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EPNRV040 Shaft-Input Aluminium Worm Reducer — Overview
The EPNRV040 aluminium worm reducer combines the corrosion-resistant construction of the EPNMRV series with the shaft-input flexibility demanded by agricultural and grain handling equipment designers. Without an integrated motor flange, the EPNRV040 connects directly to PTO belt drives, roller chain sprockets, and existing line shafts — making it the standard choice for retrofitting speed reduction into grain auger drives, belt-driven irrigation pump assemblies, and fan speed reduction applications across Australia’s agricultural sector. Weighing 2.3 kg and delivering up to 45 Nm output torque, the EPNRV040 is a cost-effective, lightweight speed reduction solution for belt and chain drive machinery operating at input speeds from 300 to 1,400 rpm.
EPNRV040 Technical Specifications
General Specifications
| Parameter | Value |
|---|---|
| Model | EPNRV040 |
| Maximum Output Torque (M2) | 45 Nm |
| Maximum Output Radial Force (Fr2) | 3118 N |
| Maximum Input Shaft Radial Force (Fr1) | 350 N |
| Available Gear Ratios (i) | 5, 7.5, 10, 15, 20, 25, 30, 40, 50, 60, 80, 100 |
| Output Shaft Diameter | 18 mm / 0.750 in |
| Input Shaft Diameter | 12.7 mm / 0.500 in |
| Input Type | Open shaft — no motor flange |
| Compatible Input Sources | V-belt pulley, chain sprocket, flexible coupling, line shaft |
| Unit Weight | 2.3 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 | 3.07 in | 78 mm |
| B – Body height | 2.81 in | 71 mm |
| J – Overall length | 3.98 in | 101 mm |
| Output shaft dia. | 0.750 in | 19 mm |
| Input shaft dia. | 0.500 in | 12.7 mm |
| Max input shaft radial load (Fr1) | – | 350 N |
| Max output shaft radial load (Fr2) | – | 3,118 N |
| Weight | – | 2.3 kg |
Performance Data — EPNRV040 (n1 = 1,400 rpm)
| Ratio (i) | n2 (rpm) | P1 (kW) | M2 (Nm) | Fr2 (N) | Fr1 (N) |
|---|---|---|---|---|---|
| 5 | 280 | 1.1 | 34 | 1149 | 250 |
| 7.5 | 186.7 | 0.9 | 40 | 1315 | 294 |
| 10 | 140 | 0.7 | 40 | 1447 | 331 |
| 15 | 93.3 | 0.5 | 40 | 1657 | 331 |
| 20 | 70 | 0.4 | 39 | 1824 | 350 |
| 25 | 56 | 0.3 | 38 | 1964 | 350 |
| 30 | 46.7 | 0.3 | 45 | 2087 | 350 |
| 40 | 35 | 0.2 | 41 | 2298 | 350 |
| 50 | 28 | 0.2 | 39 | 2475 | 350 |
| 60 | 23.3 | 0.2 | 36 | 2630 | 350 |
| 80 | 17.5 | 0.1 | 33 | 2895 | 350 |
| 100 | 14 | 0.1 | 29 | 3118 | 350 |
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 EPNRV040 and the EPNMRV040 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 EPNMRV040 has an integrated IEC/NEMA motor flange (VS) that attaches directly to a standard electric motor; the EPNRV040 instead has an open input shaft with keyway, accepting V-belt pulleys, chain sprockets, flexible couplings, or any other mechanical drive arrangement. Choose EPNMRV040 when driving from a standard IEC or NEMA motor; choose EPNRV040 when your input source is a belt drive, chain drive, hydraulic motor, servo drive with non-standard frame, or existing line shaft.
| Feature | EPNRV040 | EPNMRV040 |
|---|---|---|
| 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 350 N | N/A — load in motor bearing |
| Weight | 2.3 kg | 2.3 kg (identical) |
| Output shaft/flanges | Identical to EPNMRV040 | Identical to EPNRV040 |
Key Features & Benefits — EPNRV040
PTO & Belt-Drive Ready for Agriculture
The 12.7 mm (0.500 in) input shaft with keyway accepts standard V-belt pulleys and agricultural roller chain sprockets directly. With Fr1 rated at 350 N, the EPNRV040 handles multi-groove V-belt drives from tractor PTO gearboxes and stationary engine belt drives without input shaft bearing overload.
Line-Shaft Drive for Multi-Station Systems
Industrial facilities using line-shaft power distribution can drive multiple EPNRV040 units from a single overhead shaft via individual belt or chain drops — a classic factory layout that the shaft-input design makes easy to implement without complex motor mounting structures at each station.
45 Nm — Handles Agricultural Start-Up Loads
At 30:1 ratio the EPNRV040 delivers 45 Nm — sufficient for cold-start auger drives, partially loaded conveyor chains, and stiff irrigation gate actuators that present elevated breakaway torques before reaching steady-state running.
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Weather-Resistant for Outdoor Farm Use
Two-coat baked epoxy finish, multi-lip shaft seals, and a sealed housing joint protect the EPNRV040 against the dust, fertiliser spray, and moisture cycling of outdoor agricultural installation — matching the corrosion performance of the flange-input EPNMRV040.
Four Output Flange Options
FA, FB, FC, and FD output flanges allow the EPNRV040’s output to connect directly to conveyor sprocket hubs, auger coupling flanges, and fan shaft brackets without custom adaptors — a flexibility level that no competitor’s shaft-input reducer at this size offers as standard.
Application Scenarios — Where the EPNRV040 Excels
Agricultural Belt-Drive & PTO Systems
Grain auger drives, irrigation pump belt-drive assemblies, and seed conveyor drives across Australian broad-acre farms use the EPNRV040 connected via V-belt to engine or electric motor pulleys. The 350 N Fr1 rating handles the belt tensions of a standard 3-groove B-section V-belt drive without input shaft bearing damage. Keyword: shaft-input worm gearbox for agricultural belt-drive and PTO systems
Industrial Conveyor Line-Shaft Drives
Factories with overhead line-shaft power distribution use multiple EPNRV040 units to reduce line-shaft speed to individual conveyor belt drives. Chain drop from the overhead shaft connects directly to the EPNRV040 input sprocket, and the output flange drives the conveyor roller via a second chain stage. Keyword: shaft-input worm reducer for industrial conveyor line-shaft systems
️ Fan Speed Reduction & Cooling Systems
Industrial cooling fan drives, ventilation damper actuators, and process air-handling units use the EPNRV040 to step down motor speed to the fan’s operating range via V-belt input. The sealed housing resists the airborne dust and moisture typical in industrial ventilation environments. Keyword: shaft-input worm gear reducer for industrial fan speed reduction
⚙️ Upgrade & Retrofit Machine Modernisation
When replacing worn or obsolete speed reducers in ageing machinery, the EPNRV040’s shaft input allows direct coupling to the existing drive pulley or sprocket without altering the motor mounting. Machine downtime is minimised to the time needed for shaft coupling replacement only. Keyword: aluminium worm reducer for machine retrofit and drive modernisation
Selection Guide & Mounting Reference — EPNRV040
Model Selection Recommendation
Select the EPNRV040 when output torque is 29–45 Nm, the input is a belt/chain/coupling shaft, and Fr1 ≤ 350 N. For standard IEC/NEMA motor input, use the EPNMRV040 instead. Step up to EPNRV050 if torque exceeds 45 Nm.
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 |
EPNRV040 vs EPNMRV040 — Head-to-Head Comparison
| Attribute | EPNRV040 | EPNMRV040 | Notes |
|---|---|---|---|
| Motor flange | None — shaft input | Integrated IEC/NEMA flange | Accepts belt/chain/coupling drive |
| Fr1 (input radial) | Up to 350 N | N/A | Supports V-belt and chain input |
| Retrofit ease | High — uses existing sprockets | Needs motor bracket change | Faster, lower-cost installation |
| Drive source | Belt, chain, coupling, line shaft | Standard IEC/NEMA motor | Broadest input source options |
| Output torque | Up to 45 Nm | Up to 53 Nm | Slightly less, same housing |
Frequently Asked Questions — EPNRV040
What is the maximum input shaft radial force (Fr1) for the EPNRV040?
The EPNRV040 input shaft is rated for a maximum radial force (Fr1) of 350 N. This covers a standard 3-groove B-section V-belt drive with normal pre-tension. For heavier belt drives with higher tension, either use a larger pulley to reduce unit belt force, or step up to the EPNRV050 which has a higher Fr1 rating of 490 N.
How do I mount a chain sprocket on the EPNRV040 input?
The 12.7 mm (0.500 in) input shaft has a 4 mm keyway. Mount a standard ISO 083 or ISO 10B roller chain sprocket with matching bore and keyway. Use the included shaft retaining screw (UR thread) to secure the sprocket axially. Confirm the resultant chain pull force does not exceed Fr1 = 350 N at the shaft end.
Can the EPNRV040 replace an EPNMRV040 in an existing installation?
Yes, dimensionally. The EPNRV040 and EPNMRV040 share the same housing, output shaft, flange options, and mounting bolt pattern. The only difference is the input end — replace the existing motor with a belt/chain drive arrangement or use a flexible coupling to a motor with a non-standard frame.
What is the maximum input speed for the EPNRV040?
The EPNRV040 is rated at n1 = 1,400 rpm reference speed. It can operate at input speeds up to 2,800 rpm with a 25% power derating, but thermal loading must be checked for speeds above 1,500 rpm in continuous duty.
Is the EPNRV040 suitable for outdoor agricultural installation?
Yes. The baked-epoxy finish, multi-lip shaft seals, and sealed housing joint provide IP54 protection as standard — appropriate for permanent outdoor installation on grain auger drives and irrigation equipment. For direct water spray (sprinkler irrigation heads), specify the IP65 variant.
What output flange options are available?
FA, FB, FC, and FD output flanges are available in addition to the standard solid output shaft and hollow bore variants. These allow direct face-mounting to conveyor sprocket hubs, fan shaft flanges, and auger coupling plates without intermediate adaptors.
Can multiple EPNRV040 units be driven from a single line shaft?
Yes — this is a primary application for the NRV series. Space each EPNRV040 along the line shaft and use individual chain or belt drops to each unit’s input sprocket/pulley. Ensure the cumulative Fr1 loads on the line shaft do not exceed the line shaft’s bearing capacity, and use adequately rated line shaft bearings between each reducer tap-off point.
Customer Reviews — EPNRV040
★★★★★
“Used the EPNRV040 on our grain auger belt drives at three sites. The V-belt from the electric motor drives the EPNRV040 input shaft directly, and the output shaft drives the auger via chain. Simple, reliable, and the sealed housing has handled two years of dusty grain shed environments without issue.”
Grain auger belt-drive reduction, three sites in Riverina NSW
Dale H.
Riverina Grain Services Pty Ltd — Australia
★★★★★
“We use the EPNRV040 on our line shaft distribution system in our legacy machine shop. Each unit is chain-driven from the overhead line shaft and drives a different machine station. After 3 years of three-shift operation, every unit is still running without a single bearing failure.”
Line-shaft driven machine station drives, Poznan factory
Stanislaw W.
Polmasz Sp. z o.o. — Poland
★★★★☆
“The EPNRV040 works well on our irrigation pump belt-drive assemblies in Gujarat. The 350 N Fr1 rating handles our 3-groove V-belt drives without the input bearing failures we experienced with a competing brand. Delivery time was faster than expected.”
Irrigation pump belt-drive assemblies, Gujarat state
Arjun M.
Agri-Drive Systems Pvt Ltd — India
Related Products & Compatible Accessories
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EPNMRV040 — Motor-Flange Version
The EPNMRV040 is the motor-flange counterpart of the EPNRV040, sharing the same housing, worm gear, and output options but adding an IEC/NEMA VS motor flange for direct motor attachment. Choose EPNMRV040 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 EPNRV040 input shaft (12.7 mm / 0.500 in) are available from Ever-power. Verify the resultant belt or chain radial force does not exceed Fr1 = 350 N.
Flexible Couplings for Servo & Hydraulic Motors
Flexible jaw (Spider), bellows, and Oldham couplings in 12.7 mm / 0.500 in bore are available for connecting servo motors, hydraulic motors, and stepper motors to the EPNRV040 input shaft without motor-flange machining.
Output Flanges (FA / FB / FC / FD)
Multiple output flange options for the EPNRV040 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.
Belt-Drive & Chain-Drive Speed Reduction — No Motor Flange Required
The EPNRV040 connects to your existing belt, chain, or line-shaft drive without a motor bracket. Contact Ever-power for shaft configuration options, Fr1 calculation support, or volume pricing.
