US 12,434,786 B2
Electric assist device for a bicycle
Jean-Pierre Mercat, Chavanod (FR)
Assigned to MAVIC GROUP, Chavanod (FR)
Appl. No. 17/294,245
Filed by MAVIC GROUP, Chavanod (FR)
PCT Filed Nov. 14, 2019, PCT No. PCT/FR2019/000186
§ 371(c)(1), (2) Date May 14, 2021,
PCT Pub. No. WO2020/099737, PCT Pub. Date May 22, 2020.
Claims priority of application No. 18 71997 (FR), filed on Nov. 15, 2018.
Prior Publication US 2022/0001956 A1, Jan. 6, 2022
Int. Cl. B62M 6/55 (2010.01); B62J 45/20 (2020.01); B62J 45/411 (2020.01); B62M 6/50 (2010.01); B62M 6/90 (2010.01); B62M 11/02 (2006.01); F16D 41/30 (2006.01); F16D 43/22 (2006.01)
CPC B62M 6/55 (2013.01) [B62J 45/20 (2020.02); B62J 45/411 (2020.02); B62M 6/50 (2013.01); B62M 11/02 (2013.01); F16D 41/30 (2013.01); F16D 43/22 (2013.01); B62M 6/90 (2013.01)] 17 Claims
OG exemplary drawing
 
1. An electric assist device for a bicycle comprising:
a shaft secured in rotation with a pair of cranks and configured to be driven in rotation in a positive direction by an electric motor; and
a connection mechanism between the motor and the shaft, the connection mechanism comprising either a declutchable freewheel or a freewheel and a clutch so that the connection mechanism has at least three distinct states:
state 1, called assist state, in which the motor transmits a torque to the shaft via a driving piece which turns at a same speed as the shaft,
state 2, called free-wheel state, in which the rotation of the shaft in the positive direction is greater than that of the driving piece, and
state 3, called disconnection state, in which a rotation in the positive direction of the shaft cannot drive the rotation of the motor and a rotation in a negative direction of the shaft cannot drive the rotation of the motor.