SPEED REDUCER, DRIVING SYSTEM OF ELECTRIC VEHICLE, AND ELECTRIC VEHICLE

摘要

A speed reducer (100), a driving system of an electric vehicle, and the electric vehicle. The speed reducer (100) comprises a motor input shaft (1a), an engine input shaft (1b), an intermediate shaft (2), a first output shaft (3a), a second output shaft (3b), and a differential mechanism (4), and the first output shaft (3a) and the second output shaft (3b) are respectively in transmission connection with the differential mechanism (4). The speed reducer further comprises: a first transmission assembly (X1) used for connecting power transmission between the motor input shaft (1a) and the intermediate shaft (2); a second transmission assembly (X2) used for connecting or disconnecting power transmission between the engine input shaft (1b) and the intermediate shaft (2); and a third transmission assembly (X3) used for connecting or disconnecting power transmission between the intermediate shaft (2) and the differential mechanism (4). The speed reducer can solve the problem that an engine and a generator in an existing series-connection extended-range electric vehicle cannot directly drive the vehicle, so that the dynamic property, economy, and controllability of the whole vehicle are improved.