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-F107 Parallel-Shaft Helical Gear Reducer
The EP-F107 is a 3-stage parallel-shaft helical gear reducer delivering up to 7,500 N·m output torque from 0.75–37 kW across gear ratios 5.04–97.17. 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-F107 Parallel-Shaft Helical Gear Reducer
The EP-F107 parallel-shaft helical gear reducer represents the medium-heavy tier of the F-series, bridging the gap between mid-range industrial drives and truly heavy equipment. Rated at up to 7,500 N·m continuous output torque from motor powers of 0.75–37 kW, the three-stage helical gear train spans ratios of 5.04–97.17 — sufficient to serve sintering belt head-drives, cement raw-mill auxiliaries, and power-plant coal-handling systems.
Thermal management is central to the EP-F107 design philosophy. The cast-iron housing geometry is computed to maximise surface area per unit volume, and the standard external paint scheme uses a heat-dissipating formulation that lowers steady-state oil temperature by approximately 3–5 °C compared with a conventional enamel finish. At heavy load, this margin meaningfully extends the lubricant change interval and delays degradation of bearing grease.
FAT107 torque-arm variants are regularly used on long-distance overland conveyors to accommodate thermal expansion of the conveyor structure without transmitting bending moments to the driven shaft. Visit the Ever Power product catalogue for full dimensional drawings and selection tables.
Technical Specifications — EP-F107
| Parameter | Specification |
|---|---|
| Gear Type | Multi-stage parallel-shaft helical gears, precision-ground DIN 6/ISO 6 |
| Number of Stages | 3-stage |
| Motor Power Range | 0.75–37 kW |
| Max Output Torque | 7,500 N·m |
| Gear Ratio Range | 5.04–97.17 |
| Output Speed Range | 15–278 rpm |
| Approximate Unit Weight | 200–285 kg |
| Max Output Radial Load | 38,500 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 — F107 Series
The F107 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 |
|---|---|
| F107 | foot-mounted, solid output shaft |
| FF107 | B5 flange-mounted, solid output shaft |
| FA107 | shaft-mounted, hollow output shaft |
| FAF107 | B5 flange + hollow output shaft |
| FAT107 | torque-arm, hollow output shaft |
| FA107-SZ | input shaft only, no motor flange |
Mounting Positions M1–M6
All F107 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-F107
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-F107 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 7,500 N·m from a housing sized for 0.75–37 kW, the EP-F107 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 F107's small envelope also reduces the inertia of the stationary drive assembly, which matters in frequent-cycle indexing applications.
Structural Type Diagrams — F107 Series
The diagrams below show the external geometry and connection interfaces for each structural type in the F107 family. Use these to confirm mounting space requirements and driven-machine interface compatibility before finalising your order.
F107 Standard Foot-Mount (Solid Output Shaft)
FF107 Flange-Mount (Solid Output Shaft)
FA107 Shaft-Mounted (Hollow Output Bore)
FAF107 Flange + Hollow Bore
FAT107 Torque-Arm (Hollow Bore)
FA107-SZ Input Shaft Only
Industry Applications — Where the EP-F107 Excels
| Industry Sector | Typical Application |
|---|---|
| Iron Ore Processing | Large-tonnage belt conveyor tail and head drives in iron ore sintering plants. |
| Cement Plants | Raw mill separator auxiliary drives and preheater fan gearboxes. |
| Fertiliser Production | Granulator drum drives and urea prilling tower scraper drives. |
| Power Plants | Coal crusher drives and induced-draft fan control gearboxes. |
Application Case Study: Iron Ore Sintering Belt
An integrated iron and steel complex installed EP-F107 units on the head and tail drives of its 1.8 km sintering belt. After three years of operation carrying sinter at 280 °C ambient, the housings show no thermal distortion and all bearing clearances remain within factory specification.
Model Designation Guide — How to Order an EP-F107
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 - F107 - FAT - Y - 3 - 7.5 - 4P - M1
| Code Element | Meaning |
|---|---|
| EP | Brand identifier — Ever Power |
| F107 | 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-F107
Reliable Supply for Large-Scale Industrial Projects
Large plant operators trust Ever Power for consistent quality, documented traceability, and reliable global logistics. The EP-F107 is available with full material certificates, third-party inspection, and project-specific tagging. Submit your project specification for a formal proposal.
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