DRIVE FOR MOTOR-DRIVEN BICYCLE

摘要

PROBLEM TO BE SOLVED: To miniaturize a drive by using a magnetostriction type torque sensor while avoiding interference between a one-way clutch and a motor which are arranged at a human-powered drive system. SOLUTION: The drive is provided with a cylindrical detection spindle 21 through which a pedal crank shaft 6 is penetrated and which transmits stepping force from one end part to the other end part. Then the drive is provided with an energized coil 28 arranged on the outer peripheral side of the detection spindle 21, and the non-contact magnetostriction type torque sensor 25 having a detection coil 29 and the detection spindle 21. An output spindle 10 having a sprocket 8 is supported with flexible rotation on the same side part as a chain 9 in the vehicle width direction by a drive housing 14. The one end part of the output spindle 10 on the opposite side of the chain 9 in the vehicle width direction is connected to the other end part of the detection spindle 21 through the one-way clutch 22. A motor 11 for driving a rear wheel is arranged at the drive housing 14 so that an axis becomes in parallel with the pedal crank shaft 6. The stator 33 of the motor 11 is positioned at one side part on the opposite side of the chain 9 in the vehicle width direction. Then the one-way clutch 22 is positioned on the opposite side of the stator 33 in the vehicle width direction. COPYRIGHT: (C)2005,JPO&NCIPI