flange, the EPNRV030 accepts any rotary input source — V-belt pulley, roller chain sprocket, flexible jaw coupling, or direct line-shaft key — giving machine designers and plant retrofit engineers complete freedom to use existing drive components.
Ideal for Brownfield Retrofits
The EPNRV030 slides into existing machine frames where a standard IEC motor-flanged NMRV unit would require structural modification. For upgrading old textile looms, labelling machines, and small conveyors with modern speed reduction, the EPNRV030 requires only a shaft coupling or sprocket — no new motor bracket.
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1.2 kg — Lightest in Its Torque Class
At 1.2 kg the EPNRV030 is the lightest shaft-input worm reducer offering 20+ Nm output torque. Ideal for mounting on moving machine members, overhead line shafts with weight restrictions, and portable dispensing equipment.
Self-Locking at Ratios ≥ 30:1
The worm lead angle at 30:1 and above produces inherent self-locking, preventing output-load back-drive. This eliminates the need for a ratchet or separate brake in conveyor hold-and-inch applications and gravity-loaded dispensing machines.
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IP54 Sealed for Multi-Environment Use
Double-lip output shaft seals and a sealed housing joint protect internal components from the textile lint, paper dust, and food particle contamination present in the EPNRV030’s typical operating environments.
Application Scenarios — Where the EPNRV030 Excels
Textile Machinery & Loom Drives
Light textile machinery, fabric winding machines, and knitting loom drive shafts use the EPNRV030 as a low-profile speed reducer driven directly from the machine’s existing line-shaft via a roller chain sprocket. The 1.2 kg mass keeps overall shaft loading within the loom frame’s design limits. Keyword: compact shaft-input worm gearbox for textile machinery
️ Labelling & Print Equipment Retrofits
Label applicator timing drives, screen-printing squeegee feeds, and rotary die-cut infeed units use the EPNRV030’s shaft input to integrate into existing belt-driven print equipment without replacing motor mounting structures. Keyword: shaft-input worm reducer for labelling and printing machine retrofits
Food Equipment Speed Reduction
Small food dispensing equipment, sauce portioning drives, and bakery deck chain drives use the EPNRV030 driven from existing equipment chain sprockets. The sealed aluminium housing resists food-area washdown. Keyword: shaft-input aluminium worm reducer for food equipment retrofits
Precision Instrument & Automation Drives
Camera positioning systems, coordinate measurement machine drives, and precision actuator tables use the EPNRV030 with direct shaft coupling to servo and stepper motors that lack standard IEC frame dimensions. Keyword: worm speed reducer for precision instrument and servo motor drives
Selection Guide & Mounting Reference — EPNRV030
Model Selection Recommendation
Select the EPNRV030 when output torque is 13–21 Nm, the drive source is a shaft (belt, chain, or coupling), and input speed is ≤ 1,400 rpm. If the input is a standard IEC/NEMA motor, the EPNMRV030 with integrated flange is more suitable. If torque exceeds 21 Nm, step up to the EPNRV040.
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 |
EPNRV030 vs EPNMRV030 — Head-to-Head Comparison
| Attribute | EPNRV030 | EPNMRV030 | Notes |
|---|---|---|---|
| Motor flange | None — shaft input | Integrated IEC/NEMA flange | More drive-source flexibility |
| Input radial load (Fr1) | Up to 210 N rated | N/A — shaft in motor bearing | Supports belt/chain drive input |
| Retrofit ease | High — couples to existing shafts | Requires new motor bracket | Lower installation cost on refits |
| Drive source options | Belt, chain, coupling, line shaft | Standard IEC/NEMA motor only | Broadest application range |
| Weight | 1.2 kg | 1.2 kg (same housing) | Identical — only input differs |
Frequently Asked Questions — EPNRV030
How is the EPNRV030 different from the EPNMRV030?
The EPNRV030 uses an open shaft input — no integrated motor flange. The housing, worm gear set, bearings, and seals are identical to the EPNMRV030. The EPNRV030 is driven by belt pulleys, chain sprockets, or couplings mounted directly on the input shaft, while the EPNMRV030 attaches directly to an IEC or NEMA motor via its VS flange.
What is the Fr1 specification and how do I use it?
Fr1 is the maximum allowable radial force on the EPNRV030 input shaft — 210 N at the shaft end for ratios 25:1 and above. When designing a belt or chain drive to the EPNRV030, calculate the resultant belt tension or chain pull force on the input shaft and confirm it does not exceed Fr1. Exceeding Fr1 accelerates input shaft bearing wear.
Can I use a V-belt pulley on the EPNRV030 input?
Yes. Mount a standard 14 mm bore (metric) or 3/8 in bore (inch-series) V-belt pulley on the input shaft using the keyway provided. Calculate belt tension to confirm the resultant radial force on the input shaft does not exceed Fr1 = 210 N. Use a minimum pulley pitch diameter of 40 mm to limit belt wrap angle and reduce the shaft cantilever moment.
What is the input shaft diameter and keyway size?
The metric input shaft is 9 mm diameter with a 3 mm keyway. The inch-series shaft is 0.375 in with a 3/32 in keyway. Both accept standard stock-bore sprockets and pulleys available from industrial supply distributors without custom machining.
Can the EPNRV030 be driven by a stepper or servo motor with a non-standard frame?
Yes — this is a primary use case for the EPNRV series. Use a flexible jaw coupling between the servo/stepper motor output shaft and the EPNRV030 input shaft. Ensure coupling alignment is within ±0.1 mm radial and ±0.5° angular misalignment. The EPNRV030’s shaft input accommodates any motor shaft diameter within the coupling’s bore range.
Is the EPNRV030 self-locking?
At ratios of 30:1 and above, the EPNRV030 is self-locking under static conditions. The output load cannot back-drive the worm shaft, eliminating the need for a separate ratchet or brake in hold-and-position applications.
What lubrication does the EPNRV030 require?
The factory fill is ISO VG 220 synthetic gear oil — approximately 0.11 litres for horizontal B3 mounting. Adjust fill volume for vertical V5/V6 orientations per the lubrication chart. The sealed housing is maintenance-free under standard conditions; inspect oil annually in continuous-duty applications.
Customer Reviews — EPNRV030
★★★★★
“The EPNRV030 solved our loom modernisation project perfectly. We needed a speed reducer that could mount directly on the existing line shaft without changing the motor mounting structure. The 0.375 in shaft with keyway bolts straight onto our standard roller chain sprockets — no custom work.”
Line-shaft drive retrofit on 6 flat-knitting looms, Dandenong VIC
Anthony J.
Spincraft Textile Machinery Pty Ltd — Australia
★★★★★
“We use the EPNRV030 on our screen-printing squeegee feed drives, coupled to an existing belt drive. The compact 1.2 kg housing fits between the existing machine frame members with only 3 mm clearance each side — no other reducer in this torque class fit within the space constraints.”
Squeegee feed drive on rotary screen-printing machine
Takeshi N.
Kyowa Printing Machines Co., Ltd — Japan
★★★★☆
“Good quality unit for our sauce dispensing equipment chain drives. The sealed housing handles our washdown environment well. The input shaft accepted our standard ISO 083 chain sprocket bore directly — no machining required. Would appreciate a wider bore option for larger sprockets.”
Sauce dispensing chain drive, food equipment manufacturing, Istanbul
Emre T.
Gida Makina Sanayi A.S. — Turkey
Related Products & Compatible Accessories
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EPNMRV030 — Motor-Flange Version
The EPNMRV030 is the motor-flange counterpart of the EPNRV030, sharing the same housing, worm gear, and output options but adding an IEC/NEMA VS motor flange for direct motor attachment. Choose EPNMRV030 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 EPNRV030 input shaft (9.525 mm / 0.375 in) are available from Ever-power. Verify the resultant belt or chain radial force does not exceed Fr1 = 210 N.
Flexible Couplings for Servo & Hydraulic Motors
Flexible jaw (Spider), bellows, and Oldham couplings in 9.525 mm / 0.375 in bore are available for connecting servo motors, hydraulic motors, and stepper motors to the EPNRV030 input shaft without motor-flange machining.
Output Flanges (FA / FB / FC / FD)
Multiple output flange options for the EPNRV030 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.
Shaft-Input Freedom for Retrofit & Custom Machine Builds
The EPNRV030 is the go-to solution when your drive source is not a standard IEC motor. Contact Ever-power for technical support, custom shaft configurations, or volume pricing.
