Gear Reducers & GearBoxes

Gear Reducers & GearBoxes

(40 products)

Precision gear reducers and gearboxes engineered for torque, speed, and durability across a wide range of mechanical applications.

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Why Use a Gear Reducer or Gearbox?

Electric motors are efficient at producing rotational power, but many real-world applications require lower speed and higher torque than a motor can deliver directly. That’s where gear reducers and gearboxes come in.

Increase torque without oversizing the motor

A properly selected reducer can multiply torque to meet load demands often allowing you to use a more practical motor size while still achieving strong starting and running performance.

Control speed for process consistency

Reducers help achieve stable output speeds for conveyors, mixers, handling equipment, packaging lines, and bulk processing systems where controlled movement matters.

Improve drivetrain reliability

Matching torque and speed correctly reduces mechanical stress, minimizes overheating, and helps extend the life of motors, bearings, belts, and driven components.

Key Takeaways: Gear Reducers & Gearboxes at E-Motor Nations

Built for real industrial duty

Designed for high-torque, continuous operation, and rugged environments, ideal for production, material handling, and processing equipment.

Practical options for common mounting needs

Choose the style that fits your layout: right angle (90°) when space is tight, or shaft mount for compact installation directly on the driven shaft.

Ratio-driven performance tuning

Gear ratio selection (e.g., 5:1 to 100:1) helps you dial in the exact balance of output speed and torque your application requires.

Expert support when you need it

If you’re unsure what you need, E-MOTOR NATIONS specialists help you choose the best match before you order.

How to Choose the Right Gear Reducer or Gearbox

Selecting the right unit is mostly about matching load, speed and mounting.

1. Define output speed and required torque
Start with the driven equipment requirements: desired RPM at the output shaft and the torque needed to start and run under load.

2. Choose ratio that matches your motor speed
Gear ratio determines how much you reduce speed (and multiply torque). Example: a 20:1 reducer turns 1750 RPM motor speed into ~87.5 RPM output (before losses).

3. Confirm mounting and shaft configuration
Space, orientation, and installation constraints matter:

Inline vs right-angle layout

Hollow bore vs solid shaft output

Keyed shaft dimensions, flange styles, and mounting position

4. Consider duty cycle and environment
Continuous operation, shock loads, dust, washdown exposure, and temperature all influence reducer sizing, sealing, and lubrication choices.

Gear Reducer Specs That Matter

A reducer might “look right,” but small spec mismatches cause big problems. Pay attention to:

Reduction ratio: Determines output speed and torque multiplication.

Rated torque & service factor: Ensures the unit can handle real load conditions and shock.

Input type & motor interface: Shaft input, C-face/C-flange input, or coupling configuration.

Output style: Solid shaft or hollow bore (shaft mount), keyed or non-keyed, shaft diameter.

Mounting orientation: Foot mount, flange mount, shaft mount, right angle configuration.

Lubrication & sealing: Impacts maintenance intervals and performance in dusty/humid environments.

Shop by Gear Reducer Type

Right Angle Gear Reducers (90°)
Right-angle (90-degree) gear reducers are designed to change drive direction while reducing speed, ideal when you need a compact layout.
Typical range: 5:1 to 100:1 reduction, excellent for low speed / high torque applications, and often chosen when installation space is limited. Notes: C-flanged input options simplify installation and maintenance.


Shaft Mount Reducers
Shaft mount reducers are compact, heavy-duty gear drives that mount directly onto the driven shaft reducing alignment effort and eliminating extra couplings.
They’re widely used in conveyors, material handling, and bulk processing where reliability and quick serviceability matter, delivering efficient power transmission and durable torque capacity.

FAQ

Do electric motors need a gearbox?

Not always. Motors can drive some loads directly, but a gearbox is often needed when your application requires lower output speed, higher torque, or better control than the motor alone can provide especially for conveyors, mixers, and handling equipment.

What is the box on an electric motor called?

In many setups, the “box” attached to a motor refers to the gearbox / gear reducer (speed reducer). If you mean the electrical housing, that’s typically the terminal box (junction box) where wiring connections are made.

What is an electric gearbox?

An electric gearbox (gear reducer) is a mechanical unit paired with a motor to reduce speed and increase torque at the output shaft. It helps match motor performance to the needs of the driven equipment.

What are the three types of gearboxes?

A common high-level classification is:

Helical gearboxes: Efficient, smooth, and widely used for general industrial drives

Worm gearboxes: Compact and good for higher ratios, often used for lower-speed applications

Bevel (or bevel-helical) gearboxes: Right-angle power transmission with strong torque capability

Sources

Sources

E-Motors Nations – Electric Motors collection (catégories & usages)
https://www.emotornations.com/collections/electric-motors

ABB – Motor Nameplate Guide (lecture de la plaque signalétique, puissance, tension, duty, etc.)
https://library.e.abb.com/public/8c335e0214cb48e0b8a567a95d75f1bc/Motor_nameplate_guide.pdf

NEMA – MG-1 Motors and Generators (terminologie, types d’enveloppes ODP/TEFC, standards nord-américains)
https://www.nema.org/standards/view/nema-mg-1-motors-and-generators

Schneider Electric – Duty Cycle S1–S4 Explained (définition des cycles de service)
https://www.se.com/ww/en/faqs/FAQ000221891/

Grainger – Electric Motor Buying Guide (critères pratiques de sélection : application, alimentation, environnement)
https://www.grainger.com/know-how/equipment-information/kh-electric-motor-buying-guide

EASA – Electric Motor Troubleshooting Basics (recommandations fiabilité & environnement)
https://www.easa.com/

ABB – Motor Nameplate Guide
Pour le rôle de la nameplate, les données de puissance/tension/vitesse/duty.
https://library.e.abb.com/public/8c335e0214cb48e0b8a567a95d75f1bc/Motor_nameplate_guide.pdf

NEMA – MG-1 Motors and Generators
Pour les définitions normalisées (frame sizes, synch speeds, types d’enveloppes, etc.).
https://www.nema.org/standards/view/nema-mg-1-motors-and-generators

Grainger – Electric Motor Buying Guide
Pour les impacts pratiques d’une mauvaise tension/phase, le dimensionnement et la fiabilité.
https://www.grainger.com/know-how/equipment-information/kh-electric-motor-buying-guide

EASA – Electric Motor Troubleshooting Basics
Pour les risques de surchauffe, de défaillance prématurée et les bonnes pratiques de remplacement.
https://www.easa.com/

Fitzgerald & Kingsley’s Electric Machinery – manuel universitaire de référence sur les machines AC et DC, leur principe et leurs usages.
https://www.mheducation.com/highered/product/fitzgerald-and-kingsleys-electric-machinery-umans.html?viewOption=student

Stephen J. Chapman – Electric Machinery Fundamentals – manuel qui détaille notamment les différences d’applications entre moteurs AC et DC et le rôle des variateurs.
https://books.google.com/books/about/Electric_Machinery_Fundamentals.html?id=wyHAuQAACAAJ

Marathon Electric – Electric Motors (portfolio AC & DC pour l’industrie) – illustre que la plupart des applications générales utilisent des moteurs AC, les DC étant réservés à des besoins spécifiques de contrôle.
https://www.marathonelectric.com/electric-motors

WEG – Electric Motors / Specification Guides – documentation fabricant sur les familles de moteurs AC, DC et leurs domaines d’application.
https://static.weg.net/medias/downloadcenter/ha0/h5f/WEG-motors-specification-of-electric-motors-50039409-brochure-english-web.pdf

E-Motors Nations – Electric Motors collection – pour l’alignement avec les catégories réellement vendues (majoritairement AC pour HVAC, pompes, compresseurs, etc.).
https://www.emotornations.com/collections/electric-motors

IEC 60034-1 – Duty cycle classification (S1, S2, S3, S4, etc.)
Résumés / applications :
https://electrical-engineering-portal.com/10-duty-types-three-phase-asynchronous-motors
https://www.engineeringtoolbox.com/iec-duty-cucles-d_739.html
https://www.electricalje.com/2018/06/motor-duty-class-and-its-classification.html

IEC 60034-30-1 – IE efficiency classes (IE1, IE2, IE3, IE4)
ABB technical note on IEC 60034-30-1: https://library.e.abb.com/public/db64d153e3c346938e18916e66fb1d0d/9AKK107319%20EN%2005-2018_20848_ABB_Technical_note_IEC_60034_30_1.pdf
AVSLD summary of IEC 60034-30-1: https://avsld.com.sg/iec-60034-30-standard-on-efficiency-classes-for-low-voltage-ac-motors/

NEMA Premium® & DOE motor efficiency rules
NEMA Premium program: https://www.nema.org/standards/Technical/NEMA-Premium
DOE / NEMA joint recommendations and updated motor rule:
https://www.nema.org/news-trends/view/department-of-energy-issues-motor-efficiency-standards-based-on-recommendations-from-joint-stakeholders
https://www.pumpsandsystems.com/what-users-should-know-about-department-energys-latest-motor-rules

EASA – Motor protection & reliability
Resource library – motor protection: https://easa.com/resources/resource-library/category/motor-protection-2
“Getting the Most From Your Electric Motors” (reliability & protection focus): https://easa.com/resources/resource-library/increasing-motor-reliability

ABB – How to read a NEMA motor nameplate (rôle des infos de plaque pour installer, réparer ou remplacer un moteur)
https://new.abb.com/news/detail/80778/how-to-read-a-nema-motor-nameplate

NEMA – MG-1 Motors and Generators (référentiel de standards NEMA pour moteurs, nameplate, tensions, frames, etc.)
https://www.nema.org/docs/default-source/standards-document-library/ansi_nema-mg-1-2016-contents-and-foreword.pdf

HECO – NEMA Standards Electric Motor Frame (ebook sur la lecture des NEMA frame sizes pour le remplacement)
https://hecoinc.com/wp-content/uploads/2023/08/NEMA-standards-electric-motor-frame-Ebook-V3.pdf

Regal Rexnord – Motor Frame Size Chart (Quick Reference)
https://www.regalrexnord.com/products/regal-rexnord-electric-motors/quick-reference-motor-dimensions

EASA – Electric Motors: Repair or Replace? (outil décisionnel sur réparer vs remplacer, utilisé comme cadre “industrie”)
https://universalrewind.com/wp-content/uploads/2023/07/EASA_RepairReplace_SalesTool_0821.pdf

EASA – Electromechanical Resource Center
https://easa.com/erc

E-Motor Nations – Electric Motors collection (filtres par HP, RPM, voltage, frame, etc.)
https://www.emotornations.com/collections/electric-motors

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