EP-R37 Helical Gear Reducer – Inline Coaxial Gearmotor

The EP-R37 inline helical gear reducer delivers up to 440 Nm output torque across gear ratios i=3.57–135, covering motor powers from 0.12 kW to wide-range configurations. M1–M6 mounting, IP55. MOQ: 1–5 sample units; mixed orders from ~USD 1,500; lead time 10–25 working days.

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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.

R-series inline helical gear reducer

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:

R37
Standard foot-mount inline helical gear unit. Solid output shaft, coaxial with motor input. Preferred for horizontal conveyor and mixer drives.
RF37
Flange-mount output variant. The flanged housing mates directly to the driven machine's input face, eliminating coupling alignment steps.
RX37 / RXF37
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.
R37R17 / RF37R17
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

Wide Ratio Coverage in One Frame
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 Tooth Profile – Low Noise
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.
High Radial Load Capacity
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.
Universal Motor Compatibility
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.
Modular Housing Design
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.
Consistent Temperature Performance
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

R-series M1-M6 mounting positions

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:

M1 – Horizontal, shaft right: Standard conveyor drives, horizontal agitators, pump drives with horizontal shafts.
M2 – Horizontal, shaft left: Mirror-image installations for left-hand machine layouts.
M3 – Vertical, shaft down: Screw conveyors, agitators in tanks, downward-feeding drive systems.
M4 – Vertical, shaft up: Overhead drives, cooling tower fans, ceiling-mounted positioning systems.
M5 – Horizontal motor, shaft angled down: Side-entry drive solutions where shaft height is constrained.
M6 – Horizontal motor, shaft angled up: Inclined conveyor head drives and upward-angled shaft installations.

EP-R37 Model Number System

R-series model designation chart

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.

Material Handling Equipment
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.
Agricultural Machinery
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.
Building Materials Processing
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.
Renewable Energy
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

Australia · Agricultural Equipment OEM
★★★★★

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."

Italy · Packaging Line Integrator
★★★★★

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."

Brazil · Construction Materials
★★★★☆

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?
The EP-R37 delivers maximum output torque up to approximately 440 Nm, achieved at higher gear ratios with appropriately rated motor input power. At lower gear ratios, output torque is lower but output speed is higher, allowing the user to optimise the speed/torque trade-off for their specific application requirement.
Can the EP-R37 be used with a VFD (variable frequency drive)?
Yes. The EP-R37 gear unit is fully compatible with variable frequency drive (VFD) operation. The helical gear set, sealed bearings, and synthetic lubrication all tolerate the variable speed conditions typical of VFD-driven systems. When ordering, specify an inverter-duty (VFD-rated) motor to ensure adequate cooling at low speeds. Standard operating frequency range is 10–60 Hz for most standard induction motors.
What is the difference between R37 and RF37?
The R37 features a foot-mount housing with a solid output shaft, while the RF37 has a flange-mount output that mates directly to the driven machine's input face—eliminating the need for a separate mounting bracket or shaft coupling alignment. The internal gear set, ratio options, and performance data are identical for both variants. The choice depends solely on the mounting interface your machine requires.
What MOQ and lead time apply to EP-R37 orders?
MOQ is flexible. Trial quantities of 1–5 units are available for new customers evaluating the EP-R37 for their application. Mixed orders combining R37 with other EP-R series models are welcome, with a minimum order value of approximately USD 1,500. Standard lead time is 10–25 working days for stocked configurations; non-standard ratios or custom shaft dimensions require 20–45 working days. Incoterms available: EXW, FOB, CIF, DAP (others by negotiation).
How often does the EP-R37 need lubrication maintenance?
Under standard operating conditions, the EP-R37 is filled for life with synthetic gear oil and requires no periodic oil changes. The sealed housing prevents contamination ingress and oil loss, making the unit maintenance-free for the duration of its service life in most applications. For duty cycles involving extended high-temperature operation or severe shock loading, contact Ever Power's technical team for specific lubrication and maintenance guidance.

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.

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RP Techniek BV (EVER-POWER Netherlands Branch)

Mail:

sales@netherlandsdrive.com

Professional production Speed Reducer, Worm Gearbox, Sprocket, Rack, Gear, Roller Chain, V-Belt Pulley, Motor, PTO Drive Shaft, Chain CC600, Taper Bushes Manufacturer and Supplier.

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