Patent ID: 10520064

Abstract:
A dual-clutch automatic transmission having seven forward gears and one reverse gear, wherein a seventh-gear driving gearwheel, a first-gear driving gearwheel, a fifth-gear driving gearwheel and a third-gear driving gearwheel are individually and fixedly arranged on a first input shaft, a fourth-gear driving gearwheel and a second-gear driving gearwheel are individually and fixedly arranged on a second input shaft, driven gearwheels respectively and correspondingly engaged with the driving gearwheels are rotatably supported on the first output shaft and the second output shaft. The fourth-gear driving gearwheel is also used as a sixth-gear driving gearwheel, and the gear sets of other gears are not shared, which is conducive to decrease the overall axial length of the transmission, facilitates full vehicle arrangement, and prevents the speed ratio ranges of other gears from being influenced by sharing of these gear sets to adapt to more vehicle models. In addition, the arrangement of a parking ratchet wheel is optimized in the present invention, the stress distribution on the output shafts can be more even, and thus the stability is improved and the service life is prolonged.