A dual-overrunning clutch shaft sleeve output adaptive automatic transmission main shaft assembly, a gearbox, and a drive system, comprising a main shaft (1), and a transmission system and a power output sleeve on the main shaft (1), the transmission system comprising a low-speed gear power input member, a reverse gear power input member, and an adaptive transmission assembly; the reverse gear power input member has a transmission ratio I and the low-speed gear power input member has a transmission ratio II, transmission ratio I being greater than or equal to transmission ratio II; using the rational engagement of two overrunning clutches, the transmission ratios of the reverse gear structure and the low-speed gear mechanism are set rationally so that the entire structure is simple and compact and interference does not occur, ensuring overall performance and transmission stability; using the output power of the shaft sleeve, the output part can be selected according to requirements, being applicable to the field of electric vehicles and also applicable to the field of other variable torque mechanical transmissions; in addition, the shaft sleeve output can also ensure a large output torque.
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