Multi-gear automatic transmission

Abstract

The invention discloses a multi-gear automatic transmission, and belongs to the technical field of automatic transmissions. The problems that in an existing automatic transmission technology, the number of members is large, the structure is complex, and particularly it is difficult to provide a transmission ratio series which is slightly progressive and well graded and good in meshing efficiency are solved. The multi-gear automatic transmission comprises a first planet wheel set, a second planet wheel set, a third planet wheel set and a fourth planet wheel set and six gear shift switching elements, wherein the first planet wheel set, the second planet wheel set, the third planet wheel set and the fourth planet wheel set are sequentially arranged along a main rotating shaft front and back, and the gear shift switching elements are allowed to be selectively operated to form nine forward gears and one reverse gear between an input shaft and an output shaft of the transmission; the input shaft and a fourth shaft are connected through a first clutch in the mode of being capable of loosening, the fourth shaft is connected with a first sun wheel and a second sun wheel, the fourth shaft and a third shaft are connected through a second clutch in the mode of being capable of loosening, the third shaft is connected with a first planet rack and connected to a shell through a first brake, and the input shaft and a fifth shaft are connected through a third clutch in the mode of being capable of loosening.

Description

technical field [0001] The invention belongs to the technical field of automatic transmissions, and relates to an automatic transmission unit, in particular to a power transmission system for motor vehicles, in particular to a multi-speed automatic transmission. Background technique [0002] The powertrain of a motor vehicle consists of an engine, a multi-speed transmission, and a differential or final drive. A multi-speed transmission increases the overall operating range of the vehicle by allowing the engine to be operated multiple times through its torque range. The number of forward speed ratios (forward gears) available in the transmission determines the number of times the engine torque range is repeated. A low number of forward gears limits the overall speed range of the vehicle and thus requires a relatively large engine to produce a wide speed and torque range. [0003] At present, the four-speed automatic transmission, especially the automatic transmission with p...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the existing problems in the prior art, such as the relatively large number of components and the complex structure, especially the difficulty in providing slightly progressive, well-graded transmission ratio series and good meshing efficiency, and provides multi-speed Automatic Transmission

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