Audible noise is evidence to investigate, but fault location depends on whether the sound tracks speed, torque or the machine structure.
Helical Gearbox Noise Diagnosis by Speed and Load
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EP-F57 Parallel-Shaft Helical Gear Reducer
The EP-F57 is a 2-stage parallel-shaft helical gear reducer delivering up to 640 N·m output torque from 0.12–7.5 kW across gear ratios 3.77–59.14. Available in foot-mount (F), flange-mount (FF), hollow-bore (FA), flange+hollow (FAF), and torque-arm (FAT) configurations — engineered for quiet, efficient, long-service industrial drive applications.
MOQ: flexible. Minimum order value USD 1,500; mixed orders and trial quantities welcome.
Product Overview — EP-F57 Parallel-Shaft Helical Gear Reducer
At the heart of high-throughput logistics and sorting installations, the EP-F57 parallel-shaft helical gear reducer provides the speed stability and mechanical durability that automated material-handling demands. The two-stage helical gear set handles power from 0.12–7.5 kW, delivering up to 640 N·m across ratios of 3.77–59.14 — precise enough for synchronised belt and roller systems, yet robust enough for 24/7 parcel-hub operation.
The parallel output shaft configuration brings a unique layout advantage in conveyor-heavy applications: the gearbox can be positioned directly beneath the drive belt without raising the belt centreline, a constraint that right-angle configurations often fail. In cross-belt sorter and boom sorter designs, this leads to a measurably lower centre of mass and better structural dynamics. Ever Power has supplied EP-F57 units to logistics integrators across five continents, and our applications engineering team is experienced in conveyor-specific selection and sizing.
Precision-ground gears and preloaded output bearings suppress the torsional oscillations that trigger scanning errors in barcode-reader gates. The EP-F57's output speed stability is typically within ±0.5% under full load — far tighter than the dimensional tolerances of most downstream conveyor components.
Technical Specifications — EP-F57
| Parameter | Specification |
|---|---|
| Gear Type | Multi-stage parallel-shaft helical gears, precision-ground DIN 6/ISO 6 |
| Number of Stages | 2-stage |
| Motor Power Range | 0.12–7.5 kW |
| Max Output Torque | 640 N·m |
| Gear Ratio Range | 3.77–59.14 |
| Output Speed Range | 25–370 rpm |
| Approximate Unit Weight | 16–25 kg |
| Max Output Radial Load | 6,200 N |
| Transmission Efficiency | ≥ 96% per stage (overall ≥ 92% for 2-stage, ≥ 88% for 3-stage) |
| Lubrication | Splash lubrication; ISO VG 220 mineral oil (factory fill) |
| Housing Material | Close-grained cast iron (HT250 / EN-GJL-250) |
| Gear Material | Case-hardened alloy steel (20CrMnTi / 20MnCr5), HRC 58–62 |
| Protection Rating | IP55 standard; IP65 optional |
| Ambient Temperature | −25 °C to +45 °C (standard lubricant) |
| Noise Level | ≤ 72 dB(A) at rated load (1 m, free-field) |
| Standards Compliance | ISO 6336, DIN 3990 gear rating; ISO 281 bearing life; CE Machinery Directive |
Structural Types & Mounting Configurations — F57 Series
The F57 series is available in multiple structural types to suit different installation geometries and driven-machine interfaces. All types share the same internal gear set and achieve identical torque and efficiency ratings; the differences lie in mounting method and output connection.
| Type Code | Description |
|---|---|
| F57 | foot-mounted, solid output shaft |
| FF57 | B5 flange-mounted, solid output shaft |
| FA57 | shaft-mounted, hollow output shaft |
| FAF57 | B5 flange + hollow output shaft |
| FAT57 | torque-arm, hollow output shaft |
Mounting Positions M1–M6
All F57 structural types support six standard mounting positions (M1 through M6), defined by the angular orientation of the output shaft relative to the horizontal. Oil fill level and vent plug position must be adjusted for each mounting position; refer to the installation manual for position-specific fill quantities and the correct vent-plug orientation.
Key Advantages of the EP-F57
High Transmission Efficiency
Each gear stage delivers ≥96% mechanical efficiency through precision-ground helical flanks and optimised tooth profile corrections. Compared with worm reducers of equivalent output torque, the EP-F57 typically saves 15–35% in electrical energy over the same duty cycle — a saving that often exceeds the gearbox purchase price within two years.
High Torque Density
With up to 640 N·m from a housing sized for 0.12–7.5 kW, the EP-F57 achieves torque density competitive with bevel-helical units of the same output-shaft diameter. The case-hardened alloy-steel gears (HRC 58–62) sustain high Hertzian contact stress without case fatigue, enabling compact dimensions even at the upper end of the power range.
Long, Predictable Service Life
Bearings are selected for a minimum L10h life of 20,000 hours at rated conditions and verified by ISO 281 calculation using actual application load spectra. Precision-ground gears eliminate the geometric errors that cause micro-pitting, extending tooth-flank life to typically 40,000 hours or more when correctly lubricated.
Multiple Structural Types
Five standard structural types — F, FF, FA, FAF, FAT — and an input-shaft-only FA-SZ variant address virtually every machine interface geometry without custom engineering. The FA and FAT hollow-bore types eliminate external couplings entirely, reducing drivetrain length and eliminating one routine maintenance item.
Low Noise & Low Vibration
Helical gear engagement produces a progressive, distributed contact zone rather than the sudden full-face mesh of spur gears. This characteristic, combined with profile-ground tooth flanks and dynamically balanced rotating components, keeps noise levels below 72 dB(A) at 1 m — important in operator-occupied environments and buildings with vibration-sensitive equipment.
Compact Inline Layout
The parallel-shaft geometry keeps the overall drive envelope short in the radial direction, allowing direct-couple installation in machine frames where right-angle units would require a longer cantilevered arrangement. The F57's small envelope also reduces the inertia of the stationary drive assembly, which matters in frequent-cycle indexing applications.
Structural Type Diagrams — F57 Series
The diagrams below show the external geometry and connection interfaces for each structural type in the F57 family. Use these to confirm mounting space requirements and driven-machine interface compatibility before finalising your order.
F57 Standard Foot-Mount (Solid Output Shaft)
FF57 Flange-Mount (Solid Output Shaft)
FA57 Shaft-Mounted (Hollow Output Bore)
FAF57 Flange + Hollow Bore
FAT57 Torque-Arm (Hollow Bore)
FA57-SZ Input Shaft Only
Industry Applications — Where the EP-F57 Excels
| Industry Sector | Typical Application |
|---|---|
| Logistics & Sortation | Diverters, merge units, and high-speed scanners on parcel-sorting systems in courier hubs. |
| Dairy & Beverage | Pasteuriser belt drives and CIP-compatible wash-down applications needing stainless-compatible housings. |
| Automotive Assembly | Roller conveyor drives on body-shop skid systems and press-room transfers. |
| Bakery Production | Dough sheeter rolls and oven-infeed conveyors with continuous-duty, humidity-resistant design. |
Application Case Study: Parcel Sorting Hub
A major logistics company installed EP-F57 units on 48 diverter arms in a new parcel sorting hub. The in-line parallel-shaft design allowed belt heights 60 mm lower than the previous right-angle units, simplifying maintenance access and reducing the structural steel cost by approximately 8%.
Model Designation Guide — How to Order an EP-F57
The model code contains all ordering information required for production. An example order code for a torque-arm, hollow-bore, 7.5 kW unit is:
EP - F57 - FAT - Y - 3 - 7.5 - 4P - M1
| Code Element | Meaning |
|---|---|
| EP | Brand identifier — Ever Power |
| F57 | Series and frame size |
| FAT | Structural type: torque-arm, hollow-bore output |
| Y | Motor type: Y-series IEC standard induction motor |
| 3 | Number of gear stages |
| 7.5 | Motor rated power in kW |
| 4P | Motor pole count (1,450 rpm at 50 Hz) |
| M1 | Mounting position |
Frequently Asked Questions — EP-F57
Accelerate Your Logistics Infrastructure with EP-F57
Explore the full range of EP parallel-shaft helical gear reducers, from compact F37 to heavy-duty F157, on our homepage. Our team offers DDP delivery, on-site commissioning consultation, and flexible payment terms for qualified logistics integrators and OEM partners.
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