Cyclo® Bevel Buddybox® 4 Series Reducer

Right-Angle Spiral-Bevel Reducers with Cyclo® Input

Robust, state-of-the-art, spiral-bevel reducers. 

  • All-Steel Internal Components
  • Highly Efficient
  • Standard Ductile-Iron Housing
  • Integrated-Cycloidal Technology
  • Maintenance-Free Options Available



Input Quill and C-face adapter
Output Shrink Disc, Taper-Grip® Bushing, Solid Shaft, Keyed Hollow Bore, Screw Conveyor
Mounting Hollow Shaft, Foot, Flange, U-Face (direct surface mount)
Sizes 6 frame sizes (A-F), 48 to 1059 kg
Ratios 11:1 to 26,000:1 and greater
Power Range 1/8 to 100HP (0.10kW to 75kW)
Torque Capacity Up to 159,313 lb-in (18,000 Nm)
Motor Standards NEMA, IEC, JIS, UL, CSA, CE

Cyclo® BBB4

The Cyclo® BBB4 combines the strength and flexibility of the Cyclo® gear reducer and a single-stage right-angle spiral-bevel gearbox in a rugged right-angle gearbox design. With a 24-month warranty, regardless of hours of operation, the Cyclo® BBB4 is an excellent choice for applications in material handling, asphalt mixers, specialty machine industries, conveyors, and other applications requiring right-angle speed reducers.

Rendered exploded view of BBB4 reducer

Key Facts

Torque Capacity
Max Rating


Taper Grip® Bushing System

The keyless Taper-Grip® bushing system provides simple and reliable installation without the need for a custom shaft.

Ductile Iron Housing

New ductile-iron housing is twice as strong as cast iron, making it one of the most rugged bevel gearboxes available

Increased Overhung Load Capacity

Cyclo® BBB4 has over 375% overhung load capacity than previous models

Increased Ratings

The newly designed Cyclo® BBB4 series has been optimized for increased power ratings over the previous generations

New Larger Size

New F Size yields higher torque and can accommodate larger shaft diameters

New Ratios Available

46 standard and 87 optional ratios added

Unified Lubrication System

Single oil-bath lubrication system for easy maintenance and higher performance.

Compact Design

The most torque-dense right-angle gearbox design available in the industry. The new ductile-iron housing allows for higher radial load in a small, compact design.

Optional Taconite Seal System

Heavy-duty, fortified, grease purgeable system withstands the most demanding applications.

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Do you have questions about the Cyclo® BBB4? 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.

The standard ratings for Cyclo® BBB4 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 the severe operating conditions.

Cyclo® BBB4 Speed Reducers provide 300% momentary intermittent shock load capacity. For applications with shock loads greater than 300%, consult a Sumitomo Application Engineer.

The standard torque arm assembly supplied is a turnbuckle type as shown in 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. A bracket type torque arm is also offered as a non-stock option. In addition, we provide the Banjo-type and T-type torque arm mounting configurations.

With an increased torque capacity, the new Steel Taper-Grip® bushing can be used in reversing and/or high start-up applications. The new Steel Taper-Grip®bushing can be used on all Taper-Grip® products.

The mounting positions for the Cyclo® BBB4 detail the position of the unit relative to the driven shaft. The mounting position effects how the unit is assembled and maintained (i.e., location of oil fill ports, type of lubrication, breather location, etc.). You must specify the mounting position at the time of order.

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 Taper-Grip® bushing is integral to the Cyclo® BBB4 and provides for easy mounting and removal to and from the shaft of the driven machine.  Because it requires no key way, the shaft isn’t weakened and maximum torque is transmitted.

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.

Visit our Cyclo® BBB4 Product Configurator to find the exact match for your applications.

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), and three AGMA load classifications for gearmotors: III, and III. 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.

Emergency After-Hours Support


Sumitomo’s Product Support offers scheduled repair services as a one-stop-shop for all your related gearbox needs. For emergency repairs, we offer repair services 24 hours a day, 7 days a week.

Cyclo and Spur Gear

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