Electric drive for bicycles

摘要

The invention relates to an electric drive for bicycles, comprising two symmetrically arranged external-rotor type counter-rotating motors which are fed via two separate motor actuators/regulators that obtain the same control signal for power regulation purposes. The motors are mounted in an oscillating manner about an axis which is parallel, in particular substantially parallel, to the motor axis but offset with respect to the motor axis in a lateral manner, in particular in a parallel manner.

主权项

1. A drive for a bicycle adapted to move in a travel direction and having a frame and a wheel rotatable about a wheel axis on the frame and having a rim and a tire on the rim, the drive comprising:
two symmetrically arranged counter-rotating motors flanking the wheel and each having an external rotor that rotates an elastic friction ring engageable with a respective flank of the rim about a respective motor axis; respective mounts secured to the frame and each carrying a respective one of the motors for pivoting of the motors about swing axes spaced rearwardly in the direction from and generally parallel to the respective motor axes, each motor axis and the respective swing axis forming a plane extending at an angle of less than 45° to the wheel axis such that the ring presses against the rim with a force Fa greater than a transmitted force Fu.