EP-R37 Helical Gearmotor – 0.12~160kW Inline Speed Reducer
The EP-R37 helical gearmotor represents a key mid-range model in Ever Power's R-series inline helical gear reducer family. Frame size 37 bridges the gap between the compact EP-R17/R27 units and the higher-torque EP-R47 and above, making the EP-R37 one of the most widely deployed gearmotors in medium-duty industrial automation. With an operating weight of just 14–16 kg depending on configuration, yet capable of continuous operation across a broad motor power spectrum, this inline helical speed reducer suits applications requiring reliable, low-noise speed reduction with a compact installation envelope.
Motor power compatibility ranges from 0.12 kW to higher ratings depending on gear ratio and motor pole configuration, with gear ratios spanning i = 3.57 (for higher-speed outputs) up to i = 135 (for very-low-speed, high-torque drives). Output torque reaches up to 440 Nm at the frame 37 level. This wide operating envelope means a single EP-R37 platform can serve a remarkably diverse range of machine types by simply changing the motor and gear ratio specification. Read about our broader range of gear reducer products on our homepage.
Ever Power R-series standard foot-mount inline helical gear reducer
Available Configurations
Frame size R37 is available in the following mechanical variants to accommodate different machine architectures:
Standard foot-mount inline helical gear unit. Solid output shaft, coaxial with motor input. Preferred for horizontal conveyor and mixer drives.
Flange-mount output variant. The flanged housing mates directly to the driven machine's input face, eliminating coupling alignment steps.
Shaft-input configuration, where the motor is connected via a rigid or flexible coupling to the gear unit input shaft, rather than via an IEC flange adapter. Suitable for retrofit applications with non-standard motors.
Two-stage combination unit, integrating a frame-17 first-stage reducer with the frame-37 output stage for extended ratio coverage while keeping the output torque within the R37 envelope.
Engineering Advantages of the EP-R37
A single R37 frame can be fitted with different gear stage combinations to cover ratios from approximately 3.57 to 135, reducing the number of distinct gearbox platforms a machine builder needs to stock.
Helical gears generate less noise and vibration per transmitted watt than spur or worm gears. Noise levels typically remain below 70 dB(A) at rated load and speed, benefiting both operator comfort and precision measurement environments.
The tapered roller output bearings on the EP-R37 accept significant radial and axial loads from chain sprockets, belt pulleys, and pinion drives—without requiring external bearing support structures.
Standard IEC B5 and B14 motor flanges allow direct mounting of any standard AC motor from leading manufacturers. Custom adapters for servo, brake, and variable-speed motors are available from Ever Power.
The R37 housing is machined to accept both foot-mount and flange-mount output configurations. This modular approach simplifies spare-parts logistics: one gear unit body serves multiple installation types.
The aluminium die-cast housing of the R37 dissipates heat efficiently, maintaining stable operating temperatures across the full duty cycle without requiring auxiliary cooling fans for most standard applications.
EP-R37 Technical Specifications
| Parameter | Value / Range |
|---|---|
| Frame Size | 37 |
| Motor Power Input Range | 0.12 kW – 160 kW (configuration dependent) |
| Gear Ratio (i) | 3.57 – 135 (single and two-stage) |
| Max Output Torque | up to 440 Nm |
| Gear Unit Weight (R37) | 14 kg (foot) / 16 kg (flange) |
| Permitted Radial Load | up to 5,681 N (varies by ratio) |
| Mounting Positions | M1 – M6 |
| Motor Pole Compatibility | 4P, 6P (4P most common) |
| Housing Material | Die-cast aluminium |
| Lubrication | Synthetic gear oil, sealed for life |
| Output Configuration | Solid shaft (R37) / Flange (RF37) |
| Gear Stages | 2-stage (standard) / 3-stage (with R17 pre-stage) |
| Transmission Efficiency | > 96% per stage |
| Protection Class | IP55 standard |
Selection Parameter Table – R37 (0.12 kW, 4P Motor)
| Output Speed [rpm] | Output Torque [Nm] | Gear Ratio i | Radial Load [N] | Service Factor fB | Model |
|---|---|---|---|---|---|
| 109 | 7 | 13.48 | 4000 | 0.95 | R27R17 |
| 92 | 7 | 16.00 | 4066 | 1.00 | R27R17 |
| 68 | 9 | 19.35 | 4085 | 1.15 | R27R17 |
| 163 | 6 | 8.10 | 3914 | 0.85 | R37 |
| 113 | 8 | 11.59 | 4085 | 1.00 | R37 |
| 68 | 13 | 19.35 | 4200 | 1.80 | R37 |
| 58 | 15 | 22.68 | 5662 | 3.20 | R37 |
Installation Orientations – M1 to M6
Available mounting positions M1–M6 for R-series inline helical gearmotors
The EP-R37 is designed for universal installation versatility. All six IEC-standard mounting orientations are supported, with the sealed lubrication system automatically maintaining correct oil levels in each position. This makes the EP-R37 particularly valuable in multi-axis machine designs where gearbox orientation must match the geometry of the driven mechanism rather than the convenience of the drive layout:
EP-R37 Model Number System
Model number designation — Ever Power R-series inline helical gearmotor
| Code Position | Designation | Options |
|---|---|---|
| 1st character | Series | R = inline helical |
| 2nd character (opt.) | Output type | F = flange; X = shaft-input; blank = foot mount |
| Frame number | Gear unit size | 37 |
| Suffix (opt.) | Pre-stage size | R17 = frame 17 pre-stage (for extended ratio) |
| Motor poles | Speed reference | 4P (1450 rpm), 6P (960 rpm) |
Applications Across Industries
The EP-R37's torque envelope and ratio range position it as a go-to solution for equipment designers across a wide set of industries. Its noise advantage over worm gear alternatives and its compact inline form factor over bevel-helical alternatives make it the economical choice for medium-duty applications. For higher-torque requirements, see our full gear reducer lineup.
Belt conveyors, roller tables, and sortation systems in warehouses and distribution centres regularly use the EP-R37 due to its reliable torque output and ease of motor replacement in the field.
Seed drills, sprayers, and grain handling augers benefit from the EP-R37's robust radial load capacity and resistance to dust ingress from the IP55 sealing system.
Mixers, screens, and crushers in concrete block plants and ceramic tile production lines specify the EP-R37 for its ability to start under load and maintain consistent speed under variable feed conditions.
Small hydropower gate actuators and solar tracker pivots increasingly use inline helical gearmotors for their high efficiency and sealed, maintenance-free design.
Customer Case Studies
A Queensland-based agricultural machinery manufacturer was replacing belt-and-pulley drive systems on their grain auger range with direct-coupled gearmotors. They tested three suppliers over six months and selected the EP-R37 based on its sealed lubrication and dust resistance. “We've had units running in dusty grain harvest conditions for two full seasons with zero gearbox failures. The sealed oil system means our farmers don't have to think about gearbox maintenance during the busy harvest period.”
An Italian packaging line integrator based in Emilia-Romagna specified EP-R37 gearmotors for the infeed conveyors on a family of carton-erecting machines. The low acoustic signature was a selling point for their customers in Germany who require noise levels under 72 dB(A) in the production area. “With the EP-R37, our machines comfortably meet the noise requirement without any additional acoustic enclosures. We've now standardised on this unit for our complete conveyor product range.”
A São Paulo manufacturer of block-making machines retooled their vibration table drive system using EP-R37 gearmotors. The application demands start-under-load performance multiple times per minute. “We were replacing units every six months with our old worm reducers due to heat build-up. After switching to the EP-R37, which runs cooler and more efficiently, we've had the same units operating for 20 months with no issues. The total cost of ownership is dramatically better.”
Frequently Asked Questions
What is the maximum output torque of the EP-R37?
Can the EP-R37 be used with a VFD (variable frequency drive)?
What is the difference between R37 and RF37?
What MOQ and lead time apply to EP-R37 orders?
How often does the EP-R37 need lubrication maintenance?
Partner With Ever Power for Your R37 Requirements
Ever Power supplies EP-R37 gearmotors to OEMs, system integrators, and distributors worldwide. Our application engineering team is available to assist with selection, provide dimensional drawings and 3D CAD data, and advise on motor pairing for specific speed/torque requirements. Explore the Ever Power company story or reach out via our contact page to discuss your project.
Enquire About the EP-R37 Inline Helical Gearmotor
Send us your speed, torque, and mounting requirements for a tailored selection. Mixed orders and sample quantities are welcome.