Product Overview — EP-F157 Parallel-Shaft Helical Gear Reducer
The EP-F157 is the flagship of the Ever Power parallel-shaft helical gear reducer programme, engineered for the most demanding stationary power-transmission applications in the industrial world. With a three-stage precision gear train rated at up to 20,000 N·m continuous output torque — the highest in the F-series — the EP-F157 serves rolling mill roller table drives, hydropower gate hoisting machinery, offshore deck crane main drives, and deep-mine haulage systems.
At motor powers from 1.5–90 kW and ratios spanning 5.04–97.17, the EP-F157 covers an extraordinarily wide application envelope. The three-stage helical arrangement maintains transmission efficiency above 95% at rated load — a figure that, across the working life of a major industrial installation, represents substantial savings in energy cost and cooling infrastructure. Ever Power's commitment to high efficiency is backed by factory-measured power-loss data on each unit; detailed efficiency maps across the speed-torque envelope are available on request.
The EP-F157 housing is designed for field-repairability. All bearing seats are accessible with standard tooling after removing the split-gearbox cover (when specified) or the relevant inspection access plate. Replacement bearing kits, shaft seals, and oil seal housings are stocked in our distribution centres. Learn more about our engineering standards and global supply capability on the Ever Power about page.
Technical Specifications — EP-F157
| Parameter | Specification |
|---|---|
| Gear Type | Multi-stage parallel-shaft helical gears, precision-ground DIN 6/ISO 6 |
| Number of Stages | 3-stage |
| Motor Power Range | 1.5–90 kW |
| Max Output Torque | 20,000 N·m |
| Gear Ratio Range | 5.04–97.17 |
| Output Speed Range | 15–278 rpm |
| Approximate Unit Weight | 680–960 kg |
| Max Output Radial Load | 82,000 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 — F157 Series
The F157 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 |
|---|---|
| F157 | foot-mounted, solid output shaft |
| FF157 | B5 flange-mounted, solid output shaft |
| FA157 | shaft-mounted, hollow output shaft |
| FAF157 | B5 flange + hollow output shaft |
| FAT157 | torque-arm, hollow output shaft |
| FA157-SZ | input shaft only, no motor flange |
Mounting Positions M1–M6
All F157 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-F157
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-F157 typically saves 15–35% in electrical energy over the same duty cycle — a saving that often exceeds the gearbox purchase price within two years.
With up to 20,000 N·m from a housing sized for 1.5–90 kW, the EP-F157 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.
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.
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.
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.
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 F157's small envelope also reduces the inertia of the stationary drive assembly, which matters in frequent-cycle indexing applications.
Structural Type Diagrams — F157 Series
The diagrams below show the external geometry and connection interfaces for each structural type in the F157 family. Use these to confirm mounting space requirements and driven-machine interface compatibility before finalising your order.
F157 Standard Foot-Mount (Solid Output Shaft)
FF157 Flange-Mount (Solid Output Shaft)
FA157 Shaft-Mounted (Hollow Output Bore)
FAF157 Flange + Hollow Bore
FAT157 Torque-Arm (Hollow Bore)
FA157-SZ Input Shaft Only
Industry Applications — Where the EP-F157 Excels
| Industry Sector | Typical Application |
|---|---|
| Major Steel Mills | Reheating furnace discharge roller drives and descaler pump drives in hot-rolling lines. |
| Large Hydropower | Gate hoisting machinery and penstock valve actuators for major hydroelectric projects. |
| Offshore Energy | Platform supply vessel deck crane drives and mooring capstan main drives. |
| Deep Mining | Winder auxiliary drives and shaft-sinking equipment main conveyors. |
Application Case Study: Hot-Rolling Mill Roller Drive
A hot-rolling mill modernisation project replaced six ageing herringbone gearboxes on its reheating furnace roller drives with EP-F157 units. The new units handle instantaneous torque spikes of 2.5× rated during scale-breaking, and post-installation vibration measurements are 40% lower than the original gearboxes.
Model Designation Guide — How to Order an EP-F157
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 – F157 – FAT – Y – 3 – 7.5 – 4P – M1
| Code Element | Meaning |
|---|---|
| EP | Brand identifier — Ever Power |
| F157 | 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-F157
What are the structural requirements for installing the EP-F157?
The EP-F157 weighs 680–960 kg depending on configuration. The mounting baseplate must be rated for the combined static weight and dynamic torque reaction. We recommend a reinforced concrete or fabricated steel skid designed for at least 3× the static load. Grout pockets or shim-pack areas must be flat and level to within 0.3 mm/m.
What inspection and maintenance interval is recommended for the EP-F157?
First oil change at 400 operating hours after commissioning; subsequent intervals at 10,000 hours or 24 months. Annual visual inspections of seals, breathers, and fastener torques are recommended. Major overhaul (bearing replacement, gear inspection) at 30,000–40,000 hours depending on load spectrum.
Can the EP-F157 be connected to a hydraulic motor instead of an electric motor?
Yes. The F157 input shaft accepts standard SAE flange hydraulic motors via an adaptor plate. Specify the hydraulic motor make, model, SAE flange size, and shaft spline or key dimensions. Operating speed must remain within the EP-F157 input speed range (max. 1,500 rpm for standard units).
What are the lead time and commercial terms for the EP-F157?
The EP-F157 is a large industrial gearbox requiring careful project planning. Standard lead time is 20–45 working days for most configurations; heavily customised or special-material units may require 45–90 working days. Minimum order value is USD 1,500 (single unit accepted). We support EXW, FOB, CIF, and DAP terms; DDP negotiable. Contact us via our inquiry page for formal quotation and project scheduling.
What documentation is supplied with the EP-F157?
Each EP-F157 unit ships with: (1) factory test report including oil-temperature rise and vibration levels, (2) certified dimension drawing, (3) installation and maintenance manual, (4) gear ratio and mounting position label on nameplate. ATEX IECEx certificates, material traceability records, and third-party inspection reports are available on request for critical applications.
Mission-Critical Drive Engineering at Scale
The EP-F157 powers the world's most demanding applications. Ever Power provides dedicated project management, third-party inspection support, and factory witness testing for high-value contracts. Discover our manufacturing capabilities or contact our project sales team to discuss your programme requirements.