Description
R Series Helical Gearbox – High-Efficiency Inline Helical Gear Reducer
The R Series Helical Gearbox is a high-efficiency inline gear reducer designed for conveyors, material handling systems, packaging machinery, mixers, processing equipment, and general industrial drive applications. Its precision helical gearing provides smooth power transmission, low operating noise, reliable torque output, and long service life.
Available in multiple frame sizes, reduction ratios, motor configurations, and mounting arrangements, the R Series can be selected for new OEM machinery or evaluated as an alternative to existing inline helical geared motors.
For replacement projects, our engineering team can verify the gearbox according to ratio, output torque, shaft dimensions, center height, mounting dimensions, motor frame, and mounting position.
Need help selecting or replacing an R Series gearbox? Contact us with your motor power, required ratio, torque, and installation dimensions.
R Series Helical Gearbox at a Glance
- High-efficiency inline helical gear transmission
- Single-, two-, and three-stage configurations
- Compact modular gearbox construction
- Smooth operation and low operating noise
- Foot and flange mounting options
- Multiple motor configurations
- Suitable for continuous industrial operation
- Engineering support for OEM and replacement projects
- Wide selection of gearbox sizes and ratios
What Is an R Series Helical Gearbox?
An R Series helical gearbox is an inline industrial speed reducer that uses precision helical gear stages to reduce motor speed while increasing available output torque.
Unlike right-angle worm or bevel gearboxes, an inline helical gearbox maintains an inline drive arrangement, making it particularly suitable for conveyors, mixers, processing equipment, packaging machinery, and other applications where compact installation and efficient power transmission are required.
The R Series is available in single-, two-, and three-stage configurations. Its modular construction allows different gear ratios, motor sizes, mounting positions, and output arrangements to be combined according to the application.
High-Efficiency Helical Gearing
Precision helical gears provide gradual tooth engagement, helping achieve smooth torque transmission, reduced vibration, and low operating noise.
Compact Inline Design
The inline input-output arrangement makes the R Series suitable for machinery where installation space is limited and a straightforward drive layout is preferred.
High Torque Capacity
Multiple gearbox frame sizes and reduction stages allow the R Series to cover applications ranging from compact machinery to heavy industrial drive systems.
Flexible Mounting Options
Foot-mounted, flange-mounted, and geared-motor configurations are available to accommodate different machine layouts.
Reliable Industrial Operation
The gearbox is designed for industrial machinery requiring stable speed reduction, continuous torque transmission, and long operating life.
OEM and Replacement Support
Gearbox selection can be based on motor power, ratio, output torque, service factor, shaft dimensions, mounting geometry, and existing gearbox specifications.
R17–R167 Model Range
The R Series covers a broad range of inline helical gear units for light, medium, and heavy-duty industrial applications.
| R Series Size | Typical Application | Gearbox Type | Selection Level |
|---|---|---|---|
| R17 | Small machinery | Inline helical | Compact drive |
| R27 | Light industrial machinery | Inline helical | Light-duty drive |
| R37 | General machinery | Inline helical | Compact industrial drive |
| R47 | Conveyors / OEM machinery | Inline helical | General industrial duty |
| R57 | Material handling | Inline helical | Medium torque |
| R67 | Processing machinery | Inline helical | Medium-heavy duty |
| R77 | Industrial conveyors | Inline helical | Higher torque |
| R87 | Heavy conveyors | Inline helical | Heavy industrial duty |
| R97 | Large machinery | Inline helical | High torque |
| R107 | Heavy machinery | Inline helical | High torque |
| R137 | Heavy industrial machinery | Inline helical | Large industrial drive |
| R147 | Heavy-duty equipment | Inline helical | Large industrial drive |
| R167 | Large industrial machinery | Inline helical | Maximum frame range |
Engineering Note: Final gearbox size should be selected according to required output torque, reduction ratio, input speed, operating hours, load characteristics, service factor, mounting position, and external shaft loads.
R Series Critical Dimensions for Installation & Replacement
When selecting an R Series gearbox for replacement, motor power and reduction ratio alone are not sufficient. The mechanical interface between the gearbox and driven equipment must also be verified.
The following critical dimensions are intended to help engineers perform preliminary installation and replacement screening.
| R Series Size | Output Shaft Ø | Shaft Extension | Key | Center Height | Foot Length | Foot Width | Overall Housing Width |
|---|---|---|---|---|---|---|---|
| R17 | 25 mm | 40 mm | 8 mm | 70 mm | 120 mm | 120 mm | 128 mm |
| R27 | 25 mm | 50 mm | 8 mm | 80 mm | 152 mm | 145 mm | 148 mm |
| R37 | 25 mm | 50 mm | 8 mm | 90 mm | 160 mm | 144 mm | 155 mm |
| R47 | 30 mm | 60 mm | 8 mm | 100 mm | 195 mm | 170 mm | 175 mm |
| R57 | 35 mm | 70 mm | 10 mm | 112 mm | 200 mm | 190 mm | 194 mm |
| R67 | 35 mm | 70 mm | 10 mm | 132 mm | 235 mm | 210 mm | 215 mm |
| R77 | 40 mm | 80 mm | 12 mm | 159 mm | 245 mm | 227 mm | 233 mm |
| R87 | 50 mm | 100 mm | 14 mm | 195 mm | 310 mm | 288 mm | 293 mm |
| R97 | 60 mm | 120 mm | 18 mm | 212 mm | 365 mm | 337 mm | 343 mm |
| R107 | 70 mm | 140 mm | 20 mm | 264 mm | 440 mm | 396 mm | 404 mm |
| R137 | 80 mm | 170 mm | 25 mm | 251 mm | 490 mm | 442 mm | 450 mm |
| R147 | 110 mm | 210 mm | 28 mm | 324 mm | 590 mm | 520 mm | 530 mm |
| R167 | 120 mm | 210 mm | 32 mm | 359 mm | 670 mm | 650 mm | 660 mm |
Important: These dimensions are intended for preliminary installation and replacement screening. Motor-dependent overall length, flange dimensions, and certain mounting dimensions may vary according to motor frame and gearbox configuration.
Always confirm the final dimensional drawing before machining a base plate, coupling, guard, or driven-machine interface.
How to Select an R Series Helical Gearbox
Correct gearbox selection should be based on the actual operating conditions rather than motor power alone.
1. Determine Input and Output Speed
Provide the motor input speed and required machine output speed.
The basic reduction ratio can be calculated as:
Gear Ratio = Input Speed ÷ Output Speed
2. Determine Required Output Torque
Calculate the torque required by the driven machine and consider acceleration, shock loading, and operating conditions.
For applications where torque calculation is required, the gearbox should be selected according to actual operating torque rather than motor power alone.
3. Check the Service Factor
Operating hours, starts per hour, load characteristics, and application duty should be considered when determining the required gearbox service factor.
4. Check Radial and Axial Loads
External loads should be verified when sprockets, pulleys, chains, or other transmission components are installed on the output shaft.
5. Select the Mounting Arrangement
Confirm whether the application requires foot mounting, flange mounting, or another installation configuration.
6. Verify Critical Dimensions
For replacement projects, always compare:
- Output shaft diameter
- Shaft extension
- Key and keyway
- Center height
- Foot mounting dimensions
- Flange dimensions
- Motor frame
- Installation position
R Series Gearbox Replacement Guide
Many customers searching for an R Series helical gearbox are replacing an existing geared motor rather than designing a completely new drive system.
A reliable gearbox replacement therefore requires more than simply matching a model number.
Performance Parameters to Verify
- Motor power
- Input speed
- Reduction ratio
- Required output speed
- Output torque
- Service factor
Mechanical Dimensions to Verify
- Output shaft diameter
- Output shaft length
- Keyway dimensions
- Center height
- Foot mounting pattern
- Flange dimensions
- Motor interface
Operating Conditions to Verify
- Mounting position
- Motor frame
- Operating hours per day
- Number of starts
- Driven load characteristics
- Ambient temperature
- Radial load
- Axial load
Providing the existing gearbox model, nameplate photo, and dimensional drawing allows our engineering team to perform a more accurate cross-reference.
SEW R Series Replacement & Cross-Reference
Our R Series helical gearboxes can be evaluated for applications where OEMs, distributors, or maintenance teams are looking for an alternative source to an existing inline helical geared motor, including applications using SEW-EURODRIVE R Series gearmotors.
However, similar frame designations should not be treated as proof of dimensional interchangeability.
Before confirming a replacement, the following parameters should be compared:
- Reduction ratio
- Output speed
- Output torque
- Service factor
- Output shaft diameter and length
- Keyway
- Center height
- Foot mounting dimensions
- Flange dimensions
- Motor frame
- Mounting position
Do not order a replacement gearbox based only on an R Series frame number.
Send us the existing gearbox nameplate, model number, and installation dimensions so that the mechanical interface can be verified before production.
For a more detailed cross-reference workflow and replacement considerations, see our SEW R Series Equivalent: Technical Comparison & Buyer Guide.
R Series Helical Gearbox Applications
Conveyor Systems
R Series gearboxes provide reliable continuous-duty speed reduction for belt conveyors, roller conveyors, and chain conveyor systems.
Packaging Machinery
Compact inline geared motors are suitable for packaging, filling, labeling, conveying, and production-line equipment.
Material Handling Equipment
The R Series can be used in transfer systems, handling machinery, warehouse equipment, and automated production lines.
Mixers and Agitators
Helical gear reduction provides stable torque transmission for industrial mixers, agitators, and processing machinery.
For applications requiring gearbox selection according to mixer speed, torque and operating duty, see our helical gearbox for mixer and agitator selection guide.
Food Processing Machinery
The R Series is suitable for conveying, processing, and packaging equipment where reliable continuous operation is required.
Industrial Automation
R Series geared motors can be integrated into OEM automation systems and mechanical handling equipment.
Building Material Machinery
Higher-torque models can be used in conveying and processing equipment for building materials and related industrial applications.
General Industrial Machinery
The modular design makes the R Series suitable for a broad range of machines requiring efficient inline speed reduction.
R Series vs F Series vs K Series Gearboxes
The R Series belongs to the helical gearbox family, but shaft arrangement is an important factor when selecting between R, F and K Series gear units.
| Gearbox Series | Gear Technology | Shaft Arrangement | Typical Selection Reason |
|---|---|---|---|
| R Series | Helical | Inline / Coaxial | Efficient inline power transmission |
| F Series | Helical | Parallel-Shaft / Offset | Space-saving parallel-shaft installation |
| K Series | Helical-Bevel | Right-Angle | Efficient 90° power transmission |
Choose an R Series helical gearbox when the motor and output shaft should remain inline.
Consider an F Series parallel-shaft helical gearbox when a parallel but offset shaft arrangement better suits the machine layout.
Consider a K Series helical-bevel gearbox when the application requires an efficient right-angle drive.
Final selection should always consider torque, ratio, mounting geometry, shaft loads and installation space in addition to shaft arrangement.
R Series Helical Gearbox Manufacturer
Taizhou Ubuty Co., Ltd. is a professional manufacturer of industrial gearboxes and geared motors, providing transmission solutions for OEM manufacturers, distributors, importers, and industrial end users.
Our transmission team has extensive experience in gearbox selection, manufacturing, motor matching, dimensional verification, and replacement projects.
For an R Series project, customers can provide:
- Motor power
- Input speed
- Required output speed
- Reduction ratio
- Required output torque
- Mounting position
- Application
- Operating hours
- Required shaft dimensions
For gearbox replacement projects, we recommend providing the existing gearbox nameplate, model number, installation photos, and dimensional drawing whenever available.
This allows our engineering team to evaluate both the required performance and the mechanical installation interface before production.
Explore our complete industrial gearbox product range for inline helical, parallel-shaft helical, helical-bevel, helical-worm, helical-hypoid and worm gearbox solutions.
R Series Helical Gearbox FAQ
What is an R Series helical gearbox?
An R Series helical gearbox is an inline industrial speed reducer that uses helical gear stages to reduce motor speed and increase output torque.
It is commonly used in conveyors, packaging machinery, material handling equipment, mixers, and general industrial drives.
What are the advantages of an inline helical gearbox?
Inline helical gearboxes provide high transmission efficiency, smooth operation, compact installation, low noise, and reliable torque transmission, making them particularly suitable for continuous industrial duty.
Can your R Series replace a SEW R Series gearbox?
It may be possible depending on the specific gearbox and installation.
A replacement should be verified according to ratio, torque, shaft dimensions, center height, mounting footprint, flange dimensions, motor frame, and mounting position rather than model number alone.
What information is required to select an R Series gearbox?
The most important information includes motor power, input speed, required output speed or reduction ratio, output torque, operating hours, load characteristics, service factor, mounting position, and any radial or axial shaft loads.
What dimensions should be checked when replacing an existing gearbox?
Critical replacement dimensions normally include output shaft diameter, shaft extension, keyway, center height, mounting-hole pattern, flange dimensions, and motor interface.
Can you help cross-reference an existing helical gearbox?
Yes.
Provide the existing gearbox model, nameplate photo, dimensional drawing, motor information, and application requirements. The gearbox can then be evaluated according to both performance and installation dimensions.
What applications commonly use R Series helical gearboxes?
Typical applications include conveyors, packaging machinery, food processing equipment, material handling systems, mixers, building-material machinery, industrial automation, and general manufacturing equipment.
What is the difference between R, F and K Series gearboxes?
R Series gearboxes use an inline helical arrangement, F Series gearboxes use a parallel-shaft helical arrangement, and K Series gearboxes combine helical and bevel gearing for right-angle transmission.
The appropriate series depends on shaft arrangement, torque, ratio, installation space and application requirements.
Need an R Series Helical Gearbox for Your Application?
Whether you are selecting a gearbox for a new machine or replacing an existing inline helical geared motor, correct engineering verification can help prevent installation problems and unnecessary machine modifications.
Send us your:
Motor Power + Input Speed + Ratio + Required Torque + Mounting Position + Application
For replacement projects, also send the:
Existing Gearbox Model + Nameplate Photo + Critical Installation Dimensions
Our engineering team can help evaluate the appropriate R Series Helical Gearbox for your application.
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