Drive unit for electric bicycle e.g. mountain bicycle, has electric motor and battery that are provided on base portion, and bicycle frame which is supported on base portion

摘要

The drive unit (20) has an electric motor (100) and a battery (50) which are provided on cast metal base portion (21). The bicycle frame (16) is supported on the base portion provided with lower tube portion (22). The lower tube portion is connected with the bottom bracket (24). The lower tube portion is provided with a recess (72) for releasably receiving the battery. An independent claim is included for bicycle frame.