| 摘要 |
A bicycle drive unit is disclosed that includes a case frame, crank shaft, front sprocket, rear hub shaft and rear sprocket. The crank shaft includes first and second support portions that are spaced apart from one another and are supported on opposite lateral sides of a forward portion of the case frame. The first and second support portions are engaged with bearings supported on opposite sides of the interior of the case frame. The front sprocket is installed on the crank shaft within the case frame and between the first and second support portions. The rear hub shaft includes a third and fourth supporting portions that are spaced apart from one another with the rear sprocket installed on the rear hub shaft therebetween.
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