Patent ID: 8205705
Filing Date: 2012-06-26
Classification: B60L,B62M,Y02T

Abstract:
1. A middle electric motor drive unit for an electric bicycle having a pedal shaft and a frame, comprising a motor having a motor shaft; a controller; a sensor; a gear reducer comprising a reduction gear and a drive gear engaged with each other; a tension gear support; a chain tension gear; and a housing; an output draft; an output-draft bearing; wherein said middle electric motor drive unit is disposed below said frame, and is disposed beside said pedal shaft; said middle electric motor drive unit is independent from said pedal shaft with respect to functions and structure; said motor is an internal rotor and permanent magnet DC motor; said motor is disposed in said housing; said output shaft is disposed in said housing via said bearing; said motor shaft is parallel to said output shaft and said pedal shaft; said controller is built-in, and disposed in or on said housing; said reduction gear is disposed on said output shaft; said drive shaft is disposed on an end of said motor shaft; and said sensor is an internal sensor having two axes, wherein angle between one of said two axes and a horizontal plane is +45°, and angle between the other of said two axes and said horizontal plane is −45°.