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
read more
EP-R27 Inline Helical Gearmotor – Compact Speed Reducer
The EP-R27 inline helical gearmotor bridges light and medium-duty drives with up to 120 Nm output torque, gear ratios i=3.83–99, and a compact 9 kg housing. M1–M6 mounting, IP55 sealed. MOQ: 1–5 sample units; mixed orders from ~USD 1,500; lead time 10–25 working days.
EP-R27 Inline Helical Gear Reducer – Compact Speed Reducer
The EP-R27 inline helical gear reducer occupies the second step in Ever Power's R-series range, offering a moderate size upgrade over the EP-R17 while remaining one of the most compact inline helical drives available for low-power industrial automation. Frame size 27 accommodates motor inputs of 0.12 kW and 0.18 kW, delivering gear ratios from i = 3.83 to i = 99 and output torques reaching up to 120 Nm—significantly more than the R17 in the same compact class. At just 9 kg, the EP-R27 is a lightweight yet robust solution for OEMs designing high-density machine layouts. Explore our complete gear reducer lineup for the full R-series torque range.
The EP-R27 is designed around the same core engineering principles that define every R-series gear unit: precision helical gearing for low-noise, high-efficiency power transmission; sealed synthetic lubrication for maintenance-free operation; and a modular housing architecture supporting both foot-mount and flange-mount output configurations. These properties, combined with the unit's slender profile, make the EP-R27 a preferred choice in applications where worm gear reducers would introduce too much efficiency loss, and where larger helical units would not physically fit.
Ever Power R-series standard foot-mount inline helical gear reducer
Model Configurations
R27
Foot-mount, solid output shaft. Standard horizontal installation for conveyor, feeder, and light mixer drives.
Foot-mount, solid output shaft. Standard horizontal installation for conveyor, feeder, and light mixer drives.
RF27
Flange-mount output variant for direct coupling to machine input faces, eliminating coupling alignment steps.
Flange-mount output variant for direct coupling to machine input faces, eliminating coupling alignment steps.
R27R17 / RF27R17
Two-stage combination: frame-17 pre-stage plus frame-27 output stage, extending ratio coverage to i = 99 without changing the output housing.
Two-stage combination: frame-17 pre-stage plus frame-27 output stage, extending ratio coverage to i = 99 without changing the output housing.
Technical Specifications
| Parameter | Value |
|---|---|
| Frame Size | 27 |
| Motor Power | 0.12 – 0.18 kW |
| Gear Ratio i | 3.83 – 99 |
| Max Output Torque | up to 120 Nm |
| Weight | 9 kg |
| Radial Load Capacity | up to 4,152 N |
| Mounting Positions | M1 – M6 |
| Lubrication | Synthetic oil, sealed for life |
| Protection Class | IP55 |
| Efficiency per Stage | > 96% |
Selection Table – R27 (0.12 kW, 4P, constant power)
| Output Speed [rpm] | Output Torque [Nm] | Ratio i | Radial Load [N] | Service Factor fB |
|---|---|---|---|---|
| 154 | 5 | 9.37 | 3886 | 0.80 |
| 131 | 6 | 11.01 | 4000 | 0.95 |
| 113 | 7 | 12.72 | 4085 | 1.10 |
| 105 | 7 | 13.74 | 4114 | 1.20 |
| 92 | 7 | 15.67 | 4152 | 1.40 |
Key Engineering Features
Extended Ratio Range
Covering i = 3.83 to 99 within one frame size, the EP-R27 eliminates the need for multiple stock-keeping units to serve the full speed range of a machine family. One gear unit body, many applications.
Covering i = 3.83 to 99 within one frame size, the EP-R27 eliminates the need for multiple stock-keeping units to serve the full speed range of a machine family. One gear unit body, many applications.
Low Noise Transmission
Precision-hobbed helical gears produce continuous tooth contact, reducing the impact noise inherent in spur gearing. Typical A-weighted sound pressure levels stay below 70 dB(A) in free field at 1 m.
Precision-hobbed helical gears produce continuous tooth contact, reducing the impact noise inherent in spur gearing. Typical A-weighted sound pressure levels stay below 70 dB(A) in free field at 1 m.
Universal Motor Interface
IEC B5 and B14 flange interfaces accept AC induction, brake, and inverter-duty motors from any standard manufacturer without custom adapters.
IEC B5 and B14 flange interfaces accept AC induction, brake, and inverter-duty motors from any standard manufacturer without custom adapters.
IP55 Environmental Protection
Shaft seals and housing gaskets provide robust protection against dust jets and water sprays, qualifying the EP-R27 for outdoor installations and wet processing environments.
Shaft seals and housing gaskets provide robust protection against dust jets and water sprays, qualifying the EP-R27 for outdoor installations and wet processing environments.
Mounting Positions M1–M6
Available mounting positions M1–M6 for R-series inline helical gearmotors
M1: Horizontal shaft right — standard belt conveyor and feeder installations.
M2: Horizontal shaft left — mirror-image machine layouts.
M3: Shaft vertically downward — agitators, screw feeders in tanks.
M4: Shaft vertically upward — overhead drives, cooling fans.
M5: Horizontal motor, shaft angled down — compact side-entry drives.
M6: Horizontal motor, shaft angled up — inclined conveyor head drives.
Model Code Explanation
Model number designation — Ever Power R-series inline helical gearmotor
| Code Element | Meaning |
|---|---|
| R | Inline helical gear series |
| F (optional) | Flange output mount (absent = foot mount) |
| 27 | Frame size designation |
| R17 suffix | Frame-17 pre-stage for extended ratio (e.g., R27R17) |
Typical Application Fields
Textile & Yarn Processing
Winding, drafting, and traversing systems where precise speed ratios and low vibration protect yarn tension uniformity.
Winding, drafting, and traversing systems where precise speed ratios and low vibration protect yarn tension uniformity.
Small Conveyor & Feeder Systems
Vibratory feeders, belt feeders, and small sorting conveyors in electronics and pharmaceutical assembly lines.
Vibratory feeders, belt feeders, and small sorting conveyors in electronics and pharmaceutical assembly lines.
Printing & Paper Machinery
Register control drives and tension rollers in printing presses, laminating machines, and paper slitters require the consistent speed and low backlash characteristic of helical inline units.
Register control drives and tension rollers in printing presses, laminating machines, and paper slitters require the consistent speed and low backlash characteristic of helical inline units.
Customer Case Studies
China · Textile Machinery OEM
★★★★★
A textile machinery manufacturer in Zhejiang integrated EP-R27 units into their narrow-fabric loom tensioning systems. The low-noise operation was critical for the open factory floor environment. "We replaced worm gearboxes that were running at 65–70°C surface temperature. The EP-R27 runs at 38–42°C under the same load—the energy saving alone cut our monthly electricity cost by 12% on those lines."
South Korea · Printing Equipment
★★★★★
A Korean printing equipment company selected EP-R27 gearmotors for the web-tension control rolls of their flexographic printing press line. Consistent speed and minimal backlash were the primary selection criteria. "Register accuracy improved immediately after switching to the EP-R27. The output shaft runs smoothly without the slight hunting we observed on our previous worm-drive units at low speed."
Netherlands · Pharmaceutical Automation
★★★★☆
A Netherlands-based pharmaceutical automation integrator used EP-R27 gearmotors in blister-pack transport mechanisms. The IP55 sealing was essential for wash-down compliance. "We've been running six units continuously in a humidity-controlled cleanroom environment for 14 months. No corrosion on external surfaces, no lubricant leakage—the units are performing exactly as specified."
Frequently Asked Questions
For technical datasheets, CAD models, and selection support for the EP-R27, visit our company page or contact our technical sales team directly.
Request EP-R27 Pricing & Technical Data
Send your speed, torque, and mounting requirements for a fast, tailored response. Sample quantities available.
Blogs Updated
Coupling Alignment for Inline Helical Gearbox Installations
Flexible couplings accommodate limited relative movement, but poor shaft alignment still affects bearings and seals.
Helical Gearbox Oil Leak Diagnosis and Seal Protection
Oil observed on a housing may have traveled from a vent, joint or shaft seal; finding the first wet point is essential.