HBB renders with iE3 motors
HBB renders with iE3 motors
HBB renders with iE3 motors
HBB renders with iE3 motors

Cyclo® Helical Buddybox

Helical gearbox with Cyclo reducer input. Features keyless, Steel Taper-Grip® bushing for easy installation.

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Offset parallel, helical gearbox in a rugged integral, shaft-mounted design.

  • Integrated Cyclo® technology
  • Keyless Taper-Grip® Bushing or Keyed Hollow Bore
  • Ideal for Screw-Conveyor applications


Input Integral gearmotor, quill and C-face adapter
Output Taper-Grip® Bushing, Keyed Hollow Bore, Screw Conveyor
Ratios 11:1 up to 26,000:1 and greater
Torque Up to 8,565 Nm
Power Range 0.1 to 30 kW
Mounting Hollow Shaft, Flange, Face
Options Integral Motor, C-Face
Motor Standards NEMA, IEC, JIS, UL, CSA, CE


Cyclo® HBB

Sumitomo’s Cyclo® Helical Buddybox® (Cyclo® HBB) speed reducers and gearmotors provide innovative shaft-mounted drive solutions for demanding applications. The Cyclo® HBB combines the quiet, efficient and reliable performance of the Cyclo® input with the rugged helical-gear output. The modular design provides a compact, efficient product and the most flexible range of output speed and torque combinations available.

Key Facts

Max Bore Size
Max Rating

Modular Design

Interchangeable cast-iron housings in flange, face or shaft-mount configurations.

Cyclo® Technology

Quiet, efficient and reliable operation with high-torque density and compact size.

Taper-Grip® Bushing

Provides quick, easy mounting and removal of the unit without the need for a custom shaft.

No Thermal Limitations

Highly-efficient design never needs an external fan.

Rugged Monoblock Housing

Monoblock-housing design eliminates the possibility of leaks at housing split.

CEMA Screw Conveyor

CEMA standard shafts and compact design eliminates belts, sheaves and guards, saving space and reducing maintenance.

Double-Output Seals

Prevent lubricant leaks and protect from contamination.

Mounting Versatility

Flange, Face, and Shaft Mounting options allow for universal mounting.

Long Life Bearings

Oversized, heavy-duty bearings for maximum strength and service life.

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Do you have questions about the Cyclo HBB? Below are some of our most commonly asked questions, or you can view our Support area under Knowledge for more frequently asked questions and answers.

In general terms, the speeds are 1750 and 1165 RPM.  The selection tables in our catalog are based on 1750 RPM.  When other input speeds are used, the horsepower and torque ratings will vary.

To select the proper reducer for your application, you will need to know:Application: type of driven machine
Hours of operation per day
Motor horsepower (HP) and speed (RPM)
Loading Conditions
Mounting Position 
Ambient environment (altitude, dusty, chemical, explosive, water) 
Ambient temperature and humidity 
You must also note any special environment factors or operation requirements.  This information will be important in determining the your application's service factor. 

In general, reducers and gearmotors are rated for specific conditions and operating requirements of the application by the use of AGMA-defined Service Factors.  There are three AGMA load classifications for reducers: uniform (U), moderate shock (M), and heavy shock (H). Refer to our catalog for a list of AGMA load classifications. These Service Factors are used in the product selection process to adjust for the specific conditions and operating requirements of your application.

The standard ratings for Cyclo® HBB are based on 10-hour daily service under conditions of uniform loads (equivalent to AGMA service factor 1.0).  By following the product selection process outlined in our catalog, you will determine and apply the Service Factors to compensate for severe operating conditions.

The Taper-Grip® bushing is integral to the Cyclo® HBB and provides for easy mounting and removal to and from the shaft of the driven machine.  Because it requires no keyway, the shaft isn't weakened and maximum torque is transmitted.  With the added strength of steel, the Taper-Grip® bushing can be used in reversing and/or high start-up applications.  The steel Taper-Grip® bushing can be used on all 
Taper-Grip® products.

The Cyclo® speed reducer, by virtue of its smooth, almost frictionless operation (unlike traditional helical gears), has a thermal rating that far exceeds its mechanical capacity and all but eliminates the conventional limitations due to heat.

The standard torque arm assembly is shown in the Dmensions section of our catalog.  The torque arm should be mounted at 90 degrees to a line from the point of attachment to the reducer and the center of the output bore with up to 30 degrees plus or minus variance.  It should always be mounted in tension, not compression.  A bracket type torque arm is also offered as a non-stock option.

Selection is based on the actual horsepower and/or torque requirements at the output shaft.  The Cyclo® HBB speed reducer has particularly high efficiencies over a wide range of reduction ratios, which frequently permits the use of reduced input power requirements (smaller HP motor) without sacrificing output shaft torque.  The selection procedures in our catalog will guide you in choosing the most efficient reducer for your application.

Emergency 24h Contact


In case of after hours service emergency, please contact the number above.

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