Vortex VR-Series Inline Helical Speed Reducers

The Vortex VR-Series is a NEMA C-face mounted inline helical gear speed reducer with input and output shafts on the same axis. Available in eight unit sizes (VR28 through VR98) covering fractional through 20 HP applications and ratios from 5:1 through 100:1, the VR-Series delivers high mechanical efficiency (typically 95% or above) and high torque density in a compact, sealed cast iron housing. Texas Belting and Supply stocks the complete Vortex VR line in Houston for same-day shipping on conveyor, packaging, mixer, and OEM drive applications.

About the Vortex VR-Series

An inline helical reducer takes a high-speed input from a NEMA C-face motor and steps it down through one or more helical gear stages to a coaxial output shaft. Because the input and output are on the same axis, an inline reducer can replace a direct drive in installations where the motor was previously coupled directly to the driven load, with no need to reposition the load or change the mounting footprint significantly.

Helical gear teeth engage gradually rather than abruptly like spur teeth, which produces smoother operation, lower noise, and higher load capacity per unit size. Combined with the synthetic gear oil charge and sealed cast iron housing, the VR-Series provides long service life with minimal maintenance in indoor industrial, outdoor protected, and washdown environments.

Available Sizes and Motor Frame Options

The VR line is sized by torque class rather than center distance. Each Vortex VR size covers an HP range and accepts a specific set of NEMA C-face motor frames. Use this table to identify the right VR size for your motor and load:

How to Read a Vortex VR Part Number

VR part numbers follow a structured format. Take VR28-10-140TC as the example:

Applications

VR-Series inline helical reducers are used wherever a compact, high-efficiency fixed-speed reduction is needed. Typical installations include:

• Belt conveyors in distribution, packaging, and material handling lines
• Roller conveyors and live roller drive applications
• Packaging machinery: case packers, palletizers, wrappers, labelers
• Mixers, blenders, and agitators in food, chemical, and pharmaceutical processes
• Industrial blowers and fans in HVAC and process ventilation
• OEM machinery requiring a compact, sealed gear reducer with high efficiency
• Pump drives where helical efficiency reduces motor sizing and energy cost

Competitor Cross-References

The Vortex VR-Series cross-references dimensionally with major inline helical reducer brands when matched by torque class, NEMA motor frame, gear ratio, and output shaft. Match the existing reducer's motor frame size, output shaft diameter, gear ratio, and approximate overall dimensions to the corresponding Vortex VR size. The downloadable spec sheet PDF on each product page shows the full dimensional drawing for direct comparison.

Vortex VR-Series interchanges by matching motor frame, ratio, output shaft, and torque class. Confirm dimensions against the spec sheet PDF before substituting. For exact cross-reference assistance, call (888) 203-2358.

Selection Guide

To select a Vortex VR reducer for your application, work through four questions in order:

1. What is your motor HP and frame? Match the HP range and NEMA frame to the appropriate VR size from the table above. A 1 HP motor on a 140TC frame fits VR28 or VR38. A 5 HP motor on a 184TC fits VR48 or VR58.
2. What output speed do you need? Output RPM equals motor RPM divided by the gear ratio. A 1750 RPM motor through a 10:1 VR gives 175 RPM at the output, less the small actual-ratio variance documented on the spec sheet.
3. What torque does the driven load require? Compare required output torque to the VR mechanical rating at your ratio. Build in a service factor of 1.0 for steady continuous duty, 1.4 for moderate shock, 2.0 for severe shock or starting torque applications.
4. What output shaft and orientation does your driven equipment need? All VR units have a solid output shaft with keyway. Confirm the shaft diameter, length, and keyway dimensions match your driven coupling, sheave, or pinion.

If you would prefer that we size the reducer for your application, call (888) 203-2358 or open a quote and tell us your application: driven equipment, motor HP, required output speed, and operating cycle. We will spec the right Vortex VR and confirm stock from our Houston warehouse.

Frequently Asked Questions

What is the Vortex VR-Series inline helical speed reducer used for?

The Vortex VR-Series is a NEMA C-face mounted inline helical gear reducer where the input and output shafts are coaxial (in line with each other) rather than at 90 degrees like a worm gear. Inline helical reducers are used wherever a fixed speed reduction is needed in a compact, high-efficiency package: belt and roller conveyors, packaging machinery, mixers, blowers, and OEM machinery. Helical gear teeth carry load more efficiently than worm gears, so VR reducers typically run at 95% or higher mechanical efficiency, generate less heat, and have higher torque capacity per unit size than equivalent worm gear reducers.

How do I read a Vortex VR part number?

VR part numbers follow the format VR[size]-[ratio]-[motor frame]. Take VR28-10-140TC as the example. VR identifies the series. 28 is the Vortex unit size (size 28, a fractional through 1 HP class reducer). 10 is the nominal gear ratio (10:1, with an exact ratio of 10.13:1). 140TC is the NEMA C-face motor frame that the input flange accepts. The VR unit ships ready to bolt a standard 140TC NEMA motor directly to the input.

What is the difference between an inline helical reducer and a worm gear reducer?

Inline helical reducers (VR-Series) and worm gear reducers (X / XS / XH-Series) both reduce motor speed to driven load speed, but use different gear arrangements. Inline helical uses parallel helical gear teeth, with input and output shafts on the same axis. Worm gear uses a worm screw and gear arrangement, with output shaft at 90 degrees to input. Inline helical advantages: higher mechanical efficiency (typically 95% or above versus 50 to 90% for worm), higher torque capacity per unit size, less heat generation, longer service life. Worm gear advantages: lower cost at small sizes, inherent self-locking at higher ratios, quieter operation. Choose VR-Series when efficiency, torque density, and heat are the priorities; choose worm gear when cost, footprint, or self-locking is the priority.

What sizes and ratios are available?

The VR-Series is available in eight unit sizes (VR28, VR38, VR48, VR58, VR68, VR78, VR88, VR98) covering fractional through 20 HP applications. Nominal ratios range from 5:1 through 60:1 across most sizes, with VR68 also available in higher ratios up to 100:1. Available motor frames scale with size: smaller VRs (28, 38) accept NEMA 56C through 145TC, mid sizes (48, 58, 68) add 180TC and 210TC, larger sizes (78, 88, 98) accept up to 280TC. See the size table above for complete availability per size.

Does the Vortex VR-Series cross-reference to SEW, Sumitomo, Nord, or Bonfiglioli inline reducers?

Yes, the Vortex VR-Series interchanges dimensionally with major inline helical reducer brands at matching torque class and motor frame. Without a published 1-to-1 part number cross-reference table, the practical approach is to match the existing reducer's torque class, NEMA motor frame, gear ratio, output shaft diameter, and overall dimensions to the corresponding Vortex VR size. The downloadable spec sheet PDF on each product page shows the full dimensional drawing for direct comparison to an existing competitive nameplate. Call (888) 203-2358 if you need help cross-referencing a specific competitor part number.

Does the VR-Series use synthetic oil?

Yes. All Vortex VR-Series reducers stocked at Texas Belting and Supply ship with a synthetic gear oil charge suitable for service temperatures from minus 20 to 200 degrees Fahrenheit. The synthetic charge extends service intervals versus mineral oil and improves cold-start performance in outdoor and unheated industrial environments. Oil capacity varies by VR size; see the downloadable spec sheet PDF for the exact fill volume for each unit.

Does the VR-Series ship from Houston?

Yes. All Vortex VR-Series reducers in our active inventory ship from Texas Belting and Supply's Houston, TX warehouse the same business day for orders placed before 3 PM Central time. Standard sizes VR28 through VR98 in common ratios and motor frame combinations are generally stocked. Non-stocked configurations may have a one to three business day lead time. Call (888) 203-2358 to confirm current inventory and request a quote.