EP-H1 Single-Stage Helical Inline Gearbox

Compact, high-efficiency single-stage speed reduction — the foundation of the HB helical gearbox family. Up to 3.6 kNm, sizes 3–19, eight shaft configurations.

Overview: Single-Stage Simplicity, Industrial Reliability

The EP-H1 is a single-stage parallel-shaft helical gear unit — the most direct-action member of the Ever Power HB industrial gearbox series. Where multi-stage units add ratio depth, the H1 optimises for three qualities that matter in space-limited or energy-sensitive installations: maximum efficiency per stage, minimum axial length, and the fewest components between motor and driven machine.

Single-stage does not mean light-duty. Built to the same manufacturing standards as every HB series unit — carburised and ground helical gears, heavy anti-friction bearings, sealed and ribbed cast iron housings — the EP-H1 delivers decades of reliable service in conveyors, agitators, fans, process pumps, and auxiliary drives across the chemical, food, packaging, and material-handling sectors.

Available across sizes 3 through 19 with a maximum output torque of 3.6 kNm at the largest frame, the EP-H1 covers a meaningful band of industrial drive requirements with a compact footprint and an efficiency rating exceeding 98% per stage.

Why Choose a Single-Stage Helical Gearbox?

A single helical mesh achieves efficiency values of 98–99% per pass — the best of any geared reduction type. Compared with two-stage units running the same reduction across two meshes, the H1 eliminates the intermediate shaft, its bearings, and the second gear pair. This reduces parasitic losses, lowers the operating temperature, and extends lubricant life.

The compact axial length matters for machine designers. Single-stage parallel-shaft geometry is the shortest in-line speed reducer achievable for a given torque class. Where a multi-stage unit would force a conveyor frame extension or a structural redesign, the H1 fits in the original space allocation.

Part-count reduction also shows up in maintenance economics. Fewer gears and fewer bearings mean fewer inspection points, simpler overhauls, and lower spare-parts inventory. For OEMs with large installed fleets, this translates into a lower total cost of ownership over the equipment lifetime.

Size Range & Nominal Output Torque

EP-H1 covers a continuous size range from 3 to 19. Each size step increases centre distance and gear width, raising the nominal torque capacity in defined increments.

EP-H1 Horizontal Dimension Drawing — Sizes 3–19

Values are nominal continuous-duty torques. Apply service factor for shock, start-stop, or reversing loads before frame selection.

Shaft & Mounting Configurations

Eight standard configurations ensure the EP-H1 integrates into virtually any machine layout without custom shaft work:

HSH: Solid Shaft Horizontal

HSV: Solid Shaft Vertical

Key Engineering Features

Industry Applications

The EP-H1's compact geometry and high efficiency make it the preferred choice wherever motor-to-machine torque matching requires a single reduction step:

Gearbox Selection Guide

Step 1 — Required Output Torque. Determine the continuous running torque at the output shaft and multiply by the applicable service factor (SF 1.0 for uniform loads; up to SF 2.5 for heavy shock or frequent reversals). The selected size's nominal torque must exceed this factored value.

Step 2 — Speed Ratio. Divide motor speed by required output speed. H1 single-stage ratios typically range from 1.25:1 to 6.3:1 depending on the size selected. For higher ratios, step up to EP-H2, EP-H3, or EP-H4.

Step 3 — Thermal Check. In high-ambient environments or enclosed installations, verify that the unit's thermal power rating — the maximum continuous power the housing can reject to the ambient air — is not exceeded. If it is, specify a cooling fan or choose a larger frame.

Step 4 — Overhung Shaft Loads. If a sprocket, pulley, or pinion is mounted on the output shaft, calculate the resulting radial overhung load and compare it against the bearing load table for that size. Excessive overhung loads reduce bearing life; use the closest practical connection point to the housing face or add outboard support bearings.

Our technical team is available for application-specific review. Send us your drive data and we will confirm the correct size, ratio, and mounting configuration within one business day.

Installation & Maintenance

Oil Fill Level. Fill to the level indicator with the unit in its installed orientation. Horizontal and vertical installations have different internal oil paths — never fill a vertically-installed H1 to the horizontal mark or the upper bearings will run dry.

First Service. Replace lubricant after the initial 300–500 operating hours to flush metallic run-in particles before they recirculate through the gear mesh. This single action significantly extends gear and bearing life.

Alignment. For solid-shaft (HSH) versions, align motor and gearbox to within the coupling's rated misalignment tolerance — typically <0.1 mm parallel and <0.1° angular. For hollow-bore (HHH/HDH) versions, the driven shaft surface should be ground to Ra ≤ 0.8 μm to ensure full shrink-fit contact area.

Periodic Inspection. At each maintenance shutdown, inspect shaft seals for weeping, check fastener torques on mounting feet and motor flanges, and verify oil level and condition (colour and viscosity). Oil analysis every 5,000 hours in demanding environments enables condition-based oil changes.

Frequently Asked Questions

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Send us your application torque, speed ratio, and mounting constraints. Our engineers will confirm the correct frame size and provide a quotation within one business day.

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