Right Angle Spiral Bevel Speed Reducers with Cyclo® or Planetary Reducer Inputs


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The rugged, all-steel Cyclo® BBB4 is designed for reliability, efficiency, and longer life. The Cyclo® or planetary inputs deliver greater performance with less wear than conventional gear designs, and the series delivers increased power ratings, higher torque, and a wider selection of shaft diameters. Also available are 46 new standard ratios and 87 optional ratios.

New features of the Cyclo® BBB4 Series:

  • 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
Frame Size Power  Bore Range 
Max Torque
lb·in (N·m)		 Max Motor Power
HP (kW)		 Taper Grip Bushing
inch (mm)		  Keyed Hollow Shaft
inch (mm)		 Shrink Disc
(mm)		 Solid Shaft
inch (mm)
 Size A*   9,470(1,070)  25  (20)   1 to 2-1/4 (23-55) (55)   1-1/4 to 2-3/16  (45 to 55)   2 (55)
 Size B* 18,851(2,130) 40 (29) 1-1/8 to 2-3/4(30-65) (65) 1-3/8 to 2-5/8  (55 to 65) 2- 7/8(65)
 Size C* 37,701(4,260) 60   (45) 1-1/2 to 3 (40-75)  (75) 2-3/16 to 3-3/16   (60 to 80) 3- 1/8(75)
 Size D* 77,172(8,720) 80  (60) 2-3/16 to 3-7/16 (55-85) (85) 2-3/8 to 3-3/4  (70 to 90) 3- 5/8(85)
 Size E*   102,660(11,600)  100  (75)  2-11/16 to 4(65-100)  (100)   2- 15/16 to 4(80 to 110)   4- 7/16(100)
 NEW Size F 153,990(17,400) 100  (75) 3-15/16 to 4- 15/16 (100-120) (120) 3- 7/16 to 4- 3/4 (80 to 120) 4-3/4(120)

*Cyclo® BBB4 Frame Sizes A-E are dimensionally identical to the Cyclo® BBB3

For more information, see our feature on the special features from Sumitomo or contact us at AutomatedPT.