Patent ID: 11912374
Assignee: SRAM, LLC
Field: Transport (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A front shifting system for a bicycle, the front shifting system comprising:
a shifter mountable on a bicycle, the shifter operable to transmit a wireless signal;
a crank assembly configured to include two crank arms and a pedal associated with each of the two crank arms, the crank assembly rotatable about a rotation axis;
a chain; and
a front shift unit coupled to the crank assembly and rotatable about the rotation axis, the front shift unit including
a chain ring component with a big chain ring and a small chain ring, the small chain ring having a small diameter and the big chain ring having a big diameter that is larger than the small diameter, and
a shift mechanism coupled to and rotatable with the chain ring component about the rotation axis, the shift mechanism configured to receive the wireless signal from the shifter and to shift the chain between the big chain ring and the small chain ring according to the wireless signal,
wherein the shift mechanism includes an electronic control unit, a gearmotor unit in communication with the electronic control unit, at least one upshift element coupled to the gearmotor unit, at least one downshift element coupled to the gearmotor unit, and a battery arranged to provide power for the electronic control unit and the gearmotor unit to operate the at least one upshift element and the at least one downshift element, and
wherein the at least one downshift element includes a first downshift element and a second downshift element positioned opposite the first downshift element around a circumference of the chain ring component.