Gear Change Support

gear_change_support_3

SHIMANO gear change support mechanism utilizes some portion of pedaling force at down shifting. The result is a quick and precise downshift with very light feeling. For the automatic shifting system, this gear change support mechanism is the key. Shifting effort is reduced to the point where the hub can be shifted through a small low-torque DC motor. Less electricity is required, so a smaller battery allows the system to be lighter and more compact.

40% less shifting force required
Pedaling force is applied against the sleeve to help overcome sleeve return pressure and execute the shift.
GCS
Shifting torque
Driver rotation torque
GCS01
Sun gear
Shifting Pawl
Sleeve
PAWL STUCK
GCS02
Sleeve
SUPPORT PAWL ACTIVATED
GCS03
Sleeve
SUPPORT PAWL
TURNS SLEEVE
GCS04
Sun gear
Shifting Pawl
Sleeve
SLEEVE PUSHES
PAWL BACK