An eight-speed dual-clutch automatic transmission

Abstract

The invention discloses an eight-speed dual-clutch automatic transmission, which comprises first and second input shafts sleeved together, first and second output shafts parallel to the first and second input shafts, and first and second The automatic clutch is fixed with the third and fifth gears and the seventh gear on the first input shaft, and the fourth and sixth gears and the second reverse gear are fixed on the second input shaft. There are 2nd, 3rd and 4th gear driven gears, the 5th and 6th gear driven gears are set on the second output shaft, the reverse gear driven gear meshed with the 2nd gear driven gear, and the 4th gear driven gear is set There is a fourth-speed driven gear synchronizer that can be engaged with the third-speed driven gear, and a sixth-speed driven gear synchronizer that can be engaged with the fifth-speed driven gear is provided on the sixth-speed driven gear. The six-speed driving gear can be used to transmit the power of the first and eighth gears. The invention has short axial length and compact structure, is suitable for front-drive cars, and is arranged conveniently.

Description

technical field [0001] The invention relates to a transmission for vehicles, in particular to an eight-speed dual-clutch automatic transmission suitable for front-drive cars. Background technique [0002] With the development of the automobile industry, the dual-clutch automatic transmission with high efficiency and high comfort has gradually become a development trend. The existing eight-speed dual-clutch automatic transmission integrates two gearboxes and two clutches into one gearbox, and two rotatably nested input shafts are connected to one of the clutches respectively, and the two input shafts The shafts respectively transmit the power of the two transmission speed groups, and the shifting procedure is completed by automatically switching between the two clutches, so that the power shifting during the shifting process can be realized, that is, the power is not interrupted during the shifting process, and the engine's The power can always be transmitted to the wheels, ...

AI Technical Summary

Problems solved by technology

[0004] The length of the gearbox is mainly determined by the number of driving gears arranged axially on the input shaft. On the one hand, since the highest and lowest two gears in this type of eight-speed dual-clutch automatic transmission are all using a first-stage gear pair, And through a synchronizer for power transmission, therefore, the power of the engine is transmitted to a driven gear on one of the output shafts through a driving gear on one of the input shafts, and then a synchronizer is used to make the corresponding The output shaft rotates synchronously with the driven gear and outputs power accordingly. The driving gear corresponding to the highest and lowest gears of the transmission is simply used for power transmission of one gear, which is not conducive to reducing the number of driving gears

Secondly, because most of the remaining driving gears on the input shaft are simply meshed with two driven gears on the first output shaft and the second output shaft at the same time and directly output power, that is to say, each gear is It is directly transmitted to the output shaft through the synchronizer of the corresponding gear through a simple one-stage transmission between the driving gear on the input shaft and a driven gear on the output shaft. Therefore, a driving gear can only be used at the same time at most. Based on the power transmission of two gears, the number of driving gears needs to be maintained at least six, so that the axial dimension of the entire transmission is still relatively long, so that its layout on front-wheel-drive cars is limited to a certain extent, and Not conducive to the lightweight of the car

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