Freewheel Clutch

This is a "one-way clutch" that is installed in the e-bike assist unit in order to connect and disconnect the motor's assist force.
By providing the optimum specifications for each unit in a diverse lineup, the clutch contributes to the improvement of ride quality by virtue of its compact package size and light weight. It therefore allows a smaller drive unit to transmit the proper amount of assist force with high precision.

Line up

Cam & Roller Type (Radial load resistance)

  • With bearing function (radial load resistance)
    → Contributes to downsizing and weight reduction of the unit
  • Cams share the load evenly
    → Transmits assist force with high precision
  • Concentric retainer structure
    → Reduced frictional torque in idle rotation contributes to quieter operation and improved ride quality

Camcage Type

  • Superior torque transmission performance (based on our comparison test)
    → Contributes to downsizing and weight reduction of the drive unit
  • Cams share the load evenly
    → Transmits assist force with high precision

Built-in Bearing Type

  • All-in-one (inner/outer ring, cam, bearing)
    → Contributes to downsizing/weight reduction of units
  • Cams share the load evenly
    → Transmits assist force with high precision
  • Concentric retainer structure
    → Reduced frictional torque in idle rotation contributes to quieter operation and improved ride quality

Cam & Roller Type (Axial and radial load resistance) Under development

  • Bearing function included (axial and radial load resistance)
    → Can be used with helical gears, contributing to further downsizing and weight reduction of the unit
  • Cams share the load evenly
    → Transmits assist force with high precision.
  • Concentric retainer structure
    → Reduced frictional torque in idle rotation contributes to quieter operation and improved ride quality

Torque Transmission Capacity/Dimensions

Cam & Roller Type
(Radial load resistance)
Model No. Allowable Torque A B C D E
Nm Inner ring I.D Inner ring raceway diameter Outer ring raceway diameter Outer ring O.D Width
CC104R4-15-8.5 7 - 15 23.294 - 9
CC104R4-15-10.5 9 - 15 23.294 - 11
CC104R4-15-14.5 14 - 15 23.294 - 15
CC110R5-25-8.5 29 - 25 33.294 - 9
CC110R5-25-10.5 39 - 25 33.294 - 11
CC110R5-25-14.5 59 - 25 33.294 - 15
CC116R4-35-8.5 105 - 35 43.294 - 9
CC116R4-35-10.5 147 - 35 43.294 - 11
CC116R4-35-14.5 232 - 35 43.294 - 15
CC120R4-45-8.5 207 - 45 53.294 - 9
CC120R4-45-10.5 276 - 45 53.294 - 11
CC120R4-45-14.5 427 - 45 53.294 - 15
Camcage Type
Model No. Allowable Torque A B C D E
Nm Inner ring I.D Inner ring raceway diameter Outer ring raceway diameter Outer ring O.D Width
BB101815 44 - 15 23 - 12
BB102625 133 - 25 33 - 12
BB103635 285 - 35 43 - 12
BB104445 482 - 45 53 - 12
Built-in Bearing Type
Model No. Allowable Torque A. Inner ring I.D D. Outer ring O.D E. Width
Nm mm mm mm
BB15 29 15 35 11
BB17 43 17 40 12
BB20 61 20 47 14
BB25 78 25 52 15
BB30 140 30 62 16
BB35 173 35 72 17
BB40 260 40 80 22

*1. The above values are for reference only (Tsubaki will optimize the design according to the customer's requirements/applications).

*2. Cam & roller (axial and radial load bearing) type is under development and the dimension table will be updated separately.

Toward a Sustainable Society

The Tsubaki Group is engaged in the “art of moving” and aims to provide value that exceeds expectations
to become a company that continues to be needed by society.