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-S67 Helical-Worm Gear Reducer
The EP-S67 is a 2 (1 helical + 1 worm) helical-worm gear reducer with right-angle output, delivering up to 800 N·m from 0.12–5.5 kW across gear ratios 8.74–196.11. Available in foot-mount (S), flange-mount (SF), hollow-bore (SA), flange+hollow (SAF), and torque-arm (SAT) configurations — quieter and more efficient than conventional worm reducers.
MOQ: flexible. Minimum order value USD 1,500; mixed orders and trial quantities welcome.
Product Overview — EP-S67 Helical-Worm Gear Reducer
At the heart of modern logistics and automated warehousing lies a requirement for drives that are compact, quiet, and essentially maintenance-free across the operating life of the installation. The EP-S67 helical-worm gear reducer meets this specification with up to 800 N·m output torque from 0.12–5.5 kW across ratios of 8.74–196.11 — a combination that suits everything from horizontal shuttle travel axes to spiral conveyor head drives and goods-lift mechanisms.
The right-angle layout of the S-series is indispensable in many logistics geometries: a parallel-shaft drive would require an additional 90° bevel or chain stage to achieve the same layout, adding cost, length, and maintenance requirements. The EP-S67's compact right-angle housing fits directly beneath conveyor belt surfaces or within shuttle vehicle frames, keeping the total drive package height within the structural constraints of dense rack storage systems.
Five structural types (S, SF, SA, SAF, SAT) ensure that mounting to virtually any machine interface is straightforward without custom adaptor plates. The Ever Power engineering team is experienced in logistics-system drive selection and can provide layout drawings and 3D models to support your machine design.
Technical Specifications — EP-S67
| Parameter | Specification |
|---|---|
| Gear Type | Helical pre-stage + worm gear set (right-angle output) |
| Number of Stages | 2 (1 helical + 1 worm) |
| Motor Power Range | 0.12–5.5 kW |
| Max Output Torque | 800 N·m |
| Gear Ratio Range | 8.74–196.11 |
| Output Speed Range | 7–161 rpm |
| Approximate Unit Weight | 22–35 kg |
| Max Output Radial Load | 8,000 N |
| Overall Efficiency | 75–82% (vs 55–65% for equivalent single-stage worm) |
| Lubrication | Oil bath; ISO VG 220 synthetic-blend worm gear oil (factory fill) |
| Housing Material | Close-grained cast iron (HT250) |
| Worm Shaft Material | 20CrMnTi alloy steel, case-hardened HRC 58–62, profile ground Ra ≤ 0.4 µm |
| Worm Wheel Material | Centrifugally cast phosphor-bronze (ZCuSn10P1) |
| Helical Stage Material | 20CrMnTi alloy steel, case-hardened, precision ground DIN 6 |
| Protection Rating | IP55 standard; IP65 optional |
| Ambient Temperature | −25 °C to +40 °C (standard lubricant) |
| Noise Level | ≤ 68 dB(A) at rated load (1 m, free-field) |
| Standards Compliance | ISO 14521 worm gear rating; ISO 281 bearing life; CE Machinery Directive |
Structural Types & Mounting Configurations — S67 Series
The S67 series is produced in five structural types plus an input-shaft-only SA-SZ variant. All share the same internal helical-worm gear train and achieve identical output torque and efficiency ratings. The structural type determines the mounting method and driven-machine interface.
| Type Code | Description |
|---|---|
| S67 | foot-mounted, solid output shaft |
| SF67 | B5 flange-mounted, solid output shaft |
| SA67 | shaft-mounted, hollow output bore |
| SAF67 | B5 flange + hollow output bore |
| SAT67 | torque-arm, hollow output bore |
SF and SAF Mounting Positions
Flange-mounted SF67 and SAF67 variants support all six standard mounting positions. Oil fill level and breather plug position must be adjusted per mounting position — refer to the position-specific lubrication table in the installation manual.
SA and SAT Torque-Arm Mounting Positions
The SA67 shaft-mounted and SAT67 torque-arm variants mount directly onto the driven shaft, reacting torque through the torque arm rather than a baseplate. This eliminates shaft-to-shaft coupling alignment and is particularly suited to conveyor head drives and drum agitators.
Key Advantages of the EP-S67 Helical-Worm Reducer
Superior Efficiency vs. Worm-Only Drives
The helical input stage of the EP-S67 achieves ≥98% per-stage efficiency, contributing directly to the 75–82% overall efficiency of the complete unit — 15–25 percentage points above conventional single-stage worm reducers. In continuous-duty applications this margin translates to measurable energy cost reduction and lower operating heat, reducing cooling requirements and extending lubricant life.
Right-Angle Compact Form Factor
The S-series right-angle configuration delivers 800 N·m from a housing sized for 0.12–5.5 kW — a torque density comparable to much larger parallel-shaft units. The perpendicular input-to-output layout is inherently suited to machine geometries where the motor and driven shaft cannot share the same axis, eliminating additional bevel stages or chain-and-sprocket drives that add cost and maintenance.
Significantly Quieter Operation
By pre-reducing speed in the helical stage before it reaches the worm mesh, the EP-S67 reduces worm sliding velocity at any given overall ratio. Lower sliding velocity directly reduces worm-mesh friction noise, yielding typical noise levels 6–10 dB(A) below equivalent single-stage worm reducers — an advantage valued in food production halls, pharmaceutical facilities, and any environment with operator occupancy near the drive.
Wide High-Reduction Ratio Range
Ratios from 8.74 to 196.11 in a single housing are achievable with the EP-S67, covering applications from moderately fast conveyor drives at the lower end to very slow-rotation stirring and positioning drives at the upper end. This breadth eliminates the need to cascade multiple reducers in most applications, simplifying the drivetrain and reducing total installation length.
Multiple Structural Types
Five structural types — S, SF, SA, SAF, SAT — plus the SA-SZ input shaft variant address every practical machine interface without custom engineering. SA and SAF hollow-bore types allow direct shaft mounting, eliminating flexible couplings and their associated alignment requirements. The SAT torque-arm type simplifies drum and conveyor installations further by reacting torque through a single rubber-buffered arm rather than a rigid baseplate.
Long-Life Worm Gear Materials
The EP-S67 worm wheel is manufactured from centrifugally cast phosphor-bronze (ZCuSn10P1), chosen for its combination of high load capacity, low friction against hardened steel, and resistance to adhesive wear under boundary-lubrication conditions during start-up. The hardened and profile-ground worm shaft (Ra ≤ 0.4 µm) maintains an elastohydrodynamic oil film across the full operating speed range, extending tooth-surface life to typically 25,000–40,000 hours.
Structural Type Diagrams — S67 Series
Use the diagrams below to confirm the external geometry, mounting interface, and connection dimensions of each S67 structural type before finalising your machine design. Certified dimensional drawings in DXF and PDF are available on request.
S67 Foot-Mount, Solid Output Shaft
SF67 B5 Flange, Solid Output Shaft
SA67 Shaft-Mounted, Hollow Bore
SAF67 B5 Flange + Hollow Bore
SAT67 Torque-Arm, Hollow Bore
SA67-SZ Input Shaft Only
Industry Applications — Where the EP-S67 Excels
| Industry Sector | Typical Application |
|---|---|
| Logistics & Warehousing | Goods-to-person shuttle conveyor lifts, spiral conveyor drives, and automated storage rack horizontal shuttles. |
| Beverage Industry | Barrel-filling carousel drives, keg washer rotation units, and crate palletiser travel axis drives. |
| Chemical Processing | Low-pressure agitator drives on blending vessels and drum-tumbler drives for batch mixing. |
| Amusement & Attraction | Ride mechanism slow-rotation drives, museum turntable pedestals, and stage-set rotation rigs. |
Application Case Study: Automated Storage Shuttle
An e-commerce fulfilment centre installed EP-S67 SAF units on the horizontal travel axis of 32 shuttle carriers in a 6-level AS/RS rack. The hollow-bore mounting eliminated separate couplings and reduced vehicle assembly time by 18 minutes per unit. After 26 months of continuous 24/7 operation the first oil-change inspection showed gear wear within acceptable factory limits.
Model Designation Guide — How to Order an EP-S67
Every element of the S-series order code defines a specific product attribute. The example below shows a 1.5 kW, torque-arm, hollow-bore unit in mounting position M1:
EP - S67 - SAT - Y - 2 - 1.5 - 4P - M1
| Code Element | Meaning |
|---|---|
| EP | Brand identifier — Ever Power |
| S67 | Series and frame size — S-series helical-worm |
| SAT | Structural type: torque-arm, hollow-bore output |
| Y | Motor type: Y-series IEC standard induction motor |
| 2 | Number of gear stages (helical + worm) |
| 1.5 | Motor rated power in kW |
| 4P | Motor pole count (1,450 rpm at 50 Hz) |
| M1 | Mounting position (1 of 6 standard positions) |
Frequently Asked Questions — EP-S67
Ever Power S67 — Trusted Across the Logistics Sector
From automated storage racks to parcel sorters and spiral conveyors, the EP-S67 is a proven choice for logistics integrators worldwide. Our supply programme offers consignment stock, application support, and DDP delivery to reduce your procurement overhead. Explore the full product range at the Ever Power homepage or contact us for a framework agreement proposal.
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