传动机构采用自动离心离合器、无级变速系统。
Its transmission system USES auto centrifugal clutch and stepless speed changing system.
主要零件的计算、驱动装置的选择传动机构的设计。
Major parts, drive transmission mechanism of the choice of design.
你要找的是电磁体（螺线管），在传动机构中驱动第一齿轮。
What you're looking for is the electromagnet (solenoid). which turns the first gear in the gear train.
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