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-F37 Parallel-Shaft Helical Gear Reducer
The EP-F37 is a 2-stage parallel-shaft helical gear reducer delivering up to 200 N·m output torque from 0.12–3.0 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-F37 Parallel-Shaft Helical Gear Reducer
The EP-F37 is a compact parallel-shaft helical gear reducer engineered for applications where space is limited but performance cannot be compromised. With a two-stage gear train delivering up to 200 N·m output torque and power ratings from 0.12–3.0 kW across gear ratios of 3.77–59.14, the EP-F37 brings industrial-grade reliability to small machinery without the dimensional burden of traditional right-angle designs.
Precision-ground helical gear teeth engage progressively rather than all at once, distributing load across multiple tooth pairs simultaneously. This contact geometry reduces gear-mesh excitation forces, so the EP-F37 operates noticeably more quietly than spur or worm alternatives of equivalent torque capacity. The result is a drive unit that suits noise-sensitive settings — laboratories, cleanrooms, and light manufacturing halls — without acoustic treatment.
All internal components are housed in a rigid, close-grained cast-iron casing machined on a single reference datum. This dimensional discipline maintains bearing-bore concentricity and gear-flank parallelism over the full working life, preserving the efficiency advantage of helical gearing — typically 96–97% per stage — even after years of continuous operation. Learn more about our engineering philosophy on the Ever Power about page.
Technical Specifications — EP-F37
| Parameter | Specification |
|---|---|
| Gear Type | Multi-stage parallel-shaft helical gears, precision-ground DIN 6/ISO 6 |
| Number of Stages | 2-stage |
| Motor Power Range | 0.12–3.0 kW |
| Max Output Torque | 200 N·m |
| Gear Ratio Range | 3.77–59.14 |
| Output Speed Range | 25–370 rpm |
| Approximate Unit Weight | 7–11 kg |
| Max Output Radial Load | 3,200 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 — F37 Series
The F37 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 |
|---|---|
| F37 | foot-mounted, solid output shaft |
| FF37 | B5 flange-mounted, solid output shaft |
| FA37 | shaft-mounted, hollow output shaft |
| FAF37 | B5 flange + hollow output shaft |
| FAT37 | torque-arm, hollow output shaft |
Mounting Positions M1–M6
All F37 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-F37
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-F37 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 200 N·m from a housing sized for 0.12–3.0 kW, the EP-F37 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 F37's small envelope also reduces the inertia of the stationary drive assembly, which matters in frequent-cycle indexing applications.
Structural Type Diagrams — F37 Series
The diagrams below show the external geometry and connection interfaces for each structural type in the F37 family. Use these to confirm mounting space requirements and driven-machine interface compatibility before finalising your order.
F37 Standard Foot-Mount (Solid Output Shaft)
FF37 Flange-Mount (Solid Output Shaft)
FA37 Shaft-Mounted (Hollow Output Bore)
FAF37 Flange + Hollow Bore
FAT37 Torque-Arm (Hollow Bore)
FA37-SZ Input Shaft Only
Industry Applications — Where the EP-F37 Excels
| Industry Sector | Typical Application |
|---|---|
| Textile Machinery | Yarn winding reels, warp beam drives, and fabric compacting machines needing ultra-compact in-line drives with stable low-speed output. |
| Light Conveyor Systems | Flat-belt and slat conveyors in electronics assembly where a small footprint and quiet operation are critical. |
| Laboratory Equipment | Sample processing robots and stirring reactors requiring repeatable, low-vibration drive. |
| Printing Industry | Ink pump drives and paper-path tension rollers in offset printing machines. |
Application Case Study: Textile Yarn Winder
A high-speed yarn winder in a polyester fibre plant required stable 38 rpm output to maintain even yarn tension. An EP-F37 with a 0.25 kW motor and 39:1 ratio achieved noise levels below 58 dB(A) during triple-shift operation, cutting thread break rates by 25% and simplifying a previously awkward worm-gear installation.
Model Designation Guide — How to Order an EP-F37
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 - F37 - FAT - Y - 3 - 7.5 - 4P - M1
| Code Element | Meaning |
|---|---|
| EP | Brand identifier — Ever Power |
| F37 | 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-F37
Partner with Ever Power for Compact, Efficient Drive Solutions
Whether you are specifying a single EP-F37 for a prototype or planning a full production run, our applications engineering team is ready to support your selection, integration, and after-sales requirements. Learn about Ever Power and discover why engineers in more than 30 countries trust us for precision helical gear drives.
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