A nine-speed automatic transmission with two-shaft structure

Abstract

The invention discloses a nine-speed automatic transmission with double-shaft structure, which includes a casing, an input member and an output member, four planetary gear sets, three fixed-shaft gear sets, shifting elements, and eleven interconnecting members. The transmission of the present invention locks three shifting elements at the same time to obtain the corresponding gears, realizes nine forward gear ratios and one reverse gear, and the shifting between adjacent gears all satisfies the simple shifting of only one shifting element required for smooth shifting. The present invention can obtain nine forward gear ratios. After the number of gears in the transmission system is increased, the probability of the engine working under economic conditions is increased, the engine utilization rate is high, the reserve power is large, and the power performance and fuel economy are good; Reduce the jump of the transmission ratio between adjacent gears, which is beneficial to reduce the impact of shifting and improve ride comfort; at the same time, it has a lower speed and torque, which is beneficial to reduce the wear between the meshing components and reduce the wear and tear of the components. And the design size of the device to further reduce the manufacturing cost.

Description

technical field [0001] The invention belongs to the technical field of vehicle transmissions, in particular to a nine-speed automatic transmission with a biaxial structure. Background technique [0002] The number of gears of the automatic transmission has a very important impact on the power and economy of the car. When the number of transmission gears increases, the chances of the engine working close to the maximum power condition increase. Therefore, the power utilization rate of the engine is high, and the reserve power will also increase. This is beneficial for the car to accelerate and go uphill, and improves the power and economy of the car when it is running at a medium speed. However, when the number of gears is more than five gears, the number of planetary rows and the number of control elements (clutches and brakes) in the automatic transmission will also increase, which will make the structure and operation of the transmission very complicated. Therefore, vari...

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