To obtain an outer box capable of being compact in size and light in weight at low costs for the outer box of a drive mechanism and preventing noises and vibration and reducing frictional wear in the parallel biaxial drive mechanism interposing both sides of a tire of an electrically-assisted bicycle and an electrically-powered wheelchair between two driving rollers arranged on two parallel shafts and driving a shaft of the driving rollers by frictional force produced with wedge action of an intermediate roller.
A material extruded in a perpendicular direction on a plane including an input shaft and an output shaft in the outer box of the drive mechanism is cut on the plane parallel to the input shaft and the output shaft. Upon setting the outer face and cut face of the extruded material as a processing datum plane, an axial play of the intermediate roller is lessened with the precision of an inner face of the extruded material.
NAITO TAKAO
OGOSHI HIDEO
Next Patent: INTERMEDIATE ROLLER SUPPORTING SHAFT OF PARALLEL BIAXIAL DRIVE MECHANISM