A seven-speed planetary transmission for automatic transmission

Abstract

The invention provides a seven-gear planetary transmission for an automatic transmission case. The seven-gear planetary transmission comprises four planetary rows, five transmission components, four brakes, two clutches, an input component and an output component; the planetary row I is respectively connected with the input component, the transmission component I and the transmission component II; the planetary row II is respectively connected with the input component, the transmission component I and the transmission component V; the planetary row III is respectively connected with the transmission component V, the transmission component III and the output component; the planetary row IV is respectively connected with the transmission component III, the output component and the transmission component IV; the brakes I, II, III and IV are respectively used for braking the transmission components II, I, III and IV; the clutch I is respectively connected with the input component and the transmission component III; the clutch II is respectively connected with the input component and the transmission component I. Compared with the prior art, the transmission provided by the invention has the benefits that the switch among gears can be realized only through changing one operation part, so that a shifting operation system is simple and reliable; the size and weight of the transmission case are reduced.

Description

technical field [0001] The invention relates to a transmission, in particular to a seven-speed planetary transmission for an automatic transmission. Background technique [0002] Automobile transmission is a set of transmission devices used to coordinate the engine speed and the actual driving speed of the wheels, and is used to exert the best performance of the engine. The transmission can generate different gear ratios between the engine and the wheels during the running of the car, and the engine can work at its best power performance state through gear shifting. The development trend of the transmission is more and more complicated, and the degree of automation is getting higher and higher, and the automatic transmission will be the mainstream in the future. [0003] The speed change mechanism of the automatic transmission changes the speed and torque output by the hydraulic torque converter, and outputs the changed speed and torque through the output shaft to meet actu...

AI Technical Summary

Problems solved by technology

[0004] In addition, the manipulation of the multi-degree-of-freedom planetary transmission is a difficult problem. The multi-degree-of-freedom planetary transmission needs to manipulate multiple control parts for each gear. The road is complex, which affects the stability and service life of the gearbox

[0005] However, when the transmission ratio series is determined, the selection of a good transmission diagram is an important and complicated task. The reason why it is important is that the efficiency, size and reliability of the transmission are largely determined by the transmission diagram. , the reason why it is complicated is that a multi-degree-of-freedom planetary transmission that requires gears is composed of multiple planetary mechanisms, and the number of possible solutions is huge. How to find a solution that meets the requirements from a large number of possible solutions has been a difficult problem for many years

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